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TPS76901, TPS76912, TPS76915, TPS76918, TPS76925 TPS76927, TPS76928, TPS76930, TPS76933, TPS76950 ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL

2000

D D D D D D D D

100-mA Low-Dropout Regulator Available in 1.2-V, 1.5-V, 1.8-V, 2.5-V, 2.7-V, 2.8-V, 3.0-V, 3.3-V, and 5-V Fixed-Output and Adjustable Versions Only 17 ?A Quiescent Current at 100 mA 1 ?A Quiescent Current in Standby Mode Dropout Voltage Typically 71 mV at 100mA Over Current Limitation –40°C to 125°C Operating Junction Temperature Range 5-Pin SOT-23 (DBV) Package
22 21 20 19 18

DBV PACKAGE (TOP VIEW) IN GND EN 1 2 3 4 NC/FB 5 OUT

TPS76933

GROUND CURRENT vs FREE-AIR TEMPERATURE
VI = 4.3 V CO = 4.7 ?F

description
The TPS769xx family of low-dropout (LDO) voltage regulators offers the benefits of low dropout voltage, ultralow-power operation, and miniaturized packaging. These regulators feature low dropout voltages and ultralow quiescent current compared to conventional LDO regulators. Offered in a 5-terminal small outline integrated-circuit SOT-23 package, the TPS769xx series devices are ideal for micropower operations and where board space is at a premium.

Ground Current – ? A

IO = 100 mA

IO = 0 mA 17

A combination of new circuit design and process 16 innovation has enabled the usual PNP pass transistor to be replaced by a PMOS pass 15 element. Because the PMOS pass element –60 –40 –20 0 20 40 60 80 100 120 140 behaves as a low-value resistor, the dropout TA – Free-Air Temperature – °C voltage is very low, typically 71 mV at 100 mA of load current (TPS76950), and is directly proportional to the load current. Since the PMOS pass element is a voltage-driven device, the quiescent current is ultralow (28 ?A maximum) and is stable over the entire range of output load current (0 mA to 100 mA). Intended for use in portable systems such as laptops and cellular phones, the ultralow-dropout voltage feature and ultralow-power operation result in a significant increase in system battery operating life. The TPS769xx also features a logic-enabled sleep mode to shut down the regulator, reducing quiescent current to 1 ?A typical at TJ = 25°C. The TPS769xx is offered in 1.2-V, 1.5-V, 1.8-V, 2.5-V, 2.7-V, 2.8-V, 3.0-V, 3.3-V, and 5-V fixed-voltage versions and in a variable version (programmable over the range of 1.2 V to 5.5 V).

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

Copyright ? 2000, Texas Instruments Incorporated

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1

TPS76901, TPS76912, TPS76915, TPS76918, TPS76925 TPS76927, TPS76928, TPS76930, TPS76933, TPS76950 ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000

AVAILABLE OPTIONS TJ VOLTAGE Variable 1.2V to 5.5V 1.2 V 1.5 V 1.8 V –40°C to 125°C 2.5 V 2.7 V 2.8 V 3.0 V 3.3 V 5.0 V ? The DBVT indicates tape and reel of 250 parts. ? The DBVR indicates tape and reel of 3000 parts. SO SOT-23 (DBV) PACKAGE PART NUMBER TPS76901DBVT? TPS76912DBVT? TPS76915DBVT? TPS76918DBVT? TPS76925DBVT? TPS76927DBVT? TPS76928DBVT? TPS76930DBVT? TPS76933DBVT? TPS76950DBVT? TPS76901DBVR? TPS76912DBVR? TPS76915DBVR? TPS76918DBVR? TPS76925DBVR? TPS76927DBVR? TPS76928DBVR? TPS76930DBVR? TPS76933DBVR? TPS76950DBVR? SYMBOL PCFI PCGI PCHI PCII PCJI PCKI PCLI PCMI PCNI PCOI

functional block diagram
TPS76901

IN EN Current Limit / Thermal Protection

OUT

VREF GND

FB

TPS76912/15/18/25/27/28/30/33/50

IN EN Current Limit / Thermal Protection

OUT

VREF GND

2

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TPS76901, TPS76912, TPS76915, TPS76918, TPS76925 TPS76927, TPS76928, TPS76930, TPS76933, TPS76950 ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000

Terminal Functions
TERMINAL NAME GND EN FB IN NC OUT NO. 2 3 4 1 4 5 O I I I I/O Ground Enable input Feedback voltage (TPS76901 only) Input supply voltage No connection (Fixed options only) Regulated output voltage DESCRIPTION

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)?
Input voltage range (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.3 V to 13.5 V Voltage range at EN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to VI + 0.3 V Voltage on OUT, FB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Peak output current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally limited ESD rating, HBM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 kV Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table Operating virtual junction temperature range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 40°C to 150°C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C
? Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTE 1: All voltage values are with respect to network ground terminal. DISSIPATION RATING TABLE PACKAGE Recommended Absolute Maximum DBV DBV TA ≤ 25°C POWER RATING 350 mW 437 mW DERATING FACTOR ABOVE TA = 25°C 3.5 mW/°C 3.5 mW/°C TA = 70°C POWER RATING 192 mW 280 mW TA = 85°C POWER RATING 140 mW 227 mW

recommended operating conditions
MIN Input voltage, VI (see Note 2) Output voltage range, VO Continuous output current, IO (see Note 3) Operating junction temperature, TJ 2.7 1.2 0 –40 NOM MAX 10 5.5 100 125 UNIT V V mA °C

NOTES: 2. To calculate the minimum input voltage for your maximum output current, use the following formula: VI(min) = VO(max) + VDO (max load) 3. Continuous output current and operating junction temperature are limited by internal protection circuitry, but it is not recommended that the device operate under conditions beyond those specified in this table for extended periods of time.

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TPS76901, TPS76912, TPS76915, TPS76918, TPS76925 TPS76927, TPS76928, TPS76930, TPS76933, TPS76950 ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000

electrical characteristics over recommended operating free-air temperature range, VI = VO(typ) + 1 V, IO = 100 mA, EN = 0 V, CO = 4.7 ?F (unless otherwise noted)
PARAMETER TPS76901 TPS76912 TPS76915 TPS76918 TPS76925 TPS76927 TPS76928 TPS76930 TPS76933 TPS76950 TEST CONDITIONS 1.2 V ≤ VO ≤ 5.5 V, 1.2 V ≤ VO ≤ 5.5 V, TJ = 25°C, TJ = –40°C to 125°C, TJ = 25°C, TJ = –40°C to 125°C, TJ = 25°C, TJ = –40°C to 125°C, TJ = 25°C, TJ = –40°C to 125°C, TJ = 25°C, TJ = –40°C to 125°C, TJ = 25°C, TJ = –40°C to 125°C, TJ = 25°C, TJ = –40°C to 125°C, TJ = 25°C, TJ = –40°C to 125°C, TJ = 25°C, TJ = –40°C to 125°C, EN = 0V, TJ = 25°C EN = 0V, TJ = –40°C to 125°C EN = 0V, TJ = 25°C TJ = 25°C TJ = –40°C to 125°C 2.7 V < VIN < 10 V 2.7 V < VIN < 10 V 2.7 V < VIN < 10 V 2.7 V < VIN < 10 V 2.8 V < VIN < 10 V 2.8 V < VIN < 10 V 3.5 V < VIN < 10 V 3.5 V < VIN < 10 V 3.7 V < VIN < 10 V 3.7 V < VIN < 10 V 3.8 V < VIN < 10 V 3.8 V < VIN < 10 V 4.0 V < VIN < 10 V 4.0 V < VIN < 10 V 4.3 V < VIN < 10 V 4.3 V < VIN < 10 V 6.0 V < VIN < 10 V 6.0 V < VIN < 10 V 0 mA < IO < 100 mA, IO = 100 mA, IO = 0 to 100 mA, 4.850 17 ?A 28 12 0.04 %/V 0.1 190 350 1 750 ?Vrms mA ?A mV 3.201 5.0 5.150 2.910 3.3 3.399 2.716 3.0 3.090 2.619 2.8 2.884 2.425 2.7 2.781 1.746 2.5 2.575 V 1.455 1.8 1.854 1.187 1.5 1.545 MIN 0.97VO 1.224 1.261 TYP VO 1.03VO MAX UNIT

Output voltage g ( (10 ?A to 100 mA load) (see Note 4)

) Quiescent current ( (GND current) (See Note 4 and Note 5)

Load regulation

Output voltage line regulation (?VO/VO) (See Note 5)

VO + 1 V < VI ≤ 10 V, TJ = 25°C, See Note 4 VO + 1 V < VI ≤ 10 V, TJ = –40°C to 125°C, See Note 4 BW = 300 Hz to 50 kHz, CO = 10 ?F, TJ = 25°C VO = 0 V, EN = VI, See Note 4 2.7 < VI < 10 V

Output noise voltage Output current limit Standby current

TJ = –40°C to 125°C 2 ?A NOTES: 4. Minimum IN operating voltage is 2.7 V or VO(typ) + 1 V, whichever is greater. Maximum IN voltage 10 V, minimum output current 10 ?A, maximum output current 100 mA. 5. If VO ≤ 1.8 V then Vimin = 2.7 V, Vimax = 10 V: Line Reg. (mV)

+ ǒ%ńV? + ǒ%ńV?

V

O

ǒ

V

imax 100

* 2.7 V *

?

1000

If VO ≥ 2.5 V then Vimin = VO + 1 V, Vimax = 10 V: V Line Reg. (mV) O

ǒ

V

imax

ǒ

V

O

)1 V

100

??

1000

4

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TPS76901, TPS76912, TPS76915, TPS76918, TPS76925 TPS76927, TPS76928, TPS76930, TPS76933, TPS76950 ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000

electrical characteristics over recommended operating free-air temperature range, VI = VO(typ) + 1 V, IO = 100 mA, EN = 0 V, CO = 4.7 ?F (unless otherwise noted) (continued)
PARAMETER FB input current High level enable input voltage Low level enable input voltage Power supply ripple rejection Input current (EN) TEST CONDITIONS FB = 1.224 V (TPS76901) 2.7 V < VI < 10 V 2.7 V < VI < 10 V f = 1 kHz, TJ = 25°C, EN = 0 V EN = VI IO = 50 mA, IO = 50 mA, IO = 100 mA, IO = 100 mA, IO = 50 mA, IO = 50 mA, IO = 100 mA, IO = 100 mA, IO = 50 mA, IO = 50 mA, IO = 100 mA, IO = 100 mA, IO = 50 mA, IO = 50 mA, IO = 100 mA, IO = 100 mA, TJ = 25°C TJ = –40°C to 125°C TJ = 25°C TJ = –40°C to 125°C TJ = 25°C TJ = –40°C to 125°C TJ = 25°C TJ = –40°C to 125°C TJ = 25°C TJ = –40°C to 125°C TJ = 25°C TJ = –40°C to 125°C TJ = 25°C TJ = –40°C to 125°C TJ = 25°C TJ = –40°C to 125°C CO = 10 ?F, See Note 4 –1 –1 60 125 122 245 57 115 115 230 48 100 98 200 35 85 71 170 mV 60 0 1 1 MIN –1 1.7 0.9 TYP MAX 1 UNIT ?A V V dB ?A ?A

TPS76928

TPS76930 Dropout voltage (See Note 6) TPS76933

TPS76950

NOTES: 4. Minimum IN operating voltage is 2.7 V or VO(typ) + 1 V, whichever is greater. Maximum IN voltage 10 V, minimum output current 10 ?A, maximum output current 100 mA. 6. IN voltage equals VO(Typ) – 100mV; TPS76901 output voltage set to 3.3V nominal with external resistor divider. TPS76912, TPS76915, TPS76918, TPS76925, and TPS76927 dropout voltage limited by input voltage range limitations.

TYPICAL CHARACTERISTICS Table of Graphs
FIGURE VO Output voltage Ground current Output spectral noise density Zo VDO Output impedance Dropout voltage Ripple rejection LDO startup time Line transient response Load transient response Equivalent series resistance (ESR) vs Output current vs Added ceramic capacitance vs Output current vs Free-air temperature vs Free-air temperature vs Frequency vs Frequency vs Free-air temperature vs Frequency 1, 2, 3 4, 5, 6 7 8 9 10 11 12 13, 15 14, 16 17, 19 18, 20

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TPS76901, TPS76912, TPS76915, TPS76918, TPS76925 TPS76927, TPS76928, TPS76930, TPS76933, TPS76950 ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000

TYPICAL CHARACTERISTICS
TPS76925 TPS76915

OUTPUT VOLTAGE vs OUTPUT CURRENT
2.498 2.496 2.494 VO – Output Voltage – V 2.492 2.490 2.488 2.486 2.484 2.482 0 20 40 60 80 100 IO – Output Current – mA VO – Output Voltage – V VI = 3.5 V CO = 4.7 ?F TA = 25° C 1.498 1.496

OUTPUT VOLTAGE vs OUTPUT CURRENT
VI = 2.7 V CO = 4.7 ?F TA = 25° C

1.494 1.492 1.490 1.488

1.486 1.484 0 20 40 60 80 100 IO – Output Current – mA

Figure 1
TPS76933

Figure 2
TPS76915

OUTPUT VOLTAGE vs OUTPUT CURRENT
3.284 3.282 VI = 4.3 V CO = 4.7 ?F TA = 25° C VO – Output Voltage – V 1.496 1.494

OUTPUT VOLTAGE vs FREE-AIR TEMPERATURE

IO = 1 mA 1.492

VO – Output Voltage – V

3.280 3.278 3.276 3.274

VI = 2.7 V CO = 4.7 ?F

1.490 1.488 1.486 IO = 100 mA 1.484 1.482 1.480 –60 –40 –20

3.272 3.270 0 20 40 60 80 100 IO – Output Current – mA

0

20

40

60

80 100 120 140

TA – Free-Air Temperature – °C

Figure 3

Figure 4

6

POST OFFICE BOX 655303

? DALLAS, TEXAS 75265

TPS76901, TPS76912, TPS76915, TPS76918, TPS76925 TPS76927, TPS76928, TPS76930, TPS76933, TPS76950 ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000

TYPICAL CHARACTERISTICS
TPS76925 TPS76933

OUTPUT VOLTAGE vs FREE-AIR TEMPERATURE
2.496 2.494 IO = 1 mA 2.492 VO – Output Voltage – V VO – Output Voltage – V 2.490 2.488 2.486 2.484 IO = 100 mA 2.482 2.480 2.478 2.476 –60 –40 –20 0 20 VI = 3.5 V CO = 4.7 ?F 40 60 80 100 120 140 3.280 3.285

OUTPUT VOLTAGE vs FREE-AIR TEMPERATURE

IO = 1 mA

3.275

VI = 4.3 V CO = 4.7 ?F

3.270

IO = 100 mA

3.265

3.260

3.255 –60 –40 –20

0

20

40

60

80 100 120 140

TA – Free-Air Temperature – °C

TA – Free-Air Temperature – °C

Figure 5
TPS76933

Figure 6
TPS76933

GROUND CURRENT vs FREE-AIR TEMPERATURE
22 21 20 19 18 IO = 0 mA 17 16 15 –60 –40 –20 IO = 100 mA Output Spectral Noise Density – ?V Hz VI = 4.3 V CO = 4.7 ?F 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 100

OUTPUT SPECTRAL NOISE DENSITY vs FREQUENCY

Ground Current – ? A

CO = 4.7 ?F IO = 100 mA

CO = 10 ?F IO = 1 mA

CO = 4.7 ?F IO = 1 mA

VI = 4.3 V

CO = 10 ?F IO = 100 mA 1k 10k f – Frequency – Hz 100k

0

20

40

60

80 100 120 140

TA – Free-Air Temperature – °C

Figure 7

Figure 8

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? DALLAS, TEXAS 75265

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TPS76901, TPS76912, TPS76915, TPS76918, TPS76925 TPS76927, TPS76928, TPS76930, TPS76933, TPS76950 ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000

TYPICAL CHARACTERISTICS
TPS76933

OUTPUT IMPEDANCE vs FREQUENCY
2 1.8 1.6 Zo – Output Impedance – ? 1.4 1.2 1 0.8 0.6 0.4 0.2 0 10 100 IO = 100 mA IO = 1 mA VI = 4.3 V CO = 4.7 ?F ESR = 0.3 ? TA = 25° C 1000

DROPOUT VOLTAGE vs FREE-AIR TEMPERATURE
VI = 3.2 V CO = 4.7 ?F VDO – Dropout Voltage – mV

100 IO = 100 mA

10 IO = 10 mA

1k

10 k

100 k

1M

1 –60 –40 –20

0

20

40

60

80 100 120 140

f – Frequency – Hz

TA – Free-Air Temperature – °C

Figure 9
TPS76933

Figure 10

100 90 80 Ripple Rejection – dB 70 60 50 40 30 20 10 0 – 10 10

RIPPLE REJECTION vs FREQUENCY

LDO STARTUP TIME

EN IO = 1 mA

IO = 100 mA VI = 4.3 V CO = 4.7 ?F ESR = 0.3 ? 100 1k 10 k 100 k 1M 10 M VO

0

20

40

60

f – Frequency – Hz

80 100 120 140 160 180 200 t – Time – ?s

Figure 11

Figure 12

8

POST OFFICE BOX 655303

? DALLAS, TEXAS 75265

TPS76901, TPS76912, TPS76915, TPS76918, TPS76925 TPS76927, TPS76928, TPS76930, TPS76933, TPS76950 ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000

TYPICAL CHARACTERISTICS
TPS76915 LINE TRANSIENT RESPONSE
Current Load – mA

VO – Output Voltage – mV

TPS76915 LOAD TRANSIENT RESPONSE

10 0 –10 3.7

100

0

VI – Input Voltage – V

? VO – Change In Output Voltage – mV

0 –200 –400 VI = 2.7 V CO = 10 ?F ESR = 0.3 ? 0 20 40 60 80 100 120 140 160 180 200 t – Time – ?s

2.7 IL = 10 mA CO = 4.7 ?F ESR = 0.3 ? 0 20 40 60 80 100 120 140 160 180 200 t – Time – ?s

Figure 13
TPS76933 LINE TRANSIENT RESPONSE
Current Load – mA

Figure 14
TPS76933 LOAD TRANSIENT RESPONSE

VO – Output Voltage – mV

10 0 –10 5.3

100

0 VI = 4.3 V CO = 4.7 ?F ESR = 0.3 ? 100 0 –100

4.3 IL = 10 mA CO = 4.7 ?F ESR = 0.3 ? 0 20 40 60 80 100 120 140 160 180 t – Time – ?s

? VO – Change In Output Voltage – mV

VI – Input Voltage – V

0

20

40

60

80 100 120 140 160 180 t – Time – ?s

Figure 15

Figure 16

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? DALLAS, TEXAS 75265

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TPS76901, TPS76912, TPS76915, TPS76918, TPS76925 TPS76927, TPS76928, TPS76930, TPS76933, TPS76950 ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000

TYPICAL CHARACTERISTICS
TPS76933 TYPICAL REGIONS OF STABILITY TPS76933 TYPICAL REGIONS OF STABILITY

EQUIVALENT SERIES RESISTANCE (ESR)? vs OUTPUT CURRENT
100 ESR – Equivalent Series Resistance – ? ESR – Equivalent Series Resistance – ? VIN = 4.3 V CO = 4.7 ?F 3.3 V LDO Region of Instability 100

EQUIVALENT SERIES RESISTANCE (ESR) vs ADDED CERAMIC CAPACITANCE
VIN = 4.3 V CO = 4.7 ?F IL = 100 mA

10

Region of Instability 10

1

Region of Stability

Region of Stability

0.1

1 0 25 50 75 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 IO – Output Current – mA Added Ceramic Capacitance – ?F

Figure 17
TPS76933 TYPICAL REGIONS OF STABILITY

Figure 18
TPS76933 TYPICAL REGIONS OF STABILITY

EQUIVALENT SERIES RESISTANCE (ESR)? vs OUTPUT CURRENT
100 ESR – Equivalent Series Resistance – ? ESR – Equivalent Series Resistance – ? VIN = 4.3 V CO = 10 ?F 3.3 V LDO Region of Instability 10 100

EQUIVALENT SERIES RESISTANCE (ESR) vs ADDED CERAMIC CAPACITANCE
VIN = 4.3 V CO = 10 ?F IL = 100 mA

Region of Instability 10

1 Region of Stability

Region of Stability

0.1 0 25 50 75 100 IO – Output Current – mA

1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Added Ceramic Capacitance – ?F

Figure 19

Figure 20

10

POST OFFICE BOX 655303

? DALLAS, TEXAS 75265

TPS76901, TPS76912, TPS76915, TPS76918, TPS76925 TPS76927, TPS76928, TPS76930, TPS76933, TPS76950 ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000

APPLICATION INFORMATION
The TPS769xx family of low-dropout (LDO) regulators have been optimized for use in battery-operated equipment. They feature extremely low dropout voltages, low quiescent current (17 ?A nominally), and enable inputs to reduce supply currents to 1 ?A when the regulators are turned off.

device operation
The TPS769xx uses a PMOS pass element to dramatically reduce both dropout voltage and supply current over more conventional PNP-pass-element LDO designs. The PMOS pass element is a voltage-controlled device and, unlike a PNP transistor, it does not require increased drive current as output current increases. Supply current in the TPS769xx is essentially constant from no load to maximum load. Current limiting and thermal protection prevent damage by excessive output current and/or power dissipation. The device switches into a constant-current mode at approximately 350 mA; further load reduces the output voltage instead of increasing the output current. The thermal protection shuts the regulator off if the junction temperature rises above approximately 165°C. Recovery is automatic when the junction temperature drops approximately 25°C below the high temperature trip point. The PMOS pass element includes a back gate diode that conducts reverse current when the input voltage level drops below the output voltage level. A voltage of 1.7 V or greater on the EN input will disable the TPS769xx internal circuitry, reducing the supply current to 1?A. A voltage of less than 0.9 V on the EN input will enable the TPS769xx and will enable normal operation to resume. The EN input does not include any deliberate hysteresis, and it exhibits an actual switching threshold of approximately 1.5 V. A typical application circuit is shown in Figure 21.
TPS769xx? VI 1 IN

NC/FB

4 5

C1 1 ?F

OUT 3 EN GND 2

VO +

4.7 ?F

ESR = 0.2 ?

? TPS76912, TPS76915, TPS76918, TPS76925, TPS76927, TPS76928, TPS76930, TPS76933, TPS76950 (fixed-voltage options).

Figure 21. Typical Application Circuit

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TPS76901, TPS76912, TPS76915, TPS76918, TPS76925 TPS76927, TPS76928, TPS76930, TPS76933, TPS76950 ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000

APPLICATION INFORMATION external capacitor requirements
Although not required, a 0.047-?F or larger ceramic input bypass capacitor, connected between IN and GND and located close to the TPS769xx, is recommended to improve transient response and noise rejection. A higher-value electrolytic input capacitor may be necessary if large, fast-rise-time load transients are anticipated and the device is located several inches from the power source. Like all low dropout regulators, the TPS769xx requires an output capacitor connected between OUT and GND to stabilize the internal control loop. The minimum recommended capacitance is 4.7 ?F. The ESR (equivalent series resistance) of the capacitor should be between 0.2 ? and 10 ?. to ensure stability. Capacitor values larger than 4.7 ?F are acceptable, and allow the use of smaller ESR values. Capacitances less than 4.7 ?F are not recommended because they require careful selection of ESR to ensure stability. Solid tantalum electrolytic, aluminum electrolytic, and multilayer ceramic capacitors are all suitable, provided they meet the requirements described above. Most of the commercially available 4.7 ?F surface-mount solid tantalum capacitors, including devices from Sprague, Kemet, and Nichico, meet the ESR requirements stated above. Multilayer ceramic capacitors may have very small equivalent series resistances and may thus require the addition of a low value series resistor to ensure stability. CAPACITOR SELECTION PART NO. T494B475K016AS 195D106x0016x2T 695D106x003562T TPSC475K035R0600 MFR. KEMET SPRAGUE SPRAGUE AVX VALUE 4.7 ?F 10 ?F 10 ?F 4.7 ?F MAX ESR? 1.5 ? 1.5 ? 1.3 ? 0.6 ? SIZE (H × L × W)? 1.9 × 3.5 × 2.8 1.3 × 7.0 × 2.7 2.5 × 7.6 × 2.5 2.6 × 6.0 × 3.2

? Size is in mm. ESR is maximum resistance in Ohms at 100 kHz and TA = 25°C. Contact manufacturer for minimum ESR values.

12

POST OFFICE BOX 655303

? DALLAS, TEXAS 75265

TPS76901, TPS76912, TPS76915, TPS76918, TPS76925 TPS76927, TPS76928, TPS76930, TPS76933, TPS76950 ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000

APPLICATION INFORMATION output voltage programming
The output voltage of the TPS76901 adjustable regulator is programmed using an external resistor divider as shown in Figure 22. The output voltage is calculated using: V Where: Vref = 1.224 V typ (the internal reference voltage) Resistors R1 and R2 should be chosen for approximately 7-?A divider current. Lower value resistors can be used but offer no inherent advantage and waste more power. Higher values should be avoided as leakage currents at FB increase the output voltage error. The recommended design procedure is to choose R2 = 169 k? to set the divider current at 7 ?A and then calculate R1 using: R1 O

+ Vref

ǒ) ?
1 R1 R2

(1)

+

ǒ ?
V O V ref

*1

R2

(2)

OUTPUT VOLTAGE PROGRAMMING GUIDE OUTPUT VOLTAGE (V) 2.5 3.3 3.6 4.0 5.0 DIVIDER RESISTANCE (k?)? R1 174 287 324 383 523 R2 169 169 169 169 169 VI 1 ?F 1

TPS76901

IN 5 R1 FB GND 2 4 4.7 ?F R2 ESR = 0.2 ?

≥ 1.7 V ≤ 0.9 V

OUT 3 EN

VO

? 1% values shown.

Figure 22. TPS76901 Adjustable LDO Regulator Programming

POST OFFICE BOX 655303

? DALLAS, TEXAS 75265

13

TPS76901, TPS76912, TPS76915, TPS76918, TPS76925 TPS76927, TPS76928, TPS76930, TPS76933, TPS76950 ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000

APPLICATION INFORMATION power dissipation and junction temperature
Specified regulator operation is assured to a junction temperature of 125°C; the maximum junction temperature should be restricted to 125°C under normal operating conditions. This restriction limits the power dissipation the regulator can handle in any given application. To ensure the junction temperature is within acceptable limits, calculate the maximum allowable dissipation, PD(max), and the actual dissipation, PD, which must be less than or equal to PD(max). The maximum-power-dissipation limit is determined using the following equation: P Where: TJmax is the maximum allowable junction temperature RθJA is the thermal resistance junction-to-ambient for the package, i.e., 285°C/W for the 5-terminal SOT23. TA is the ambient temperature. The regulator dissipation is calculated using: P D T max * T J A + D(max) R

qJA

+ VI * VO

ǒ

?

I

O

Power dissipation resulting from quiescent current is negligible. Excessive power dissipation will trigger the thermal protection circuit.

regulator protection
The TPS769xx PMOS-pass transistor has a built-in back diode that conducts reverse current when the input voltage drops below the output voltage (e.g., during power down). Current is conducted from the output to the input and is not internally limited. If extended reverse voltage operation is anticipated, external limiting might be appropriate. The TPS769xx features internal current limiting and thermal protection. During normal operation, the TPS769xx limits output current to approximately 350 mA. When current limiting engages, the output voltage scales back linearly until the overcurrent condition ends. While current limiting is designed to prevent gross device failure, care should be taken not to exceed the power dissipation ratings of the package. If the temperature of the device exceeds approximately 165°C, thermal-protection circuitry shuts it down. Once the device has cooled down to below approximately 140°C, regulator operation resumes.

14

POST OFFICE BOX 655303

? DALLAS, TEXAS 75265

TPS76901, TPS76912, TPS76915, TPS76918, TPS76925 TPS76927, TPS76928, TPS76930, TPS76933, TPS76950 ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000

MECHANICAL DATA
DBV (R-PDSO-G5)
0,40 0,20 5 4

PLASTIC SMALL-OUTLINE PACKAGE

0,95

0,25 M

1,80 1,50

3,00 2,50

0,15 NOM

1 3,10 2,70

3

Gage Plane

0,25 0°– 8° 0,55 0,35

Seating Plane 1,30 1,00 0,05 MIN 0,10

4073253-4/B 10/97 NOTES: A. All linear dimensions are in millimeters. B. This drawing is subject to change without notice. C. Body dimensions include mold flash or protrusion.

POST OFFICE BOX 655303

? DALLAS, TEXAS 75265

15

IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer’s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI’s publication of information regarding any third party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.

Copyright ? 2000, Texas Instruments Incorporated


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