Texas Instruments TPS77050DBVT, TPS77050DBVR, TPS77033DBVT, TPS77033DBVR, TPS77030DBVT Datasheet

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025
TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

D

50-mA Low-Dropout Regulator

D

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

DBV PACKAGE

(TOP VIEW)

1

IN

OUT

5

Adjustable Versions

D

Only 17 µA Quiescent Current at 50 mA

D

1 µA Quiescent Current in Standby Mode

D

Dropout Voltage Typically 35 mV @ 50mA

D

Over Current Limitation

D

–40°C to 125°C Operating Junction

GND

EN

2

3

4

NC/FB

T emperature Range

D

5-Pin SOT-23 (DBV) Package

description

The TPS770xx family of low-dropout (LDO) voltage regulators offers the benefits of low dropout voltage, ultra
low-power operation, and miniaturized packaging. These regulators feature low dropout voltages and ultra low
quiescent current compared to conventional LDO regulators. Offered in a 5-terminal small outline
integrated-circuit SOT-23 package, the TPS770xx series devices are ideal for micropower operations and
where board space is at a premium.

A combination of new circuit design and process innovation has enabled the usual PNP pass transistor to be
replaced by a PMOS pass element. Because the PMOS pass element behaves as a low-value resistor, the
dropout voltage is very low — typically 35 mV at 50 mA of load current (TPS77050) — and is directly proportional
to the load current. Since the PMOS pass element is a voltage-driven device, the quiescent current is ultra low
(28 µA maximum) and is stable over the entire range of output load current (0 mA to 50 mA).
Intended for use in portable systems such as
laptops and cellular phones, the ultra low-dropout
voltage feature and ultra low-power operation
result in a significant increase in system battery
operating life.

The TPS770xx also features a logic-enabled
sleep mode to shut down the regulator, reducing
quiescent current to 1 µA typical at T

= 25°C. The

J

TPS770xx 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).

22

21

20

19

18

FREE-AIR TEMPERATURE

VI = 4.3 V
CO = 4.7 µF

TPS77033

GROUND CURRENT

vs

IO = 50 mA

IO = 0 mA

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.

Ground Current – Aµ

17

16

15

–40 0–20 20 140–60 40 80 100 12060

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TA – Free-Air Temperature – °C

Copyright  1999, Texas Instruments Incorporated

1

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025

(DBV)

TPS77027, TPS77028, TPS77030, TPS77033, TPS77050
ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

AVAILABLE OPTIONS

T

J

–40°C to 125°C

†

The DBVT indicates tape and reel of 250 parts.

‡

The DBVR indicates tape and reel of 3000 parts.

functional block diagram

VOLTAGE PACKAGE PART NUMBER SYMBOL

Variable

1.2V to 5.5V

1.2 V TPS77012DBVT†TPS77012DBVR

1.5 V TPS77015DBVT†TPS77015DBVR

1.8 V

2.5 V

2.7 V

2.8 V TPS77028DBVT†TPS77028DBVR

3.0 V TPS77030DBVT†TPS77030DBVR

3.3 V TPS77033DBVT†TPS77033DBVR

5.0 V TPS77050DBVT†TPS77050DBVR

SOT-23

TPS77001DBVT†TPS77001DBVR

TPS77018DBVT†TPS77018DBVR
TPS77025DBVT†TPS77025DBVR
TPS77027DBVT†TPS77027DBVR

TPS77001

‡

PCPI

‡

PCQI

‡

PCRI

‡

PCSI

‡

PCTI

‡

PCUI

‡

PCVI

‡

PCWI

‡

PCXI

‡

PCYI

EN

GND

GND

IN

EN

OUT

Current Limit

/ Thermal

V

REF

TPS77012/15/18/25/27/28/30/33/50

IN

V

REF

Protection

FB

OUT

Current Limit

/ Thermal

Protection

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

I/O

DESCRIPTION

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025
TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

Terminal Functions

TERMINAL

NAME NO.

GND 2 Ground
EN 3 I Enable input
FB 4 I Feedback voltage (TPS77001 only)
IN 1 I Input supply voltage
NC 4 No connection (Fixed options only)
OUT 5 O Regulated output voltage

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Input voltage range

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, T
Storage temperature range, T

†

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.

Recommended DBV 350 mW 3.5 mW/°C 192 mW 140 mW

Absolute Maximum DBV 437 mW 3.5 mW/°C 280 mW 227 mW

(see Note 1)

stg

PACKAGE

–0.3 V to 13.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–40°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

J

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DISSIPATION RATING TABLE

TA ≤ 25°C

POWER RATING

DERATING FACTOR

ABOVE TA = 25°C

TA = 70°C

POWER RATING

POWER RATING

TA = 85°C

recommended operating conditions

MIN NOM MAX UNIT

Input voltage, VI (see Note 2) 2.7 10 V
Output voltage range, V
Continuous output current, IO (see Note 3) 0 50 mA
Operating junction temperature, T

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.

O

J

1.2 5.5 V

–40 125 °C

Ĕ

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025

TPS77001

TPS77012

TPS77015

TPS77018

TPS77025

(10 µA to 50 mA Load)
(See

)

V

(See Note 4)

TPS77027

TPS77028

TPS77030

TPS77033

TPS77050

()

A

Output voltage line regulation (∆VO/V
Standby current

TPS77027, TPS77028, TPS77030, TPS77033, TPS77050
ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

electrical characteristics over recommended operating free–air temperature range, VI = V
1 V, I

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

= 50 mA, EN = 0V, C

O

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Output voltage

Note 4

Quiescent current (GND current)
(See Note 4)

p

(See Notes 4 and 5)

Load regulation

Output noise voltage
Output current limit VO = 0V , See Note 4 350 750 mA

10 µA, maximum output current 50 mA.

5. If VO≤ 1.8 V then V

= 4.7 µF (unless otherwise noted)

O

1.2 V ≤ VO ≤ 5.5 V, TJ = 25°C V

1.2 V ≤ VO ≤ 5.5 V, TJ = –40°C to 125°C 0.97V
TJ = 25°C, 2.7 V < VIN < 10 V 1.224
TJ = –40°C to 125°C, 2.7 V < VIN < 10 V 1.187 1.261
TJ = 25°C, 2.7 V < VIN < 10 V 1.5
TJ = –40°C to 125°C, 2.7 V < VIN < 10 V 1.455 1.545
TJ = 25°C, 2.8 V < VIN < 10 V 1.8
TJ = –40°C to 125°C, 2.8 V < VIN < 10 V 1.746 1.854
TJ = 25°C, 3.5 V < VIN < 10 V 2.5
TJ = –40°C to 125°C, 3.5 V < VIN < 10 V 2.425 2.575
TJ = 25°C, 3.7 V < VIN < 10 V 2.7
TJ = –40°C to 125°C, 3.7 V < VIN < 10 V 2.619 2.781
TJ = 25°C, 3.8 V < VIN < 10 V 2.8
TJ = –40°C to 125°C, 3.8 V < VIN < 10 V 2.716 2.884
TJ = 25°C, 4.0 V < VIN < 10 V 3.0
TJ = –40°C to 125°C, 4.0 V < VIN < 10 V 2.910 3.090
TJ = 25°C, 4.3 V < VIN < 10 V 3.3
TJ = –40°C to 125°C, 4.3 V < VIN < 10 V 3.201 3.399
TJ = 25°C, 6.0 V < VIN < 10 V 5.0
TJ = –40°C to 125°C, 6.0 V < VIN < 10 V 4.850 5.150
EN = 0V, 0 mA < IO < 50mA,

TJ = 25°C
EN = 0V, IO = 50mA,

TJ = –40°C to 125°C

O

)

= 2.7 V, V

imin

imax

Line Reg. (mV)

VO + 1 V < VI ≤ 10 V, TJ = 25°C 0.04
VO + 1 V < VI ≤ 10 V,

TJ = –40°C to 125°C
EN = 0V, IO = 0 to 50 mA,

TJ = 25°C
BW = 300 Hz to 50 kHz,

Co = 10 µF, TJ = 25°C

EN = VI , 2.7 < VI < 10 V 1 µA
TJ = –40°C to 125°C 2 µA

= 10 V:

ǒ

V

V

+ǒ%ńVǓ

O

imax

100

*

2.7 V

O

O

1.03V

O

17

28

0.1

8 mV

190 µVrms

Ǔ

1000

O(typ)

µ

%/V

+

If VO≥ 2.5 V then V

4

= VO + 1 V, V

imin

Line Reg. (mV)

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

= 10 V:

imax

+ǒ%ńVǓ

ǒ

V

imax

*ǒVO)

V

O

100

1V

Ǔ

Ǔ

1000

Input current (EN)

TPS77028

TPS77030

g

mV

TPS77033

TPS77050

VOOutput voltage

Equivalent series resistance (ESR)

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025
TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

electrical characteristics over recommended operating free–air temperature range, VI = V
1 V, I

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

= 50 mA, EN = 0V, C

O

PARAMETER TEST CONDITIONS

FB input current FB = 1.224 V (TPS77001) –1 1 µA
High level enable input voltage 2.7 V < VI < 10 V 1.7 V
Low level enable input voltage 2.7 V < VI < 10 V 0.9 V

Power supply ripple rejection

p

Dropout voltage
(See Note 6)

10 µA, maximum output current 50 mA.

6. IN voltage equals VO(Typ) –100mV; TPS77001 output voltage set to 3.3 V nominal with external resistor divider. TPS77012,
TPS77015, TPS77018, TPS77025, and TPS77027 dropout voltage limited by input voltage range limitations.

= 4.7 µF (unless otherwise noted) (continued)

O

f = 1 kHz, CO = 10 µF,
TJ = 25°C, See Note 4

EN = 0 V –1 0 1 µA
EN = V

I

IO = 50 mA, TJ = 25°C 60
IO = 50 mA TJ = –40°C to 125°C 125
IO = 50 mA, TJ = 25°C 57
IO = 50 mA TJ = –40°C to 125°C 115
IO = 50 mA, TJ = 25°C 48
IO = 50 mA TJ = –40°C to 125°C 100
IO = 50 mA, TJ = 25°C 35
IO = 50 mA TJ = –40°C to 125°C 85

MIN TYP MAX UNIT

60 dB

–1 1 µA

O(typ)

+

TYPICAL CHARACTERISTICS

Table of Graphs

FIGURE

p

Ground current vs Free-air temperature 7
Output spectral noise density vs Frequency 8

Z

o

V

DO

Output impedance vs Frequency 9
Dropout voltage vs Free-air temperature 10
Ripple rejection vs Frequency 11
LDO startup time 12
Line transient response 13, 15
Load transient response 14, 16

vs Output current 1, 2, 3
vs Free-air temperature 4, 5, 6

vs Output current 17, 19
vs Added ceramic capacitance 18, 20

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

5

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025
TPS77027, TPS77028, TPS77030, TPS77033, TPS77050
ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

TYPICAL CHARACTERISTICS

2.498

2.496

2.494

2.492

2.490

2.488

– Output Voltage – V

O

V

2.486

2.484

2.482

TPS77025

OUTPUT VOLTAGE

vs

OUTPUT CURRENT

VI = 3.5 V
CO = 4.7 µF
TA = 25° C

050

10 30

20 40

IO – Output Current – mA

1.498

1.496

1.494

1.492

1.490

– Output Voltage – V

1.488

O

V

1.486

1.484
050

10 30

Figure 1

TPS77015

OUTPUT VOLTAGE

vs

OUTPUT CURRENT

20 40

IO – Output Current – mA

Figure 2

VI = 2.7 V
CO = 4.7 µF
TA = 25° C

3.284

3.282

3.280

3.278

3.276

– Output Voltage – V

3.274

O

V

3.272

3.270

TPS77033

OUTPUT VOLTAGE

vs

OUTPUT CURRENT

1.496

VI = 4.3 V
CO = 4.7 µF
TA = 25° C

10 3020 40050

IO – Output Current – mA

1.494

1.492

1.490

1.488

1.486

– Output Voltage – V

O

V

1.484

1.482

1.480
–60

FREE-AIR TEMPERATURE

–40 0

–20 20 140

TA – Free-Air Temperature – °C

Figure 3

TPS77015

OUTPUT VOLTAGE

vs

IO = 1 mA

IO = 50 mA

40 80

60

Figure 4

VI = 2.7 V
CO = 4.7 µF

100 120

6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025
TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

TYPICAL CHARACTERISTICS

2.496

2.494

2.492

2.490

2.488

2.486

2.484

– Output Voltage – V

2.482

O

V

2.480

2.478

2.476

TPS77025

OUTPUT VOLTAGE

vs

FREE-AIR TEMPERATURE

IO = 1 mA

IO = 50 mA

VI = 3.5 V
CO = 4.7 µF

–40 0–20 20 140–60 40 80 100 12060

TA – Free-Air Temperature – °C

Figure 5

3.285

3.280

3.275

3.270

3.265

– Output Voltage – V

O

V

3.260

3.255

TPS77033

OUTPUT VOLTAGE

vs

FREE-AIR TEMPERATURE

VI = 4.3 V
CO = 4.7 µF

–40 0–20 20 140–60 40 80 100 12060

TA – Free-Air Temperature – °C

IO = 1 mA

IO = 50 mA

Figure 6

TPS77033

GROUND CURRENT

vs

OUTPUT SPECTRAL NOISE DENSITY

FREE-AIR TEMPERATURE

22

VI = 4.3 V
CO = 4.7 µF

21

20

19

IO = 50 mA

18

Ground Current – Aµ

17

16

15

–40 0–20 20 140–60 40 80 100 12060

TA – Free-Air Temperature – °C

IO = 0 mA

2

1.8

V HzOutput Spectral Noise Density – µ

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2
0

100

CO = 4.7 µF
IO = 50 mA

VI = 4.3 V

f – Frequency – Hz

Figure 7

TPS77033

vs

FREQUENCY

CO = 10 µF
IO = 1 mA

CO = 4.7 µF
IO = 1 mA

CO = 10 µF
IO = 50 mA

1k 10k 100k

Figure 8

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

7

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025
TPS77027, TPS77028, TPS77030, TPS77033, TPS77050
ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

TYPICAL CHARACTERISTICS

OUTPUT IMPEDANCE

vs

FREQUENCY

2

VI = 4.3 V
CO = 4.7 µF

1.8

1.6

Ω

1.4

1.2

1

0.8

0.6

– Output Impedance –Z

o

0.4

0.2
0

IO = 1 mA

IO = 50 mA

100 1M10 1k

f – Frequency – Hz

10k

100k

100

10

– Dropout Voltage – mV

DO

V

1

FREE-AIR TEMPERATURE

VI = 3.2 V
CO = 4.7 µF

–40 0–20 20 140–60 40 80 100 12060

TA – Free-Air Temperature – °C

Figure 9

TPS77033

DROPOUT VOLTAGE

vs

IO = 50 mA

IO = 10 mA

Figure 10

RIPPLE REJECTION

100

90
80

70
60
50
40
30

Ripple Rejection – dB

20
10

VI = 4.3 V
CO = 4.7 µF

0

ESR = 0.3 Ω

–10

10

TPS77033

vs

FREQUENCY

IO = 1 mA

IO = 50 mA

f – Frequency – Hz

Figure 11

LDO STARTUP TIME

EN

V

O

10 M1 M100 k10 k1 k100

0604020 80 100 140120 160 180 200

t – Time – µs

Figure 12

8

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025
TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

TYPICAL CHARACTERISTICS

TPS77015

LINE TRANSIENT RESPONSE

10

0

–10

– Output Voltage – mV

O

V

3.7

2.7
IL = 10 mA

– Input Voltage – V

I

V

CO = 4.7 µF
ESR = 0.3 Ω

0604020 80 100 140120 160 180 200

t – Time – µs

Figure 13

TPS77033

LINE TRANSIENT RESPONSE

50

0

Current Load – mA

0

–50

–100

Output Voltage – mV

– Change In

O

V

∆

0604020 80 100 140120 160 180 200

TPS77015

LOAD TRANSIENT RESPONSE

VI = 2.7 V
CO = 10 µF
ESR = 0.3 Ω

t – Time – µs

Figure 14

TPS77033

LOAD TRANSIENT RESPONSE

10

0

–10

– Output Voltage – mVV

O

V

5.3

4.3
IL = 10 mA

– Input Voltage – V

I

CO = 4.7 µF
ESR = 0.3 Ω

0604020 80 100 140120 160 180

t – Time – µs

Figure 15

50

0

Current Load – mA

0

–20

Output Voltage – mV

– Change In

–40

O

V

∆

0604020 80 100 140120 160 180

t – Time – µs

Figure 16

VI = 4.3 V
CO = 4.7 µF
ESR = 0.3 Ω

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

9

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025
TPS77027, TPS77028, TPS77030, TPS77033, TPS77050
ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

TYPICAL CHARACTERISTICS

TPS77033

TYPICAL REGIONS OF STABILITY

EQUIVALENT SERIES RESISTANCE (ESR)

†

vs

OUTPUT CURRENT

100

VIN = 4.3 V
CO = 4.7 µF
ESR = 0.3 Ω

3.3 V LDO

10

1

ESR – Equivalent Series Resistance – Ω

0.1
02550

Region of Instability

Region of Stability

ESR – Equivalent Series Resistance – Ω

5 1015 20 30354045

IO – Output Current – mA

Figure 17

TPS77033

TYPICAL REGIONS OF STABILITY

EQUIVALENT SERIES RESISTANCE (ESR)

vs

ADDED CERAMIC CAPACITANCE

100

VIN = 4.3 V
CO = 4.7 µF
IL = 50 mA

Region of Instability

10

Region of Stability

1

0 0.1 0.2 0.3 0.4 0.5

Added Ceramic Capacitance – µF

0.6 0.7 0.8 0.9 1

Figure 18

TPS77033

TYPICAL REGIONS OF STABILITY

EQUIVALENT SERIES RESISTANCE (ESR)

†

vs

OUTPUT CURRENT

100

VIN = 4.3 V
CO = 10 µF
ESR = 0.3 Ω

Region of Instability

10

Region of Stability

ESR – Equivalent Series Resistance – Ω

1

02550

5101520 30354045

IO – Output Current – mA

3.3 V LDO

ESR – Equivalent Series Resistance – Ω

Figure 19

TPS77033

TYPICAL REGIONS OF STABILITY

EQUIVALENT SERIES RESISTANCE (ESR)

vs

ADDED CERAMIC CAPACITANCE

100

VIN = 4.3 V
CO = 10 µF
IL = 50 mA

Region of Instability

10

Region of Stability

1

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Added Ceramic Capacitance – µF

Figure 20

10

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025
TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

APPLICATION INFORMATION

The TPS770xx 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 µA nominally), and enable
inputs to reduce supply currents to less than 1 µA when the regulators are turned off.

device operation

The TPS770xx 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 TPS770xx 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 TPS770xx internal circuitry, reducing the supply
current to 1µA. A voltage of less than 0.9 V on the EN
operation to resume. The EN input does not include any deliberate hysteresis, and it exhibits an actual switching
threshold of approximately 1.5 V.

input will enable the TPS770xx and will enable normal

A typical application circuit is shown in Figure 21.

1

V

I

C1

1 µF

†

TPS77012, TPS77015, TPS77018, TPS77025, TPS77027,
TPS77028, TPS77030, TPS77033, TPS77050 (fixed-voltage options).

IN

3

EN

Figure 21. Typical Application Circuit

TPS770xx

NC/FB

OUT

GND

2

†

4

5

V

O

+

4.7 µF

ESR = 0.2 Ω

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

11

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025
TPS77027, TPS77028, TPS77030, TPS77033, TPS77050
ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

APPLICATION INFORMATION

external capacitor requirements

Although not required, a 0.047-µF or larger ceramic input bypass capacitor , connected between IN and GND
and located close to the TPS770xx, 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 TPS770xx requires an output capacitor connected between OUT and GND
to stabilize the internal control loop. The minimum recommended capacitance is 4.7 µF. The ESR (equivalent
series resistance) of the capacitor should be between 0.2 Ω and 10 Ω. to ensure stability . Capacitor values larger
than 4.7 µF are acceptable, and allow the use of smaller ESR values. Capacitances less than 4.7 µF 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 µF 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.

CAP ACITOR SELECTION

PART NO. MFR. VALUE MAX ESR

T494B475K016AS KEMET 4.7 µF 1.5 Ω 1.9 × 3.5 × 2.8
195D106x0016x2T SPRAGUE 10 µF 1.5 Ω 1.3 × 7.0 × 2.7
695D106x003562T SPRAGUE 10 µF 1.3 Ω 2.5 × 7.6 × 2.5
TPSC475K035R0600 AVX 4.7 µF 0.6 Ω 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.

†

SIZE (H × L × W)

†

12

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025
TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

APPLICATION INFORMATION

output voltage programming

The output voltage of the TPS77001 adjustable regulator is programmed using an external resistor divider as
shown in Figure 22. The output voltage is calculated using:

R1

VO+

V

ǒ1

ref

where

V

= 1.224 V typ (the internal reference voltage)

ref

Resistors R1 and R2 should be chosen for approximately 7-µA 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 kΩ to set the divider current at 7 µA and then calculate R1 using:

V

R1

+ ǒ

O

*

V

ref

)

1

Ǔ

R2

Ǔ

R2

(1)

(2)

OUTPUT VOLTAGE

PROGRAMMING GUIDE

OUTPUT

VOLTAGE

(V)

2.5

3.3

3.6

4.0

5.0

‡

1% values shown.

DIVIDER RESISTANCE

TPS77001

‡

(kΩ)

R1 R2

174
287
324
383
523

169
169
169
169
169

V

≥1.7 V

I
1 µF

≤0.9 V

1

IN

5

OUT

3

EN

GND

4

FB

2

Figure 22. TPS77001 Adjustable LDO Regulator Programming

R1

R2

V

O

4.7 µF

ESR = 0.2 Ω

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

13

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025
TPS77027, TPS77028, TPS77030, TPS77033, TPS77050
ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

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. T o ensure the junction temperature is within acceptable limits,
calculate the maximum allowable dissipation, P
or equal to P

The maximum-power-dissipation limit is determined using the following equation:

D(max)

.

, and the actual dissipation, PD, which must be less than

D(max)

P

D(max)

Where

TJmax is the maximum allowable junction temperature

R

θJA

SOT23.
T

is the ambient temperature.

A

The regulator dissipation is calculated using:

PD+ǒVI*

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

TJmax*T

+

R

is the thermal resistance junction-to-ambient for the package, i.e., 285°C/W for the 5-terminal

Ǔ

V

O

A

q

JA

I

O

regulator protection

The TPS770xx 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 TPS770xx features internal current limiting and thermal protection. During normal operation, the TPS770xx
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

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025
TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

MECHANICAL DATA

DBV (R-PDSO-G5) PLASTIC SMALL-OUTLINE PACKAGE

0,95

1,30
1,00

0,40
0,20

45

1,80
1,50

1

3,10

2,70

3

0,05 MIN

M

0,25

3,00
2,50

Seating Plane

0,10

0,15 NOM

0°–8°

Gage Plane

0,25

0,55
0,35

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.

4073253-4/B 10/97

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

15

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Copyright  1999, Texas Instruments Incorporated