Texas Instruments TPS76428DBVT, TPS76428DBV, TPS76428DBVR, TPS76427DBVT, TPS76427DBVR Datasheet

(DBV)

TPS76425, TPS76427, TPS76428, TPS76430, TPS76433

LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS

SLVS180A – MARCH 1999 – REVISED JUNE 1999

D

150-mA Low Noise, Low-Dropout Regulator

D

Output Voltage: 2.5 V, 2.7 V, 2.8 V, 3.0 V, 3.3 V

D

Output Noise Typically 50 µV

D

Quiescent Current Typically 85 µA

D

Dropout Voltage, Typically 300 mV
at 150 mA

D

Thermal Protection

D

Over Current Limitation

D

Less Than 2-µA Quiescent Current in

GND

DBV PACKAGE

IN

EN

(TOP VIEW)

1

5

2

3

4

OUT

BYPASS

Shutdown Mode

D

–40°C to 125°C Operating Junction
T emperature Range

D

5-Pin SOT-23 (DBV) Package

description

The TPS764xx family of low-dropout (LDO) voltage regulators offers the benefits of a low noise, low-dropout
voltage, low-power operation, and miniaturized package. Additionally , they feature low quiescent current when
compared to conventional LDO regulators. Offered in 5-terminal small outline integrated-circuit SOT-23
package, the TPS764xx series devices are ideal for low-noise applications, cost-sensitive designs and
applications 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 300 mV at 150 mA of load current (TPS76433)—and is directly
proportional to the load current. Since the PMOS pass element is a voltage-driven device, the quiescent current
is very low (140 µA maximum) and is stable over the entire range of output load current (0 mA to 150 mA).
Intended for use in portable systems such as laptops and cellular phones, the low-dropout voltage feature and
low-power operation result in a significant increase in system battery operating life.

The TPS764xx also features a logic-enabled sleep mode to shut down the regulator, reducing quiescent current
to 1 µA maximum at T

T

J

–40°C to 125°C

†

The DBVT passive indicates tape and reel of 250 parts.

‡

The DBVR passive indicates tape and reel of 3000 parts.

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.

= 25°C.The TPS764xx is offered in 2.5-V , 2.7-V, 2.8-V , 3.0-V, and 3.3-V fixed-voltages.

J

AVAILABLE OPTIONS

VOLTAGE PACKAGE PART NUMBER SYMBOL

2.5 V TPS76425DBVT†TPS76425DBVR

2.7 V

2.8 V

3.0 V

3.3 V TPS76433DBVT†TPS76433DBVR

SOT-23

TPS76427DBVT†TPS76427DBVR
TPS76428DBVT†TPS76428DBVR
TPS76430DBVT†TPS76430DBVR

Copyright  1999, Texas Instruments Incorporated

‡

PBJI

‡

PBKI

‡

PCEI

‡

PBLI

‡

PBMI

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

1

TPS76425, TPS76427, TPS76428, TPS76430, TPS76433

I/O

DESCRIPTION

LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS

SLVS180A – MARCH 1999 – REVISED JUNE 1999

functional block diagram

TPS76425/ 27/ 28/ 30/ 33

IN

EN

BYPASS

V

REF

GND

TERMINAL

NAME

GND Ground
EN I Enable input
BYPASS Output bypass capacitor
IN I Input supply voltage
OUT O Regulated output voltage

OUT

Current Limit

/ Thermal

Protection

Terminal Functions

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS76425, TPS76427, TPS76428, TPS76430, TPS76433

LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS

SLVS180A – MARCH 1999 – REVISED JUNE 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, 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Peak output current Internally limited. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ESD rating, HBM 2 kV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous total power dissipation See dissipation rating tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

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

(see Note 1)

stg

PACKAGE

–0.3 V to 10 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

TA = 85°C

POWER RATING

recommended operating conditions

MIN NOM MAX UNIT

Input voltage, VI
Continuous output current, I
Operating junction temperature, T

†

To calculate the minimum input voltage for your maximum output current, use the following equation: V

†

O

J

2.7 10 V
0 150 mA

–40 125 °C

I(min)

= V

O(max)

+ V

DO(max load)

Ĕ

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3

TPS76425, TPS76427, TPS76428, TPS76430, TPS76433

I

100 mA

T

25°C

2.45

2.5

2.55

TPS76425

V

TPS76427

V

VOOut ut voltage

TPS76428

V

TPS76430

V

TPS76433

V

(Q)

(GND terminal current)

µ

µ

Standby current

LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS

SLVS180A – MARCH 1999 – REVISED JUNE 1999

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

NOTES: 2. Minimum IN operating voltage is 2.7 V or V

= 1 mA, EN = IN, CO = 4.7 µF (unless otherwise noted)

O

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

= 1 mA to

O
IO = 1 mA to 100 mA 2.425 2.5 2.575
IO = 1 mA to 150 mA, TJ = 25°C 2.438 2.5 2.562
IO = 1 mA to 150 mA 2.407 2.5 2.593
IO = 1 mA to 100 mA, TJ = 25°C 2.646 2.7 2.754

IO = 1 mA to 100 mA 2.619 2.7 2.781
IO = 1 mA to 150 mA, TJ = 25°C 2.632 2.7 2.768
IO = 1 mA to 150 mA 2.598 2.7 2.8013
IO = 1 mA to 100 mA TJ = 25°C 2.744 2.8 2.856

p

I

V

n

PSRR Ripple rejection f = 1 kHz, Co = 10 µF, TJ = 25°C, See Note 2 60 dB

Quiescent current

Output noise voltage
Bypass voltage TJ = 25°C 1.192 V

Current limit TJ = 25°C See Note 3 0.8 1.5 A

3. Test condition includes, output voltage VO=0 V and pulse duration = 10 mS.

IO = 1 mA to 150 mA, 2.73 2.8 2.870
IO = 1 mA to 150 mA, TJ = 25°C 2.716 2.8 2.884
IO = 1 mA to 150 mA 2.695 2.8 2.905
IO = 1 mA to 100 mA, TJ = 25°C 2.94 3.0 3.06
IO = 1 mA to 100 mA 2.925 3.0 3.075
IO = 1 mA to 150 mA, TJ = 25°C 2.91 3.0 3.090
IO = 1 mA to 150 mA 2.887 3.0 3.112
IO = 1 mA to 100 mA, TJ = 25°C 3.234 3.3 3.366
IO = 1 mA to 100 mA 3.201 3.3 3.399
IO = 1 mA to 150 mA, TJ = 25°C 3.218 3.3 3.382
IO = 1 mA to 150 mA 3.177 3.3 3.423
IO = 0 to 150 mA,

See Note 2
IO = 0 to 150 mA, See Note 2 140
EN < 0.5 V, TJ = 25°C 0.5 1
EN < 0.5 V 2
BW = 300 Hz to 50 kHz,

TJ = 25°C,

O(typ)

,

+ 1 V, whichever is greater.

=

J

TJ = 25°C,

Co = 10 µF,
See Note 2

85 100

50 µV

O(typ)

+

A

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

gg(

OO

)

%/V

V

IIEN input current

A

TPS76425

mV

V

g

TPS76433

mV

TPS76425, TPS76427, TPS76428, TPS76430, TPS76433

LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS

SLVS180A – MARCH 1999 – REVISED JUNE 1999

electrical characteristics over recommended operating free–air temperature range,

= V

V

I

V

IH

V

IL

DO

NOTES: 2. Minimum IN operating voltage is 2.7 V or V

+ 1 V, IO= 1 mA, EN = IN, CO = 4.7 µF (unless otherwise noted) (continued)

O(typ)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Output voltage line regulation (∆V
(see Note 4)

EN high level input See Note 2 1.4 2
EN low level input See Note 2 0.5 1.2

p

Dropout voltage
(Note 5)

4. If VO < 2.5 V and V

imax

/V

= 10 V, V

imin

Line Reg. (mV)

If VO > 2.5 V and V

imax

= 10 V, V

imin

Line Reg. (mV)

5. Dropout voltage is defined as the differential voltage between VO and Vi when VO drops 100 mV below the value measured with
Vi = VO + 1.0 V .:

VO + 1 V < VI ≤ 10 V, VI ≥ 3.5 V, TJ = 25°C 0.04 0.07

)

VO + 1 V < VI ≤ 10 V,

EN = 0 V –0.01 –0.5
EN = IN –0.01 –0.5
IO = 0 mA, TJ = 25°C 0.2
IO = 1 mA, TJ = 25°C 3
IO = 50 mA, TJ = 25°C 120 150
IO = 50 mA 200
IO = 75 mA, TJ = 25°C 180 225
IO = 75 mA 300
IO = 100 mA, TJ = 25°C 240 300
IO = 100 mA 400
IO = 150 mA, TJ = 25°C 360 450
IO = 150 mA 600
IO = 0 mA, TJ = 25°C 0.2
IO = 1 mA, TJ = 25°C 3
IO = 50 mA, TJ = 25°C 100 125
IO = 50 mA 166
IO = 75 mA, TJ = 25°C 150 188
IO = 75 mA 250
IO = 100 mA, TJ = 25°C 200 250
IO = 100 mA 333
IO = 150 mA, TJ = 25°C 300 375
IO = 150 mA 500

+ 1 V, whichever is greater.

O(typ)

= 3.5 V:

ǒ

V

+ǒ%ńVǓ

= VO + 1 V:

+ǒ%ńVǓ

O

ǒ

V

O

VI ≥ 3.5 V 0.1

V

V

imax

100

imax

*

*ǒVO)

100

3.5 V

Ǔ

1000

Ǔ

Ǔ

1

1000

µ

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

5

TPS76425, TPS76427, TPS76428, TPS76430, TPS76433

VOOutput voltage

VnOutput noise voltage

Compensation series resistance (CSR)

LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS

SLVS180A – MARCH 1999 – REVISED JUNE 1999

TYPICAL CHARACTERISTICS

Table of Graphs

p

V

n

Z

o

V

DO

Output noise vs Frequency 5

p

Output impedance vs Frequency 8
Dropout voltage vs Free-air temperature 9
Ripple rejection vs Frequency 10
Line transient response 11, 13
Load transient response 12, 14

p

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

vs Bypass capacitance 6
vs Load current 7

vs Output current 15, 17
vs Added ceramic capacitance 16, 18

FIGURE

2.505

2.5

2.495

2.49

2.485

– Output Voltage – V

O

V

2.48

2.475

TPS76425

OUTPUT VOLTAGE

vs

OUTPUT CURRENT

VI = 3.5 V
CI = CO = 4.7 µF
TA = 25°C

30 90

0 150

IO – Output Current – mA (Pulse Tested)

60 120 180

Figure 1

2.53

2.52

2.51

2.5

2.49

– Output Voltage – V

O

V

2.48

2.47
–55

TPS76425

OUTPUT VOLTAGE

vs

FREE-AIR TEMPERATURE

VI = 3.5 V
CI = CO = 4.7 µF

IO = 1 mA

IO = 150 mA

–15 25 125

–35 5

TA – Free-Air Temperature – ° C

45 65

85 105

Figure 2

6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS76425, TPS76427, TPS76428, TPS76430, TPS76433

LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS

SLVS180A – MARCH 1999 – REVISED JUNE 1999

TYPICAL CHARACTERISTICS

Ground Current – Aµ

1000

100

10

TPS76425

GROUND CURRENT

vs

FREE-AIR TEMPERATURE

VI = 6 V
CI = CO = 4.7 µF
IO = 0 mA and 150 mA

–35 5–15 25 125–55

TA – Free-Air Temperature – ° C

Figure 3

45 65

85 105

TPS76433

OUTPUT VOLTAGE

FREE-AIR TEMPERATURE

3.34
VI = 4.3 V

3.33

3.32

3.31

IO = 1 mA

3.3

3.29

– Output Voltage – V

O

V

3.28

IO = 150 mA

3.27

3.26

–35 5

–55 45 65

–15 25 125

TA – Free-Air Temperature – ° C

Figure 4

vs

85 105

3.3

V/ Hzµ

0.33

CO = 1 µF

Output Noise –

0.033

IO = 150 mA

VO = 3.3 V
C
TA = 25°C

0

100 1.1 k 10.1 k

(BYPASS)

OUTPUT NOISE

vs

FREQUENCY

CO = 10 µF
IO = 150 mA

= 0.1 µF

f – Frequency – Hz

Figure 5

CO = 1 µF
IO = 1 mA

CO = 10 µF
IO = 1 mA

100.1 k

OUTPUT NOISE VOLTAGE

vs

80

70

Vµ– Output Noise Voltage –

60

50

40

n

V

30

20

–3

10

BYPASS CAPACITANCE

CO = 10 µF
IO = 150 mA
f = 10 Hz to 100 kHz
TA = 25°C

–2

10

Bypass Capacitance – µF

10

–1

Figure 6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

7

TPS76425, TPS76427, TPS76428, TPS76430, TPS76433
LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS

SLVS180A – MARCH 1999 – REVISED JUNE 1999

TYPICAL CHARACTERISTICS

OUTPUT NOISE VOLTAGE

vs

70

60

Vµ– Output Noise Voltage –

50

40

30

n

V

20

10

010

LOAD CURRENT

VO = 2.5 V
CO = 10 µF
f = 10 Hz to 100 kHz
TA = 25°C

1102

Load Current – mA

Figure 7

TPS76425

DROPOUT VOLTAGE

vs

FREE-AIR TEMPERATURE

600

VI = EN = 2.7 V
CI = CO = 4.7 µF

500

OUTPUT IMPEDANCE

FREQUENCY

10

Ω

1

– Output Impedance –Z

o

0.1

0.01 10

IO = 1 mA

IO = 150 mA

CI = CO = 4.7 µF
ESR = 1 Ω
TA = 25°C

0.1 1 1000
f – Frequency – kHz

Figure 8

RIPPLE REJECTION

FREQUENCY

100

VO = 2.5 V

90

80

C

(BYPASS)

CL = 10 µF

= 0.01 µF

vs

100

TPS76425

vs

– Dropout Voltage – mV

DO

V

8

400

300

200

100

0

–55

–35 5

150 mA

0 mA

–15 25 125

TA – Free-Air Temperature – ° C

1 mA

45 65

85 105

Figure 9

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

70

60
50
40

Ripple Rejection – dB

30

20

10

0

10

IO = 1 mA

IO = 150 mA

10 M1 M100 k10 k1 k100

f – Frequency – Hz

Figure 10

TPS76425, TPS76427, TPS76428, TPS76430, TPS76433

LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS

SLVS180A – MARCH 1999 – REVISED JUNE 1999

TYPICAL CHARACTERISTICS

TPS76425

LINE TRANSIENT RESPONSE

TA = 25°C

6 V

4.7 V

50 mV

0

–50 mV

0604020 80 100 140120 160 180 200

t – Time – µs

Figure 11

TPS76433

LINE TRANSIENT RESPONSE

TA = 25°C

6 V

TPS76425

LOAD TRANSIENT RESPONSE

200 mA

TA = 25°C

100 mA

0 mA

50 mV

0

–50 mV

–100 mV

0604020 80 100 140120 160 180 200

t – Time – µs

Figure 12

TPS76433

LOAD TRANSIENT RESPONSE

200 mA

TA = 25°C

100 mA

4.7 V

100 mV

50 mV

–50 mV

0

dv
dt

0604020 80 100 140120 160 180 200

1V

+

10

µs

t – Time – µs

Figure 13

0

50 mV

0

–50 mV

–100 mV

–150 mV

0604020 80 100 140120 160 180 200

t – Time – µs

Figure 14

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

9

TPS76425, TPS76427, TPS76428, TPS76430, TPS76433
LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS

SLVS180A – MARCH 1999 – REVISED JUNE 1999

TYPICAL CHARACTERISTICS

TYPICAL REGIONS OF STABILITY

COMPENSATION SERIES RESISTANCE (CSR)

vs

OUTPUT CURRENT

100

Region of Instability

10

CO = 4.7 µF

1

0.1

CSR – Compensation Series Resistance – Ω

0.01
0 50 100 150 200 250

Region of Instability

IO – Output Current – mA

TA = 25°C

Figure 15

TYPICAL REGIONS OF STABILITY

COMPENSATION SERIES RESISTANCE (CSR)

vs

OUTPUT CURRENT

100

†

COMPENSATION SERIES RESISTANCE (CSR)

TYPICAL REGIONS OF STABILITY

†

vs

ADDED CERAMIC CAPACITANCE

100

Region of Instability

10

I = 150 mA

1

0.1

CSR – Compensation Series Resistance – Ω

0.01
0 0.1 0.2 0.3 0.4 0.5

Added Ceramic Capacitance – µF

CO = 4.7 µF
TA = 25°C

Region of Instability

0.6 0.7 0.8 0.9 1

Figure 16

†

COMPENSATION SERIES RESISTANCE (CSR)

100

TYPICAL REGIONS OF STABILITY

†

vs

ADDED CERAMIC CAPACITANCE

Region of Instability

10

1

0.1
Region of Instability

CSR – Compensation Series Resistance – Ω

0.01
0 50 100 150 200 250

IO – Output Current – mA

CO = 10 µF

10

1

0.1

CSR – Compensation Series Resistance – Ω

0.01
0 0.1 0.2 0.3 0.4 0.5

Figure 17

†

CSR refers to the total series resistance, including the ESR of the capacitor, any series resistance added externally , and PWB trace resistance
to CO.

Region of Instability

CO = 10 µF

Region of Instability

0.6 0.7 0.8 0.9 1

Added Ceramic Capacitance – µF

Figure 18

10

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS76425, TPS76427, TPS76428, TPS76430, TPS76433

LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS

SLVS180A – MARCH 1999 – REVISED JUNE 1999

APPLICATION INFORMATION

The TPS764xx family of low-noise and low-dropout (LDO) regulators are optimized for use in battery-operated
equipment. They feature extremely low noise (50 µV), low dropout voltages, low quiescent current (140 µA),
and an enable input to reduce supply current to less than 2 µA when the regulator is turned off.

device operation

The TPS764xx 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
which, unlike a PNP transistor, does not require increased drive current as output current increases. Supply
current in the TPS764xx 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 1 A; 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 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 diode that safely conducts reverse current
when the input voltage level drops below the output voltage level.

An internal resistor, in conjunction with external 0.01-µF bypass capacitor, creates a low-pass filter to further
reduce the noise. The TPS764xx exhibits only 50 µV of output voltage noise using 0.01 µF bypass and 4.7-µF
output capacitors.

A logic low on the enable input, EN, shuts off the output and reduces the supply current to less than 2 µA. EN
should be tied high in applications where the shutdown feature is not used.

A typical application circuit is shown in Figure 22.

OUT

BYPASS

GND

2

†

5

4

+

0.01 µF

V

O

+

4.7 µF

CSR = 1 Ω

TPS764xx

1

V

I

C1

1 µF

†

TPS76425, TPS76427 TPS76430, TPS76433.

IN

3

EN

Figure 19. Typical Application Circuit

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

11

TPS76425, TPS76427, TPS76428, TPS76430, TPS76433
LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS

SLVS180A – MARCH 1999 – REVISED JUNE 1999

APPLICATION INFORMATION

external capacitor requirements

Although not required, a 0.047-µF or larger ceramic bypass input capacitor , connected between IN and GND
and located close to the TPS764xx, 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 TPS764xx requires an output capacitor connected between OUT and GND
to stabilize the internal loop control. The minimum recommended capacitance value is 4.7 µF and the ESR
(equivalent series resistance) must be between 0.2 Ω and 10 Ω. Capacitor values 4.7 µF or larger are
acceptable, provided the ESR is less than 10 Ω . 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 previously stated. Multilayer ceramic capacitors should have
minimum values of 1 µF over the full operating temperature range of the equipment.

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. Listings are sorted by height.

†

SIZE (H × L × W)

†

12

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS76425, TPS76427, TPS76428, TPS76430, TPS76433

LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS

SLVS180A – MARCH 1999 – REVISED JUNE 1999

APPLICATION INFORMATION

power dissipation and junction temperature

Specified regulator operation is assured to a junction temperature of 125°C; the maximum junction temperature
allowable without damaging the device is 150°C. 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, P
P

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

D(max)

.

, and the actual dissipation, PD, which must be less than or equal to

D(max)

P

D(max)

Where

T

max is the maximum allowable junction temperature

J

R

θJA

SOT23.

is the ambient temperature.

T

A

The regulator dissipation is calculated using:

PD+

Power dissipation resulting from quiescent current is negligible.

TJmax*T

+

R

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

ǒ

VI*

Ǔ

V

O

A

q

JA

I

O

regulator protection

The TPS764xx pass element has a built-in back diode that safely 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 is anticipated, external limiting might be
appropriate.

The TPS764xx also features internal current limiting and thermal protection. During normal operation, the
TPS764xx limits output current to approximately 800 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 165°C, thermal-protection circuitry shuts it down. Once the device has
cooled down to below 140°C, regulator operation resumes.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

13

TPS76425, TPS76427, TPS76428, TPS76430, TPS76433
LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS

SLVS180A – MARCH 1999 – REVISED JUNE 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

14

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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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
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DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
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In order to minimize risks associated with the customer’s applications, adequate design and operating
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TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
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Copyright  1999, Texas Instruments Incorporated