TPS76425, TPS76427, TPS76428, TPS76430, TPS76433

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

SLVS180B – MARCH 1999 – REVISED MAY 2001

11

POST OFFICE BOX 655303

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.

CAPACITOR SELECTION

PART NO.

MFR.

VALUE

MAX ESR†

SIZE (H

× L × W)†

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.