TPS76901, TPS76912, TPS76915, TPS76918, TPS76925

TPS76927, TPS76928, TPS76930, TPS76933, TPS76950

ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS

SLVS203D – JUNE 1999 – REVISED APRIL 2000

12

POST OFFICE BOX 655303

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 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

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.

CAPACITOR SELECTION

PART NO.

MFR.

VALUE

SIZE (H

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.