Bypass (BYP)

The capacitor connected from BYP to OUT filters the

noise of the reference, feedback resistors, and regula-

tor input stage and provides a high-speed feedback

path for improved transient response. A 0.01µF capaci-

tor rolls off input noise at approximately 32Hz.

The slew rate of the output voltage during startup is

also determined by the BYP capacitor. A 0.01µF

capacitor sets the slew rate to 5V / ms. This startup rate

results in a 50mA slew current drawn from the input at

startup to charge the 10µF output capacitance.

Low-Noise 500mA LDO Regulators

in a 2mm x 2mm TDFN Package

6

_______________________________________________________________________________________

VOLTAGE

SELECT

SELA

SELB

990k

Ω

OUTS

EA

BYP

OUT

GND

REF

0.6V

BYP

MAX8902A ONLY

FB

CONTROL

EN

THERMAL

PROTECTION

POK

IN

CURRENT

LIMIT

REVERSE

CURRENT

PROTECTION

MAX8902B ONLY

0.54V

MAX8902A

MAX8902B

Figure 1. Simplified Functional Diagram