Rainbow Electronics MAX15030 - Manual (Page 7)

MAX15029/MAX15030
1.425V to 3.6V Input, 500mA Low-Dropout
Regulators with BIAS Input
_______________________________________________________________________________________ 7
Functional Diagram
INTERNAL
SUPPLY
GENERATOR
BIAS
UVLO
IN
UVLO
CONTROL
LOGIC
P
REF
ERROR
AMPLIFIER
WITH
SOFT-START
OVERTEMPERATURE
PROTECTION
MOS DRIVER
WITH I LIMIT
BIAS
IN
EN
FB
SS
OUT
GND
MAX15030
ONLY
MAX15029
ONLY
REF
MAX15029
MAX15030
Detailed Description
The MAX15029/MAX15030 low-dropout linear regula-
tors operate from input voltages as low as 1.425V and
deliver up to 500mA of continuous output current with a
maximum dropout voltage of only 150mV.
The MAX15030 operates with an input voltage as low
as 1.425V if the bias voltage (V
BIAS
) of 3V to 5.5V is
available. The power is applied at IN while the control
is provided through BIAS input. The current drawn by
BIAS is negligible when the LDO goes into the shut-
down. This feature is especially useful in automotive
applications where the BIAS input is derived from an
always-on LDO that expects to provide minimal power
during the key-off condition.
The pMOS output stage can be driven from input volt-
ages down to +1.425V without sacrificing stability or
transient performance. The output voltage of all the
regulators is adjustable from 0.5V to V
IN
and is ±2%
accurate over load and line variations, from -40°C to
+125°C. Since these regulators have a pMOS output
device, supply current is not a significant function of
load or input headroom.