MAX603/MAX604
5V/3.3V or Adjustable, Low-Dropout,
Low I , 500mA Linear Regulators
Q
General Description
Features
The MAX603/MAX604 low-dropout, low quiescent current,
linear regulators supply 5V, 3.3V, or an adjustable output
for currents up to 500mA. They are available in a 1.8W SO
package. Typical dropouts are 320mV at 5V and 500mA,
or 240mV at 3.3V and 200mA. Quiescent currents are
15μA typ and 35μA max. Shutdown turns off all circuitry
and puts the regulator in a 2μA off mode. A unique protection
scheme limits reverse currents when the input voltage falls
below the output. Other features include foldback current
limiting and thermal overload protection.
● 500mA Output Current, with Foldback Current
Limiting
● High-Power (1.8W) 8-Pin SO Package
● Dual Mode™ Operation: Fixed or Adjustable Output
from 1.25V to 11V
● Large Input Range (2.7V to 11.5V)
● Internal 500mA P-Channel Pass Transistor
● 15μA Typical Quiescent Current
● 2μA (Max) Shutdown Mode
The output is preset at 3.3V for the MAX604 and 5V
for the MAX603. In addition, both devices employ Dual
Mode™ operation, allowing user-adjustable outputs from
1.25V to 11V using external resistors. The input voltage
supply range is 2.7V to 11.5V.
● Thermal Overload Protection
● Reverse-Current Protection
Applications
The MAX603/MAX604 feature a 500mA P-channel
MOSFET pass transistor. This transistor allows the devices
to draw less than 35μA over temperature, independent
of the output current. The supply current remains low
because the P-channel MOSFET pass transistor draws
no base currents (unlike the PNP transistors of conventional
bipolar linear regulators). Also, when the input-to-output
voltage differential becomes small, the internal P-channel
MOSFET does not suffer from excessive base current
losses that occur with saturated PNP transistors.
● 5V and 3.3V Regulators
● 1.25V to 11V Adjustable Regulators
● Battery-Powered Devices
● Pagers and Cellular Phones
● Portable Instruments
● Solar-Powered Instruments
Ordering Information appears at end of data sheet.
Typical Operating Circuit
Pin Configuration
TOP VIEW
OUTPUT
VOLTAGE
OUT
MAX603
IN
IN
GND
GND
OFF
OUT
GND
GND
SET
MAX604
1
2
3
4
8
7
6
5
MAX603
MAX604
OFF
C
10µF
OUT
C
10µF
BATTERY
IN
GND
SET
DIP/SO
Dual Mode is a trademark of Maxim Integrated Products.
19-0269; Rev 1; 4/17