MAX1982 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – Low-Voltage, Low-Dropout Linear Regulators with External Bias Supply

19-2560; Rev 0; 7/02
EVAALVUAAILTAIOBNLEKIT
Low-Voltage, Low-Dropout Linear Regulators
with External Bias Supply
General Description
The MAX1982/MAX1983 are low-voltage, low-dropout
linear regulators with an external bias supply input. The
5V bias supply drives the gate of the internal N-channel
pass transistor, making these devices ideal for applica-
tions that require low-voltage outputs from low-voltage
inputs. The MAX1982 delivers 1.2V (±3%) at 300mA
from an input voltage of 1.25V to 5.5V. The MAX1983
delivers an adjustable output voltage from 0.8V to 2V.
The MAX1982/MAX1983 include a current-limit and
thermal shutdown that protects the regulator in the
event of a fault condition. Both devices are offered in a
6-pin SOT23 package and are specified over the
extended (-40°C to +85°C) temperature range.
Applications
Notebook Computers
VID Power Supplies
PDAs
Cell Phones
Low-Dropout Regulators with External Bias
Supply
Features
o Low-Cost 1.2V, 300mA VID Supply
o ±3% Output Voltage Accuracy
o No Minimum Load Current Required
o 1.25V to 5.5V Input Supply Voltage
o 5V Input Bias Supply Voltage
o Power-Good (PGOOD) Open-Drain Output with
1ms Rising Edge Propagation Delay (MAX1982)
o Adjustable Output Voltage (MAX1983)
o Low Supply Current (I_BIAS + I_IN = 165µA typ)
o 5µA (max) Shutdown Supply Current
o Tiny 6-Pin SOT23 Package
Ordering Information
PART
TEMP RANGE
MAX1982EUT-T -40°C to +85°C
MAX1983EUT-T -40°C to +85°C
PIN-
PACKAGE
6 SOT23-6
6 SOT23-6
TOP
MARK
ABEA
ABEB
Typical Operating Circuit
4.5V TO 5.5V
BIAS
IN
MAX1982
0.1µF
GND
OUT
ON
OFF
SHDN
PGOOD
1.25V TO 5.5V
10µF
1.2V
10µF
PGOOD
100kΩ
Pin Configurations
TOP VIEW
BIAS 1
6 IN
GND 2 ^MAX1982 5 OUT
SHDN 3
4 PGOOD
SOT23-6
Fixed Output Voltage
BIAS 1
6 IN
GND 2 ^MAX1983 5 OUT
SHDN 3
4 ADJ
SOT23-6
Adjustable Output
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