MAX1982_08 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – Low-Voltage, Low-Dropout Linear Regulators with External Bias Supply

19-2560; Rev 1; 10/08
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
Typical Operating Circuit
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 ^PIN-
PACKAGE
TOP
MARK
MAX1982EUT-T -40°C to +85°C 6 SOT23-6 ABEA
MAX1983EUT-T -40°C to +85°C 6 SOT23-6 ABEB
MAX1982EUT+T -40°C to +85°C 6 SOT23-6 ABEA+
MAX1983EUT+T -40°C to +85°C 6 SOT23-6 ABEB+
+Denotes lead(Pb)-free package/RoHS-compliant package.
Pin Configurations
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
TOP VIEW
BIAS 1
6 IN
GND 2 ^MAX1982 5 OUT
SHDN 3
4 PGOOD
SOT23
Fixed Output Voltage
BIAS 1
6 IN
GND 2 ^MAX1983 5 OUT
SHDN 3
4 ADJ
SOT23
Adjustable Output
________________________________________________________________ Maxim Integrated Products 1
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or visit Maxim’s website at www.maxim-ic.com.