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DA9485.001
7 March, 2001
MAS9485
LDO Voltage Regulator IC
• 100mA Very Low Dropout Voltage
Regulator
• Low Noise
• Regulator Enable/Disable Control
• Stable Even with Low -ESR Output
Capacitor
DESCRIPTION
The MAS9485 is a low dropout voltage regulator
with an enable/disable pin, which allows device to
be turned off or on by pulling control to low or high.
Due to the low noise level of only 30 µVrms,
MAS9485 is suitable for sensitive circuits, e.g., in
portable applications. In addition to the noise levels,
MAS9485 excels in dropout voltage (150 mV typical
at 100 mA) and rise time (15 µs typical without
bypass capacitor.
A very wide range of values of Equivalent Series
Resistance (ESR) of output capacitors c an be used
with MAS9485. This ESR range from a few mΩ up
to a couple of ten Ohms combined with no minimum
output current requirement makes the usage of
MAS9485 easier and low in cost.
In order to save power the device goes into sleep
mode when the regulator is disabled. An internal
thermal protection circuit prevents the device from
overheating. Also the maximum output current is
internally limited.
FEATURES APPLICATION
• Output Accuracy <±2%
• Low Noise
• Internal Thermal Shutdown
• Short Circuit Protection
• SOT23-5 Package
• Pin Compatible with LP2985
• Output Voltage Options: 3.3 V, 2.8 V, and 2.4 V
• Cellular Phones
• Cordless Phones
• Pagers
• Battery Powered Systems
• Portable Systems
• Radio Control Systems
• Low Voltage Systems
PIN CONFIGURATION AND DESCRIPTION
Pin Name Pin Type Function
VIN 1 P Power Supply Voltage
GND 2 G Ground
CTRL 3 I Enable/Disable Pin for
Regulator (push down)
BYPASS 4 I Pin for Bypass
Capacitor
VOUT 5 O Output
123
45
VIN
VOUT
CTRLGND
BYPASS
Top View
G = Ground, I = Input, O = Output, P = Power
For Top Marking Information see
p. 9 Ordering Information