CMOS Linear Regulator - Analog Devices
Description
Data Sheet
5.
5 V Input, 300 mA, Low Quiescent Current, CMOS Linear Regulator ADP122/ADP123
FEATURES
Input voltage supply range: 2.
3 V to 5.
5 V 300 mA maximum output current Fixed and adjustable output voltage versions Very low dropout voltage: 85 mV at 300 mA load Low quiescent current: 45 µA at no load Low shutdown current: <1 µA Initial accuracy: ±1% accuracy Up to 31 fixed-output voltage options available from
1.
75 V to 3.
3 V Adjustable-output voltage range
0.
8 V to 5.
0 V (ADP123) Excellent PSRR performance: 60 dB at 100 kHz Excellent load/line transient response Optimized for small 1.
0 μF ceramic capacitors Current limit and thermal overload protection Logic controlled enable Compact packages: 5-lead TSOT and 6-lead 2 mm × 2 mm LFCSP
APPLICATIONS
Digital camera and audio devices Portable and battery-powered equipment Automatic meter reading (AMR) meters GPS and location management units Medical instrumentation Point-of-sale equipment
GENERAL DESCRIPTION
The ADP122/ADP123 are low quiescent current, low dropout linear regulators.
They are designed to operate from an input voltage between 2.
3 V and 5.
5 V and to provide up to 300 mA of output current.
The low 85 mV dropout voltage at a 300 mA load improves efficiency and allows operation over a wide input voltage range.
The low 170 μA of quiescent current at full load makes the ADP122 ideal for battery-operated portable equipment.
The ADP122 is capable of 31 fixed output voltages from 1.
75 V to 3.
3 V.
The ADP123 is the adjustable version of the device and allows the output voltage to be set between 0.
8 V and 5.
0 V by an external voltage divider.
The ADP122/ADP123 are specifically designed for stable operation with tiny 1 µF ceramic input and output capacitors to meet the requirements of high performance, space constrained applications.
TYPICAL APPLICATION CIRCUITS
VIN = 2.
3V TO 5.
5V
CIN 1µF
1 VIN VOUT 5
ADP122
2 GND
VOUT = 1.
8V
COUT 1µF
08399-001
ON OFF
3 EN
NC 4
Figure 1.
ADP122 with Fixed Output Voltage...
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