Datasheet ADP122, ADP123 (Analog Devices)

5.5 V Input, 300 mA, Low Quiescent Current, CMOS Linear Regulator Data Sheet ADP122/ ADP123 FEATURES TYPICAL APPLICATION CIRCUITS Input voltage supply range: 2.3 V to 5.5 V VIN = 2.3V TO 5.5V VOUT = 1.8V 300 mA maximum output current 1 VIN VOUT 5 C C Fixed and adjustable output voltage versions IN OUT 1µF ADP122 1µF Very low dropout voltage: 85 mV at 300 mA load 2 GND Low quiescent current: 45 µA at no load ON Low shutdown current: <1 µA 3 EN NC 4
001
OFF Initial accuracy: ±1% accuracy
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Up to 31 fixed-output voltage options available from
Figure 1. ADP122 with Fixed Output Voltage (TSOT Version)
1.75 V to 3.3 V V Adjustable-output voltage range IN = 2.3V TO 5.5V VOUT = 0.5V(1 + R1/R2) 1 VIN VOUT 5 0.8 V to 5.0 V (ADP123) CIN COUT 1µF ADP123 1µF Excellent PSRR performance: 60 dB at 100 kHz R1 2 GND Excellent load/line transient response Optimized for small 1.0 μF ceramic capacitors ON 3 EN ADJ 4 Current limit and thermal overload protection OFF R2 Logic controlled enable
002
Compact packages: 5-lead TSOT and 6-lead 2 mm × 2 mm LFCSP
08399- Figure 2. ADP123 with Adjustable Output Voltage (TSOT Version)
APPLICATIONS VOUT = 1.8V 1 6 VIN = 2.3V TO 5.5V Digital camera and audio devices VOUT VIN C2 C1 1µF 1µF Portable and battery-powered equipment GND 2 NC NC 5 GND Automatic meter reading (AMR) meters 3 4 ON GPS and location management units GND EN OFF Medical instrumentation GND ADP122 Point-of-sale equipment TOP VIEW (Not to Scale)
135
GENERAL DESCRIPTION NC = NOT CONNECT. THIS PIN CAN BE LEFT FLOATING
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OR CONNECTED TO GROUND.
The ADP122/ADP123 are low quiescent current, low dropout Figure 3. ADP122 with Fixed Output Voltage (LFCSP Version) linear regulators. They are designed to operate from an input
VOUT = 0.5V (1 + R1/R2) 1 6 VIN = 2.3V TO 5.5V
voltage between 2.3 V and 5.5 V and to provide up to 300 mA of
VOUT VIN C2 C1
output current. The low 85 mV dropout voltage at a 300 mA load
1µF R1 1µF 2 GND ADJ NC 5 GND
improves efficiency and al ows operation over a wide input
R2 3 4 ON
voltage range.
GND GND EN OFF
The low 170 μA of quiescent current at ful load makes the ADP122
GND ADP123
ideal for battery-operated portable equipment.
TOP VIEW (Not to Scale)
136 The ADP122 is capable of 31 fixed output voltages from 1.75 V
NC = NOT CONNECT. THIS PIN CAN BE LEFT FLOATING
08399-
OR CONNECTED TO GROUND.
to 3.3 V. The ADP123 is the adjustable version of the device and Figure 4. ADP123 with Adjustable Output Voltage (LFCSP Version) al ows the output voltage to be set between 0.8 V and 5.0 V by The ADP122/ADP123 have an internal soft start that gives a an external voltage divider. constant start-up time of 350 µs. Short-circuit protection and The ADP122/ADP123 are specifical y designed for stable operation thermal overload protection circuits prevent damage in adverse with tiny 1 µF ceramic input and output capacitors to meet the conditions. The ADP122/ADP123 are available in a tiny, 5-lead requirements of high performance, space constrained applications. TSOT package and 6-lead LFCSP package for the smallest footprint solution to meet a variety of portable applications.
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Document Outline Features Applications General Description Typical Application Circuits Revision History Specifications Recommended Specifications Absolute Maximum Ratings Thermal Data Thermal Resistance ESD Caution Pin Configurations and Function Descriptions Typical Performance Characteristics Theory of Operation Applications Information Capacitor Selection Output Capacitor Input Bypass Capacitor Input and Output Capacitor Properties Undervoltage Lockout Enable Feature Current Limit and Thermal Overload Protection Thermal Considerations Junction Temperature Calculations For TSOT Package Junction Temperature Calculations For LFCSP Package Printed Circuit Board Layout Considerations Outline Dimensions Ordering Guide