Datasheet ADP124, ADP125 (Analog Devices)

5.5 V Input, 500 mA, Low Quiescent Current, CMOS Linear Regulators Data Sheet ADP124/ ADP125 FEATURES TYPICAL APPLICATION CIRCUITS Input voltage supply range: 2.3 V to 5.5 V 500 mA maximum output current 1 VOUT VIN 8 VOUT = 3.3V VIN = 5.5V ADP124 Fixed and adjustable output voltage versions 2 VOUT VIN 7 C2 C1 1% initial accuracy VOUT Up to 31 fixed-output voltage options available 3 NC SENSE 6 from 1.75 V to 3.3 V ON 4 5 GND EN
001
Adjustable-output voltage range from 0.8 V to 5.0 V OFF
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Very low dropout voltage: 130 mV
Figure 1. ADP124 with Fixed Output Voltage
Low quiescent current: 45 µA Low shutdown current: <1 µA VOUT = 3.3V Excellent PSRR performance: 60 dB at 100 kHz 1 VOUT VIN 8 VIN = 5.5V Excellent load/line transient response ADP125 2 VOUT VIN 7 Optimized for small 1.0 μF ceramic capacitors C2 R1 C1 Current limit and thermal overload protection 3 ADJ NC 6 Logic controlled enable R2 ON Compact 8-lead exposed paddle MSOP and LFCSP packages 4 5 GND EN
002
OFF
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APPLICATIONS
Figure 2. ADP125 with Adjustable Output Voltage
Digital camera and audio devices Portable and battery-powered equipment Automatic meter reading (AMR) meters GPS and location management units Medical instrumentation Point of load power GENERAL DESCRIPTION
The ADP124/ADP125 are low quiescent current, low dropout The ADP124/ADP125 are specifical y designed for stable linear regulators. They are designed to operate from an input operation with tiny 1 µF ceramic input and output capacitors to voltage between 2.3 V and 5.5 V and to provide up to 500 mA meet the requirements of high performance, space constrained of output current. The low 130 mV dropout voltage at a 500 mA applications. load improves efficiency and al ows operation over a wide input The ADP124/ADP125 have an internal soft start that gives a voltage range. constant start-up time of 350 µs. Short-circuit protection and The low 210 μA of quiescent current with a 500 mA load makes the thermal overload protection circuits prevent damage in adverse ADP124/ADP125 ideal for battery-operated portable equipment. conditions. The ADP124/ADP125 are available in 8-lead The ADP124 is capable of 31 fixed-output voltages from 1.75 V exposed paddle MSOP and LFCSP packages. When compared to 3.3 V. The ADP125 is the adjustable version of the device and with the standard MSOP and LFCSP packages, the exposed allows the output voltage to be set between 0.8 V and 5.0 V by paddle MSOP and LFCSP packages have lower thermal resistance an external voltage divider. (θJA). The lower thermal resistance package allows the ADP124/ ADP125 to meet the needs of a variety of portable applications while minimizing the rise in junction temperature.
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Document Outline FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUITS GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS RECOMMENDED CAPACITOR 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 PRINTED CIRCUIT BOARD LAYOUT CONSIDERATIONS OUTLINE DIMENSIONS ORDERING GUIDE