Datasheet ADP5302 (Analog Devices)

50 mA/500 mA, Ultralow Power Step-Down Regulator With Battery Voltage Monitor Data Sheet ADP5302 FEATURES TYPICAL APPLICATION CIRCUIT Input supply voltage range: 2.15 V to 6.50 V VIN = 2.2µH 2.15V TO 6.50V V Operates down to 2.00 V OUT PVIN SW Ultralow 240 nA quiescent current with no load 10µF ADP5302 10µF Selectable output voltages of 1.2 V to 3.6 V, or 0.8 V to 5.0 V (LFCSP-10) ON ±1.5% output accuracy over the full temperature range in PGND OFF EN pulse-width modulation (PWM) mode PWM Selectable hysteresis mode or PWM operation mode SYNC/ FB
1
HYS
0
MODE
0
Output current
3- 44
STOP
13
Up to 50 mA in hysteresis mode SW STOP VINOK VID0: 1.2V VID8: 2.5V Up to 500 mA in PWM mode VID1: 1.5V VID9: 2.6V VID2: 1.8V VID10: 2.7V AGND VID VINOK flag to monitor input battery voltage VID3: 2.0V VID11: 2.8V R0 VID4: 2.1V VID12: 2.9V Ultrafast stop switching control EPAD VID5: 2.2V VID13: 3.0V VID6: 2.3V VID14: 3.3V 100% duty cycle operation mode VID7: 2.4V VID15: 3.6V 2 MHz switching frequency with optional synchronization
Figure 1.
input from 1.5 MHz to 2.5 MHz Quick output discharge (QOD) option UVLO, OCP, and TSD protection 10-lead, 3 mm × 3 mm LFCSP package Junction temperature: −40°C to +125°C APPLICATIONS Energy (gas, water) metering Portable and battery-powered equipment Medical applications Keep-alive power supplies GENERAL DESCRIPTION
The ADP5302 is a high efficiency, ultralow quiescent current The ADP5302 integrates an ultralow power comparator with a step-down regulator that draws only 240 nA quiescent current factory programmable voltage reference to monitor the input to regulate the output at no load. battery voltage. The regulator runs at a 2 MHz switching The ADP5302 runs from an input voltage of 2.15 V to 6.50 V, frequency in PWM mode, and the SYNC/MODE pin can be allowing the use of multiple alkaline or NiMH cells, Li-Ion cells, synchronized to an external clock from 1.5 MHz to 2.5 MHz. or other power sources. The output voltage is selectable from 0.8 V The ADP5302 includes an extra STOP pin that can temporarily to 5.0 V by an external VID resistor and a factory fuse. The total disable the regulator switching; in this way, a quiet system environ- solution requires only four tiny external components. ment can be achieved to benefit the noise sensitive circuitry, which The ADP5302 can operate between hysteresis mode and PWM includes data conversion, RF data transmission, and analog sensors. mode via the SYNC/MODE pin. In hysteresis mode, the regulator Other key features in the ADP5302 include separate enabling, achieves excellent efficiency at less than 1 mW and provides up to QOD, and safety features, such as overcurrent protection 50 mA of output current. In PWM mode, the regulator produces a (OCP), thermal shutdown (TSD), and input undervoltage lower output ripple and supplies up to 500 mA of output current. lockout (UVLO). The flexible configuration capability during operation of the The ADP5302 is available in a 10-lead, 3 mm × 3 mm LFCSP device enables very efficient power management to meet both package rated for the −40°C to +125°C junction temperature range. long battery life and low system noise requirements.
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Document Outline FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUIT GENERAL DESCRIPTION REVISION HISTORY DETAILED FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION BUCK REGULATOR OPERATIONAL MODES PWM Mode Hysteresis Mode Mode Selection OSCILLATOR AND SYNCHRONIZATION ADJUSTABLE AND FIXED OUTPUT VOLTAGES UNDERVOLTAGE LOCKOUT (UVLO) ENABLE/DISABLE CURRENT LIMIT SHORT-CIRCUIT PROTECTION SOFT START STARTUP WITH PRECHARGED OUTPUT 100% DUTY OPERATION ACTIVE DISCHARGE VINOK FUNCTION STOP SWITCHING THERMAL SHUTDOWN APPLICATIONS INFORMATION EXTERNAL COMPONENT SELECTION SELECTING THE INDUCTOR OUTPUT CAPACITOR INPUT CAPACITOR EFFICIENCY Power Switch Conduction Losses Inductor Losses Driver Losses Transition Losses PRINTED CIRCUIT BOARD LAYOUT RECOMMENDATIONS TYPICAL APPLICATION CIRCUITS FACTORY PROGRAMMABLE OPTIONS OUTLINE DIMENSIONS ORDERING GUIDE