Datasheet ADP5300 (Analog Devices)

50 mA/500 mA, High Efficiency, Ultralow Power Step-Down Regulator Data Sheet ADP5300 FEATURES TYPICAL APPLICATION CIRCUIT Input supply voltage range: 2.15 V to 6.50 V V 2.2µH IN = 2.15 TO 6.50V VOUT Operates down to 2.00 V voltage PVIN SW 10µF Ultralow 180 nA quiescent current ADP5300 10µF Selectable output voltage of 0.8 V to 5.0 V ON PGND OFF EN ±1.5% output accuracy over full temperature range in PWM PWM mode SYNC/MODE FB HYS Selectable hysteresis mode or PWM operation mode STOP VID0: 1.2V VID8: 2.5V VOUTOK VID1: 1.5V VID9: 2.6V Output current SW STOP VID2: 1.8V VID10: 2.7V AGND VID VID3: 2.0V VID11: 2.8V Up to 50 mA in hysteresis mode VID4: 2.1V VID12: 2.9V R0 EPAD VID5: 2.2V VID13: 3.0V Up to 500 mA in PWM mode VID6: 2.3V VID14: 3.3V
001
VID7: 2.4V VID15: 3.6V VOUTOK flag monitors the output voltage
13366-
Ultrafast stop switching control
Figure 1.
100% duty cycle operation mode 2.0 MHz typical switching frequency in PWM mode with optional SYNC clock range 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 −40°C to +125°C operating temperature range APPLICATIONS Energy (gas and water) metering Portable and battery-powered equipment Medical applications Keep-alive power supplies GENERAL DESCRIPTION
The ADP5300 is a high efficiency, ultralow quiescent current The ADP5300 contains a VOUTOK flag, which monitors the step-down regulator that draws only 180 nA quiescent current output voltage and runs at a 2 MHz switching frequency in to regulate the output. PWM mode. SYNC/MODE can be synchronized to an external The ADP5300 runs from an input supply voltage range of 2.15 V clock from 1.5 MHz to 2.5 MHz. to 6.50 V, al owing the use of multiple alkaline or NiMH, Li-Ion The ADP5300 includes an STOP pin that can disable the regulator cells, or other power sources. The output voltage is selectable from switching temporarily, in this way a quiet system environment 0.8 V to 5.0 V by an external VID resistor and factory fuse. The can be achieved to benefit noise sensitive circuitry, such as data total solution requires only four tiny external components. conversion, RF data transmisson, and analog sensing. The ADP5300 can operate between hysteresis mode and pulse- Other key features in the ADP5300 include separate enabling, width modulation (PWM) mode via the SYNC/MODE pin. The QOD, and safety features such as overcurrent protection (OCP), regulator in hysteresis mode achieves excel ent efficiency at a thermal shutdown (TSD), and input undervoltage lockout (UVLO). power of less than 1 mW and provides up to 50 mA of output The ADP5300 is available in a 10-lead, 3 mm × 3 mm LFCSP current. The regulator in PWM mode produces a lower output rated for a −40°C to +125°C operating temperature range. ripple and supplies up to 500 mA of output current. The flexible configuration capability during operation of the device enables Multifunction pin names may be referenced by their relevant very efficient power management to meet both the longest bat ery function only. 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 OSILLATOR 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 VOUTOK 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 CIRCUIT BOARD LAYOUT RECOMMENDATIONS TYPICAL APPLICATION CIRCUITS FACTORY PROGRAMMABLE OPTIONS OUTLINE DIMENSIONS ORDERING GUIDE