Datasheet ADP2147 (Analog Devices) - 5

ADP2147 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS BALL A1 INDICATOR 1 2 VIN EN A SW VSEL B GND VOUT C ADP2147 TOP VIEW
2 00
(BALL SIDE DOWN)
5-
Not to Scale
88 09 Figure 2. Pin Configuration (Top View)
Table 5. Pin Function Descriptions Pin No. Mnemonic Description
A1 VIN Power Source Input. VIN is the source of the pFET high-side switch. Bypass VIN to GND with a 4.7 μF or greater capacitor as close to the ADP2147 as possible. B1 SW Switch Node Output. SW is the drain of the P-channel MOSFET switch and N-channel synchronous rectifier. Connect the output LC filter between SW and the output voltage. C1 GND Ground. Connect the input and output capacitors to GND. A2 EN Buck Activation. To turn on the buck, set EN to high. To turn off the buck, set EN to low. B2 VSEL Voltage Select Input for Simple Dynamic Voltage Scaling (DVS). Drive VSEL low to switch the VOUT pin to the default voltage setting. Drive VSEL high to switch VOUT to the alternate voltage setting. C2 VOUT Output Voltage Sensing Input. Rev. 0 | Page 5 of 16 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL APPLICATIONS CIRCUIT TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS INPUT AND OUTPUT CAPACITOR, RECOMMENDED SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL DATA THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CONTROL SCHEME PWM MODE POWER SAVE MODE Power Save Mode Current Threshold ENABLE/SHUTDOWN SIMPLE DYNAMIC VOLTAGE SCALING (DVS) SHORT-CIRCUIT PROTECTION UNDERVOLTAGE LOCKOUT THERMAL PROTECTION SOFT START CURRENT LIMIT 100% DUTY OPERATION APPLICATIONS INFORMATION EXTERNAL COMPONENT SELECTION Inductor Output Capacitor THERMAL CONSIDERATIONS PCB LAYOUT GUIDELINES EVALUATION BOARD EVALUATION BOARD LAYOUT OUTLINE DIMENSIONS ORDERING GUIDE