Datasheet ADM7172 (Analog Devices) - 6

ADM7172 Data Sheet PIN CONFIGURATION AND FUNCTION DESCRIPTIONS VOUT 1 8 VIN VOUT 2 7 VIN ADM7172 SENSE 3 TOP VIEW 6 GND (Not to Scale) SS 4 5 EN NOTES 1. THE EXPOSED PAD ENHANCES THERMAL PERFORMANCE AND IS ELECTRICALLY CONNECTED TO GND INSIDE THE
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PACKAGE. CONNECT THE EXPOSED PAD TO THE GROUND PLANE ON THE BOARD TO ENSURE PROPER OPERATION.
12250- Figure 3. Pin Configuration
Table 6. Pin Function Descriptions Pin No. Mnemonic Description
1 VOUT Regulated Output Voltage. Bypass this pin to GND with a 4.7 µF or greater capacitor. 2 VOUT Regulated Output Voltage. This pin is internally connected to Pin 1. 3 SENSE Sense Input. Connect this pin as close as possible to the load for best load regulation. Use an external resistor divider to set the output voltage higher than the fixed output voltage. 4 SS Soft Start. A 1 nF external capacitor connected to SS results in a 1.0 ms start-up time. 5 EN Regulator Enable. Drive EN high to turn on the regulator; drive EN low to turn off the regulator. For automatic startup, connect EN to VIN (Pin 7 or Pin 8). 6 GND Ground. 7 VIN Regulator Input Supply. Bypass this pin to GND with a 4.7 µF or greater capacitor. 8 VIN Regulator Input Supply. This pin is internally connected to Pin 7. 9 EP Exposed Pad. The exposed pad is on the bottom of the package. The exposed pad enhances thermal performance and is electrically connected to GND inside the package. Connect the exposed pad to the ground plane on the board to ensure proper operation. Rev. D | Page 6 of 23 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION 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 APPLICATIONS INFORMATION ADISIMPOWER DESIGN TOOL CAPACITOR SELECTION Output Capacitor Input Bypass Capacitor Input and Output Capacitor Properties PROGRAMMABLE PRECISION ENABLE UNDERVOLTAGE LOCKOUT SOFT START NOISE REDUCTION OF THE ADM7172 IN ADJUSTABLE MODE EFFECT OF NOISE REDUCTION ON START-UP TIME CURRENT-LIMIT AND THERMAL OVERLOAD PROTECTION THERMAL CONSIDERATIONS TYPICAL APPLICATIONS CIRCUITS PRINTED CIRCUIT BOARD LAYOUT CONSIDERATIONS OUTLINE DIMENSIONS ORDERING GUIDE