Datasheet ADP1611 (Analog Devices) - 5

ADP1611 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS COMP 1 8 SS FB ADP1611 2 7 RT TOP VIEW SD 3 6 IN (Not to Scale) GND 4 5 SW
04906-0-003 Figure 3. Pin Configuration
Table 3. Pin Function Descriptions Pin No. Mnemonic Description
1 COMP Compensation Input. Connect a series resistor-capacitor network from COMP to GND to compensate the regulator. 2 FB Output Voltage Feedback Input. Connect a resistive voltage divider from the output voltage to FB to set the regulator output voltage. 3 SD Shutdown Input. Drive SD low to shut down the regulator; drive SD high to turn it on. 4 GND Ground. 5 SW Switching Output. Connect the power inductor from the input voltage to SW and connect the external rectifier from SW to the output voltage to complete the step-up converter. 6 IN Main Power Supply Input. IN powers the ADP1611 internal circuitry. Connect IN to the input source voltage. Bypass IN to GND with a 10 µF or greater capacitor as close to the ADP1611 as possible. 7 RT Frequency Setting Input. RT controls the switching frequency. Connect RT to GND to program the oscillator to 700 kHz, or connect RT to IN to program it to 1.2 MHz. 8 SS Soft-Start Timing Capacitor Input. A capacitor from SS to GND brings up the output slowly at power-up. Rev. 0 | Page 5 of 20 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CURRENT-MODE PWM OPERATION FREQUENCY SELECTION SOFT START ON/OFF CONTROL SETTING THE OUTPUT VOLTAGE INDUCTOR SELECTION CHOOSING THE INPUT AND OUTPUT CAPACITORS DIODE SELECTION LOOP COMPENSATION SOFT-START CAPACITOR APPLICATION CIRCUITS STEP-UP DC-TO-DC CONVERTER WITH TRUE SHUTDOWN TFT LCD BIAS SUPPLY SEPIC POWER SUPPLY LAYOUT PROCEDURE OUTLINE DIMENSIONS ORDERING GUIDE