5 4 3 2 1 D D GND VIN 3 CIN2 1uF 10V 0603 JP1 2 GND JP2 2 R3 10M 1 GND CIN1 10uF,6.3V 0805 E3 MD0 GND R4 10M U1 C MD0 MD0 1 VIN 2 C1+ 3 C1- 4 C1 1uF 10V 0603 5 MD0 VIN C1+ C1GND VIN 1 E2 VIN 3 VIN 3.2V-5.5V E1 R1 536K 1% FB FB 10 MD1 MD1 9 C2+ C2+ 8 VOUT VOUT 7 C2C2- 6 R2 475K 1% C C3 4.7pF MD1 VOUT C2 1uF 10V 0603 LTC3251EMSE COUT1 10uF 6.3V 1206 COUT2 1uF 6.3V 0603 GND E5 MD1 E6 VOUT=1.5V IOUT=500mA * E7 GND B B DERATES LINEARLY TO 200mA * IOUT FOR VIN LESS THAN 3.5V NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE INOHMS, 0402. ALL CAPACITORS ARE IN MICROFARADS, 0402. 2. INSTALL SHUNTS ON JP1 AND JP2 PIN 2AND 3. 3. THE MODES OF OPERATION: A CONTRACT NO. APPROVALS JP1 JP2 MODE GND VIN GND VIN GND GND VIN VIN SHUTDOWN BURST CONTINUOUS SUPER BURST DRAWN: TECHNOLOGY KIM T. CHECKED: TITLE: SCHEMATIC SIZE DWG NO. APPROVED: ENGINEER: RAYMOND Z. DESIGNER: 4 3 A 500mA SPREAD-SPECTRUM, LOW NOISE, INDUCTORLESS STEP DOWN DC/DC CONVERTER A DATE: 5 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only Friday, August 23, 2002 2 REV DC506A - LTC3251EMSE SHEET 1 1 A OF 1