A B DYNAMIC LOAD CIRCUIT IOSTEP CLK 3 TP15 C3 4.7uF R3 10K 1 2 Q1 SUD50N03-10CP-E3 J1 IOSTEP 1 2 3 4 5 R4 0.01 A A J2 VOUT 2 3 4 5 1 TP2 D8 D9 D10 D11 E8 E9 E10 E11 F6 F7 F8 F9 F10 F11 VIN C1 100uF 6.3V GND GND PGOOD COMP Cin1 10uF 6.3V Cin2 10uF 6.3V R1 100K 5% TP3 F1 TP5 TP10 VOUT VOUT VOUT VOUT VOUT VOUT U1 SW LTM4604EV SW C2 (OPT) G1 TRACK B3 TP7 GND VO- G2 1.2V E1 JP2 1.5V JP3 1.8V JP4 2.5V JP5 3.3V * ** CP (OPT) R5 10K 1% R7 4.02K 1% R8 2.37K 1% R9 1.58K 1% G5 G4 G3 F5 F4 F3 E5 E4 C11 C10 C9 C8 B11 B10 B9 B8 B7 B6 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 R6 5.76K 1% R10 R2 510K 5% TRACK 2 1 RUN/SS 2 (OPT) * ** TP14 TRACK FOR VIN > 3.0 V FOR VIN > 3.8 V B 3 JP6 VIN JP7 ON OFF 3 ON OFF +VOUT 4A MAX VO SELECT TP8 B CO5 100uF 6.3V TP12 B4 R11 OPT RUN/SS CO4 (OPT) TP11 JP1 COMP CO3 22uF 6.3V CO2 (OPT) CFF (OPT) R12 (OPT) GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND D1 CO1 (OPT) G6 G7 G8 G9 G10 G11 PGOOD F/B TP6 VIN GND VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN TP4 CSS (OPT) RUN/SS B1 C1 C3 C4 C5 C6 C7 D7 E6 E7 VO+ TP9 1 VIN 2.25V-5.5V TP1 VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VIN CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. A CONTRACT NO. APPROVALS DRAWN DATE HELEN 9/28/06 Manjing Xie 9/28/06 CHECKED TECHNOLOGY LTM4604EV High Density 4A Step-Down Power Module TITLE APPROVED ENGINEER DESIGNER SIZE CAGE CODE SCALE: Friday, May 04, 2007 B 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 FILENAME: DWG NO REV A DC1148A SHEET 1 OF 1