5 4 3 2 1 REVISION HISTORY ECO REV _ 1 DESCRIPTION PRODUCTION APPROVED DATE EDWIN L. 04-20-11 D D C JP1 3 USER SELECT 2 1 ON 4 OFF 3 R9 100k IN OUT SHDN 4 E4 IN SHDN -1.22V -2.5V -5.0V -12.0V -15.0V USER SELECT RSD 0 7 6 ADJ COUT 10uF 25V 1206 C2 OPT 7343 E3 VOUT -1.5A MAX GND 2 4 6 8 10 12 SUNCON 50CE10BSS R8 OPT E1 VOUT JP2 HD2X6-079 C 1 3 5 7 9 11 CIN 10uF 50V 1210 8 OUT GND 10uF 50V GND *C1 2 IN 5 1 + E2 VIN VIN -1.9V TO -30V E5 GND + 9 U1 LT3015EDD R2 0 R3 3.65k R4 11.0k R5 30.9k R6 39.2k R7 OPT R1 3.48k B B * CAPACITOR C1 IS AN OPTIONAL PART. IT WAS INSERTED ON THE DC1728A TO DAMPEN THE (POSSIBLE) RINGING VOLTAGE DUE TO THE USE OF LONG INPUT LEADS. ON A NORMAL, TYPICAL PCB, WITH SHORT TRACES, THE CAPACITOR IS NOT NEEDED. SEE APPLICATION NOTE AN88 FOR MORE DETAILS. CUSTOMER NOTICE NOTES: UNLESS OTHERWISE SPECIFIED A 1. ALL RESISTORS ARE IN OHMS, 0402. ALL CAPACITORS ARE IN MICROFARADS. 2. INSTALL SHUNTS AS SHOWN. APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. 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. 5 4 3 TECHNOLOGY KT EDWIN L. TITLE: SCHEMATIC A 1.5A, LOW NOISE, NEGATIVE REGULATOR WITH PRECISION CURRENT LIMIT SIZE IC NO. DATE: REV. LT3015EDD N/A SCALE = NONE 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only 1 DEMO CIRCUIT 1728A Wednesday, April 20, 2011 SHEET 1 2 1 OF 1