5 4 3 2 1 REVISION HISTORY D+ RB1 1k 1206 RTB 40.2k 1206 RA2 4.53k 1206 RA1 4.53k 1206 RTA 110k 1206 E8 VCC Q1 MMBT3906 3 2 DIODE SELECT 1 Q1 2 3 EXT JP1 1 2 3 4 20 1 2 5 3 1 19 INT INT&EXT EXT 6 4 2 DS 5 3 1 2 11 OV VL1 UV DS VCC B VH1 TO2 TO1 VPTAT PS 18 JP3 HD2X3-079 D- 10 21 GND 17 GND GND 6 4 2 VT2 VL2 VCC VCC OPEN GND D+ VH2 3 PS VT1 TMR OFF R3 330 LED1 LN1251C RED UV R4 330 TO2 LED2 LN1251C RED R5 330 TO1 LED3 LN1251C RED VCC LED4 LN1251C RED LED5 LN1351C GRN VCC C (QFN20UD-3X3) VREF 9 5 R2 330 OV VCC C OT @ 100C E11 UT @ 0C 6 R6 10k 7 R7 10k R8 10k R9 10k 14 E12 15 E13 13 E14 12 E15 8 E16 16 GND VCC R1 330 U1 LTC2995IUD E10 LED ON/OFF ON VCC 2.25V - 5.5V JP2 C1 470pF VCC C2 0.1uF 0402 D 1 RB2 1k 1206 E7 2 RTC 30.9k 1206 10-11-11 E9 1 RC1 44.2k 1206 DATE LEO C. D- 2 E6 RC2 115k 1206 APPROVED VCC VREF E5 DESCRIPTION PRODUCTION 1 E4 2 2 E3 REV __ 1 E2 GND 1 E1 5V +/-10% MONITOR GND VIN1 2 12V +/-10% MONITOR GND VIN2 1 D ECO R10 OPT VCC GND OV UV TO2 TO1 VPTAT E17 GND 0402 C3 22nF 0402 B 200ms DELAY JP4 HD2X3-079 PS VCC OPEN GND VT1 UT OT UT VT2 OT OT UT CUSTOMER NOTICE A 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. NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. 2. INSTALL SHUNTS AS SHOWN. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 APPROVALS 4 3 TECHNOLOGY KIM T. LEO C. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC VOLTAGE AND TEMPERATURE MONITOR SIZE N/A SCALE = NONE 2 DATE: IC NO. LTC2995IUD REV. 2 DEMO CIRCUIT 1871A 10/11/2011, 11:02 AM SHEET 1 1 OF 1 A