* L1 1 JP6 Boost Ext 2 3 10uH Rsw 1M 4 ** Vin Cin 4.7uF 6.3V On Off E3 3 GND * + Cin1 68uF 10V 1 E1 1 Vin 2 Vin JP5 Vout Enable 2 6 * Rsd 10M U1 LTC3026EDD SW VOUT 9 VOUT 10 FB SHDN BST GND 5 3 *** JP1 0.8V Rpg 100k 11 JP3 1.5V JP4 1.8V R2 R3 R4 R5 4.02k 4.02k 3.01k 3.01k 8 PG 7 GND JP2 1.2V R6 0 Cout 10uF 4V E2 Cout1 opt. GND E4 R1 4.02k E7 ** Vboost * ** *** GND Pgood Cboost 4.7uF 6.3V E5 Vout 1.5A(max) E6 Cin1 is an optional capacitor. It is inserted on the DC833 to dampen the (possible) ringing voltage due to the use of long input leads. On a normal, typical PCB, with the short traces, Cin1 is not needed. Also, Rsw and Rsd are optional parts on the DC833. They're inserted in case the jumper shunts accidently fall out. 1.14V is the minimum input voltage that the LTC3026 will operate at. The minimum input voltage for a specific regulator circuit depends on the output voltage (plus the dropout voltage). 3.5V is the maximum input voltage with the internal boost converter enabled. With an external voltage supply on the boost pin, the maximum input voltage is 5.5V. See the table below. JP6 Vin Vboost Ext 1.14V-5.5V 4.5V-5.5V Boost 1.14V-3.5V The maximum output voltage is 2.6V. 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. CONTRACT NO. APPROVALS DRAWN June Wu DATE 9/29/04 CHECKED TECHNOLOGY TITLE LTC3026EDD, Low Input Voltage VLDO Linear Regulator APPROVED ENGINEER 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 Tom Gross 9/24/04 DESIGNER Tuesday, February 08, 2005 SIZE CAGE CODE SCALE: FILENAME: DWG NO REV A DC833A SHEET 1 OF 1