LT1316 Datasheet | Linear Technology

LT1316 Micropower DC/DC Converter with Programmable Peak Current Limit Features s s DESCRIPTION The LT®1316 is a micropower step-up DC/DC converter that operates from an input voltage as low as 1.5V. A programmable input current limiting function allows precise control of peak switch current. Peak switch current can be set to any value between 30m A and 500m A by adjusting one resistor. This is particularly useful for DC/DC converters operating from high source impedance inputs such as lithium coin cells or telephone lines. The fixed off-time, variable on-time regulation scheme results in quiescent current of only 33µA in active mode. Quiescent current decreases to 3µA in shutdown with the low-battery detector still active. The LT1316 is available in 8-lead MSOP and SO packages. , LTC and LT are registered trademarks of Linear Technology Corporation. s s s s s Precise Control of Peak Switch Current Quiescent Current: 33µA in Active Mode 3µA in Shutdown Mode Low-Battery Detector Active in Shutdown Low Switch VCESAT: 300m V at 500m A 8-Lead MSOP and SO Packages Operates with VIN as Low as 1.5V Logic Level Shutdown Pin U APPLICATIONS s s s Battery Backup LCD Bias Low Power - 48V to 5V/3.3V Converters TYPICAL APPLICATION 2-Cell to 5V Step-Up Converter L1 47µH 6 7 VIN SHDN LT1316 NC 2 LBI RSET 3 R5 10k 1% D1: MOTOROLA MBR0520L L1: SUMIDA CD43-470 LBO GND 4 1 NC R2 324k 1% 5 SW FB 8 D1 R1 1M 1% 5V 50m A 90 3.3VIN 2.5VIN 2 CELLS C1 47µF C2 47µF EFFICIENCY (%) + + 1316 TA01 Efficiency vs Load Current 1.8VIN 1316 TA02 LOAD CURRENT (m...