LTC1516 Datasheet | Linear Technology

LTC1516 Micropower, Regulated 5V Charge Pump DC/DC Converter Features s s s s s s s DESCRIPTION The LTC®1516 is a micropower charge pump DC/DC converter that produces a regulated 5V output from a 2V to 5V supply. Extremely low supply current (12µA typical with no load, < 1µA in shutdown) and low external parts count (two 0.22µF flying capacitors and two 10µF capacitors at VIN and VOUT) make the LTC1516 ideally suited for small, light load battery-powered applications. Typical efficiency (VIN = 3V) exceeds 70% with load currents between 50µA and 50m A. Modulating the SHDN pin keeps the typical efficiency above 70% with load currents all the way down to 10µA. The LTC1516 operates as either a doubler or a tripler depending on VIN and output load conditions to improve overall efficiency. The part has thermal shutdown and can survive a continuous short from VOUT to GND. In shutdown the load is disconnected from VIN. The LTC1516 is available in an 8-pin SO package in both mercial and industrial temperature grades. , LTC and LT are registered trademarks of Linear Technology Corporation. s s s s Ultralow Power: Typical Operating ICC = 12µA Short Circuit/Thermal Protection Regulated 5V ± 4% Output 2V to 5V Input Range No Inductors ICC in Shutdown: < 1µA Output Current: 20m A (VIN > 2V) 50m A (VIN > 3V) Shutdown Disconnects Load from VIN Internal Oscillator: 600k Hz pact Application Circuit (0.1 in2) 8-Pin SO Package U APPLICATIONS s s s s s 2-Cell to 5V Conversion Li-Ion Battery Backup Supplies Local 3V to 5V Conversion 5V Flash Memory Programmer Smart Card Readers TYPICAL APPLICATION 0.22µF Efficiency vs Output Current 90 VIN = 3V 1 2 C1+ VIN VOUT C2+ 0.22µF 8 C1- + EFFICIENCY (%) VIN = 2V TO 5V SHDN LTC1516 GND C2 - 7 6 5 ON/OFF 10µF 3 10µF 4 + SHDN = 0V 60 VOUT = 5V ± 4% IOUT = 0m A TO 20m A, VIN ≥ 2V IOUT = 0m A TO 50m A, VIN ≥ 3V 50 0.01 - F01 Figure 1. Regulated 5V Output from a 2V to 5V Input LOW IQ MODE (SEE FIGURE...