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LTC1516

Linear Technology
Part Number LTC1516
Manufacturer Linear Technology
Description Micropower/ Regulated 5V Charge Pump DC/DC Converter
Published Mar 27, 2005
Detailed Description LTC1516 Micropower, Regulated 5V Charge Pump DC/DC Converter FEATURES s s s s s s s DESCRIPTION The LTC®1516 is a micro...
Datasheet PDF File LTC1516 PDF File

LTC1516
LTC1516

Overview
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 50mA.
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 commercial 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: 20mA (VIN > 2V) 50mA (VIN > 3V) Shutdown Disconnects Load from VIN Internal Oscillator: 600kHz Compact 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– 80 + EFFICIENCY (%) VIN = 2V TO 5V SHDN LTC1516 GND C2 – 7 6 5 ON/OFF 10µF 3 10µF 4 70 + SHDN = 0V 60 VOUT = 5V ± 4% IOUT = 0mA TO 20mA, VIN ≥ 2V IOUT = 0mA TO 50mA, VIN ≥ 3V 50 0.
01 1516 • F01 Figure 1.
Regulated 5V Output from a 2V to 5V Input U U LOW IQ MODE (SEE FIGURE 3) 0.
1 1 1...


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