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LTC1261L

Linear Technology
Part Number LTC1261L
Manufacturer Linear Technology
Description Switched Capacitor Regulated Voltage Inverter
Published Mar 22, 2005
Detailed Description LTC1261L Switched Capacitor Regulated Voltage Inverter FEATURES s s s s s s s s s DESCRIPTIO Regulated Negative Voltag...
Datasheet PDF File LTC1261L PDF File

LTC1261L
LTC1261L

Overview
LTC1261L Switched Capacitor Regulated Voltage Inverter FEATURES s s s s s s s s s DESCRIPTIO Regulated Negative Voltage from a Single Positive Supply REG Pin Indicates Output is in Regulation Adjustable or Fixed Output Voltages Output Regulation: ±3.
5% Supply Current: 650µA Typ Shutdown Mode Drops Supply Current to 5µA Up to 20mA Output Current Requires Only Three or Four External Capacitors Available in MS8 and SO-8 Packages U APPLICATIO S s s s s The LTC®1261L is a switched-capacitor voltage inverter designed to provide a regulated negative voltage from a single positive supply.
The LTC1261L operates from a single 2.
7V to 5.
25V supply and provides an adjustable output voltage from –1.
23V to – 5V.
The LTC1261L-4/ LTC1261L-4.
5 needs a single 4.
5V to 5.
25V supply and provides a fixed output voltage of – 4V to – 4.
5V respectively.
Three external capacitors are required: a 0.
1µF flying capacitor and an input and output bypass capacitors.
An optional compensation capacitor at ADJ (COMP) can be used to reduce the output voltage ripple.
Each version of the LTC1261L will supply up to 20mA output current with guaranteed output regulation of ±3.
5%.
The LTC1261L includes an open-drain REG output that pulls low when the output is within 5% of the set value.
Quiescent current is typically 650µA when operating and 5µA in shutdown.
The LTC1261L is available in 8-pin MSOP and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
GaAs FET Bias Generators Negative Supply Generators Battery-Powered Systems Single Supply Applications TYPICAL APPLICATION Waveforms for – 4V Generator with Power Valid – 4V Generator with Power Valid 0V 5V 5V C1 1µF C2 0.
1µF 1 2 VCC SHDN 8 10k POWER VALID VOUT = –4V AT 10mA OUT – 4V 5V SHDN 0V 5V POWER VALID 0V *OPTIONAL 1261L TA01 7 REG C1 + LTC1261L-4 3 6 OUT C1 – 4 GND COMP 5 C3* 100pF + C4 3.
3µF U 0.
1ms/DIV 1261L TAO2 U 1 LTC1261L ABSOLUTE (Note 1) AXI U RATI GS Output Short-Circuit Duration .
.
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