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LTC1514-3.3

Linear Technology
Part Number LTC1514-3.3
Manufacturer Linear Technology
Description Step-Up/Step-Down Switched Capacitor DC/DC Converters
Published Mar 27, 2005
Detailed Description LTC1514-3.3/LTC1514-5 Step-Up/Step-Down Switched Capacitor DC/DC Converters with Low-Battery Comparator FEATURES s s s ...
Datasheet PDF File LTC1514-3.3 PDF File

LTC1514-3.3
LTC1514-3.3

Overview
LTC1514-3.
3/LTC1514-5 Step-Up/Step-Down Switched Capacitor DC/DC Converters with Low-Battery Comparator FEATURES s s s s s s s s s s s s DESCRIPTION The LTC®1514-3.
3/LTC1514-5 are micropower switched capacitor DC/DC converters that produce a regulated output voltage by either stepping up or stepping down the input voltage.
Output voltage is fixed at either 3.
3V (LTC1514-3.
3) or 5V (LTC1514-5) by an internal resistor divider.
A unique architecture allows the parts to accommodate a wide input voltage range (2V to 10V) while maintaining ± 4% regulation.
Additional circuitry prevents excessive inrush current and output voltage ripple when large VIN to VOUT differentials are present.
An internal uncommitted comparator is kept active in shutdown.
The comparator has an open-drain output for flexible interfacing.
The parts are short-circuit and overtemperature protected.
Battery life is maximized by very low operating currents (ICC = 60µA typ, 10µA in shutdown).
Both parts are available in an SO-8 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
3.
3V or 5V Output Voltages 2V to 10V Input Voltage Range Up to 50mA Output Current Only Three External Capacitors Required Soft Start Limits Inrush Current at Turn-On Low Operating Current: 60µA Low Shutdown Current: 10µA Shutdown Disconnects Load from VIN Short-Circuit and Overtemperature Protected 650kHz Switching Frequency Low-Battery Comparator Active in Shutdown Available in SO-8 Package U APPLICATIONS s s s s s Battery-Operated Equipment Smart Card Readers Local Power Supplies Handheld Instruments Battery Backup Supplies TYPICAL APPLICATION 5V Step-Up/Step-Down Power Supply with Low-Battery Detect 5.
2 100k 1.
33M 1% ON OFF LOW BAT 1 2 3 499k 1% 4 LTC1514-5 SHDN LBO LBI GND VOUT VIN C1+ C1 – 7 6 5 0.
22µF + OUTPUT VOLTAGE (V) 8 VOUT = 5V IOUT = 50mA 10µF VIN 4-CELL NiCd 5.
1 5.
0 + 10µF 1514 TA01 4.
9 4.
8 U 2 U LTC1514-5 Output Voltage vs Input Voltage IOUT = 10mA 3 4 5 8 6 7 I...


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