LTC1514 Series

Step-Up/Step-Down Switched Capacitor DC/DC Converters with Low-Battery Comparator

Catalog

Step-Up/Step-Down Switched Capacitor DC/DC Converters with Low-Battery Comparator

Part	Output Configuration	Voltage - Input (Max) [Max]	Frequency - Switching	Mounting Type	Number of Outputs	Package / Case	Package / Case [y]	Package / Case [x]	Voltage - Input (Min) [Min]	Supplier Device Package	Current - Output	Operating Temperature [Max]	Operating Temperature [Min]	Voltage - Output (Min/Fixed)	Output Type	Function
Analog Devices LTC1514CS8-5#PBF	Positive	10 V	650 kHz	Surface Mount	1	8-SOIC	3.9 mm	0.154 in	2.7 V	8-SO	50 mA	70 °C	0 °C	5 V	1.81 mOhm	Step-Up/Step-Down
Analog Devices LTC1514IS8-5#PBF	Positive	10 V	650 kHz	Surface Mount	1	8-SOIC	3.9 mm	0.154 in	2.7 V	8-SO	50 mA	85 °C	-40 °C	5 V	1.81 mOhm	Step-Up/Step-Down
Analog Devices LTC1514CS8-3.3#PBF	Positive	8 V	650 kHz	Surface Mount	1	8-SOIC	3.9 mm	0.154 in	2 V	8-SO	50 mA	70 °C	0 °C	3.3 V	1.81 mOhm	Step-Up/Step-Down

Catalog

Step-Up/Step-Down Switched Capacitor DC/DC Converters with Low-Battery Comparator

Key Features

• 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

Description

The LTC1514-3.3/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 VINto VOUTdifferentials 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.ApplicationsBattery Operated EquipmentSmart Card ReadersLocal Power SuppliesHandheld InstrumentsBattery Backup Supplies