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特性

• 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 V_IN
• Short-Circuit and Overtemperature Protected
• 650kHz Switching Frequency
• Low-Battery Comparator Active in Shutdown
• Available in SO-8 Package

产品详情和应用

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 V_IN to V_OUT 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 (I_CC= 60µA typ, 10µA in shutdown). Both parts are available in an SO-8 package.

Applications

• Battery Operated Equipment
• Smart Card Readers
• Local Power Supplies
• Handheld Instruments
• Battery Backup Supplies