Description

The LTC1474CS8 is a high efficiency step-down converter with an internal P-channel MOSFET power switch. It is part of the LTC®1474/LTC1475 series and draws only 10µA typical DC supply current at no load while maintaining output voltage. The LTC1474CS8 uses logic-controlled shutdown while the LTC1475 features pushbutton on/off.

Specifications and features

The LTC1474CS8 has the following specifications and features:

• High Efficiency: Over 92% Possible
• Very Low Standby Current: 10µA Typ
• Available in Space Saving 8-Lead MSOP Package
• Internal 1.4Ω Power Switch (VIN = 10V)
• Wide VIN Range: 3V to 18V Operation
• Very Low Dropout Operation: 100% Duty Cycle
• Low-Battery Detector Functional During Shutdown
• Programmable Current Limit with Optional Current Sense Resistor (10mA to 400mA Typ)
• Short-Circuit Protection
• Few External Components Required
• Active Low Micropower Shutdown: IQ = 6µA Typ
• Pushbutton On/Off (LTC1475 Only)
• 3.3V, 5V and Adjustable Output Versions

Application Scenarios

The LTC1474CS8 is suitable for a wide range of applications, including:

• Cellular Telephones and Wireless Modems
• 4mA to 20mA Current Loop Step-Down Converter
• Portable Instruments
• Battery-Operated Digital Devices
• Battery Chargers
• Inverting Converters
• Intrinsic Safety Applications

Comparison

No load supply current of only 10µA

Wide input voltage range of 3V to 18V

High efficiency of over 92%

Space-saving 8-Lead MSOP package

Low-battery detector functional during shutdown

Programmable current limit

Short-circuit protection

Low dropout operation

Active low micropower shutdown

Pushbutton on/off (LTC1475 only)

Available in 3.3V, 5V and adjustable output versions

No significant disadvantages found