LTC1649IS
发布时间：2018/6/19
概述
The LTC1649IS is a high power, high efficiency switching regulator controller optimized for use with very low supply voltages. It operates from 2.7V to 5V input, and provides a regulated output voltage from 1.26V to 2.5V at up to 20A load current. A typical 3.3V to 2.5V application features efficiency above 90% from 1A to 10A load. The LTC1649IS uses a pair of standard 5V logic-level N-channel external MOSFETs, eliminating the need for expensive P-channel or super-low-threshold devices.
The LTC1649IS shares its internal switching architecture with the LTC1430, and features the same ±1% line, load and temperature regulation characteristics. Current limit is user-adjustable without requiring an external low-value sense resistor. The LTC1649CS uses a 200kHz switching frequency and voltage mode control, minimizing external component count and size. Shutdown mode drops the quiescent current to below 10μA.
The LTC1649IS is available in the 16-pinnarrow SO package.
特点
High Power 3.3V to 1.XV-2.XV Switching Regulator
Controller: Up to 20A Output
All N-Channel External MOSFETs
Provides 5V MOSFET Gate Drive with 3.3V Input
Constant Frequency Operation Minimizes
Inductor Size
Excellent Output Regulation: ±1% Over Line, Load and Temperature Variations
High Efficiency: Over 90% Possible
No Low-Value Sense Resistor Needed
Available in 16-Lead SO Package
应用
3.3V Input Power Supply for Low Voltage
Microprocessors and Logic
Low Input Voltage Power Supplies
High Power, Low Voltage Regulators
Local Regulation for Multiple Voltage Distributed
Power Systems
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