Features

• V_OUT as Low as 0.6V
• High Power Switching Regulator Controller for 3.3V-5V to 0.6V-3.xV Step-Down Applications
• No Current Sense Resistor Required
• Low Input Supply Voltage Range: 3V to 8V
• Maximum Duty Cycle >91% Over Temperature
• All N-Channel External MOSFETs
• Excellent Output Regulation: ±1% Over Line, Load and Temperature Variations
• High Efficiency: Over 95% Possible
• Adjustable or Fixed 2.5V Output (LTC3832)
• Programmable Fixed Frequency Operation: 100kHz to 500kHz
• External Clock Synchronization
• Soft-Start
• Low Shutdown Current: <10µA
• Overtemperature Protection
• Available in SO-8 and SSOP-16 Packages

Typical Application

Description

The LTC3832/LTC3832-1 are high power, high efficiency switching regulator controllers optimized for 3.3V-5V to 0.6V-3.xV step-down applications. A precision internal reference and feedback system provide ±1% output regulation over temperature, load current and line voltage variations. The LTC3832/LTC3832-1 use a synchronous switching architecture with N-channel MOSFETs. Additionally, the chip senses output current through the drain-source resistance of the upper N-channel MOSFET, providing an adjustable current limit without a current sense resistor.

The LTC3832/LTC3832-1 operate with an input supply voltage as low as 3V and with a maximum duty cycle of >91% over temperature. They include a fixed frequency PWM oscillator for low output ripple operation. The 300kHz free-running clock frequency can be externally adjusted or synchronized with an external signal from 100kHz to 500kHz. In shutdown mode, the LTC3832 supply current drops to <10µA. The LTC3832-1 is the SO-8 version without current limit, frequency adjustment and shutdown functions.