LTC3830 - High Power Step-Down Synchronous DC/DC Controllers for Low Voltage Operation

The LTC3830/LTC3830-1 are high power, high efficiency switching regulator controllers optimized for 3.3V-5V to 1.xV-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 LTC3830/LTC3830-1 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 FET, providing an adjustable current limit without a current sense resistor.

The LTC3830/LTC3830-1 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 200kHz free-running clock frequency can be externally adjusted or synchronized with an external signal from 100kHz to 500kHz. In shutdown mode, the LTC3830 supply current drops to <10µA. The LTC3830-1 differs from the LTC3830 S8 version by replacing shutdown with a soft-start function.

For a similar, pin compatible DC/DC converter with an output voltage as low as 0.6V, please refer to the LTC3832.

Features

High Power Switching Regulator Controller for 3.3V-5V to 1.xV-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 3.3V Output (16-Pin Version)
Programmable Fixed Frequency Operation: 100kHz to 500kHz
External Clock Synchronization
Soft-Start (16-Pin Version and LTC3830-1)
Low Shutdown Current: <10µA
Overtemperature Protection
Available in S8, S16 and SSOP-16 Packages

Typical Application

Applications

CPU Power Supplies
Multiple Logic Supply Generator
Distributed Power Applications
High Efficiency Power Conversion

Packaging

Order Information

Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC3830-1ES8#PBF	SO-8	E	$3.61	$3.05
LTC3830-1ES8#TRPBF	SO-8	E		$3.11
LTC3830EGN#PBF	SSOP-16	E	$4.50	$3.80
LTC3830EGN#TRPBF	SSOP-16	E		$3.86
LTC3830ES#PBF	SO-16	E	$4.14	$3.50
LTC3830ES#TRPBF	SO-16	E		$3.56
LTC3830ES8#PBF	SO-8	E	$3.61	$3.05
LTC3830ES8#TRPBF	SO-8	E		$3.11

Demo Boards

Part Number	Description	Price
DC469A	LTC3830EGN \| High Efficiency Step-Down Power Supply, 3V to 8V Input, 2.5/1.8/1.5Vout @ 15A	$125.00
DC493A	LTC3830-1ES8 \| Low Voltage, 8A DC/DC Converter, Vin = 3V - 8V, Vout = 1.8V @ 8A Max.	$125.00