LT3505 - 1.2A, Step-Down Switching Regulator in 3mm x 3mm DFN

The LT3505 is a current mode PWM step-down DC/DC converter with an internal 1.4A power switch. The wide operating input range of 3.6V to 36V (40V maximum) makes the LT3505 ideal for regulating power from a wide variety of sources, including unregulated wall transformers, 24V industrial supplies and automotive batteries. The oscillator can be programmed for high frequency operation allowing the use of tiny, low cost external components or it can be programmed for lower frequency operation to maximize efficiency.

Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. The low current (<2µA) shutdown mode provides output disconnect, enabling easy power management in battery-powered systems.

Features

Wide Input Range: 3.6V to 36V Operating, 40V Maximum
Up to 1.2A Output Current
Resistor-Programmable Fixed-Frequency Operation from 200kHz to 3MHz
Output Adjustable Down to 780mV
Short-Circuit Robust
Uses Tiny Capacitors and Inductors
Soft-Start
Low Shutdown Current: <2µA
Low VCESAT Switch: 350mV at 1A
Thermally Enhanced, Low Profile 3mm x 3mm DFN-8 and MSOP-8 Packages

Typical Application

Applications

Automotive Battery Regulation
Industrial Control Supplies
Wall Transformer Regulation
Distributed Supply Regulation
Battery-Powered Equipment

Packaging

Order Information

Part Number	Package	Temp	Price(1-99)	Price (1k)*
LT3505EDD#PBF	3x3 DFN-8	E	$3.43	$2.40
LT3505EDD#TRPBF	3x3 DFN-8	E		$2.46
LT3505EMS8E#PBF	MS-8	E	$3.71	$2.60
LT3505EMS8E#TRPBF	MS-8	E		$2.66
LT3505IDD#PBF	3x3 DFN-8	I	$4.11	$2.88
LT3505IDD#TRPBF	3x3 DFN-8	I		$2.94
LT3505IMS8E#PBF	MS-8	I	$4.40	$3.08
LT3505IMS8E#TRPBF	MS-8	I		$3.14

Demo Boards

Part Number	Description	Price
DC1023A	LT3505EDD Demo Board \| 6V ≤ VIN ≤ 36V, VOUT = 5V @ 1A	$100.00
DC1395A	LT3505 HV Buck regulator board with plug in interface	Contact Factory