LTC3703-5

Features:

·High Voltage Operation: Up to 60V
·Large 1W Gate Drivers (with 5V Supply)
·No Current Sense Resistor Required
·Step-Up or Step-Down DC/DC Converter
·Dual N-Channel MOSFET Synchronous Drive
·Excellent Transient Response and DC Line Regulation
·Programmable Constant Frequency: 100kHz to 600kHz
·±1% Reference Accuracy
·Synchronizable up to 600kHz
·Selectable Pulse Skip Mode Operation
·Low Shutdown Current: 25mA Typ
·Programmable Current Limit
·Undervoltage Lockout
·Programmable Soft-Start
·16-Pin Narrow SSOP and 28-Pin SSOP Packages


Application

·48V Telecom and Base Station Power Supplies
·Networking Equipment, Servers
·Automotive and Industrial Control


Pinout




Specifications

Supply Voltages
     VCC, DRVCC .......................................... 0.3V to 15V
     (DRVCC BGRTN), (BOOST SW) ....... 0.3V to 15V
     BOOST (Continuous) ..............................0.3V to 85V
     BOOST (400ms) .................................... 0.3V to 95V
     BGRTN ........................................................ 5V to 0V
VIN Voltage (Continuous) .......................... 0.3V to 70V
VIN Voltage (400ms) .................................. 0.3V to 80V
SW Voltage (Continuous) ............................. 1V to 70V
SW Voltage (400ms) ..................................... 1V to 80V
Run/SS Voltage ............................................ 0.3V to 5V
MODE/SYNC, INV Voltages...........................0.3V to 15V
fSET, FB, IMAX, COMP Voltages .................... 0.3V to 3V
Driver Outputs
     TG .................................. SW 0.3V to BOOST + 0.3V
     BG ............................. BGRTN 0.3V to DRVCC + 0.3V
Peak Output Current <10ms BG,TG ............................ 5A
Operating Temperature Range (Note 2) ... 40 to 85
Junction Temperature (Notes 3, 7) ......................... 125
Storage Temperature Range ....................65 to 150
Lead Temperature (Soldering, 10 sec.)................... 300


Description

The LTC®3703-5 is a synchronous step-down switching regulator controller that can directly step-down voltages from up to 60V, making it ideal for telecom and automotive applications. The LTC3703-5 drives external logic level N-channel MOSFETs using a constant frequency (up to 600kHz), voltage mode architecture.

A precise internal reference provides 1% DC accuracy. A high bandwidth error amplifier and patented* line feed forward compensation provide very fast line and load transient response. Strong 1W gate drivers allow the LTC3703-5 to drive multiple MOSFETs for higher current applications. The operating frequency is user programmable from 100kHz to 600kHz and can also be synchronized to an external clock for noise-sensitive applications.Current limit is programmable with an external resistor and utilizes the voltage drop across the synchronous MOSFET to eliminate the need for a current sense resistor.For applications requiring up to 100V operation, refer to the LTC3703 data sheet.