LTC3802 Dual 550kHz Synchronous 2-Phase DC/DC Controller with Programmable Up/Down Tracking

The LTC®3802 is a dual switching regulator controller optimized for high efficiency step-down conversion from input voltages between 3V to 30V. The controller uses a leading edge modulation scheme to allow extremely low duty cycle operation. The constant frequency voltage mode controller allows a phase-lockable frequency between 330kHz and 750kHz. Power loss and noise due to the ESR of the input capacitors are minimized by operating the two controller output stages 180° out of phase. The synchronous buck architecture automatically shifts to Burst Mode operation as the output load decreases, ensuring maximum efficiency over a wide range of load currents.

The LTC3802 features an onboard, trimmed 0.6V reference and provides better than 1% regulation at the converter outputs. A separate output sense provides real time overvoltage protection and PGOOD sensing. An FBT pin programs the power-up/-down tracking between the two channels to meet various sequencing requirements. A RUN/SS pin provides soft-start and externally programmable current limit protection functions.

U.S. Patent Nos 5481178, 5846544, 6304066, 6580258, 5055767, 6307356

产品特点 Features

Wide VIN Range: 3V to 30V Operation with Line Feedforward Compensation
Leading Edge Modulation Architecture for Extremely Low Duty Cycle Operation
Phase-Lockable Fixed Frequency: 330kHz to 750kHz
Two 180° Out-of-Phase Controllers
Fast Programmable Power-Up/-Down Tracking
Programmable Current Limit Without External Current Sense Resistor
Optional Burst Mode® Operation at Light Load
±1% 0.6V Voltage Reference
External N-Channel MOSFET Architecture
Low Shutdown Current: <100µA
Overvoltage Protection and PGOOD Flag
Small 28-Lead SSOP and 32-Lead QFN Packages

应用

Notebook and Palmtop Computers
Portable Instruments
Battery-Operated Digital Devices
DC Power Distribution Systems

典型应用图

参数

LTC3802 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LTC3802EGN	SSOP	28	E	$5.71	$4.80
LTC3802EGN#PBF	SSOP	28	E	$5.71	$4.80
LTC3802EGN#TR	SSOP	28	E		$4.90
LTC3802EGN#TRPBF	SSOP	28	E		$4.90
LTC3802EUH	QFN	32	E	$5.71	$4.80
LTC3802EUH#PBF	QFN	32	E	$5.71	$4.80
LTC3802EUH#TR	QFN	32	E		$4.90
LTC3802EUH#TRPBF	QFN	32	E		$4.90

LTC3802 数据手册及相关资料下载

数据手册(英文) : LTC3802 - Dual 550kHz Synchronous 2-Phase DC/DC Controller with Programmable Up/Down Tracking.PDF
可靠性数据 : R384 Reliability Data .PDF