LTC1703 Dual 550kHz Synchronous 2-Phase Switching Regulator Controller with 5-Bit VID

The LTC®1703 is a dual switching regulator controller optimized for high efficiency with low input voltages. It includes two complete, on-chip, independent switching regulator controllers. Each is designed to drive a pair of external N-channel MOSFET devices in a voltage mode feedback, synchronous buck configuration. The LTC1703 includes digital output voltage adjustment on side 1 that conforms to the Intel Mobile VID specification. It uses a constant-frequency, true PWM design switching at 550kHz, minimizing external component size and cost and optimizing load transient performance. The synchronous buck architecture automatically shifts to discontinuous and then to BurstMode™ operation as the output load decreases, ensuring maximum efficiency over a wide range of load currents.

The LTC1703 features an onboard reference trimmed to 1% and delivers better than 1.5% regulation at the converter outputs. An optional latching FAULT mode protects the load if the output rises 15% above the intended voltage. Each channel can be enabled independently; with both channels disabled, the LTC1703 shuts down and supply current drops below 100µA

产品特点 Features

Side 1 Output Is Compliant with Intel Mobile VID Specifications (Includes 5-Bit DAC)
0.9V to 2.0V Output Voltage with 25mV/50mV Steps
Two Sides Run Out-of-Phase to Minimize CIN
Precision Internal 0.8V ±1% Reference
Two Independent PWM Controllers in One Package
All N-Channel External MOSFET Architecture
No External Current Sense Resistor
550kHz Switching Frequency Minimizes External Component Size
Very Fast Transient Response
Up to 25A Output Current per Channel
Low Shutdown Current: < 100µA
Small 28-Pin SSOP Package

应用

Mobile Pentium® III Processor Systems
Microprocessor Core and I/O Supplies
Multiple Logic Supply Generator
High Efficiency Power Conversion

典型应用图

参数

LTC1703 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) *
LTC1703CG	SSOP	28	C	$5.95	$5.20
LTC1703CG#PBF	SSOP	28	C	$5.95	$5.20
LTC1703CG#TR	SSOP	28	C		$5.30
LTC1703CG#TRPBF	SSOP	28	C		$5.30
LTC1703IG	SSOP	28	I	$8.93	$6.00
LTC1703IG#PBF	SSOP	28	I	$8.93	$6.00
LTC1703IG#TR	SSOP	28	I		$6.10
LTC1703IG#TRPBF	SSOP	28	I		$6.10

LTC1703 数据手册及相关资料下载

数据手册(英文) : LTC1703 - Dual 550kHz Synchronous 2-Phase Switching Regulator Controller with 5-Bit VID.PDF
设计要点 (英文) : DN280 - Tiny and Efficient Boost Converter Generates 5V at 3A from 3.3V Bus.PDF
可靠性数据 : R384 Reliability Data .PDF