LTC2923 Power Supply Tracking Controller

The LTC®2923 provides a simple solution to power supply tracking and sequencing requirements. By selecting a few resistors, the supplies can be configured to ramp-up and ramp-down together or with voltage offsets, time delays or different ramp rates.

By introducing currents into the feedback nodes of two independent switching regulators, the LTC2923 causes their outputs to track without inserting any pass element losses. Because the currents are controlled in an openloop manner, the LTC2923 does not affect the transient response or stability of the supplies. Furthermore, it presents a high impedance when power-up is complete, effectively removing it from the DC/DC circuit.

For systems that require a third supply, one supply can be controlled with a series FET. This optional series FET can also control a supply that does not allow direct access to its feedback resistors (e.g., a power module) or a supply whose output cannot be forced to ground (e.g., a 3-terminal linear regulator). When the FET is used, an electronic circuit breaker provides protection from short-circuit conditions

产品特点 Features

Flexible Power Supply Tracking
Tracks Both Up and Down
Power Supply Sequencing
Supply Stability is Not Affected
Controls Two Supplies Without Series FETs
Controls a Third Supply With a Series FET
Adjustable Ramp Rates
Electronic Circuit Breaker
Available in 10-Lead MS and 12-Lead (4mm × 3mm) DFN Packages

参数

应用

VCORE and VI/O Supply Tracking
Microprocessor, DSP and FPGA Supplies
Servers
Communication Systems

典型应用图

LTC2923 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) *
LTC2923CDE	DFN	12	C	$3.60	$3.15
LTC2923CDE#PBF	DFN	12	C	$3.60	$3.15
LTC2923CDE#TR	DFN	12	C		$3.21
LTC2923CDE#TRPBF	DFN	12	C		$3.21
LTC2923CMS	MSOP	10	C	$3.90	$2.95
LTC2923CMS#PBF	MSOP	10	C	$3.90	$2.95
LTC2923CMS#TR	MSOP	10	C		$3.01
LTC2923CMS#TRPBF	MSOP	10	C		$3.01
LTC2923IDE	DFN	12	I	$4.15	$3.60
LTC2923IDE#PBF	DFN	12	I	$4.15	$3.60
LTC2923IDE#TR	DFN	12	I		$3.66
LTC2923IDE#TRPBF	DFN	12	I		$3.66
LTC2923IMS	MSOP	10	I	$4.50	$3.40
LTC2923IMS#PBF	MSOP	10	I	$4.50	$3.40
LTC2923IMS#TR	MSOP	10	I		$3.46
LTC2923IMS#TRPBF	MSOP	10	I		$3.46

LTC2923 数据手册及相关资料下载

数据手册(英文) : LTC2923 - Power Supply Tracking Controller.PDF
可靠性数据 : R413 Reliability Data .PDF
产品选型卡 : High Voltage Surge Stoppers.PDF
产品选型卡 : Voltage Monitors & Supervisors Quick Guide.PDF