LTC2923 Linear Technology, LTC2923 Datasheet

LTC2923

Manufacturer Part Number

LTC2923

Description

Power Supply Tracking Controller

Manufacturer

Linear Technology

Datasheet

1.LTC2923.pdf (20 pages)

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FEATURES

TYPICAL APPLICATIO

■

APPLICATIO S

All other trademarks are the property of their respective owners.

Patents Pending.

■

16.5k

13k

, LTC and LT are registered trademarks of Linear Technology Corporation.

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

Microprocessor, DSP and FPGA Supplies

Servers

Communication Systems

3.3V

CORE

138k

100k

887k

412k

and V

I/O

RAMPBUF

TRACK1

TRACK2

Supply Tracking

LTC2923

GATE

GND

10nF

STATUS

RAMP

SDO

FB2

FB1

3.3V

35.7k

412k

2923 TA01

FB = 1.235V

FB = 0.8V

DC/DC

887k

16.5k

OUT

1.8V

2.5V

DESCRIPTIO

The LTC

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 open-

loop 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-termi-

nal linear regulator). When the FET is used, an electronic

circuit breaker provides protection from short-circuit

conditions.

1V/DIV

2923 provides a simple solution to power supply

3.3V

2.5V

1.8V

Tracking Controller

1ms/DIV

Power Supply

www.DataSheet4U.com

2923 TA02

LTC2923

2923 F08b

3.3V

2.5V

1.8V

1V/DIV

2923fa

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