Datasheet > LTC2927

LTC2927

更新时间： 2023-12-20 18:46:31

品牌	Logo	应用领域
亚德诺 - ADI		控制器
页数	文件大小	规格书
16页	257K
描述
单路电源跟踪控制器

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LTC2927 数据手册

LTC2927

Single Power Supply

Tracking Controller

DESCRIPTIO

FEATURES

The LTC^®2927 provides a simple solution to power supply

tracking and sequencing requirements. By selecting a few

resistors, the supply can be conﬁgured to ramp-up and

ramp-down with differing ramp rates, voltage offsets, or

time delays relative to other supplies or a master signal.

Flexible Power Supply Tracking

Tracks Both Up and Down

Power Supply Sequencing

Supply Stability is Not Affected

Low Pin Count

Controls Single Supply without Series FETs

By forcing current into a feedback node of an independent

supply, the LTC2927 causes the output to track a ramp

signalwithoutinsertinganypasselementlosses. Because

the current is controlled in an open-loop manner, the

LTC2927 does not affect the transient response or stabil-

ity of the supply. The compact solution at point of load

minimizes the trace length of the DC/DC circuit sensitive

FB node. Furthermore, it presents a high impedance when

power-up is complete, effectively removing it from the

DC/DC circuit.

Adjustable Ramp Rate

Supply Shutdown Output

Available in 8-Lead ThinSOT™ and 8-Lead

(3mm × 2mm) DFN Packages

APPLICATIO S

and V Supply Tracking

CORE

I/O

Microprocessor, DSP and FPGA Supplies

Multiple Supply Systems

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

ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners. Patents Pending.

Point-of-Load Supplies

TYPICAL APPLICATIO

EARLY V

Track-Up and Track-Down Waveforms

3.3V

138k

0.1μF

RAMP

(3.3V)

100k

LTC2927

2.5V

1.8V

SDO

RUN/SS IN

DC/DC

FB = 1.235V

1V/DIV

RAMPBUF

TRACK

OUT

1.8V

16.5k

13k

16.5k

GND

35.7k

2927 TA01b

10ms/DIV

EARLY V

3.3V

0.1μF

RAMP

(3.3V)

RAMP

SDO

LTC2927

2.5V

1.8V

1V/DIV

RUN/SS IN

DC/DC

FB = 0.8V

RAMPBUF

OUT

2.5V

887k

412k

TRACK

887k

GND

412k

2927 TA01c

10ms/DIV

2927 TA01a

2927fb

12 3 4 5 6 7...16

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