Datasheet > LTC3711

LTC3711

更新时间： 2023-12-20 18:46:38

品牌	Logo	应用领域
亚德诺 - ADI		控制器
页数	文件大小	规格书
24页	301K
描述
5 位可调、宽工作范围、No RSENSE?降压型控制器

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LTC3711 数据手册

LTC3711

5-Bit Adjustable,

Wide Operating Range,

No R_SENSE^TMStep-Down Controller

DESCRIPTIO

FEATURES

The LTC^®3711 is a synchronous step-down switching

regulator controller for CPU power. An output voltage

between 0.925V and 2.000V is selected by a 5-bit code

(Intel mobile VID specification). The controller uses a

valley current control architecture to deliver very low duty

cycles without requiring a sense resistor. Operating fre-

quency is selected by an external resistor and is compen-

■

5-Bit Programmable Output Voltage: 0.925V to 2V

■

No Sense Resistor Required

■

True Current Mode Control

■

2% to 90% Duty Cycle at 200kHz

■

t_ON(MIN)< 100ns

■

Supports Active Voltage Positioning

■

Extremely Fast Transient Response

■

Stable with Ceramic C_OUT

sated for variations in V_INand V_OUT.

■

Dual N-Channel MOSFET Synchronous Drive

Discontinuous mode operation provides high efficiency

operation at light loads. A forced continuous control pin

reduces noise and RF interference and can assist second-

ary winding regulation by disabling discontinuous mode

operation when the main output is lightly loaded.

■

Power Good Output Voltage Monitor

■

Wide V_INRange: 4V to 36V

■

±1% 0.8V Reference

■

Adjustable Current Limit

■

Adjustable Switching Frequency

Fault protection is provided by internal foldback current

limiting, an output overvoltage comparator and optional

short-circuitshutdowntimer.Soft-startcapabilityforsup-

ply sequencing is accomplished using an external timing

capacitor. The regulator current limit level is user pro-

grammable. Wide supply range allows operation from 4V

to 36V at the input.

■

Programmable Soft-Start

■

Output Overvoltage Protection

■

Optional Short-Circuit Shutdown Timer

■

Micropower Shutdown: I_Q< 30µA

■

^{Available in 24-L}U^{ead Narrow SSOP Package}

APPLICATIO S

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

No R_SENSEis a trademark of Linear Technology Corporation.

Pentium is a registered trademark of Intel Corporation.

Power Supplies for Mobile Pentium^®Processors

■

Notebook and Palmtop Computers, PDAs

TYPICAL APPLICATIO

330k

Efficiency vs Load Current

PGOOD

100

0.1µF

= 1.5V

OUT

EXTV = 5V

5V TO 24V

= 5V

22µF

50V

×3

RUN/SS

IRF7811A

500pF

1µH

1.5V

15A

OUT

20k

0.33µF

= 15V

SGND BOOST

LTC3711

OUT

270µF

CMDSH-3

INTV

×4

IRF7811A

×2

UPS840

VID4

VID3

VID2

VID1

VID0

: UNITED CHEMICON

THCR70EIH226ZT

: CORNELL DUBILIER

ESRE271M02B

VCC

4.7µF

OUT

5-BIT VID

PGND

L1: SUMIDA CEP125-IROMC

3711 F01a

OSENSE

0.01

0.1

LOAD CURRENT (A)

3711 F01b

Figure 1. High Efficiency Step-Down Converter

3711f

12 3 4 5 6 7...24

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