Datasheet > LTC3720

LTC3720

更新时间： 2023-12-20 18:46:07

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	296K
描述
单相 VRM8.5 电流模式降压型控制器

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LTC3720 数据手册

LTC3720

Single Phase VRM8.5

Current Mode Step-Down Controller

FEATURES

DESCRIPTIO

■

5-Bit Programmable Output Voltage:

The LTC^®3720 is a synchronous step-down switching

regulator controller for CPU power. An output voltage

between 1.05V and 1.825V is selected by a 5-bit code

(Intel VRM8.5 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-

1.05V to 1.825V (VRM8.5)

■

No Sense Resistor Required

■

2% to 87% Duty Cycle at 200kHz

■

t_ON(MIN)≤ 100ns

■

Supports Active Voltage Positioning

True Current Mode Control

Stable with Ceramic C_OUT

sated for variations in V_INand V_OUT.

Dual N-Channel MOSFET Synchronous Drive

Power Good Output Voltage Monitor

Wide V_INRange: 4V to 36V

±1% 0.8V Reference

Adjustable Current Limit

Adjustable Switching Frequency

Forced Continuous Control Pin

Programmable Soft-Start

Output Overvoltage Protection

Optional Short-Circuit Shutdown Timer

Micropower Shutdown: I_Q< 30µA

^{Available in 28-L}U^{ead Narrow SSOP Package}

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.

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 also user

programmable. Wide supply range allows operation from

4V to 36V at the input.

, 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.

APPLICATIO S

■

Power Supplies for Pentium^®Processors

Notebook Computers and Servers

■

TYPICAL APPLICATIO

LTC3720

PGOOD

330k

Efficiency vs Output Current

100

= 1.45V

OUT

L1 = 1µH

0.1µF

5V TO 24V

10µF

×5

IRF7811W

RUN/SS

×2

470pF

1µH

= 5V

OUT

1.05V TO 1.825V

20A

20k

0.33µF

OUT

SGND BOOST

= 15V

270µF

CMDSH-3

INTV

×4

UPS840

VID4

VID3

VID2

VID1

VID0

SENSE

4.7µF

IRF7811W

×3

OUT

: CORNELL DUBILIER

ESRE271M02B

L1: SUMIDA CEP125-IROMC

5-BIT VID

PGND

SENSE¯

3720 F01a

OSENSE

0.01

100

0.1

OUTPUT CURRENT (A)

3720 F01b

Figure 1. High Efficiency Step-Down Converter

3720f

12 3 4 5 6 7...24

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