Datasheet > LTC3869-2

LTC3869-2

更新时间： 2024-02-10 22:12:50

品牌	Logo	应用领域
凌特 - Linear		控制器
页数	文件大小	规格书
32页	388K
描述
2-Phase, High Efficiency DC/DC Controller for Intel Mobile CPUs

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LTC3869-2 数据手册

LTC3735

2-Phase, High Efficiency

DC/DC Controller for

Intel Mobile CPUs

FEATURES

DESCRIPTION

The LTC^®3735 is a 2-phase synchronous step-down

switching regulator controller that drives all N-channel

power MOSFETs in a constant frequency architecture. The

output voltage is programmable by six VID bits during

normal operation and by external resistors during initial

boot-upanddeepersleepstate.TheLTC3735drivesitstwo

output stages out-of-phase at frequencies up to 550kHz

to minimize the RMS ripple currents in both input and

output capacitors. This antiphase technique also doubles

the apparent switching frequency, improving the transient

response while operating each phase at an optimum fre-

quency for efficiency. Thermal design is further simplified

bycycle-by-cyclecurrentsharingbetweenthetwophases.

Output Stages Operate Antiphase

1ꢀ Output ꢁoltage Accuracy

6-Bit IMꢁP-Iꢁ ꢁID Code: ꢁ

= 0.7ꢁ to 1.708ꢁ

OUT

Intel Compatible Power Saving Mode (PSIB)

Stage Shedding Improves Low Current Efficiency

Power Good Output with Adaptive Masking

Lossless ꢁoltage Positioning

Dual Input Supply Capability for Load Sharing

Resistor Programmable V

Sleep State

at Boot-Up and Deeper

OUT

Resistor Programmable Deep Sleep Offset

Programmable Fixed Frequency: 210kHz to 550kHz

Adjustable Soft-Start Current Ramping

Foldback Output Current Limit

Short-Circuit Shutdown Timer with Defeat Option

Overvoltage Protection

AnIntelcompatiblePSIBinputisprovidedtoselectbetween

two modes of operation. Fully enhanced synchronous

mode achieves a very small output ripple and very fast

transient response while power saving mode realizes

very high efficiency. OPTI-LOOP^®compensation allows

the transient response to be optimized for a wide range

of output capacitance and ESR values.

Available in 36-Lead SSOP (0.209 Wide) and 38-Lead

(5mm × 7mm) Packages

APPLICATIONS

Mobile and Desktop Computers

Internet Servers

L, LT, LTC, LTM, OPTI-LOOP, PolyPhase, Linear Technology and the Linear logo are registered

trademarks of Linear Technology Corporation. All other trademarks are the property of their

respective owners.

TYPICAL APPLICATION

MCH_PG

DPRSLPVR

STP_CPUB

PSIB

TG1

SW1

1µH

0.002Ω

5V TO 24V

BG1

FREQSET

PGND

VID5-VID0

OUT

–

0.7V TO 1.708V

40A

PGOOD SENSE1

SENSE1

OUT

330µF

10µF

35V

×4

100pF

RUN/SS

TG2

SW2

BG2

4.74k

1µH

×5

232k

0.1µF

470pF

SGND

LTC3735

–

SENSE2

4.5V TO 7V

13.3k

4.7µF

12.7k

RBOOT

BAT54A

56.2k

13.3k

BOOST1 RDPRSLP

1.27M

549k

BOOST2

RDPSLP

0.47µF

OAOUT

–

SW2

SW1

3735 F01

Figure 1. High Current 2-Phase Step-Down Converter

3735fa

12 3 4 5 6 7...32

中文翻译

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与LTC3869-2相关器件

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LTC3869-2_15	Linear	获取价格	Dual, 2-Phase Synchronous Step-Down DC/DC Controllers
LTC3869EUFD#PBF	Linear	获取价格	LTC3869 - Dual, 2-Phase Synchronous Step-Down DC/DC Controllers; Package: QFN; Pins: 28; T
LTC3869EUFD#TRPBF	Linear	获取价格	LTC3869 - Dual, 2-Phase Synchronous Step-Down DC/DC Controllers; Package: QFN; Pins: 28; T
LTC3869EUFDPBF	Linear	获取价格	Dual, 2-Phase Synchronous Step-Down DC/DC Controllers
LTC3869IGN-2#PBF	Linear	获取价格	暂无描述
LTC3869IGN-2#TRPBF	Linear	获取价格	LTC3869 - Dual, 2-Phase Synchronous Step-Down DC/DC Controllers; Package: SSOP; Pins: 28;
LTC3869IGN-2PBF	Linear	获取价格	Dual, 2-Phase Synchronous Step-Down DC/DC Controllers
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