Datasheet > LTC3809

LTC3809

更新时间： 2023-12-20 18:46:22

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	291K
描述
No RSENSE?、低 EMI、同步 DC/DC 控制器

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LTC3809 数据手册

LTC3809

No R_SENSE™, Low EMI,

Synchronous DC/DC Controller

FEATURES

DESCRIPTION

TheLTC^®3809isasynchronousstep-downswitchingregu-

latorcontrollerthatdrivesexternalcomplementarypower

MOSFETs using few external components. The constant

No Current Sense Resistor Required

Selectable Spread Spectrum Frequency Modulation

for Low Noise Operation

Constant Frequency Current Mode Operation for

frequency current mode architecture with MOSFET V

Excellent Line and Load Transient Response

sensing eliminates the need for a current sense resistor

True PLL for Frequency Locking or Adjustment

and improves efﬁciency.

(Frequency Range: 250kHz to 750kHz)

Fornoisesensitiveapplications,theLTC3809canbeexter-

nallysynchronizedfrom250kHzto750kHz. BurstModeis

inhibitedduringsynchronizationorwhentheSYNC/MODE

pin is pulled low to reduce noise and RF interference. To

further reduce EMI, the LTC3809 incorporates a novel

spread spectrum frequency modulation technique.

Wide V Range: 2.75V to 9.8V

OUT

Wide V

Range: 0.6V to V

0.6V 1.5% Reference

Low Dropout Operation: 100% Duty Cycle

Selectable Burst Mode^®/Pulse-Skipping/Forced

Continuous Operation

Burst Mode operation provides high efﬁciency operation

at light loads. 100% duty cycle provides low dropout

operation, extending operating time in battery-powered

systems.

Auxiliary Winding Regulation

Internal Soft-Start Circuitry

Output Overvoltage Protection

Micropower Shutdown: I = 9μA

Tiny Thermally Enhanced Leadless (3mm × 3mm)

Theswitchingfrequencycanbeprogrammedupto750kHz,

allowing the use of small surface mount inductors and

capacitors.

DFN and 10-lead MSOP Packages

APPLICATIONS

The LTC3809 is available in tiny footprint thermally

enhanced DFN and 10-lead MSOP packages.

1- or 2-Cell Lithium-Ion Powered Devices

Portable Instruments

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

No R

is a trademark of Linear Technology Corporation.

SENSE

All other trademarks are the property of their respective owners.

Protected by U.S. Patents including 5481178, 5929620, 6580258, 6304066, 5847554,

6611131, 6498466. Other Patents pending.

Distributed DC Power Systems

TYPICAL APPLICATION

Efﬁciency and Power Loss vs Load Current

100

10k

EFFICIENCY

High Efﬁciency, 550kHz Step-Down Converter

= 3.3V

2.75V TO 9.8V

= 4.2V

= 5V

10μF

LTC3809

100

PLLLPF

POWER LOSS

= 4.2V

SYNC/MODE TG

59k

2.2μH

47μF

2.5V

OUT

15k

187k

FIGURE 10 CIRCUIT

RUN

IPRG

470pF

= 2.5V

OUT

GND

0.1

10000

100

1000

LOAD CURRENT (mA)

3809 TA01b

3809 TA01

3809fc

12 3 4 5 6 7...24

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