ltc3704ems-trpbf Linear Technology Corporation, ltc3704ems-trpbf Datasheet

ltc3704ems-trpbf

Manufacturer Part Number

ltc3704ems-trpbf

Description

Wide Input Range, No Rsense Positive-to-negative Dc/dc Controller

Manufacturer

Linear Technology Corporation

Datasheet

1.LTC3704EMS-TRPBF.pdf (28 pages)

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FEATURES

■

APPLICATIO S

■

TYPICAL APPLICATIO

SLIC Power Supplies

Telecom Power Supplies

Portable Electronic Equipment

Cable and DSL Modems

Router Supplies

High Efficiency Operation (No Sense

Resistor Required)

Wide Input Voltage Range: 2.5V to 36V

Current Mode Control Provides Excellent Transient

Response

High Maximum Duty Cycle (Typ 92%)

±1% Internal Voltage Reference

±2% RUN Pin Threshold with 100mV Hysteresis

Micropower Shutdown: I

Programmable Switching Frequency

(50kHz to 1MHz) with One External Resistor

Synchronizable to an External Clock Up to 1.3 × f

User-Controlled Pulse Skip or Burst Mode

Internal 5.2V Low Dropout Voltage Regulator

Capable of Operating with a Sense Resistor for High

Output Voltage Applications (V

Small 10-Lead MSOP Package

4.7nF

OUT

VCC

, C

: TDK C5750X5R0J107M

: TAIYO YUDEN LMK316BJ475ML

: TDK C5750X5R1C476M

Figure 1. High Efficiency Positive to Negative Supply

80.6k

1.21k

FB1

RUN

NFB

FREQ

MODE/SYNC

LTC3704

3.65k

FB2

= 10μA

INTV

SENSE

GATE

GND

D1: MBRD835L (ON SEMICONDUCTOR)

L1, L2: BH ELECTRONICS BH510-1009

M1: Si4884 (SILICONIX/VISHAY)

>36V)

4.7μF

VCC

Positive-to-Negative DC/DC Controller

Operation

47μF

L1*

•

47μF

OSC

•

L2*

DESCRIPTIO

The LTC

positive-to-negative DC/DC controller that drives an

N-channel power MOSFET and requires very few external

components. Intended for low to high power applications,

it eliminates the need for a current sense resistor by

utilizing the power MOSFET’s on-resistance, thereby maxi-

mizing efficiency.

The IC’s operating frequency can be set with an external

resistor over a 50kHz to 1MHz range, and can be synchro-

nized to an external clock using the MODE/SYNC pin.

Burst Mode operation at light loads, a low minimum

operating supply voltage of 2.5V and a low shutdown

quiescent current of 10μA make the LTC3704 ideally

suited for battery-operated systems.

For applications requiring constant frequency operation,

the Burst Mode operation feature can be defeated using

the MODE/SYNC pin. Higher than 36V switch voltage

applications are possible with the LTC3704 by connecting

the SENSE pin to a resistor in the source of the power

MOSFET.

The LTC3704 is available in the 10-lead MSOP package.

Mode is a registered trademark of Linear Technology Corporation. No R

registered trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners. Protected by U.S. Patents including 5847554, 5731694.

Wide Input Range, No R

3704 TA01

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

100μF

(X2)

GND

–5.0V

OUT

5V to 15V

3A to 5A

OUT

3704 is a wide input range, current mode,

100

0.001

Conversion Efficiency

0.01

= 5V

OUTPUT CURRENT (A)

= 10V

= 15V

0.1

1.0

LTC3704

3704 TA01b

SENSE

is a

3704fb

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