LTC1628IGTRPBF Linear Technology Corporation, LTC1628IGTRPBF Datasheet

LTC1628IGTRPBF

Manufacturer Part Number

LTC1628IGTRPBF

Description

SSOP-28

Manufacturer

Linear Technology Corporation

Datasheets

1.LTC1628IGTRPBF.pdf (32 pages)

2.LTC1628IGTRPBF.pdf (32 pages)

Specifications of LTC1628IGTRPBF

Date_code

05+

Current page: 1 of 32
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FEATURES

TYPICAL APPLICATIO

APPLICATIO S

Out-of-Phase Controllers Reduce Required Input

Capacitance and Power Supply Induced Noise

OPTI-LOOP

Dual N-Channel MOSFET Synchronous Drive

Power Good Output Voltage Monitor (LTC1628-PG)

DC Programmed Fixed Frequency 150kHz to 300kHz

Wide V

Very Low Dropout Operation: 99% Duty Cycle

Adjustable Soft-Start Current Ramping

Foldback Output Current Limiting

Latched Short-Circuit Shutdown with Defeat Option

Output Overvoltage Protection

Remote Output Voltage Sense

Low Shutdown I

5V and 3.3V Standby Regulators

Selectable Constant Frequency or Burst Mode

Operation

Available in 5mm 5mm QFN and

28-Pin SSOP Packages

Notebook and Palmtop Computers, PDAs

Battery Chargers

Portable Instruments

Battery-Operated Digital Devices

DC Power Distribution Systems

1% Output Voltage Accuracy

Range: 3.5V to 36V Operation

Compensation Minimizes C

OUT1

Synchronous Step-Down Switching Regulators

: 20 A

M1, M2, M3, M4: FDS6680A

0.01

SENSE1

47 F

OUT1

6.3 H

105k

Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter

20k

OUT

, 0.1 F

4.7 F

15k

1000pF

220pF

0.1 F

SS1

TG1

BOOST1

SW1

BG1

SGND

SENSE1

TH1

RUN/SS1

OSENSE1

DESCRIPTIO

The LTC

step-down switching regulator controllers that drive all

N-channel synchronous power MOSFET stages. A con-

stant frequency current mode architecture allows adjust-

ment of the frequency up to 300kHz. Power loss and noise

due to the ESR of the input capacitors are minimized by

operating the two controller output stages out of phase.

OPTI-LOOP compensation allows the transient response

to be optimized over a wide range of output capacitance and

ESR values. The precision 0.8V reference and power good

output indicator are compatible with future microproces-

sor generations, and a wide 3.5V to 30V (36V maximum)

input supply range encompasses all battery chemistries.

A RUN/SS pin for each controller provides both soft-start

and optional timed, short-circuit shutdown. Current

foldback limits MOSFET dissipation during short-circuit

conditions when overcurrent latchoff is disabled. Output

overvoltage protection circuitry latches on the bottom

MOSFET until V

can select among Burst Mode, constant frequency mode

and continuous inductor current mode or regulate a

secondary winding. The LTC1628-PG includes a power

good output pin that replaces the FLTCPL, fault coupling

control pin of the LTC1628.

OPTI-LOOP and Burst Mode are registered trademarks of Linear Technology Corporation.

LTC1628

–

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

RUN/SS2

INTV

SENSE2

BOOST2

OSENSE2

High Efficiency, 2-Phase

PGND

SW2

TG2

BG2

TH2

0.1 F

–

SS2

1628/LTC1628-PG are high performance dual

LTC1628/LTC1628-PG

1000pF

220pF

OUT

15k

, 0.1 F

1 F

CERAMIC

returns to normal. The FCB mode pin

20k

63.4k

22 F

50V

CERAMIC

6.3 H

5.2V TO 28V

SENSE2

56 F

0.01

OUT

1628 F01

3.3V

OUT2

1628fb

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