SC2449ISWTR View Datasheet(PDF) - Semtech Corporation

Part Name

Description

MFG CO.

SC2449ISWTR

BI-Phase/Dual Controller

Semtech Corporation 

SC2449

BI-Phase/Dual Controller

POWER MANAGEMENT

Description

.eatures

The SC2449 can be configured as a dual converter or a

bi-phase converter for high current applications. The part

is designed for point of use power supplies with 8.5-28V

nominal backplane power sources. Multiple supplies can

be synchronized together to prevent low frequency har-

monics on the backplane. The power dissipation is con-

trolled using a novel low voltage supply technique, allow-

ing high speed and integration, with the high drive cur-

rents to ensure low MOS.ET switching loss.

The use of high speed switching circuits allows very nar-

row PWM outputs down to 15:1 voltage ratios. Single

pin compensation for each channel simplifies develop-

ment as well as reducing external pin count.

K Selectable dual output or bi-phase operation

K Direct drive for N-channel MOS.ETs

K Undervoltage lockout

K Synchronization to external clock

K Multi-converter synchronization

K Soft start

K .ast transient response

K Max duty cycle 45%

K Output over voltage protection

K Thermal shutdown

Applications

Capable of driving MOS.ETs via external driver transis- K Power supplies for advanced telecoms/datacoms

tors for phase currents beyond 20A.

K SO IP, Ethernet and PABX power supplies

Typical Application Circuit

Revision 4, May 2002

1

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