SC2449 Datasheet, PDF (1/20 Pages) Semtech Corporation – BI PHASE DUAL CONTROLLER

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
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