SC2442
SC2442 is High Performance Wide Input Range Dual Synchronous Buck Controller manufactured by SEMTECH.
Description
SC2442 and SC2442H are high performance dual buck converter controllers that can be configured for a variety of synchronous buck applications where efficiency is most important. Both converters are synchronized to prevent beat frequencies. The dual buck converters are also operated out of phase reducing input ripple, allowing for fewer input capacitors.
High frequency operation up to 1.1 MHz reduces the size of output inductors and capacitors. The controller has separate power pins for both VCC and GND to improve noise immunity. The VCC supplies can be regulated to 7V using an external PNP transistor. Other Features include: bootstrapping for high side drive supplies, asynchronous mode start up, power up sequencing to prevent latchups, individual soft start for each convertor, bootstrapped drivers for high side N-channel MOSFETs, input side current sensing, dual mode current limit with hiccup, enable and external frequency synchronization.
The SC2442 operates over the range of 4.75V to 30V and SC2442H operates over the range of 4.75V to 36V.
Typical Application Circuit
Features
Dual output controller Asynchronous start up mode Power up sequencing to prevent latch-ups Out of phase operation for low input ripple Over current protection Output down to 0.75V Wide input range, 4.75 to 30V for SC2442 and
4.75 to 36V for SC2442H Vcc regulator with external PNP transistor Programmable clock frequency up to 1.1MHz Two synchronous bucks for high efficiency at high current
- 40 to +125 Deg C operating temperature Small package TSSOP-24 Fully WEEE and Ro HS pliant
Applications
Point of load converter applications DSL applications with multiple output voltages Power management for mixed signal applications Cable modems and set top boxes.
VIN+ MAX 30V/36V (H)
R1
R2
C1 Q5
C6 R9
C7
R3
R4
OC1 OC2
C4
C5
C8 C9 R1 2
R10
SS1 SS2 OSC
AVCC PVCC
3 VIN 2 BDI
U1 OC1 4 OC 2 21
1 AVCC
GD1H...
