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SC2442H Datasheet Preview

SC2442H Datasheet

High Performance Wide Input Range Dual Synchronous Buck Controller

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SC2442/H
High Performance Wide Input Range
Dual Synchronous Bwuwwc.DkataCShoeent4tU.rcoomller
POWER MANAGEMENT
Description
Features
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 latch-
ups, 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
‹ 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 RoHS Compliant
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
RTN
R9
C6
C7
R3 R4
OC1
OC2
C4
C5
C8
C9
R1 2
RTN
R10
SS1
SS2
OSC
AVCC
PVCC
3 VIN
2 BDI
U1 OC1 4
OC 2 21
1 AVCC
GD1H 9
13 P VC C
G D 1L 11
7 SS1
G D 2H 16
18 S S 2
G D 2L 14
23 ROS C
P H 1 10
6 FB1
BST1 8
5 E A1
P H 2 15
19 FB2
BS T 2 17
20 E A2
P G ND 12
22 S YN C /E N AG ND 24
Q1
R5
Q3
R7
D1 D2
R6
R8
Q2
Q4
PH1
BST1
PH2
BST2
C15
C1 6
R11
C10
C1 1
EA2
ENA
R17
FB1
C1 2
R18 C13
FB2
L1
C2
VOUT1
RTN
L2
VOUT2
C3
RTN
R13
R1 4
R15 R16
RTN
Revision: June, 2007
1
www.semtech.com




Semtech Corporation

SC2442H Datasheet Preview

SC2442H Datasheet

High Performance Wide Input Range Dual Synchronous Buck Controller

No Preview Available !

SC2442/H
POWER MANAGEMENT
Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction.
Operation outside of the parameters specified in the Electrical Characteristics section is not implied.
www.DataSheet4U.com
Parameter
Symbol
Maximum
Units
BST1, BST2 to PGND
SC2442
SC2442H
VIN to PGND
SC2442
SC2442H
BDI to PGND
OC1 and OC2 to VIN
PVCC, AVCC to PGND
VBST1, VBST2
VIN
VBDI
VIN - VOC1, VIN - VOC2
PVCC, AVCC
38
44
30
36
VIN
-0.3 to +0.5
8
V
V
V
V
V
BST1 to PH1, BST2 to PH2
GD1H to PH1, GD2H to PH2
GD1L, GD2L to PGND
-0.3 to 8
-0.3 to PVCC
V
V
PGND to AGND
±0.3 V
PH1, PH2 -ve swing wrt PGND (for 100 nS)
All Other Pins to AGND
VPH1, VPH2
-1
-0.3 to AVCC
V
V
Junction Temperature
-40 to +125
°C
Storage Temperature Range
-60 to +150
°C
Lead Temperature (Soldering) 10 Sec.
260 °C
Electrical Characteristics
Unless specified: T = T = -40 to 125°C, VIN = 24V, V = 7V, Fc = 550KHz
AJ
CC
Parameter
Symbol
Test Conditions
Undervoltage Lockout
Start Threshold
UVLO Hysteresis
Power Supply
VUVLO
VHYST
AVCC rising
AVCC falling
Operating Current
AVCC/PVCC Regulated
IQSC
AVCC, PVCC
No load, SYNC/EN = Low
VIN > 8V
BDI Drive Current
IBDI VIN > AVCC + 2V
Min Typ Max Unit
4.5 4.6 4.75
0.15
V
V
8 13 mA
6.7 7.0 7.3 V
35
mA
© 2007 Semtech Corp.
2
www.semtech.com


Part Number SC2442H
Description High Performance Wide Input Range Dual Synchronous Buck Controller
Maker Semtech Corporation
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SC2442H Datasheet PDF






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