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PDF SC2442 Data sheet ( Hoja de datos )
| Número de pieza | SC2442 | |
| Descripción | High Performance Wide Input Range Dual Synchronous Buck Controller | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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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
1 page  
SC2442/H
POWER MANAGEMENT
Pin Descriptions
www.DataSheet4U.com
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Pin Name
AVCC
BDI
VIN
OC1
EA1
FB1
SS1
BST1
GD1H
PH1
GD1L
PGND
PVCC
GD2L
PH2
GD2H
BST2
SS2
FB2
EA2
OC2
SYNC/EN
ROSC
AGND
Pin Function
Supply voltage for analog circuit.
Regulated by the BDI pin to 7V from VIN using an external PNP transistor.
Base drive for AVCC/PVCC regulator.
Input supply voltage. Maximum is 30V for SC2442 and 36V for SC2442H.
High side current sense for VOUT1. Threshold is 100 mV.
Error amplifier output for compensation for the VOUT1.
Feedback input for the VOUT1.
Soft start pin for VOUT1. A capacitor to AGND sets the soft start period.
Boost capacitor connection for the VOUT1 high side gate drive.
Connect an external capacitor and a diode as shown in the Typical Application Circuit.
Gate drive for the high side MOSFET of VOUT1. 180 degrees out of phase with GD2H.
Switching node for VOUT1 external inductor connection.
Gate drive for low side MOSFET of VOUT1.
Power ground for gate drive return currents.
Supply voltage for output drivers.
Gate drive for low side MOSFET of VOUT2.
Switching node for VOUT2 external inductor connection.
Gate drive for the high side MOSFET of VOUT2. 180 degrees out of phase with GD1H.
Boost capacitor connection for the VOUT2 high side gate drive.
Connect an external capacitor and a diode as shown in the Typical Application Circuit.
Soft start pin for VOUT2. A capacitor to AGND sets the soft start period.
Feedback input for the VOUT2.
Error amplifier output for compensation for the VOUT2.
High side current sense for VOUT2. Threshold is 100 mV.
Oscillator synchronization and PWM Enable pin.
Oscillator frequency programming pin. Connect a resistor to AGND to set clock frequency.
Analog signal ground.
© 2007 Semtech Corp.
5
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5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet SC2442.PDF ] | |
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