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SC2463
High Performance Quad Output
Switching Regulator
POWER MANAGEMENT
Revision: May 16, 2007
Description
Features
Applications
Typical Application Circuit
Two synchronized converters for low noise
Power up sequencing to prevent latch-up
Out of phase operation for low input ripple
Over current protection
Wide input range, 4.5 to 30V
Programmable frequency up to 700kHz
Low shutdown current 100uA
Two synchronous bucks for high efficiency at high
current
Two programmable positive linear regulators
Output voltage as low as 0.5V
Small package TSSOP-28. This product is fully
WEEE and RoHS compliant
The SC2463 is a high performance controller for multi-
output converters that can be configured for a wide vari-
ety of applications. The SC2463 utilizes PWM synchro-
nous buck topologies where efficiency is most important.
It also provides two dedicated programmable positive
linear regulators using external transistors. Each of the
four outputs is adjustable down to 0.5V. The two PWM
switchers are synchronized 180?out of phase reducing
input ripple, allowing for fewer input capacitors. Power
up sequencing prevents converter latch-up.
The SC2463 can be synchronized to other converters to
prevent beat frequencies. The wide range programmable
operating frequency allows users to optimize a converter
design. The PWM switchers sense the voltage across the
low-side MOSFETs on-resistance to efficiently provide
adjustable current-limit, eliminating costly current-sense
resistors. A POK signal is issued when soft-start is com-
plete on both PWM switchers and their outputs are within
10% of the set point.
DSL applications with multiple input voltage
requirements
Mixed-Signal applications requiring 4 positive
output voltages
Cable modem power management
Base station power management
+2.5V
R8
C8
R14
R16
C1
R18
C7
D1
Q1
C12
C3
R6
R5
C14
L2
+3.3V
C2
R17
Q4
R11
C13
R7
Q6
C20
C10
C15
+1.2V
C18
R4
C11
C19
C6
C17
Q3
R3
R1
(as low as 0.5V)
(as low as 0.5V)
Q7
L1
+3.3V
C16
+1.5V
R9
Q5
D2
+4.5-30V
R10
Q2
GD1L
23
PH1
24
GD1H
25
EO2
12
BST1
26
POK
8
SYNC
7
EO1
3
GD2L
20
FB1
2
BD4
4
FB2
13
PH2
19
GD2H
18
BST2
17
FB4
5
BD3
11
FB3
10
SS/SHDN
6
OSC
9
U1
SC2463
R12
R15
R13
C4
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