SC4612H Datasheet, PDF (1/21 Pages) Semtech Corporation – 40V Synchronous Buck Controller

SC4612H
40V Synchronous Buck Controller
POWER MANAGEMENT
Description
SC4612H is a high performance synchronous buck
controller that can be configured for a wide range of
applications. The SC4612H utilizes synchronous rectified
buck topology where high efficiency is the primary
consideration. SC4612H can be used over a wide input
voltage range with output voltage adjustable within limits
set by the duty cycle boundaries.
SC4612H comes with a rich set of features such as
regulated DRV supply, programmable soft-start, high
current gate drivers, shoot through protection,
sensing with hiccup over current protection.
R_DS-ON
Typical Application Circuit
Features
u Wide input voltage range, 4.75V to 40V
u Internally regulated DRV
u 1.7A gate drive capability
u Low side R_DS-ON sensing with hiccup OCP
u Programmable current limit
u Programmable frequency up to 1.2 MHz
u Overtemperature protected
u Pre-bias startup
u Reference accuracy ±1%
u Available in MLPD-12 4 x 3 and SOIC-14 Pb-free
packages. This product is fully WEEE and RoHS
compliant
Applications
u Distributed power architectures
u Telecommunication equipment
u Servers/work stations
u Mixed signal applications
u Base station power management
u Point of use low voltage high current applications
+
Vin
Ci n
_
R1
adj
C1
C2
C3
R2
C4
Ro _p3t
C5
U1
S C4612MLP
1
I LIM
PHASE
12
2
OSC
DH
11
3
SS/E N
BST
10
4
EA O
DRV
9
5
FB
DL
8
6
VDD
GND
7
R5
R4
R6
C6
D1
C8
C7
Q1
L1
Q2
C9
C10
C11
+
Vout
_
Revision: August 14, 2008
1
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