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SC4608 Datasheet(PDF) 1 Page - Semtech Corporation

Part No. SC4608
Description  Low Input, MHz Operation, High Efficiency Synchronous Buck
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Maker  SEMTECH [Semtech Corporation]
Homepage  http://www.semtech.com
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SC4608 Datasheet(HTML) 1 Page - Semtech Corporation

 
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SC4608
Low Input, MHz Operation,
High Efficiency Synchronous Buck
POWER MANAGEMENT
Revision: June 19, 2006
Description
Features
Applications
Typical Application Circuit
Asynchronous start up
Programmable switching frequency up to 1MHz
BiCMOS voltage mode PWM controller
2.7V to 5.5V input voltage range
Output voltage as low as 0.5V
+/-1% reference accuracy
Sleep mode (Icc = 1µA max)
Adjustable lossless short circuit current limiting
Combination pulse by pulse & hiccup mode
current limit
High efficiency synchronous switching
1A peak current driver
External soft start
Power good signal
16-pin MLP Lead-free package. This product is fully
WEEE and RoHS compliant
Distributed power architecture
Servers/workstations
Local microprocessor core power supplies
DSP and I/O power supplies
Battery-powered applications
Telecommunications equipment
Data processing applications
The SC4608 is a voltage mode step down (buck) regula-
tor controller that provides accurate high efficiency power
conversion from an input supply range of 2.7V to 5.5V. A
high level of integration reduces external component
count, and makes it suitable for low voltage applications
where cost, size and efficiency are critical. The SC4608
is capable of producing an output voltage as low as 0.5V.
It’s frequency of operation is programmable to 1MHz.
The SC4608 drives external, N-channel MOSFETs with a
peak gate current of 1A. A non-overlap protection is pro-
vided for the gate drive signals to prevent shoot through
of the MOSFET pair. The SC4608 features lossless cur-
rent sensing of the voltage drop across the drain to
source resistance of the high side MOSFET during its
conduction period.
The quiescent supply current in sleep mode is typically
lower than 1µA. A external soft start is provided to pre-
vent output voltage overshoot during start-up.
The SC4608 is an ideal choice for converting 3.3V, 5V or
other low input supply voltages. It’s available in 16 pin
MLP package.
R3
C3
1u
C2 2.2n
R1
14.3k
C1
180p
V
out= 0.5V / 12A
C17
1u
D2
L1
1.8u
C5
22u
C4
22u
M11
C10
220u
M2
C9
4.7n
R8
200
R7
10k
V
in=3V – 3.6V
R6
1
R5
1
C16
560pF
AVDD
1
ISET
2
COMP
3
FSET
4
PVDD
16
BST
15
PHASE
12
SS
7
VSENSE
8
DRVH
13
PGOOD
6
EN
5
AGND
9
PGND
10
DRVL
11
SC4608
R2
10k
C6
330u
C13
22u
C14
22u
R13
1
22n
Css
R3
C3
1u
C2 2.2n
R1
14.3k
C1
180p
V
out= 0.5V / 12A
C17
1u
D2
L1
1.8u
C5
22u
C4
22u
M11
C10
220u
M2
C9
4.7n
R8
200
R7
10k
V
in=3V – 3.6V
R6
1
R5
1
C16
560pF
AVDD
1
ISET
2
COMP
3
FSET
4
PVDD
16
BST
15
PHASE
12
SS
7
VSENSE
8
DRVH
13
PGOOD
6
EN
5
AGND
9
PGND
10
DRVL
11
SC4608
R2
10k
C6
330u
C13
22u
C14
22u
R13
1
22n
Css


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