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參數資料
| 型號： | SC4609 |
| 廠商： | Semtech Corporation |
| 英文描述： | Low Input, MHz Operation, High Efficiency Synchronous Buck |
| 中文描述： | 低投入，兆赫操作，高效率同步降壓 |
| 文件頁數： | 1/18頁 |
| 文件大小： | 334K |
| 代理商： | SC4609 |
1
www.semtech.com
SC4609
Low Input, MHz Operation,
High Efficiency Synchronous Buck
POWER MANAGEMENT
Description
The SC4609 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 SC4609
is capable of producing an output voltage as low as 0.5V.
Revision: February 8, 2006
Features
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 = 10μA typ)
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
12-pin MLP Lead-free package, fully WEEE and RoHS
compliant
Applications
Distributed power architecture
Servers/workstations
Local microprocessor core power supplies
DSP and I/O power supplies
Battery-powered applications
Telecommunications equipment
Data processing applications
Typical Application Circuit
The SC4609 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 SC4609 features lossless cur-
rent sensing of the voltage drop across the drain to
source resistance of the high side MOSFET during its
conduction period. Its switching frequency can be pro-
grammed up to 1MHz.
The quiescent supply current in sleep mode is typically
lower than 10
μ
A. A external soft start is provided to pre-
vent output voltage overshoot during start-up.
The SC4609 is an ideal choice for converting 3.3V, 5V or
other low input supply voltages. It’s available in 12 pin
MLP package.
R3
4.7u
C2
2.2n
R1
14.3k
C1
180p
D2
L1
1.8u
C5
22u
C4
22u
Vout=1.5V (as low as 0.5V*) / 12A
C17
1u
M11
C10
220u
M2
C9
4.7n
200
10k
R9
4.99k
Vin=2.7V - 5.5V
R6
1
R5
1
C16
560pF
VCC
1
ISET
2
COMP
3
FSET
4
BST
12
DRVH
11
DRVL
9
AGND
7
PGND
8
PHASE
10
SS
6
VSENSE
5
U1
SC4609
C6
330u
C13
22u
C14
22u
1
Css
22u
*External components can be modified to provide a Vout as low as 0.5V
C3
R8
R7
R13
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