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參數資料
| 型號： | SC4605IMSTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | Low Input, High Efficiency Synchronous, Step Down Controller |
| 中文描述： | 低投入，高效率同步，降壓控制器步驟 |
| 文件頁數： | 1/19頁 |
| 文件大?。?/td> | 429K |
| 代理商： | SC4605IMSTRT |
1
www.semtech.com
SC4605
Low Input, High Efficiency
Synchronous, Step Down Controller
POWER MANAGEMENT
Description
Revision: October 14, 2004
Features
Applications
Typical Application Circuit
BICMOS voltage mode PWM controller
2.8V to 5.5V Input voltage range
Output voltages as low as 0.8V
+/-1% Reference accuracy
Sleep mode (Icc = 10μA typ)
Lossless adjustable short circuit current limiting
Combination pulse by pulse & hiccup mode
current limit
High efficiency synchronous switching
0% to 97% Duty cycle range
1A Peak current driver
10-Pin MSOP package
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 SC4605 is a voltage mode step down (buck) regula-
tor controller that provides accurate high efficiency power
conversion from a input supply range of 2.8V 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 SC4605 drives external N-channel MOSFETs with 1A
peak current. A non-overlap protection is provided for
the gate drive signals to prevent shoot through of the
MOSFET pair. The voltage drop across the high side
MOSFET during its conduction is sensed for lossless short
circuit current limiting.
The quiescent supply current in sleep mode is typically
lower than 10
μ
A. A 1.8ms soft start is internally provided
to prevent output voltage overshoot during start-up.
The SC4605 is an ideal choice for 3.3V, 5V or other low
input supply systems. It’s available in 10 pin MSOP pack-
age.
*
External components can be modified to provide a Vout as low as 0.8V.
R3
4.7u
C2
2.2n
C6
330u
R1
14.3k
C1
180p
C14
0.1u
Vin = 2.8V - 5.5V
D2
L1
1.8u
C5
22u
C4
22u
Vout = 1.5V (as low as 0.8V * ) / 12A
C71
1u
M1
C10
220u
M2
C12
22u
4.7n
200
10k
R9
11.5k
C20
470pF
U1
SC4605
VCC
2
ISET
3
COMP
4
FS/SYNC
5
BST
1
DRVH
10
DRVL
8
VSENSE
6
GND
7
PHASE
9
C11
22u
1
C3
C9
R8
R7
R13
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相關代理商/技術參數 |
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| SC4607IMSTR | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Very Low Input, MHz Operation, High Efficiency Synchronous Buck |
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