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參數資料
| 型號： | SC4607IMSTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | Very Low Input, MHz Operation, High Efficiency Synchronous Buck |
| 中文描述： | 非常低的輸入，兆赫操作，高效率同步降壓 |
| 文件頁數： | 1/17頁 |
| 文件大小： | 330K |
| 代理商： | SC4607IMSTRT |
1
www.semtech.com
SC4607
Very Low Input, MHz Operation,
High Efficiency Synchronous Buck
POWER MANAGEMENT
Description
The SC4607 is a voltage mode step down (buck) regula-
tor controller that provides accurate high efficiency power
conversion from an input supply range of 2.25V to 5.5V.
The SC4607 is capable of producing an output voltage
as low as 0.5V and has a maximum duty cycle of 97%. A
high level of integration reduces external component
count, and makes it suitable for low voltage applications
where cost, size, and efficiency are critical.
Revision: June 1, 2005
Features
Asynchronous start up
BiCMOS voltage mode PWM controller
Operation of frequency to 1MHz
2.25V to 5.5V input voltage range
Output voltages 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
Up to 97% duty cycle
1A peak current driver
10-pin MSOP package
Applications
Typical Application Circuit
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 SC4607 drives external, N-channel MOSFETs with a
peak gate current of 1A. The SC4607 prevents shoot
through currents by offering nonoverlap protection for
the gate drive signals of the external MOSFETs. The
SC4607 features lossless current 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 10μA. A 1.2ms soft start is internally provided
to prevent output voltage overshoot during start-up.
The SC4607 is an ideal choice for converting 2.5V, 3.3V,
5V or other low input supply voltages. It’s available in 10
pin MSOP package
*External components can be modified to provide a Vout as low as 0.5V
R3
C3
4.7u
C2
2.2n
C6
330u
R1
14.3k
C1
180p
C14
0.1u
Vin = 2.25V - 5.5V
R6
0
R5
0
D2
L1
1.8u
C5
22u
C4
22u
Vout = 1.5V (as low as 0.5V * ) / 12A
C71
1u
M1
C10
220u
M2
C12
22u
C9
4.7n
R8
200
R7
10k
R9
4.99k
C20
560pF
VCC
2
ISET
3
COMP
4
FS/SYNC
5
BST
1
DRVH
10
DRVL
8
VSENSE
6
GND
7
PHASE
9
U1
SC4607
C11
22u
R13
1
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相關代理商/技術參數 |
參數描述 |
|---|---|
| SC4608 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Low Input, MHz Operation, High Efficiency Synchronous Buck |
| SC4608EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Low Input, MHz Operation, High Efficiency Synchronous Buck |
| SC4608MLTRT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Low Input, MHz Operation, High Efficiency Synchronous Buck |
| SC4609 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Low Input, MHz Operation, High Efficiency Synchronous Buck |
| SC4609EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Low Input, MHz Operation, High Efficiency Synchronous Buck |
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