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參數資料
| 型號： | SC4603IMSTRT |
| 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： | 1/16頁 |
| 文件大小： | 328K |
| 代理商： | SC4603IMSTRT |
1
www.semtech.com
SC4603
Very Low Input, MHz Operation,
High Efficiency Synchronous Buck
POWER MANAGEMENT
Description
Revision: May 5, 2004
Features
Applications
Distributed power architecture
Servers/workstations
Local microprocessor core power supplies
DSP and I/O power supplies
Battery powered applications
Telecommunication equipment
Data processing applications
Typical Application Circuit
BICMOS voltage mode PWM controller
2.25V to 5.5V Input voltage range
Output voltages as low as 0.5V
Sleep mode (Icc = 10μA typ)
Lossless adjustable overcurrent protection
Combination pulse by pulse & hiccup mode current
limit
High efficiency synchronous switching
0% to 100% Duty cycle range
Synchronization to external clock
Asynchronous start-up
1MHz frequency of operation
10-Pin MSOP surface mount package
The SC4603 is a voltage mode step down (buck) regula-
tor controller that provides accurate high efficiency power
conversion from input supply range 2.25V 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 SC4603 drives external complementary power
MOSFETs; P-channel on the high side and N-channel on
the low side. The use of high side P-channel MOSFETs
eliminates the need for an external charge pump and
simplifies the high side gate driver. Non-overlap protec-
tion is provided for the gate drive signals to prevent shoot
through of the MOSFET pair. The voltage drop across the
P-channel MOSFET during its conduction is sensed for
lossless short circuit current limiting.
A low power sleep mode can be achieved by forcing the
SYNC/SLEEP pin below 0.8V. A synchronous mode of op-
eration is activated as the SYNC/SLEEP pin is driven by
an external clock. The quiescent supply current in sleep
mode is typically lower than 10
μ
A. A 1.7ms soft start is
internally provided to prevent output voltage overshoot
during start-up. A 100% maximum duty cycle allows the
SC4603 to operate as a low dropout regulator in the
event of a low battery condition.
The SC4603 is an ideal choice for 3.3V, 5V or other low
input supply systems. It’s available in 10 pin MSOP
package.
* External components can be modified to provide a Vout as low as 0.5V.
VCC
1
SYNC
2
COMP
3
VSENSE
4
FS
5
ISET
6
PHASE
7
GND
8
NDRV
9
PDRV
10
U1
SC4603
R15
1
C3
4.7u
C7
150u
C14
33n
R6
1.0
R5
1.0
R9
6.98k
Vout = 1.5V (as low as 0.5V * ) /6A
M2
C10
22u
C11
22u
C12
22u
Vin = 2.25V ~ 5.5V
C13
22u
C4
22u
RT
34.8k
C1
150p
C2
1n
R1
20k
R3
L1
2.3u
C9
1.2n
R8
806
M1
R7
14k
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