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SC4603 Datasheet(PDF) 1 Page - Semtech Corporation

Part No. SC4603
Description  Very 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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SC4603 Datasheet(HTML) 1 Page - Semtech Corporation

 
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SC4603
Very Low Input, MHz Operation,
High Efficiency Synchronous Buck
POWER MANAGEMENT
Revision: May 5, 2004
Description
Features
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
Distributed power architecture
Servers/workstations
Local microprocessor core power supplies
DSP and I/O power supplies
Battery powered applications
Telecommunication equipment
Data processing applications
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 10µA. 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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