SC4607 Datasheet PDF - Semtech Corporation
| Part Number | SC4607 | |
| Description | High Efficiency Synchronous Buck | |
| Manufacturers | Semtech Corporation | |
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POWER MANAGEMENT
Description
SC4607
Very Low Input, MHz Operation,
High Efficiency Synchronous Buck
Features
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.
www.DataSheet4U.com
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.
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
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
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
R3 C14
0.1u
C1 C2 2.2n
180p
R1
14.3k
R13
1
C3
4.7u
C20
560pF
D2
1u
C71
U1
1 BST
DRVH
2 VCC
PHASE
3 ISET
DRVL
4 COMP
GND
5 FS/SYNC VSENSE
SC4607
10
9
8
7
6
R6
0
R5
0
Vin = 2.25V - 5.5V
C10 C11
C12
220u 22u 22u
M1
L1
1.8u
M2
Vout = 1.5V (as low as 0.5V * ) / 12A
C6
330u
C5 C4 C9
22u 22u 4.7n R7
10k
R8
200
*External components can be modified to provide a Vout as low as 0.5V
R9
4.99k
Revision: June 1, 2005
1
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SC4607
POWER MANAGEMENT
Pin Descriptions (Cont.)
Pin #
Pin Name Pin Function
8 DRVL
9 PHASE
www.DataSheet4U.com
10 DRVH
Gate drive pin. DRVL drives the gate of the low side (synchronous rectifier) MOSFET. The
output driver is rated for 1A peak current. The PWM circuitry provides complementary drive
signals to the output stages. The cross conduction of the external MOSFETs is prevented
by monitoring the voltage on the DRVH and DRVL driver pins of the MOSFET pair in
conjunction with a time delay optimized for FET turn-off characteristics
The PHASE pin is used to limit current in the high side MOSFET. The SC4607 uses the
voltage across the Vin and ISET pins in order to set the current limit. The current limit
threshold is set by the value of an external resistor (R3 in the Typical Application Circuit
Diagram). Current limiting is performed by comparing the voltage drop across the sense
resistor with the voltage drop across the drain to source resistance of the high side
MOSFET during the MOSFET’s conduction period. The voltage drop across the drain to
source resistance of the high side MOSFET is obtained from the Vin and PHASE pins.
Gate drive pin. DRVH drives the gate of the high side (main switch) MOSFET. The output
driver is rated for 1A peak current. The PWM circuitry provides complementary drive
signals to the output stages. The cross conduction of the external MOSFETs is prevented
by monitoring the voltage on the DRVH and DRVL driver pins of the MOSFET pair in
conjunction with a time delay optimized for FET turn-off characteristics
2005 Semtech Corp.
5
www.semtech.com
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for SC4607 electronic component. |
| Information | Total 17 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ SC4607.PDF Datasheet ] | |
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