SC4624A Datasheet, PDF (1/19 Pages) Semtech Corporation – Low Input Voltage, High Efficiency, 4A Integrated FET Synchronous Step down DC/DC Regulator

SC4624A
Low Input Voltage, High Efficiency, 4A Integrated
FET Synchronous Step down DC/DC Regulator
POWER MANAGEMENT
Description
The SC4624A is a highly integrated synchronous step-
down DC/DC regulator designed for low input voltage
range of 2.3V to 5.5 Volts. It can deliver 4A continuous
output current with the output voltage as low as 0.5 Volts.
The internal low R_DS(ON) synchronous power switches
eliminate the need for external Schottky diode while
delivering overall converter efficiency up to 95%.
A power good pin is available to monitor the output voltage
status. Operating frequency is adjustable from 200 kHz
to 2MHz with a single resistor and it can be synchronized
to an external clock.
The SC4624A offers adjustable current limit, soft start and
over temperature protection to safeguard the device under
extreme operating conditions. The soft start provides a
controlled output voltage ramp up at startup. When a
logic low is applied to the Enable pin, the SC4624A enters
the shutdown mode and it consumes less than 1µA of
current.
The SC4624A is available in 4x4 MLPQ-20 and it is rated
over -40°C to +85°C ambient temperature range.
Features
u VIN Range: 2.3 – 5.5V
u 4A Continuous Output Current
u Adjustable Output Voltage 0.5V to Vin
u Low R_DS(ON) integrated FETs: 75mΩ and 47mΩ
u Up to 95% Efficiency
u Synchronizable and Programmable Frequency:
200kHz – 2MHz
u Power Good Monitor
u <1µA of Shutdown Current
u Programmable Soft Start
u Programmable Current Limit
u Over Temperature protection
u -40 to +85 °C Ambient Temperature Range
u 4X4mm MLPQ-20 packages- WEEE and RoHS
compliant
Applications
 Low Voltage Distributed DC-DC Converters
 Telecommunication Power Supplies
 Portable Equipment
 xDSL
Typical Application Circuit
5
4
3
2
1
D
Vin
C9
C
R5
R6
R2
C3
R4
C11
PVIN
PH
SYNC/EN
PGOOD
FB
VCC
SC4624A
D
L1
Vout
R7
C8
R8
C4
C
R1
R9
C1
C2
SS
B
ISET
B
FS
COMP
C7 C5 _{R3 R11}
A
5
Revision: July 10, 2008
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