SC4624_08 Datasheet, PDF (1/20 Pages) Semtech Corporation – Low Input Voltage, High Efficiency, 4A Integrated FET Synchronous Step down DC/DC Regulator

SC4624
Low Input Voltage, High Efficiency, 4A Integrated
FET Synchronous Step down DC/DC Regulator
POWER MANAGEMENT
Description
The SC4624 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 SC4624 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 SC4624 enters
the shutdown mode and it consumes less than 1.5µA of
current.
The SC4624 is available in 4x4 MLPQ-20 and SOIC-16EDP
package, and it is rated over -40°C to +105°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: 74mΩ and 47mΩ
u Up to 95% Efficiency
u Synchronizable and Programmable Frequency:
200kHz – 2MHz
u Power Good Monitor
u <1.5µA of Shutdown Current
u Programmable Soft Start
u Programmable Current Limit
u Over Temperature protection
u -40 to +105°C Ambient Temperature Range
u Starts into pre-biased output
u 4x4mm MLPQ-20 and SOIC-16EDP packages-
WEEE and RoHS Compliant
Applications
 Low Voltage Distributed DC-DC Converters
 Telecommunication Power Supplies
 Portable Equipment
 xDSL
Typical Application Circuit
Vin
R4
C11
R5
C9
R6
R2
PVIN
PH
SYNC/EN
PGOOD
FB
VCC
C3
SC4624
SS
ISET
FS
C7 C5 _{R3 R11}
COMP
L1
R7
R8
R1
R9
C1
C2
Vout
C8
C4
Revision: October 08, 2008

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