SC4626 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC4626' PDF : 21 Pages View PDF
POWER MANAGEMENT
Features
VIN Range: 2.9 – 5.5V
VOUT Options: 1.0 - 3.3V
Up to 1A Output Current
2.5MHz Switching Frequency
Efficiency Up to 93%
Low Output Noise Across Load Range
Excellent Transient Response
Start Up into Pre-Bias Output
100% Duty-Cycle Low Dropout Operation
<1µA Shutdown Current
Internal Soft Start
Input Under-Voltage Lockout
Output Over-Voltage, Current Limit Protection
Over-Temperature Protection
Adjustable Output Voltage
SOT23-5 Package
Fully WEEE and RoHS Compliant
Applications
Bluetooth Radios
DSC and PMPs
GPS Devices
xDSL Systems
POL Regulators
Portable HDD
Wireless LAN
SC4626
2.5MHz, 1A Synchronous Step
Down Regulator in SOT23-5
Description
The SC4626 is a high efficiency, synchronous step-down
regulator providing up to 1A output current in a SOT23-
5 package. The device requires only three external filter
components for a complete step-down regulator solution.
The input voltage range is 2.9 to 5.5V with either factory
programmed outputs from 1.0 to 3.3V or adjustable
output via an external resistor divider.
The converter operates at fixed 2.5MHz switching
frequency allowing small L/C filtering components.
The voltage mode architecture is compatible with chip
inductors and capacitors for minimum PCB footprint and
lowest overall system cost.
Up to 93% efficiency is achieved with low RDS(ON) internal
switches. PWM constant frequency operation ensures
low output ripple across the load range. 100% duty-cycle
provides 300mV dropout voltage at 1A which extends
the minimum input voltage for 2.5V and 3.3V outputs.
Excellent transient response is achieved with no external
compensation components.
The SC4626 provides input under-voltage, output over-
voltage, output short circuit and over-temperature
protection to safeguard the device and system under fault
conditions. The regulator provides integrated soft-start to
minimize inrush currents. Standby quiescient current is
less than 1µA.
The SC4626 is available in a SOT23-5 package.
Typical Application Circuit
VIN
2.9V to 5.5V
CIN
10µF
Enable
August 27, 2010
VIN
LX
L
2.2µH
GND
EN VOUT
SC4626C
COUT
10µF
VOUT
1.20V/1A
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