Step-Down Converter. SP1410 Datasheet
PWM Control 2A Step-Down Converter
The SP1410 is a monolithic step down
switch mode regulator with a built in internal
Power MOSFET. It achieves 2A continuous
output current over a wide input supply range with
excellent load and line regulation.
Current mode operation provides fast
transient response and eases loop stabilization.
Fault condition protection includes
cycle-by-cycle current limiting and thermal
shutdown. In shutdown mode the regulator draws
25μA of supply current.
The SP1410 requires a minimum number of
readily available standard external components.
2A Output Current.
0.22Ω Internal Power MOSFET Switch,
Stable with Low ESR Output Ceramic
Up to 95% Efficiency.
25μA Shutdown Mode
Cycle-by-cycle over current protection
Wide 4.75 to 25V operating input range
Output Adjustable from 1.22 to 21V
Programmable under voltage lockout
Standard SOP8 Packages
Distributed Power Systems
Pre-Regulator for Linear Regulators
Operating Ambient Temperature
-20 to +85 °C
Symbol Pin NO.
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side n-channel
MOSFET switch.Connect a 10nF or greater capacitor from SW to BS to power the
Power Input. IN supplies the power to the IC, as well as the step-down converter
switches. Drive IN with a 4.75V to 25V power source. Bypass IN to GND with a
suitably large capacitor to eliminate noise on the input to the IC. See Input
Power Switching Output. SW is the switching node that supplies power to the output.
Connect the output LC filter from SW to the output load. Note that a capacitor is
required from SW to BS to power the high-side switch.
Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with
a resistive voltage divider from the output voltage. The feedback threshold is 1.22V.
See Setting the Output Voltage.
Compensation Node. COMP is used to compensate the regulation control loop.
Connect a series RC network from COMP to GND to compensate the regulation
control loop. See Compensation.
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to
turn on the regulator, drive it low to turn it off. For automatic startup, leave EN