380KHz, 2.5A STEP-DOWN SWITCHING REGULATOR
DESCRIPTION
The UTC P1583 is a fixed 380kHz frequency, current mode, PWM
controller. It achieves 2.5A continuous output current over a wide input
supply range with excellent load and line regulation. Equipped with an
external compensation pin, this device offers user flexibility in determining
loop dynamic.
The UTC P1583 integrates controls, monitoring and protection functions
into a single 8-pin package to provide a low cost and perfect power
solution. The device provides wide 4 to 24V operating input range, also
highly efficient with peak operating efficiency at 90%.
An Under-Voltage-Lock-Output (UVLO) circuit monitors the Vin supply
voltage to prevent wrong logic controls. An internal 1.222V reference
provides low output voltage down to 1.22V for further applications. An
internal soft-start prevents the output voltage from overshoot as well as
limiting the input current. The controller’s over-current protection monitors
the output current by using the voltage drop across a current sensing
resistor. Additional under voltage protections monitor the voltage on FB pin
for short-circuit protections.
The UTC P1583 provides fast transient respond and requires very few
external devices for operation.
FEATURES
* 2.5A output current
* 380kHz frequency of operation
* 4V to 24V input voltage range
* 25μA shutdown supply current
* Output adjustable from 1.22 to 21V
* Frequency foldback at short circuit
* Thermal shutdown
* Under voltage lock output
* Current mode with low ESR output ceramic capacitors
* Up to 90% efficiency |
