STEVAL-ISA139V1 Datasheet, PDF (1/4 Pages) STMicroelectronics – 380 mA maximum output current

STEVAL-ISA139V1
350 mA valley current limit adjustable step-down regulator based
on the PM6644
Data brief
Features
 4.5 V to 25 V input voltage range
 Fixed 3.43 V or adjustable 0.9 V to 5 V
 Reference accuracy = +-1%, Tj=0 °C to
85 °C
 380 mA maximum output current
 Constant on-time control with current sense
 Programmable switching frequency in PWM
mode
 Pulse skipping mode (skip mode) at light
loads
 Independent EN signal
 Latched OVP and UVP
 High accuracy 3.3 V reference voltage
Description
This product evaluation board is based on
STMicroelectronics' PM6644. The device
combines a 350 mA valley current limit step-down
regulator with a high accuracy 3.3 V voltage
reference in a small DFN10 3x3 package.
The switching regulator is based on a CoT
(constant on time) architecture that assures fast
load transient response. The embedded voltage
feed-forward provides nearly constant switching
frequency operation. Pulse-skipping is employed
to increase efficiency at very light load. The
switching frequency can be adjusted from 200
kHz to 600 kHz by means of a simple resistor.
The switching regulator can be programmed to
regulate a fixed value of 3.43 V or it can deliver
an adjustable voltage, depending on the FB pin
setup. The high precision integrated 3.3 V
reference can source up to 5 mA.
August 2014
DocID026819 Rev 1
For further information contact your local STMicroelectronics sales
office
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