125Khz, 2A PWM Buck Switching
The KP1503A is a monolithic integrated circuit that
provide all the active functions for a step-down
switching regulator with an additional operational
amplifier to precisely control ON/OFF function,
capable of driving a 2A load without additional
transistor component. Requiring a minimum
number of external component, the board space
can be saved easily. The external shutdown
function can be controlled by TTL logic level and
then come into standby mode. The internal
compensation makes feedback control have good
line and load regulation without external design.
Regarding protected function, thermal shutdown is
to prevent over temperature operating from damage,
and current limit is against over current operating of
the output switch. The KP1503A operates at a
switching frequency of 125Khz thus allowing
smaller sized filter components than what would be
needed with lower frequency switching regulators.
Other features include a guaranteed +4% tolerance
on output voltage under specified input voltage and
output load conditions, and +15% on the oscillator
frequency. The output version included fixed 3.3V,
5V, 12V, and an adjustable type. The packages are
available in a standard 8-lead SOP8.
- 3.3V, 5V, 12V and adjustable output versions
- Adjustable version output voltage range, 1.23V to
37V +4% max over line and load condiction
- SOP-8L packages
- Voltage mode non-synchronous PWM control
- Thermal-shutdown and current-limit protection
- ON/OFF shutdown control input
- Input voltage range up to 40V
- Output load current: 2A
- 125 kHz fixed frequency internal oscillator
- Low power standby mode
- Built-in switching transistor on chip
- Simple High-efficiency step-down(buck) regulator
- Efficient preregulator for linear regulators
- On-card switching regulators
- Positive to negative converter
- Battery Charger
VIN Operating voltage input.
Out Switching output.
FB Output voltage feedback control.
SD ON /OFF , Low:Active ; High:Shutdown
OPO Operational Amplifier Output.
OP- Operational Amplifier Negative Input
OP+ Operational Amplifier Positive Input
EXPOSED Pad for heatsinking purposes.Connect
PAD to groung plane using multiple vias.
This datasheet contains new product information. Kalai Technology Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of
the use of this product. No rights under any patent accompany the sale of the product.
Rev. 1.0 MAR.08, 2005
KALAI TECHNOLOGY CORPORATION