SAMHOP Microelectronics Corp.
52KHz, 3A PWM Buck Switching Regulator
General Description
The SM8313F is a monolithic integrated circuit that
provide all the active functions for a step-down
switching regulator, capable of driving a 3A 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
SM8313F operates at a switching frequency of
52Khz 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 5-lead TO-220(T) package and a 5-lead
TO-263(S).
SM8313F
Features
-
3.3V, 5V, 12V and adjustable output versions
-
Adjustable version output voltage range, 1.23V to
37V +4% max over line and load condiction
-
Available in TO220-5L and TO263-5L 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: 3A
-
52kHz fixed frequency internal oscillator
-
Low power standby mode
-
Built-in switching transistor on chip
Applications
-
Simple High-efficiency step-down(buck) regulator
-
Efficient preregulator for linear regulators
-
On-card switching regulators
-
Positive to negative converter
- Battery Charger
Pin Assignments
( Top View )
5 SD
4 FB
3 Gnd
2 Output
1 V
IN
Pin Descriptions
Name
V
IN
Output
Gnd
FB
5 SD
4 FB
3 Gnd
2 Output
1 V
IN
Description
Operating voltage input
Switching output
Ground
Output voltage feedback control
ON/OFF Shutdown
Metal Tab GND
TO263-5L
( Top View )
SD
TO220-5L
1
V1.0 May 17 ,2007
SAMHOP [ SAMHOP MICROELECTRONICS CORP. ]
