SM8313
150Khz, 3A PWM Buck Switching Regulator
General Description
The SM8313 series are monolithic integrated
circuits that provide all the active functions for a
step-down DC/DC converter, 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
SM8313 series operates at a switching frequency of
150Khz 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).
Features
-
3.3V, 5V, 12V and adjustable output versions
-
Adjustable version output voltage range, 1.23V to
28V +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 32V
-
Output load current: 3A
-
150 kHz 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
Description
Operating voltage input
Switching output
Ground
Output voltage feedback control
ON/OFF Shutdown
Metal Tab GND
TO263-5L
( Top View )
5 SD
4 FB
3 Gnd
2 Output
1 V
IN
TO220-5L
This
SD
this pr
product information. Kalai Techno ogy Corp. reserves the rights to modify the product specification without notice. No liab
o igh
any p
e of the product.
assumed as
result of
1/10
A AI
Rev. 1.0, Oct.10, 2005
TECHNOLOGY CORPORATION
SAMHOP [ SAMHOP MICROELECTRONICS CORP. ]
