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SM8312 Datenblatt(PDF) 1 Page - SamHop Microelectronics Corp.

Teilenummer SM8312
Bauteilbeschribung  150KHz, 2A PWM Buck Switching Regulator
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Hersteller  SAMHOP [SamHop Microelectronics Corp.]
Direct Link  http://www.samhop.com.tw
Logo SAMHOP - SamHop Microelectronics Corp.

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SAMHOP Microelectronics Corp.
SM8312
150KHz, 2A PWM Buck Switching Regulator
1
V1.0 May 17 ,2007
General Description
The SM8312 is a monolithic integrated circuit that
provide all the active functions for a step-down
switching regulator, 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 SM8312
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
8-lead SOP8 package and a 5-lead TO-263(U).
Features
- 3.3V, 5V, 12V and adjustable output versions
- Adjustable version output voltage range, 1.23V to
37V +4% max over line and load condition
- 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: 2A
- 150KHz 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 )
TO263-5L
1 VIN
5 SD
4 FB
3 Gnd
2 Output
Metal Tab GND
SOP-8
1
3
2
VIN
FB
OUT
GND
GND
GND
8
6
7
GND
SD
4
5
Pin Descriptions
Name
Description
VIN
Operating voltage input
Output
Switching output
Gnd
Ground
FB
Output voltage feedback control
SD
ON/OFF Shutdown


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