SM8237 Datasheet, PDF (3/14 Pages) SamHop Microelectronics Corp. – 1.2MHz STEP-UP CONVERTER

SAMHOP Microelectronics Corp.
1.2MHz STEP-UP CONVERTER
APPLICATIONS
* Cellular phone
* PDAs, handheld computer
* Digital camera
* MP3 player
* GPS receiver
* DC to DC Converter
PIN ASSIGNMENTS (TOP VIEW)
SW 1
GND 2
FB 3
5 VIN
SW 1
GND 2
4 SHDN _{FB 3}
6 VIN
5 GND
4 SHDN
SOT-25
SOT-26
SW 1
GND 2
FB 3
5 VIN
4 SHDN
TSOT-25
(TSOT-23-5)
PIN DESCRIPTIONS
NO.
Pin name
1
SW
2
GND
3
FB
4
SHDN
5
GND (SOT-26)
6
VIN (SOT-26)
Function
Switch Pin. Connect inductor / diode here.
Minimize trace area at this pin to reduce EMI.
Ground Pin. Connect directly to local ground plane
Feedback Pin. Reference voltage is 95mV. Connect
cathode of lowest LED and resistor here. Calculate
resistor value according to the formula:
RFB =95mV/ILED
Shutdown Pin. Connect to 1.5V or higher to enable
device; 0.4V or less to disable device.
Ground Pin. Connect to Pin 2 and local ground
plane.
Input supply Pin. Must be locally bypassed.
MAXIMUM RATINGS
Characteristic
Input voltage (VIN)
SW voltage
FB voltage
SHDN voltage
Operating temperature range
Maximum junction temperature
Storage temperature range
Lead temperature (soldering, 10 sec)
Rating
Unit
10
V
36
V
10
V
10
V
- 40 ~ 85
o_C
125
V
- 65 ~ 150
V
300
V
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V.1.3 Aug 28,2007