SAMHOP Microelectronics Corp.
1.2MHz STEP-UP CONVERTER
PIN ASSIGNMENTS (TOP VIEW)
APPLICATIONS
* Cellular phone
* PDAs, handheld computer
* Digital camera
1
2
3
5
4
VIN
SW
GND
FB
SW
GND
FB
1
2
3
6
5
4
VIN
1
2
3
5
4
VIN
SW
GND
FB
GND
SHDN
* MP3 player
SHDN
* GPS receiver
SHDN
* DC to DC Converter
SOT-25
SOT-26
TSOT-25
(TSOT-23-5)
PIN DESCRIPTIONS
NO.
Pin name
Function
Switch Pin. Connect inductor / diode here.
Minimize trace area at this pin to reduce EMI.
1
SW
2
GND
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
3
FB
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.
4
5
6
SHDN
GND (SOT-26)
VIN (SOT-26)
Input supply Pin. Must be locally bypassed.
MAXIMUM RATINGS
Characteristic
Rating
10
Unit
V
Input voltage (VIN)
SW voltage
36
V
FB voltage
10
V
SHDN voltage
10
V
oC
V
Operating temperature range
Maximum junction temperature
Storage temperature range
Lead temperature (soldering, 10 sec)
- 40 ~ 85
125
- 65 ~ 150
300
V
V
Page 2
V.1.3 Aug 28,2007
SAMHOP [ SAMHOP MICROELECTRONICS CORP. ]
