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FAN4855 Datasheet(PDF) 2 Page - Fairchild Semiconductor

Part No. FAN4855
Description  500mA High Efficiency Boost Regulator with Adjustable Output, Shutdown and Low Battery Detect
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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FAN4855 Datasheet(HTML) 2 Page - Fairchild Semiconductor

 
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FAN4855 Rev. 1.0.1
Pin Configuration
Pin Description
Absolute Maximum Ratings
Absolute Maximum Ratings are those values, beyond which the device could be permanently damaged. Absolute max-
imum ratings are stress ratings only and functional device operation is not implied.
Pin
Name
Function
1
VIN
Battery Input Voltage. Supplies the IC during start-up. After the output is running, the IC draws
power from VOUT.
2
SHDN
Shut Down. Pulling this pin low shuts down the regulator, isolating the load from the input.
3
LBI
Low-Battery Input. Pulling this pin below 0.39V causes the LBO pin to go low.
4
LBO
Low-Battery Output. This pin provides an active low signal to alert the user when the LBI voltage
falls below its targeted value. The open-drain output can be used to reset a microcontroller.
5FB
Feedback Input. For setting the output voltage. Connect this pin to the resistor divider.
6VOUT
Boost regulator output. Output voltage can be set to be in the 3 to 5V range. Startup at moderate
load is achievable at input voltages around 1.35V.
7VL
Boost inductor connection. Connect an inductor between this pin and VIN. When servicing the
output supply, this pin pulls low, charging the inductor, then shuts off dumping the energy through
the synchronous rectifier to the output.
8
GND
Ground of the IC.
Parameter
Min.
Max.
Units
VIN, VOUT Voltages (Relative to GND)
-0.3
6.5
V
Switch Voltage (VL to GND)
-0.3
VOUT + 0.3
V
Voltage on any other Pin
-0.3
VOUT + 0.3
V
Peak Switch Current (Ipeak)
— Internally Limited —
Output Current (IOUT)
500
mA
Continuous Power Dissipation
525
mW
Thermal Resistance (
θJA)
124
°C/W
Junction Temperature
150
°C
Storage Temperature Range
-65
150
°C
Lead Temperature (soldering, 10s)
300
°C
VIN
GND
VL
VOUT
FB
1
2
3
4
8
7
TOP VIEW
8-Pin TSSOP
6
5
SHDN
LBI
LB0


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