FAN4855 datasheet(2/12 Pages) FAIRCHILD | 500mA High Efficiency Boost Regulator with Adjustable Output, Shutdown and Low Battery Detect

2 page

www.fairchildsemi.com

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.

Name

Function

VIN

Battery Input Voltage. Supplies the IC during start-up. After the output is running, the IC draws

power from VOUT.

SHDN

Shut Down. Pulling this pin low shuts down the regulator, isolating the load from the input.

LBI

Low-Battery Input. Pulling this pin below 0.39V causes the LBO pin to go low.

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.

GND

Ground of the IC.

Parameter

Min.

Max.

Units

VIN, VOUT Voltages (Relative to GND)

-0.3

6.5

Switch Voltage (VL to GND)

-0.3

VOUT + 0.3

Voltage on any other Pin

-0.3

VOUT + 0.3

Peak Switch Current (Ipeak)

— Internally Limited —

Output Current (IOUT)

500

Continuous Power Dissipation

525

Thermal Resistance (

θJA)

124

°C/W

Junction Temperature

150

°C

Storage Temperature Range

-65

150

°C

Lead Temperature (soldering, 10s)

300

°C

VIN

GND

VOUT

TOP VIEW

8-Pin TSSOP

SHDN

LBI

LB0

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