2

Mar28-08

SP4446 High Output Voltage Boost Regulator, LCD Bias Regulator

© 2008 Exar Corporation

PIN DESCRIPTION

V

SW Voltage .............................................. -0.4 to 34V

FB Voltage .......................................................... 2.5V

All other pins .................................. -0.3 to V

Current into FB ................................................. ±1mA

T

Operating Temperature Range ............ -40°C to 85°C

Peak Output Current < 10us SW .................... 500mA

Storage Temperature ...................... -65°C to +150°C

Power Dissipation. ......................................... 200mW

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

CONDITIONS

Input voltage

1.0

8.0

V

Switch Current Limit =

150mA

Supply Current

20

30

µA

♦

No Switching

0.01

1

µA

SHDN = 0.0V

Reference Voltage

1.17

1.22

1.27

V

♦

FB Hysteresis

HYST

8

mV

15

80

nA

♦

Line Regulation

0.04

%/V

Switch Off Time

300

nS

1200

nS

Switch Saturation Voltage

50

mV

♦

150

mV

Switch Current Limit

100

150

200

mA

♦

SHDN Bias Current

5

12

µA

♦

SHDN High Threshold (on)

0.9

V

SHDN Low Threshold (off)

0.25

V

Switch Leakage Current

2

5

µA

♦

ELECTRICAL CHARACTERISTICS

temperature range, unless otherwise specified.

ABSOLUTE MAXIMUM RATINGS

Lead Temperature (Soldering, 10 sec) ............ 300°C

ESD Rating ................................................. 2kV HBM

These are stress ratings only and functional operation of

the device at these ratings or any other above those

indicated in the operation sections of the specifications

below is not implied. Exposure to absolute maximum

rating conditions for extended periods of time may affect

reliability.

PIN NUMBER

PIN NAME

DESCRIPTION

1

SW

Switch input to the internal power switch.

2

GND

Ground

3

FB

Feedback

4

SHDN

Shutdown. Pull high (on) to enable. Pull low (off) for shutdown.

5

Input Voltage. Bypass this pin with a capacitor as close to the device

as possible.