LTC1921 datasheet(2/24 Pages) LINER

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4251b12f

LTC4251B/LTC4251B-1/

LTC4251B-2

PIN CONFIGURATION

ABSOLUTE MAXIMUM RATINGS

SENSE 1

VEE 2

VIN 3

6 GATE

5 UV/OV*

4 TIMER

TOP VIEW

S6 PACKAGE

6-LEAD PLASTIC SOT-23

*UV FOR LTC4251B-2

TJMAX = 125°C, θJA = 192°C/W

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN to VEE Zener Voltage

IIN = 2mA

11.5

14.5

VIN to VEE Zener Dynamic Impedance

IIN = 2mA to 30mA

IIN

VIN Supply Current

UV/OV = 4V, VIN = (VZ – 0.3V)

0.8

VLKO

VIN Undervoltage Lockout

Coming Out of UVLO (Rising VIN)

9.2

11.5

VLKH

VIN Undervoltage Lockout Hysteresis

VCB

Circuit Breaker Current Limit Voltage

VCB = (VSENSE – VEE)

VACL

Analog Current Limit Voltage

VACL = (VSENSE – VEE)

100

120

VFCL

Fast Current Limit Voltage

VFCL = (VSENSE – VEE)

150

200

300

IGATE

GATE Pin Output Current

UV/OV = 4V, VSENSE = VEE, VGATE = 0V (Sourcing)

UV/OV = 4V, VSENSE – VEE = 0.15V, VGATE = 3V (Sinking)

UV/OV = 4V, VSENSE – VEE = 0.3V, VGATE = 1V (Sinking)

190

μA

VGATE

External MOSFET Gate Drive

VGATE – VEE, IIN = 2mA

The

l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. (Notes 2, 3)

ORDER INFORMATION

Current into VIN (100μs Pulse) .............................100mA

Minimum VIN Voltage............................................ – 0.3V

Gate, UV/OV, Timer Voltage........................ –0.3V to 16V

Sense Voltage ............................................ –0.6V to 16V

Current Out of Sense Pin (20μs Pulse).............. –200mA

Maximum Junction Temperature .......................... 125°C

Operating Temperature Range

LTC4251BC/LTC4251BC-1/LTC4251BC-2....0°C to 70°C

LTC4251BI/LTC4251BI-1/LTC4251BI-2 .. –40°C to 85°C

Storage Temperature Range .................. –65°C to 150°C

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

(Note 1), All Voltages are Referred to VEE

Lead Free Finish

TAPE AND REEL (MINI)

TAPE AND REEL

PART MARKING*

PACKAGE DESCRIPTION

TEMPERATURE RANGE

LTC4251BCS6#TRMPBF

LTC4251BCS6#TRPBF

LTGCT

6-Lead Plastic SOT-23

0°C to 70°C

LTC4251BIS6#TRMPBF

LTC4251BIS6#TRPBF

LTGCT

6-Lead Plastic SOT-23

–40°C to 85°C

LTC4251BCS6-1#TRMPBF

LTC4251BCS6-1#TRPBF

LTGDV

6-Lead Plastic SOT-23

0°C to 70°C

LTC4251BIS6-1#TRMPBF

LTC4251BIS6-1#TRPBF

LTGDV

6-Lead Plastic SOT-23

–40°C to 85°C

LTC4251BCS6-2#TRMPBF

LTC4251BCS6-2#TRPBF

LTGDW

6-Lead Plastic SOT-23

0°C to 70°C

LTC4251BIS6-2#TRMPBF

LTC4251BIS6-2#TRPBF

LTGDW

6-Lead Plastic SOT-23

–40°C to 85°C

TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container.

Consult LTC Marketing for parts specified with wider operating temperature ranges.

Consult LTC Marketing for information on lead based finish parts.

For more information on lead free part marking, go to: http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/

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