2
4251b12f
LTC4251B/LTC4251B-1/
LTC4251B-2
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
SENSE 1
V
EE
2
V
IN
3
6 GATE
5 UV/OV*
4 TIMER
TOP VIEW
S6 PACKAGE
6-LEAD PLASTIC SOT-23
*UV FOR LTC4251B-2
T
JMAX
= 125°C, θ
JA
= 192°C/W
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
Z
V
IN
to V
EE
Zener Voltage I
IN
= 2mA
l
11.5 13 14.5 V
r
Z
V
IN
to V
EE
Zener Dynamic Impedance I
IN
= 2mA to 30mA 5 Ω
I
IN
V
IN
Supply Current UV/OV = 4V, V
IN
= (V
Z
– 0.3V)
l
0.8 2 mA
V
LKO
V
IN
Undervoltage Lockout Coming Out of UVLO (Rising V
IN
)
l
9.2 11.5 V
V
LKH
V
IN
Undervoltage Lockout Hysteresis 1 V
V
CB
Circuit Breaker Current Limit Voltage V
CB
= (V
SENSE
– V
EE
)
l
40 50 60 mV
V
ACL
Analog Current Limit Voltage V
ACL
= (V
SENSE
– V
EE
)
l
80 100 120 mV
V
FCL
Fast Current Limit Voltage V
FCL
= (V
SENSE
– V
EE
)
l
150 200 300 mV
I
GATE
GATE Pin Output Current UV/OV = 4V, V
SENSE
= V
EE
, V
GATE
= 0V (Sourcing)
UV/OV = 4V, V
SENSE
– V
EE
= 0.15V, V
GATE
= 3V (Sinking)
UV/OV = 4V, V
SENSE
– V
EE
= 0.3V, V
GATE
= 1V (Sinking)
l
40 58
17
190
80 μA
mA
mA
V
GATE
External MOSFET Gate Drive V
GATE
– V
EE
, I
IN
= 2mA
l
10 12 V
Z
V
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Notes 2, 3)
ORDER INFORMATION
Current into V
IN
(100μs Pulse) .............................100mA
Minimum V
IN
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 V
EE
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/
