2
425112fd
LTC4251/LTC4251-1/
LTC4251-2
For more information www.linear.com/4251
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 LTC4251-2
T
JMAX
= 125°C, θ
JA
= 256°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
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4251CS6#PBF LTC4251CS6#TRPBF LTUQ 6-Lead Plastic SOT-23 0°C to 70°C
LTC4251IS6#PBF LTC4251IS6#TRPBF LTUR 6-Lead Plastic SOT-23 –40°C to 85°C
LTC4251-1CS6#PBF LTC4251-1CS6#TRPBF LTQU 6-Lead Plastic SOT-23 0°C to 70°C
LTC4251-1IS6#PBF LTC4251-1IS6#TRPBF LTQV 6-Lead Plastic SOT-23 –40°C to 85°C
LTC4251-2CS6#PBF LTC4251-2CS6#TRPBF LTK6 6-Lead Plastic SOT-23 0°C to 70°C
LTC4251-2IS6#PBF LTC4251-2IS6#TRPBF LTAAZ 6-Lead Plastic SOT-23 –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard 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/
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
LTC4251C/LTC4251-1C/LTC4251-2C ........ 0°C to 70°C
LTC4251I/LTC4251-1I/LTC4251-2I ........–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