LTC4231
3
4321fa
For more information www.linear.com/LTC4231
orDer inForMaTion
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. IN = 12V, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IN
V
IN
Input Supply Voltage Range
l
2.7 36 V
V
IN(UVL)
Input Supply Undervoltage Lockout IN Rising
l
2 2.3 2.6 V
∆V
IN(HYST)
Input Supply Undervoltage Lockout
Hysteresis
200
mV
I
CC
Supply Current (Average)
Normal On, Voltage or Current Fault
Start-Up or Overcurrent
Shutdown
Reverse Input
(Note 5)
I
GATE
≤ –0.1µA, C
GATE-SOURCE
= 1nF, (C-Grade, I-Grade)
(H-Grade)
SHDN Low, GATE Pulled to GND, (C-Grade, I-Grade)
(H-Grade)
IN, SENSE = –40V
l
l
l
l
l
l
4
4
300
0.3
0.3
–2.5
10
20
600
1
2
–5
µA
µA
µA
µA
µA
mA
SENSE
∆V
SENSE(CB)
Circuit Breaker Threshold (V
IN
– V
SENSE
)
l
47 50 53 mV
∆V
SENSE(ACL)
Analog Current Limit During Output Short-Circuit
l
65 80 90 mV
I
SENSE
SENSE Input Current SHDN = High, SENSE = 12V
l
0.3 1 µA
GATE, SOURCE
∆V
GATE
External N-Channel Gate Drive
(V
GATE
– V
SOURCE
)
V
IN
< 7V, I
GATE
= 0, –0.1µA
V
IN
≥ 7V, I
GATE
= 0, –0.1µA
l
l
4.5
10
6.2
11.4
10
18
V
V
∆V
GATE(H)
∆V
GATE
(V
GATE
– V
SOURCE
) Threshold
That Deactivates the Charge Pump
V
IN
< 7V
V
IN
≥ 7V
l
l
5.5
11
6.5
11.7
10
18
V
V
V
GATE(L)
GATE Low Threshold To Enter Shutdown or Voltage Fault
l
0.4 1.2 1.8 V
I
GATE(UP)
GATE Pull-Up Current GATE On, GATE = 1V
l
–7 –10 –13 µA
I
GATE(FAST)
GATE Fast Pull-Down Current ∆V
SENSE
= 0.5V, ∆V
GATE
= 5V
l
70 130 mA
I
GATE(SLOW)
GATE Slow Pull-Down Current SHDN = 0V, ∆V
GATE
= 5V
l
0.6 1 mA
t
D(ON)
Turn-On Debounce Delay UVL = UVH = 2V, OV = 0V, SHDN = Step 0V to 5V
l
20 40 60 ms
t
RETRY
Auto-Retry Delay LTC4231-2
l
0.27 0.5 0.73 s
t
PHL(ILIM)
Overcurrent to GATE Low Propagation
Delay
∆V
SENSE
= Step 0mV to 300mV,
C
GATE
= 1nF, ∆V
GATE
Crosses 1V
l
0.5 1 µs
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4231CMS-1#PBF LTC4231CMS-1#TRPBF 42311 12-Lead Plastic MSOP 0°C to 70°C
LTC4231CMS-2#PBF LTC4231CMS-2#TRPBF 42312 12-Lead Plastic MSOP 0°C to 70°C
LTC4231IMS-1#PBF LTC4231IMS-1#TRPBF 42311 12-Lead Plastic MSOP –40°C to 85°C
LTC4231IMS-2#PBF LTC4231IMS-2#TRPBF 42312 12-Lead Plastic MSOP –40°C to 85°C
LTC4231HMS-1#PBF LTC4231HMS-1#TRPBF 42311 12-Lead Plastic MSOP –40°C to 125°C
LTC4231HMS-2#PBF LTC4231HMS-2#TRPBF 42312 12-Lead Plastic MSOP –40°C to 125°C
Consult LT C Marketing for parts specified with wider operating temperature ranges.
Consult LT C Marketing for information on nonstandard 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/
