LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
ELECTRICAL CHARACTERISTICS
SYMBOL
V
Z
r
Z
I
IN
V
LKO
V
LKH
V
CB
V
ACL
V
ACL
/
V
CB
V
FCL
V
SS
R
SS
I
SS
PARAMETER
V
IN
– V
EE
Zener Voltage
V
IN
– V
EE
Zener Dynamic Impedance
V
IN
Supply Current
V
IN
Undervoltage Lockout
V
IN
Undervoltage Lockout Hysteresis
Circuit Breaker Current Limit Voltage
Analog Current Limit Voltage
Analog Current Limit Voltage/
Circuit Breaker Voltage
Fast Current Limit Voltage
SS Voltage
SS Output Impedance
SS Pin Current
UV = OV = 4V, V
SENSE
= V
EE
,
V
SS
= 0V (Sourcing)
UV = OV = 0V, V
SENSE
= V
EE
,
V
SS
= 2V (Sinking)
V
OS
Analog Current Limit Offset Voltage
V
ACL
+V
OS
/ Ratio (V
ACL
+ V
OS
) to SS Voltage
V
SS
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)
V
GATE
V
GATEH
V
GATEL
V
UVHI
V
UVLO
V
UV
V
UVHST
V
OVHI
V
OVLO
V
OV
V
OVHST
I
SENSE
I
INP
V
TMRH
V
TMRL
External MOSFET Gate Drive
Gate High Threshold
Gate Low Threshold
UV Pin Threshold HIGH
UV Pin Threshold LOW
UV Pin Threshold
UV Pin Hysteresis
OV Pin Threshold HIGH
OV Pin Threshold LOW
OV Pin Threshold
OV Pin Hysteresis
SENSE Pin Input Current
UV, OV Pin Input Current
TIMER Pin Voltage High Threshold
TIMER Pin Voltage Low Threshold
Low-to-High Transition
(
●
for LTC4252A Only)
UV = OV = 4V, V
SENSE
= 50mV
UV = OV = 4V
Low-to-High Transition
(
●
for LTC4252A Only)
V
GATE
– V
EE
, I
IN
= 2mA
V
GATEH
= V
IN
– V
GATE
, I
IN
= 2mA,
for
PWRGD
Status (MS Only)
(Before Gate Ramp-Up)
●
3.075
●
2.775
●
●
●
●
●
●
●
●
●
●
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2)
CONDITIONS
I
IN
= 2mA
I
IN
= 2mA to 30mA
UV = OV = 4V, V
IN
= (V
Z
– 0.3V)
Coming Out of UVLO (Rising V
IN
)
V
CB
= (V
SENSE
– V
EE
)
V
ACL
= (V
SENSE
– V
EE
),
SS = Open or 2.2V
V
ACL
= (V
SENSE
– V
EE
),
SS = Open or 1.4V
V
FCL
= (V
SENSE
– V
EE
)
After End of SS Timing Cycle
●
●
l
LTC4252-1/-2
MIN
TYP MAX
11.5
13
5
0.8
9.2
1
●
●
●
●
LTC4252A-1/-2
MIN
TYP MAX
11.5
13
5
0.9
9
0.5
45
50
14.5
2
10
55
UNITS
V
Ω
mA
V
V
mV
mV
14.5
2
11.5
60
120
40
80
50
100
1.05
150
200
2.2
100
22
28
10
0.05
40
58
17
190
10
12
2.8
0.5
3.225 3.375
2.925 3.075
3.05
300
5.85
5.25
6.15
5.55
600
–15
± 0.1
4
1
–30
±1
6.45
5.85
5.04
82
292
V
Z
10
80
40
300
150
1.20
200
1.4
50
28
28
10
0.05
58
17
190
12
2.8
0.5
1.38
300
V/V
mV
V
kΩ
μA
mA
mV
V/V
80
μA
mA
mA
V
Z
V
V
V
V
V
3.08
324
3.11
356
V
mV
V
V
5.09
102
–15
± 0.1
4
1
5.14
122
–30
±1
V
mV
μA
μA
V
V
425212fd
3
LINER [ LINEAR TECHNOLOGY ]
