Datasheet
LTC4370
3
4370f
elecTrical characTerisTics
The l denotes those specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN1
= V
IN2
= 12V, OUT = V
IN
, V
CC
open, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Supplies
V
IN
V
IN1
, V
IN2
Operating Range
With External V
CC
Supply
l
l
2.9
0
18
V
CC
V
V
V
CC(EXT)
V
CC
External Supply Operating Range V
IN1
, V
IN2
≤ V
CC
l
2.9 6 V
V
CC(REG)
V
CC
Regulated Voltage
l
4.5 5 5.5 V
I
IN
V
IN1
, V
IN2
Current
Enabled, Higher Supply
Enabled, Lower Supply
Pull-Up
Disabled
Other V
IN
= 11.7V, Both EN = 0V
Other V
IN
= 12.3V, Both EN = 0V
Both V
IN
= 0V, V
CC
= 5V, Both EN = 0V
Both EN = 1V
l
l
l
l
2.1
320
–110
80
3
450
–180
180
mA
µA
µA
µA
I
CC
V
CC
Current
Enabled
Disabled
V
CC
= 5V, Both V
IN
= 1.2V, Both EN = 0V
V
CC
= 5V, Both V
IN
= 1.2V, Both EN = 1V
l
l
2
105
2.8
220
mA
µA
V
CC(UVLO)
V
CC
Undervoltage Lockout Threshold V
CC
Rising
l
2.3 2.55 2.7 V
ΔV
CC(HYST)
V
CC
Undervoltage Lockout Hysteresis
l
40 120 300 mV
Load Share
V
EA(OS)
Error Amplifier Input Offset
l
0 ±2 mV
g
m(EA)
Error Amplifier Gain (–ΔI
COMP
/ΔV
OUT
) 150 µS
V
FR(MIN)
Minimum Forward Regulation Voltage
(V
IN
– OUT)
V
IN
= 1.2V, V
CC
= 5V
V
IN
= 12V
l
l
2
2
12
25
25
50
mV
mV
V
FR(MAX)
Maximum Forward Regulation Voltage
(V
IN
– OUT)
R
RANGE
= 4.99k, V
IN
= 1.2V, V
CC
= 5V
R
RANGE
= 4.99k, V
IN
= 12V
R
RANGE
= 49.9k, V
IN
= 1.2V, V
CC
= 5V
R
RANGE
= 49.9k, V
IN
= 12V
l
l
l
l
40
45
425
440
62
75
511
524
82
100
575
590
mV
mV
mV
mV
I
RANGE
RANGE Pull-Up Current RANGE = 0.2V
l
–8.8 –10 –11.2 µA
V
RANGE(TH)
RANGE Load Share Disable Threshold
l
V
CC
– 0.5 V
CC
– 0.3 V
CC
– 0.1 V
Gate Drive
ΔV
GATE
MOSFET Gate Drive (GATE – V
IN
) V
FWD
= 0.2V; I = 0, −1μA; Highest V
IN
= 12V
V
FWD
= 0.2V; I = 0, −1μA; Highest V
IN
= 2.9V
l
l
10
4.5
12
7
14
9
V
V
t
ON(GATE)
GATE1, GATE2 Turn-On Propagation Delay
V
FWD
(= V
IN
– OUT) Step: –0.3V
0.3V
l
0.4 1 µs
t
OFF(GATE)
GATE1, GATE2 Turn-Off Propagation Delay
V
FWD
Step: 0.3V
–0.3V
l
0.4 1 µs
I
GATE(PK)
GATE1, GATE2 Peak Pull-Up Current
GATE1, GATE2 Peak Pull-Down Current
V
FWD
= 0.4V, ΔV
GATE
= 0V, CPO = 17V
V
FWD
= −2V, ΔV
GATE
= 5V
l
l
–0.9
0.9
–1.4
1.4
–1.9
1.9
A
A
I
GATE(OFF)
GATE1, GATE2 Off Pull-Down Current Corresponding EN = 1V, ΔV
GATE
= 2.5V
l
65 110 160 µA
Input/Output Pins
V
EN(TH)
EN1, EN2 Threshold Voltage EN Falling
l
580 600 620 mV
ΔV
EN(TH)
EN1, EN2 Threshold Hysteresis
l
2 8 20 mV
I
EN
EN1, EN2 Current At 0.6V
l
0 ±1 µA
I
OUT
OUT1, OUT2 Current
Enabled
Disabled
OUT
n
= 0V, 12V; Both EN = 0V
Both EN = 1V
l
l
–70
16
260
40
µA
µA
I
CPO(UP)
CPO1, CPO2 Pull-Up Current CPO = V
IN
l
–40 –70 –115 µA
V
OL
FETON1, FETON2 Output Low Voltage I = 1mA
I = 3mA
l
l
0.12
0.36
0.4
1.2
V
V
V
OH
FETON1, FETON2 Output High Voltage I = −1μA, V
FWD
= 1V
l
V
CC
– 1.4 V
CC
– 0.9 V
CC
– 0.5 V