Datasheet
LTC4352
3
4352fa
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
SOURCE
= V
IN
, V
OUT
= V
IN
, V
CC
Open, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Supplies
V
IN
Input Operating Range
With External 2.9V to 4.7V V
CC
Supply
With External 4.7V to 6V V
CC
Supply
l
l
l
2.9
0
0
18
V
CC
18
V
V
V
V
CC(EXT)
V
CC
External Supply Range
l
2.9 6 V
V
CC(INT)
V
CC
Internal Regulator Voltage
l
3.5 4.1 4.7 V
I
IN
V
IN
Supply Current
V
IN
= 0V, V
CC
= 5V, V
OUT
= 18V
V
IN
= 0V, V
CC
= 5V, V
OUT
= 18V (LTC4352H)
l
l
l
1.4
–10
–10
3
–13
–25
mA
µA
µA
I
CC
External V
CC
Supply Current V
CC
= 5V, V
IN
= 0V
l
1.25 2.5 mA
V
CC(UVLO)
V
CC
Undervoltage Lockout Threshold V
CC
Rising
l
2.45 2.57 2.7 V
ΔV
CC(HYST)
V
CC
Undervoltage Lockout Hysteresis
l
50 70 90 mV
Ideal Diode Control
V
FWD(REG)
Forward Regulation Voltage (V
IN
− V
OUT
)
l
10 25 40 mV
ΔV
GATE
MOSFET Gate Drive (V
GATE
– V
SOURCE
) V
FWD
= 0.1V, I = 0 and –1μA
l
5 6.1 7.5 V
t
ON(GATE)
GATE Turn-On Delay C
GATE
= 10nF, V
FWD
= 0.2V
l
0.25 0.5 µs
t
OFF(GATE)
GATE Turn-Off Delay C
GATE
= 10nF, V
FWD
= −0.2V
l
0.2 0.5 µs
Input/Output Pins
V
UV,OV(TH)
UV, OV Threshold Voltage V
UV
Falling, V
OV
Rising
l
490 500 510 mV
ΔV
UV,OV(HYST)
UV, OV Threshold Hysteresis
l
2.5 5 8.5 mV
V
REV(TH)
REV Threshold Voltage
(LTC4352H)
l
l
0.8
0.8
1.0
1.0
1.2
1.25
V
V
I
UV,OV
UV, OV Current V = 0.5V
l
0 ±1 µA
I
REV
REV Current V
REV
= 1V
l
7 10 13 µA
I
OUT
OUT Current V
OUT
= 0V, 12V
l
–13 200 µA
I
SOURCE
SOURCE Current V
SOURCE
= 0V
l
–85 –130 µA
I
CPO(UP)
CPO Pull-Up Current V
CPO
= V
IN
= 2.9V
V
CPO
= V
IN
= 18V
l
l
–60
–50
–90
–75
–115
–100
µA
µA
I
GATE
GATE Fast Pull-Up Current
GATE Fast Pull-Down Current
GATE Off Pull-Down Current
V
FWD
= 0.2V, ΔV
GATE
= 0V, V
CPO
= 17V
V
FWD
= –0.2V, ΔV
GATE
= 5V
V
UV
= 0V, ΔV
GATE
= 2.5V
l
60
–1.5
1.5
100
145
A
A
µA
I
FLT,STAT(IN)
STATUS, FAULT Leakage Current V = 18V
l
0 ±1 µA
I
FLT,STAT(UP)
STATUS, FAULT Pull-Up Current V = 0V
l
–8 –10 –12 µA
V
OL
STATUS, FAULT Output Low Voltage I = 1.25mA
l
0.2 0.4 V
V
OH
STATUS, FAULT Output High Voltage I = –1μA
l
V
CC
– 1 V
CC
– 0.5 V
ΔV
GATE(ST)
MOSFET On Detect Threshold STATUS Pulls Low, V
FWD
= 50mV
STATUS Pulls Low, V
FWD
= 50mV (LTC4352H)
l
l
0.3
0.28
0.7
0.7
1.1
1.1
V
V
V
FWD(FLT)
Open MOSFET Threshold (V
IN
– V
OUT
) FAULT Pulls Low
l
200 250 300 mV
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating for extended periods may affect device reliability and
lifetime.
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to GND unless otherwise
specified.
Note 3: Internal clamps limit the GATE and CPO pins to a minimum of 5V
above, and a diode below SOURCE. Driving these pins to voltages beyond
the clamp may damage the device.