Datasheet

LT3751
3
3751fc
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are T
A
= 25°C. V
CC
= CHARGE = 5V, CLAMP = 0V, unless otherwise noted. Individual
25kΩ resistors tied from 5V V
TRANS
supply to RV
TRANS
, RV
OUT
, RDCM, unless otherwise noted. (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Voltage
l
4.75 24 V
RV
TRANS
Voltage (Note 3)
l
4.75 65 V
V
CC
Quiescent Current Not Switching, CHARGE = 5V
Not Switching, CHARGE = 0.3V
5.5
0
8
1
mA
µA
RV
TRANS
, R
DCM
Quiescent Current (Note 4)
Not Switching, CHARGE = 5V
Not Switching, CHARGE = 0.3V
l
35 40
0
45
1
µA
µA
RV
OUT
Quiescent Current (Note 4)
Not Switching, CHARGE = 5V
Not Switching, CHARGE = 0.3V
l
42 47
0
52
1
µA
µA
UVLO1, UVLO2, OVLO1, OVLO2 Clamp Voltage Measured at 1mA into Pin, CHARGE = 0V 55 V
RV
TRANS
, RV
OUT
, R
DCM
Clamp Voltage Measured at 1mA into Pin, CHARGE = 0V 60 V
CHARGE Pin Current CHARGE = 24V
CHARGE = 5V
CHARGE = 0V
425
60
1
µA
µA
µA
CHARGE Minimum Enable Voltage
l
1.5 V
CHARGE Maximum Disable Voltage I
VCC
≤ 1µA
l
0.3 V
Minimum CHARGE Pin Low Time 20 μs
One-Shot Clock Period
l
32 38 44 μs
V
OUT
Comparator Trip Voltage Measured at RBG Pin
l
0.955 0.98 1.005 V
V
OUT
Comparator Overdrive 2µs Pulse Width,
RV
TRANS
, RV
OUT
= 25kΩ
R
BG
= 0.83kΩ
20 40 mV
DCM Comparator Trip Voltage Measured as V
DRAIN
– V
TRANS
, R
DCM
= 25kΩ, V
CC
= 4.75V
(Note 5)
350 600 900 mV
Current Limit Comparator Trip Voltage FB Pin = 0V
FB Pin = 1.3V
l
l
100
7
106
11
112
15
mV
mV
FB Pin Bias Current Current Sour
ced from FB Pin, Measured at FB Pin Voltage 64 300 nA
FB Pin Voltage (Note 6)
l
1.19 1.22 1.25 V
FB Pin Charge Mode Threshold 1.12 1.16 1.2 V
FB Pin Charge Mode Hysteresis (Note 7) 55 mV
FB Pin Overvoltage Mode Threshold 1.29 1.34 1.38 V
FB Pin Overvoltage Hysteresis 60 mV
DONE Output Signal High 100kΩ to 5V 5 V
DONE Output Signal Low 100kΩ to 5V 40 200 mV
DONE Leakage Current DONE = 5V 5 200 nA
FAULT Output Signal High 100kΩ to 5V 5 V
FAULT Output Signal Low 100kΩ to 5V 40 200 mV
FAULT Leakage Current FAULT = 5V 5 200 nA
UVLO1 Pin Current UVLO1 Pin Voltage = 1.24V
l
48.5 50 51.5 μA
UVLO2 Pin Current UVLO2 Pin Voltage = 1.24V
l
48.5 50 51.5 μA
OVLO1 Pin Current OVLO1 Pin Voltage = 1.24V
l
48.5 50 51.5 μA
OVLO2 Pin Current OVLO2 Pin Voltage = 1.24V
l
48.5 50 51.5 μA