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LT3743 Datasheet(PDF) 3 Page - Linear Technology

Part # LT3743
Description  High Current Synchronous Step-Down LED Driver with Three-State Control
PDF  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3743 Datasheet(HTML) 3 Page - Linear Technology

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LT3743
3
3743f
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VEN/UVLO = 5V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Voltage Range
(Note 2)
6
36
V
VIN Pin Quiescent Current (Note 3)
Non-Switching Operation
Shutdown Mode
VPWM = VCTRL_SEL = 0V, Not Switching
VEN/UVLO = 0V
l
1.8
0.1
2.5
1
mA
μA
EN/UVLO Pin Falling Threshold
1.49
1.55
1.61
V
EN/UVLO Hysteresis
130
mV
EN/UVLO Pin Current
VIN = 6V, EN/UVLO = 1.45V
5.5
μA
PWM Pin Threshold
1.0
V
CTRL_SEL Threshold
1.0
V
SYNC Pin Threshold
1.0
V
CTRL_H and CTRL_L Pin Control Range
0
1.5
V
CTRL_H and CTRL_L Pin Current
100
nA
Reference
Reference Voltage (VREF Pin)
With a 67kΩ Resistor from VREF to GND
l
1.96
2
2.04
V
Inductor Current Sensing
Full Range SENSE+ to SENSE–
VCTRL_H or VCTRL_L = 1.5V
l
48
51
54
mV
SENSE+ Pin Current
50
nA
SENSE– Pin Current
With VOUT ~ 4V
10
μA
Internal VCC Regulator (VCC_INT Pin)
Regulation Voltage
l
4.7
5
5.2
V
NMOS FET Driver (Note 2)
Non-Overlap time HG to LG
100
ns
Non-Overlap time LG to HG
60
ns
Minimum On-Time LG
(Note 4)
50
ns
Minimum On-Time HG
(Note 4)
200
ns
Minimum Off-Time LG
(Note 4)
60
ns
High Side Driver Switch On-Resistance
Gate Pull Up
Gate Pull Down
VCBOOT – VSW = 5V
2.3
1.3
Ω
Ω
Low Side Driver Switch On-Resistance
Gate Pull Up
Gate Pull Down
VCC_INT = 5V
2.5
1.3
Ω
Ω
Switching Frequency
fSW
RT = 40kΩ
RT = 200kΩ
l
930
200
1000
218
1070
233
kHz
kHz
Soft-Start
Charging Current
5.5
μA
Voltage Regulation Amplifier
Input Bias Current
1nA
gm
200
μA/V
Feedback Regulation Voltage
l
0.945
0.99
1.025
V



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