Datasheet

LM2743
SNVS276G –APRIL 2004–REVISED MARCH 2013 www.ti.com
Electrical Characteristics
(1)
(continued)
V
CC
= 3.3V unless otherwise indicated. Typicals and limits appearing in plain type apply for T
A
= T
J
= 25°C. Limits appearing in
boldface type apply over full Operating Temperature Range. Datasheet min/max specification limits are specified by design,
test, or statistical analysis.
Symbol Parameter Conditions Min Typ Max Units
GATE DRIVE
I
Q-BOOT
BOOT Pin Quiescent Current V
BOOT
= 12V, V
SD
= 0 18 90 µA
R
HG_UP
High-Side MOSFET Driver Pull-Up
V
BOOT
= 5V @ 350mA Sourcing 3 Ω
ON resistance
R
HG_DN
High-Side MOSFET Driver Pull-
HG = 5V @ 350mA Sourcing 2 Ω
Down ON resistance
R
LG_UP
Low-Side MOSFET Driver Pull-Up
V
BOOT
= 5V @ 350mA Sourcing 3 Ω
ON resistance
R
LG_DN
Low-Side MOSFET Driver Pull-
LG = 5V @ 350mA Sourcing 2 Ω
Down ON resistance
OSCILLATOR
R
FADJ
= 702.1 kΩ 50
R
FADJ
= 98.74 kΩ 300
f
SW
PWM Frequency kHz
R
FADJ
= 45.74 kΩ 475 600 725
R
FADJ
= 24.91 kΩ 1000
D Max High-Side Duty Cycle f
SW
= 300kHz 80 %
f
SW
= 600kHz 76
f
SW
= 1MHz 73
LOGIC INPUTS AND OUTPUTS
V
STBY-IH
Standby High Trip Point V
FB
= 0.575V, V
BOOT
= 3.3V, V
SD
1.1
V
Rising
V
STBY-IL
Standby Low Trip Point V
FB
= 0.575V, V
BOOT
= 3.3V, V
SD
0.232
V
Falling
V
SD-IH
SD Pin Logic High Trip Point V
SD
Rising 1.3 V
V
SD-IL
SD Pin Logic Low Trip Point V
SD
Falling 0.8 V
V
PWGD-TH-LO
PWGD Pin Trip Points FB Falling 0.408 0.434 0.457 V
V
PWGD-TH-HI
PWGD Pin Trip Points FB Rising 0.677 0.710 0.742 V
V
PWGD-HYS
PWGD Hysteresis FB Falling 60
mV
FB Rising 90
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