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LM2744 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM2744
Description  Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller with External Reference
PDF  22 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2744 Datasheet(HTML) 4 Page - National Semiconductor (TI)

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Electrical Characteristics (Continued)
V
CC = 3.3V unless otherwise indicated. Typicals and limits appearing in plain type apply for TA=TJ= 25˚C. Limits appearing in
boldface type apply over full Operating Temperature Range. Datasheet min/max specification limits are guaranteed 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, VSD =0
18
90
µA
R
HG_UP
High-Side MOSFET Driver
Pull-Up ON resistance
V
BOOT -VSW = 9.5V@350mA
3
Ω
R
HG_DN
High-Side MOSFET Driver
Pull-Down ON resistance
V
BOOT -VSW = 4.5V@350mA
2
Ω
R
LG_UP
Low-Side MOSFET Driver
Pull-Up ON resistance
V
BOOT -VSW = 9.5V@350mA
3
Ω
R
LG_DN
Low-Side MOSFET Driver
Pull-Down ON resistance
V
BOOT -VSW = 4.5V@350mA
2
Ω
OSCILLATOR
F
SW
PWM Frequency
R
FADJ = 702.1 k
Ω
50
kHz
R
FADJ = 98.74 k
Ω
300
R
FADJ = 45.74 k
Ω
475
600
725
R
FADJ = 24.91 k
Ω
1000
D
Max High-Side Duty Cycle
F
SW = 300kHz
F
SW = 600kHz
F
SW = 1MHz
80
76
73
%
LOGIC INPUTS AND OUTPUTS
V
STBY-IH
Standby High Trip Point
V
FB = 0.575V, VBOOT = 3.3V,
V
SD Rising
1.1
V
V
STBY-IL
Standby Low Trip Point
V
FB = 0.575V, VBOOT = 3.3V,
V
SD Falling
0.232
V
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, V
REF = 0.5V
0.3262
0.347
0.3678
V
FB Falling, V
REF = 1.5V
0.993
1.045
1.097
V
V
PWGD-TH-HI
PWGD Pin Trip Points
FB Rising, V
REF = 0.5V
0.551
0.586
0.621
V
FB Rising, V
REF = 1.5V
1.6692
1.757
1.8448
V
V
PWGD-HYS
PWGD Hysteresis
FB Falling
FB Rising
60
90
mV
Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions for which the device
operates correctly. Opearting Ratings do not imply guaranteed performance limits.
Note 2: The power MOSFETs can run on a separate 1V to 16V rail (Input voltage, VIN). Practical lower limit of VIN depends on selection of the external MOSFET.
Note 3: The human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin.
www.national.com
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