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LM2746MXAX Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM2746MXAX
Description  Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller
PDF  24 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2746MXAX Datasheet(HTML) 4 Page - National Semiconductor (TI)

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Electrical Characteristics (Continued)
V
CC = 3.3V unless otherwise indicated. Limits in standard type are for TJ = 25˚C only; limits in boldface type apply over the
junction temperature (T
J) range of -40˚C to +125˚C. Minimum and Maximum limits are guaranteed through test, design, or sta-
tistical correlation. Typical values represent the most likely parametric norm at T
J = 25˚C, and are provided for reference pur-
poses only.
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 =5V @ 350mA Sourcing
3
Ω
R
HG_DN
High-Side MOSFET Driver
Pull-Down ON resistance
V
BOOT =5V @ 350mA Sinking
2
Ω
R
LG_UP
Low-Side MOSFET Driver
Pull-Up ON resistance
V
BOOT =5V @ 350mA Sourcing
3
Ω
R
LG_DN
Low-Side MOSFET Driver
Pull-Down ON resistance
V
BOOT =5V @ 350mA Sinking
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
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
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 human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin.
www.national.com
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