lm2746mxax National Semiconductor Corporation, lm2746mxax Datasheet - Page 4

• Manufacturer Part Number: lm2746mxax
• Description: Low Voltage N-channel Mosfet Synchronous Buck Regulator Controller
• Manufacturer: National Semiconductor Corporation

www.national.com
GATE DRIVE
OSCILLATOR
LOGIC INPUTS AND OUTPUTS
Electrical Characteristics
V
junction temperature (T
tistical correlation. Typical values represent the most likely parametric norm at T
poses only.
V
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.
V
V
CC
PWGD-TH-LO
PWGD-TH-HI
Symbol
PWGD-HYS
R
R
I
R
R
V
V
Q-BOOT
HG_DN
HG_UP
LG_DN
LG_UP
= 3.3V unless otherwise indicated. Limits in standard type are for T
f
SD-IH
SW
SD-IL
D
BOOT Pin Quiescent Current
High-Side MOSFET Driver
Pull-Up ON resistance
High-Side MOSFET Driver
Pull-Down ON resistance
Low-Side MOSFET Driver
Pull-Up ON resistance
Low-Side MOSFET Driver
Pull-Down ON resistance
PWM Frequency
Max High-Side Duty Cycle
SD Pin Logic High Trip Point
SD Pin Logic Low Trip Point
PWGD Pin Trip Points
PWGD Pin Trip Points
PWGD Hysteresis
J
) range of -40˚C to +125˚C. Minimum and Maximum limits are guaranteed through test, design, or sta-
Parameter
(Continued)
V
V
V
V
V
R
R
R
R
f
f
f
V
V
FB Falling
FB Rising
FB Falling
FB Rising
SW
SW
SW
BOOT
BOOT
BOOT
BOOT
BOOT
SD
SD
FADJ
FADJ
FADJ
FADJ
= 300kHz
= 600kHz
= 1MHz
Rising
Falling
= 702.1 kΩ
= 98.74 kΩ
= 45.74 kΩ
= 24.91 kΩ
= 12V, V
= 5V
= 5V
= 5V
= 5V
Conditions
4
@
@
@
@
350mA Sourcing
350mA Sinking
350mA Sourcing
350mA Sinking
SD
= 0
J
= 25˚C only; limits in boldface type apply over the
J
= 25˚C, and are provided for reference pur-
0.408
0.677
Min
475
0.8
0.434
0.710
1000
Typ
300
600
18
50
80
76
73
60
90
3
2
3
2
0.457
0.742
Max
725
1.3
90
Units
kHz
mV
µA
%
Ω
Ω
Ω
Ω
V
V
V
V