lm2744mtcx National Semiconductor Corporation, lm2744mtcx Datasheet - Page 4

• Manufacturer Part Number: lm2744mtcx
• Description: Low Voltage N-channel Mosfet Synchronous Buck Regulator Controller With External Reference
• Manufacturer: National Semiconductor Corporation

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GATE DRIVE
OSCILLATOR
LOGIC INPUTS AND OUTPUTS
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, V
Note 3: The human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin.
V
V
V
PWGD-TH-LO
V
V
PWGD-TH-HI
Symbol
PWGD-HYS
I
R
R
R
R
V
V
Q-BOOT
STBY-IH
HG_UP
HG_DN
F
STBY-IL
LG_UP
LG_DN
SD-IH
SD-IL
D
SW
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
Standby High Trip Point
Standby Low Trip Point
SD Pin Logic High Trip Point
SD Pin Logic Low Trip Point
PWGD Pin Trip Points
PWGD Pin Trip Points
PWGD Hysteresis
Parameter
V
V
V
V
V
R
R
R
R
F
F
F
V
Rising
V
Falling
V
V
FB Falling, V
FB Falling, V
FB Rising, V
FB Rising, V
FB Falling
FB Rising
BOOT
BOOT
BOOT
BOOT
BOOT
SW
SW
SW
FB
FB
SD
SD
FADJ
FADJ
FADJ
FADJ
= 0.575V, V
= 0.575V, V
Rising
Falling
= 300kHz
= 600kHz
= 1MHz
= 702.1 kΩ
= 98.74 kΩ
= 45.74 kΩ
= 24.91 kΩ
= 12V, V
- V
- V
- V
- V
SW
SW
SW
SW
Conditions
4
REF
REF
= 9.5V@350mA
= 4.5V@350mA
= 9.5V@350mA
= 4.5V@350mA
REF
REF
SD
IN
BOOT
BOOT
= 0.5V
= 1.5V
= 0.5V
= 1.5V
). Practical lower limit of V
= 0
= 3.3V, V
= 3.3V, V
SD
SD
IN
0.3262
1.6692
0.232
0.993
0.551
depends on selection of the external MOSFET.
Min
475
0.8
0.347
1.045
0.586
1.757
1000
Typ
300
600
18
50
80
76
73
60
90
3
2
3
2
0.3678
1.8448
1.097
0.621
Max
725
1.1
1.3
90
Units
kHz
mV
µA
Ω
Ω
Ω
Ω
%
V
V
V
V
V
V
V
V