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LM2748MTC View Datasheet(PDF) - National ->Texas Instruments

Part NameLM2748MTC National-Semiconductor
National ->Texas Instruments National-Semiconductor
DescriptionSynchronous Buck Controller with Pre-bias Startup, and Optional Clock Synchronization
LM2748MTC Datasheet PDF : 23 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
Electrical Characteristics (Continued)
VCC = 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
IQ-BOOT
RHG_UP
BOOT Pin Quiescent Current
High-Side MOSFET Driver
Pull-Up ON resistance
VBOOT = 12V, VSD = 0
VBOOT = 5V @ 350 mA Sourcing
18
90
µA
2.7
RHG_DN
High-Side MOSFET Driver
Pull-Down ON resistance
350 mA Sinking
0.8
RLG_UP
Low-Side MOSFET Driver Pull-Up
ON resistance
VBOOT = 5V @ 350 mA Sourcing
2.7
RLG_DN
Low-Side MOSFET Driver
Pull-Down ON resistance
350 mA Sinking
0.8
OSCILLATOR
RFADJ = 750 k
PWM Frequency
fSW
RFADJ = 100 k
RFADJ = 42.2 k
RFADJ = 18.7 k
LM2745 External Synchronizing
Signal Frequency
Voltage Swing = 0V to VCC
50
300
475
600
725
kHz
1000
250
1000
SYNCL
LM2745 Synchronization Signal
Low Threshold
fSW = 250 kHz to 1 MHz
1
V
LM2745 Synchronization Signal
SYNCH
High Threshold
fSW = 250 kHz to 1 MHz
2
V
DMAX
Max High-Side Duty Cycle
LOGIC INPUTS AND OUTPUTS
fSW = 300 kHz
fSW = 600 kHz
fSW = 1 MHz
86
78
%
67
VSTBY-IH
Standby High Trip Point
VSTBY-IL
Standby Low Trip Point
VSD-IH
VSD-IL
VPWGD-TH-LO
VPWGD-TH-HI
VPWGD-HYS
SD Pin Logic High Trip Point
SD Pin Logic Low Trip Point
PWGD Pin Trip Points
PWGD Pin Trip Points
PWGD Hysteresis
VFB = 0.575V, VBOOT = 3.3V
VSD Rising
VFB = 0.575V, VBOOT = 3.3V
VSD Falling
VSD Rising
VSD Falling
VFB Falling
VFB Rising
VFB Falling
VFB Rising
1.1
V
0.232
V
1.3
V
0.8
V
0.408 0.434 0.457
V
0.677 0.710 0.742
V
60
mV
90
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. Operating Ratings do not imply guaranteed performance limits.
Note 2: The power MOSFETs can run on a separate 1V to 14V rail (Input voltage, VIN). Practical lower limit of VIN depends on selection of the external MOSFET.
See the MOSFET GATE DRIVERS section under Application Information for further details.
Note 3: ESD using the human body model which is a 100pF capacitor discharged through a 1.5 kresistor into each pin.
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