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LM3743MMX-300 Datenblatt(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Teilenummer LM3743MMX-300
Bauteilbeschribung  N-Channel FET Synchronous Buck Controller for Low Output Voltages
Download  23 Pages
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Hersteller  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
V
CC
-0.3V to 6V
SW to GND
-0.3V to 6V
Boot to GND
-0.3V to 12V
Boot to SW
-0.3V to 6V
SS/TRACK, ILIM,
COMP/EN,FB to GND
-0.3V to V
CC
Junction Temperature
150˚C
Storage Temperature
−65˚C to 150˚C
Soldering Information
Lead Temperature (soldering, 10sec)
260˚C
Infrared or Convection (20sec)
235˚C
ESD Rating (Note 3)
+ / – 2 kV
Operating Ratings
Supply Voltage Range, V
CC (Note 2)
3.0V to 5.5V
Junction Temperature Range (T
J)
−40˚C to +125˚C
Electrical Characteristics V
CC = 3.3V, COMP/EN floating unless otherwise indicated in the conditions col-
umn. Limits in standard type are for T
J = 25˚C only; limits in boldface type apply over the junction temperature (TJ) range of
-40˚C to +125˚C. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values
represent the most likely parametric norm at T
J = 25˚C, and are provided for reference purposes only.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
SYSTEM PARAMETERS
V
FB
FB pin voltage in regulation
3.0V
≤ V
CC
≤ 5.5V
0.786
0.8
0.814
V
V
UVLO
UVLO thresholds
Input voltage rising
2.84
3.0
V
Input voltage falling
2.45
2.66
I
VCC
Operating V
CC current
f
SW = 300 kHz, LM3743-300
1.5
2.5
mA
Operating V
CC current
f
SW = 1 MHz, LM3743-1000
1.8
3.0
mA
Shutdown V
CC current
COMP/EN = 0V
6
50
µA
I
SS/TRACK
SS/TRACK pin source current
V
SS/TRACK =0V
8
10.2
12.5
µA
I
ILIM
ILIM pin source current
V
ILIM =0V
42.5
50
57.5
µA
V
ILIM
Current Limit Trip Level
–25
0
25
mV
I
COMP/EN
COMP/EN pin pull-up current
V
COMP/EN =0V
4
µA
V
HS-CLIM
High-side current limit threshold
Measured at V
CC pin with respect to
SW
500
mV
ERROR AMPLIFER
GBW
Error Amplifier Unity Gain Bandwidth
30
MHz
G
Error Amplifier DC Gain
90
dB
SR
Error Amplifier Slew Rate
6
V/ms
I
FB
FB pin Bias Current
10
200
nA
I
EAO
EAO pin sourcing/sinking current
capability
V
COMP/EN = 1.5, VFB = 0.75V
1.7
mA
V
COMP/EN = 1.5, VFB = 0.85V
-1
GATE DRIVE
I
SHDN-BOOT BOOT Pin Shutdown Current
V
BOOT-VSW = 3.3V, VCOMP/EN =0V
25
50
µA
R
HG-UP
High Side MOSFET Driver Pull-up ON
resistance
V
BOOT-VSW = 3.3V, IHGATE = 350mA
(sourcing)
1.6
R
HG-DN
High Side MOSFET Driver Pull-down ON
resistance
V
BOOT-VSW = 3.3V, IHGATE = 350mA
(sinking)
1
R
LG-UP
Low Side MOSFET Driver Pull-up ON
resistance
V
CC = 3.3V, ILGATE = 350mA
(sourcing)
1.6
R
LG-DN
Low Side MOSFET Driver Pull-down ON
resistance
V
CC = 3.3V, ILGATE = 350mA (sinking)
1
OSCILLATOR
f
SW
Oscillator Frequency
3.0V
≤ V
CC
≤ 5.5V, LM3743-300
255
300
345
kHz
3.0V
≤ V
CC
≤ 5.5V, LM3743-1000
850
1000
1150
D
MAX
Max Duty Cycle
f
SW = 300 kHz, LM3743-300
85
91
%
f
SW = 1 MHz, LM3743-1000
69
76
www.national.com
3


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