參數(shù)資料
型號(hào)： LM3743MMX-300
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： N-Channel FET Synchronous Buck Controller for Low Output Voltages
中文描述： SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO10
封裝： PLASTIC, MSOP-10
文件頁數(shù)： 3/23頁
文件大?。?/td> 1145K
代理商： LM3743MMX-300
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
SW to GND
Boot to GND
Boot to SW
SS/TRACK, ILIM,
COMP/EN,FB to GND
Junction Temperature
Storage Temperature
-0.3V to 6V
-0.3V to 6V
-0.3V to 12V
-0.3V to 6V
-0.3V to V
CC
150C
65C to 150C
Soldering Information
Lead Temperature (soldering, 10sec)
Infrared or Convection (20sec)
ESD Rating (Note 3)
260C
235C
+ / – 2 kV
Operating Ratings
Supply Voltage Range, V
CC
(Note 2)
Junction Temperature Range (T
J
)
3.0V to 5.5V
40C to +125C
Electrical Characteristics
umn. Limits in standard type are for T
= 25C only; limits in boldface type apply over the junction temperature (T
) range of
-40C to +125C. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values
represent the most likely parametric norm at T
J
= 25C, and are provided for reference purposes only.
V
CC
= 3.3V, COMP/EN floating unless otherwise indicated in the conditions col-
Symbol
SYSTEM PARAMETERS
V
FB
FB pin voltage in regulation
V
UVLO
UVLO thresholds
Parameter
Conditions
Min
Typ
Max
Units
3.0V
≤
V
CC
≤
5.5V
Input voltage rising
Input voltage falling
f
SW
= 300 kHz, LM3743-300
f
SW
= 1 MHz, LM3743-1000
COMP/EN = 0V
V
SS/TRACK
= 0V
V
ILIM
= 0V
0.786
0.8
2.84
2.66
1.5
1.8
6
10.2
50
0
4
500
0.814
3.0
V
V
2.45
I
VCC
Operating V
CC
current
Operating V
CC
current
Shutdown V
CC
current
SS/TRACK pin source current
ILIM pin source current
Current Limit Trip Level
COMP/EN pin pull-up current
High-side current limit threshold
2.5
3.0
50
12.5
57.5
25
mA
mA
μA
μA
μA
mV
μA
mV
I
SS/TRACK
I
ILIM
V
ILIM
I
COMP/EN
V
HS-CLIM
8
42.5
–25
V
COMP/EN
= 0V
Measured at V
CC
pin with respect to
SW
ERROR AMPLIFER
GBW
G
SR
I
FB
I
EAO
Error Amplifier Unity Gain Bandwidth
Error Amplifier DC Gain
Error Amplifier Slew Rate
FB pin Bias Current
EAO pin sourcing/sinking current
capability
30
90
6
10
1.7
-1
MHz
dB
V/ms
nA
200
V
COMP/EN
= 1.5, V
FB
= 0.75V
V
COMP/EN
= 1.5, V
FB
= 0.85V
mA
GATE DRIVE
I
SHDN-BOOT
BOOT Pin Shutdown Current
R
HG-UP
High Side MOSFET Driver Pull-up ON
resistance
R
HG-DN
High Side MOSFET Driver Pull-down ON
resistance
R
LG-UP
Low Side MOSFET Driver Pull-up ON
resistance
R
LG-DN
Low Side MOSFET Driver Pull-down ON
resistance
OSCILLATOR
f
SW
Oscillator Frequency
V
BOOT
-V
SW
= 3.3V, V
COMP/EN
= 0V
V
BOOT
-V
SW
= 3.3V, I
HGATE
= 350mA
(sourcing)
V
BOOT
-V
SW
= 3.3V, I
HGATE
= 350mA
(sinking)
V
CC
= 3.3V, I
LGATE
= 350mA
(sourcing)
V
CC
= 3.3V, I
LGATE
= 350mA (sinking)
25
1.6
50
μA
1
1.6
1
3.0V
≤
V
CC
≤
5.5V, LM3743-300
3.0V
≤
V
CC
≤
5.5V, LM3743-1000
f
SW
= 300 kHz, LM3743-300
f
SW
= 1 MHz, LM3743-1000
255
850
85
69
300
1000
91
76
345
1150
kHz
D
MAX
Max Duty Cycle
%
L
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