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參數(shù)資料
| 型號(hào)： | LM2743 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | N-Channel FET Synchronous Buck Regulator Controller for Conversion from 3.3V |
| 中文描述： | N溝道場(chǎng)效應(yīng)管同步降壓穩(wěn)壓控制器，用于從3.3V轉(zhuǎn)換 |
| 文件頁(yè)數(shù)： | 4/23頁(yè) |
| 文件大小： | 653K |
| 代理商： | LM2743 |
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Electrical Characteristics
(Continued)
V
= 3.3V unless otherwise indicated. Typicals and limits appearing in plain type apply for T
= T
= +25C. 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
GATE DRIVE
I
Q-BOOT
R
DS1
Parameter
Conditions
Min
Typ
Max
Units
BOOT Pin Quiescent Current
Top FET Driver Pull-Up ON
resistance
Top FET Driver Pull-Down ON
resistance
Bottom FET Driver Pull-Up ON
resistance
Bottom FET Driver Pull-Down
ON resistance
BOOTV = 12V, EN = 0
18
90
μA
BOOT-SW = 5V
@
350mA
3
R
DS2
2
R
DS3
3
R
DS4
2
OSCILLATOR
F
OSC
PWM Frequency
R
FADJ
= 813.2k
R
FADJ
= 117.6k
R
FADJ
= 54.4k
R
FADJ
= 18.8k
R
FADJ
= 10.8k
f
PWM
= 300kHz
f
PWM
= 600kHz
50
300
600
1400
2000
90
85
kHz
475
725
D
Max Duty Cycle
%
LOGIC INPUTS AND OUTPUTS
V
STBY-IH
Standby High Trip Point
FB = 0.575V, BOOTV = 3.3V, EN =
0V to 3.3V
FB = 0.575V, BOOTV = 3.3V, EN =
3.3V to 0V
FB = 0.575V, BOOTV = 3.3V, EN =
0V to 3.3V
FB = 0.575V, BOOTV = 3.3V, EN =
3.3V to 0V
FB Voltage Going Down
FB Voltage Going Up
FB Voltage Going Down
FB Voltage Going Up
0.756
1.1
V
V
STBY-IL
Standby Low Trip Point
0.232
0.562
V
SD-IH
SD Pin Logic High Trip Point
1
1.3
V
V
SD-IL
SD Pin Logic Low Trip Point
0.8
1.1
V
V
PWGD-TH-LO
V
PWGD-TH-HI
V
PWGD-HYS
PWGD Pin Trip Points
PWGD Pin Trip Points
PWGD Hysteresis
0.408
0.677
0.434
0.710
60
90
0.457
0.742
V
V
mV
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
IN
). Low range of V
IN
greatly depends on selection of the external MOSFET.
Note 3:
The human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin.
Note 4:
Shutdown V
CC
current goes to zero amps after 20 seconds.
L
www.national.com
4
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| LM2743-19AEVAL | 功能描述:電源管理IC開(kāi)發(fā)工具 LM2743 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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| LM2743EVAL/NOPB | 功能描述:電源管理IC開(kāi)發(fā)工具 LM2743 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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