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参数资料
| 型号： | LM2742 |
| 厂商： | National Semiconductor Corporation |
| 英文描述： | N-Channel FET Synchronous Buck Regulator Controller for Low Output Voltages |
| 中文描述： | N沟道场效应管同步降压稳压控制器输出电压低 |
| 文件页数： | 17/22页 |
| 文件大小： | 619K |
| 代理商： | LM2742 |
Electrical Characteristics (Continued)
V
CC = 5V unless otherwise indicated. Typicals and limits appearing in plain type apply for TA=TJ=+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
Parameter
Conditions
Min
Typ
Max
Units
GATE DRIVE
I
Q-BOOT
BOOT Pin Quiescent Current
BOOT = 12V, EN = 0
0C to +125C
-40C to +125C
95
160
215
A
R
DS1
Top FET Driver Pull-Up ON
resistance
BOOT-SW = 5V@350mA
3
R
DS2
Top FET Driver Pull-Down ON
resistance
BOOT-SW = 5V@350mA
2
R
DS3
Bottom FET Driver Pull-Up ON
resistance
BOOT-SW = 5V@350mA
3
R
DS4
Bottom FET Driver Pull-Down
ON resistance
BOOT-SW = 5V@350mA
2
OSCILLATOR
f
OSC
PWM Frequency
R
FADJ = 590k
50
kHz
R
FADJ = 88.7k
300
R
FADJ = 42.2k
, 0C to +125C
500
600
700
R
FADJ = 42.2k
, -40C to +125C
490
600
700
R
FADJ = 17.4k
1400
R
FADJ = 11.3k
2000
D
Max Duty Cycle
f
PWM = 300kHz
f
PWM = 600kHz
90
88
%
t
on-min
Minimum on-time
40
ns
LOGIC INPUTS AND OUTPUTS
V
SD-IH
SD Pin Logic High Trip Point
2.6
3.5
V
SD-IL
SD Pin Logic Low Trip Point
0C to +125C
-40C to +125C
1.3
1.25
1.6
V
PWGD-TH-LO
PWGD Pin Trip Points
FB Voltage Going Down
0C to +125C
-40C to +125C
0.413
0.410
0.430
0.446
V
PWGD-TH-HI
PWGD Pin Trip Points
FB Voltage Going Up
0C to +125C
-40C to +125C
0.691
0.688
0.710
0.734
V
PWGD-HYS
PWGD Hysteresis
FB Voltage Going Down FB Voltage
Going Up
35
110
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 human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin.
Note 3: The LG and HG pin can have -2V to -0.5V applied for a maximum duty cycle of 10% with a maximum period of 1 second. There is no duty cycle or maximum
period limitation for a LG and HG pin voltage range of -0.5V to 21V.
LM2742
www.national.com
4
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