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参数资料
| 型号： | LM22674QMRX-ADJ/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 3/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.5A 8PSOP |
| 标准包装： | 2,500 |
| 系列： | SIMPLE SWITCHER® |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 1.285V |
| 输入电压： | 4.5 V ~ 42 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 500mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-PSOP |
Operating Ratings (1)
Supply Voltage (V IN )
Junction Temperature Range
SNVS590L – SEPTEMBER 2008 – REVISED APRIL 2013
4.5V to 42V
-40°C to +125°C
(1)
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur, including inoperability and degradation of
device reliability and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or
other conditions beyond those indicated in the recommended Operating Ratings is not implied. The recommended Operating Ratings
indicate conditions at which the device is functional and should not be operated beyond such conditions.
Electrical Characteristics
Limits in standard type are for T J = 25°C only; limits in boldface type apply over the junction temperature (T J ) 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 A = T J = 25°C, and are provided for reference purposes only. Unless otherwise
specified: V IN = 12V.
Symbol
Parameter
Conditions
Min (1)
Typ (2)
Max (1)
Units
LM22674-5.0
V FB
Feedback Voltage
V IN = 8V to 42V
4.925/ 4.9
5.0
5.075/ 5.1
V
LM22674-ADJ
V FB
Feedback Voltage
V IN = 4.7V to 42V
1.266/ 1.259
1.285
1.304/ 1.311
V
All Output Voltage Versions
I Q
I STDBY
I CL
I L
R DS(ON)
f O
T OFFMIN
T ONMIN
I BIAS
Quiescent Current
Standby Quiescent Current
Current Limit
Output Leakage Current
Switch On-Resistance
Oscillator Frequency
Minimum Off-time
Minimum On-time
Feedback Bias Current
V FB = 5V
EN Pin = 0V
V IN = 42V, EN Pin = 0V, V SW = 0V
V SW = -1V
V FB = 1.3V (ADJ Version Only)
0.56/ 0.62
400
100
3.4
25
0.7
0.2
0.1
0.2
500
200
100
230
6
40
0.84/ 0.9
2
3
0.24/ 0.32
600
300
mA
μA
A
μA
μA
?
kHz
ns
ns
nA
V EN
Enable Threshold Voltage
Falling
1.3
1.6
1.9
V
V ENHYST
Enable Voltage Hysteresis
0.6
V
I EN
T SD
θ JA
Enable Input Current
Thermal Shutdown Threshold
Thermal Resistance
EN Input = 0V
MR package, Junction to ambient
thermal resistance (3)
6
150
60
μA
°C
°C/W
(1)
(2)
(3)
Min and Max limits are 100% production tested at 25°C. Limits over the operating temperature range are guaranteed through correlation
using Statistical Quality Control (SQC) methods. Limits are used to calculate TI's Average Outgoing Quality Level (AOQL).
Typical values represent most likely parametric norms at the conditions specified and are not guaranteed.
The value of θ JA for the SO PowerPAD exposed pad (MR) package of 60°C/W is valid if package is mounted to 1 square inch of copper.
The θ JA value can range from 42 to 115°C/W depending on the amount of PCB copper dedicated to heat transfer.
Copyright ? 2008–2013, Texas Instruments Incorporated
Product Folder Links: LM22674
3
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