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參數(shù)資料
| 型號： | LM3691TLX-3.3 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.7 A SWITCHING REGULATOR, 4400 kHz SWITCHING FREQ-MAX, PBGA6 |
| 封裝： | MICRO, SMD-6 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 1921K |
| 代理商： | LM3691TLX-3.3 |
30013498
FIGURE 5. Typical ECO Operation
FORCED PWM MODE
Setting Mode pin high (>1.2V) places the LM3691 in Forced
PWM. The part is in forced PWM regardless of the load.
SHUTDOWN MODE
Setting the EN input pin low (<0.4V) places the LM3691 in
shutdown mode. During shutdown the PFET switch, NFET
switch, reference, control and bias circuitry of the LM3691 are
turned off. Setting EN high (>1.2V) enables normal operation.
When turning on the device with EN soft-start is activated. EN
pin should be set low to turn off the LM3691 during system
power up and under-voltage conditions when the supply is
less than 2.3V. Do not leave the EN pin floating.
SOFT-START
The LM3691 has a soft-start circuit that limits in-rush current
during startup. Output voltage increase rate is 30 mV/sec (at
V
OUT = 1.8V typ.) during soft-start.
THERMAL SHUTDOWN PROTECTION
The LM3691 has a thermal overload protection function that
operates to protect itself from short-term misuse and overload
conditions. When the junction temperature exceeds around
150°C, the device inhibits operation. Both the PFET and the
NFET are turned off. When the temperature drops below 130°
C, normal operation resumes. Prolonged operation in thermal
overload conditions may damage the device and is consid-
ered bad practice.
OVER-TEMPERATURE MAXIMUM LOAD
RECOMMENDATIONS
VIN
Maximum Load
2.5V to 5.5V
1000 mA
2.3V to 2.5V
650 mA
15
www.national.com
LM3691
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