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参数资料
| 型号： | L4972AD |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 3.5 A SWITCHING REGULATOR, 200 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | PLASTIC, SO-20 |
| 文件页数： | 12/22页 |
| 文件大小： | 1370K |
| 代理商： | L4972AD |
L4972A
2/22
Table 2. Pin Description
Figure 3. Pin Connection (Top view)
N°
Pin
Function
1
BOOTSTRAP
A Cboot capacitor connected between this terminal and the output allows to drive
properly the internal D-MOS transistor.
2
RESET DELAY
A Cd capacitor connected between this terminal and ground determines the reset
signal delay time.
3
RESET OUT
Open Collector Reset/power Failand the output voltages are safe. Signal Output.
This output is high when the supply
4
RESET INPUT
Input of Power Fail Circuit. The threshold is 5.1V. It may be connected via a divider
to the input for power fail function. It must be connected to the pin 14 an external
30K
resistor when power fail signal not required.
5, 6 15,
16
GROUND
Common Ground Terminal
7
FREQUENCY
COMPENSATION
A series RC network connected between this terminal and ground determines the
regulation loop gain characteristics.
8
SOFT START
Soft Start Time Constant. A capacitor is connected between the sterminal and
ground to define the soft start time constant.
9
FEEDBACK INPUT
The Feedback Terminal of the Regulation Loop. The output is connected directly to
this terminal for 5.1V operation; It is connected via a divider for higher voltages.
10
SYNC INPUT
Multiple L4972A’s are synchronized by connecting pin 10 inputs together or via an
external syncr. pulse.
11
SUPPLY VOLTAGE
Unregulated Input Voltage.
12, 19
N.C.
Not Connected.
13
Vref
5.1V Vref Device Reference Voltage.
14
Vstart
Internal Start-up Circuit to Drive the Power Stage.
17
OSCILLATOR
Rosc. External resistor connected to ground determines the constant charging
current of Cosc.
18
OSCILLATOR
Cosc. External capacitor connected to ground determines (with Rosc) the switching
frequency.
20
OUTPUT
Regulator Output.
1
3
2
4
5
6
7
8
9
20
19
18
17
16
14
15
13
12
DIP20
10
11
GND
FREQ. COMP.
SOFT START
SYNC INPUT
FEEDBACK IN.
N.C.
Vi
Vref
Vstart
GND
BOOTSTRAP
RESET DELAY
RESET OUT
P. FAIL INPUT
GND
R OSC
C OSC
N.C.
OUTPUT
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| L4972AD013TR | 功能描述:直流/直流开关调节器 5.1 to 40V 2.0 Amp RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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| L4973 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.5A step down switching regulator |
| L4973D3 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.5A STEP DOWN SWITCHING REGULATOR |
| L4973D3.3 | 功能描述:直流/直流开关调节器 3.3V 3.5A Step-Down RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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