參數(shù)資料
型號(hào)： L4972AD
廠商： STMICROELECTRONICS
元件分類(lèi)： 穩(wěn)壓器
英文描述： 3.5 A SWITCHING REGULATOR, 200 kHz SWITCHING FREQ-MAX, PDSO20
封裝： PLASTIC, SO-20
文件頁(yè)數(shù)： 12/22頁(yè)
文件大?。?/td> 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
相關(guān)PDF資料
PDF描述
L4972AD013TR 3.5 A SWITCHING REGULATOR, 200 kHz SWITCHING FREQ-MAX, PDSO20
L4973D3.3 5.5 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO20
L4973V3.3 5.5 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDIP18
L4990D013TR 1.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16
L4990 1.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDIP16
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L4972AD013TR 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 5.1 to 40V 2.0 Amp RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
L4972D 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Mode SMPS Controller
L4973 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.5A step down switching regulator
L4973D3 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.5A STEP DOWN SWITCHING REGULATOR
L4973D3.3 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 3.3V 3.5A Step-Down RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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