參數(shù)資料
型號(hào)： L5970D
廠商： STMICROELECTRONICS
元件分類(lèi)： 穩(wěn)壓器
英文描述： 2.25 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PDSO8
封裝： SOP-8
文件頁(yè)數(shù)： 1/16頁(yè)
文件大?。?/td> 274K
代理商： L5970D
October 2007
Rev 16
1/16
16
L5970D
Up to 1A step down switching regulator
Features
■ Up to 1A output current
■ Operating input voltage from 4.4V to 36V
■ 3.3V / (±2%) reference voltage
■ Output voltage adjustable from 1.2V to 35V
■ Low dropout operation: 100% duty cycle
■ 250KHz Internally fixed frequency
■ Voltage feedforward
■ Zero load current operation
■ Internal current limiting
■ Inhibit for zero current consumption
■ Synchronization
■ Protection against feedback disconnection
■ Thermal shutdown
Applications
■ Consumer: STB, DVD, TV, VCR, car radio,
LCD monitors
■ Networking: XDSL, modems, DC-DC modules
■ Computer: printers, audio/graphic cards,
optical storage, hard disk drive
■ Industrial: changers, car battery, DC-DC
converters
Figure 1.
Test application circuit
Description
The L5970D is a step down monolithic power
switching regulator capable to deliver up to 1A at
output voltages from 1.2V to 35V.
The device uses an internal P-Channel D-MOS
transistor (with a typical Rdson of 250m
) as
switching element to minimize the size of the
external components.
An internal oscillator fixes the switching frequency
at 250KHz.
Having a minimum input voltage of 4.4V only, it is
particularly suitable for 5V bus, available in all
computer related applications.
Pulse by pulse current limit with the internal
frequency modulation offers an effective constant
current short circuit protection.
SO8
D98IN954C
8
2
4
5
1
7
L5970D
C1
10
F
35V
CERAMIC
C2
100
F
10V
VOUT=3.3V
VIN = 4.4V to 35V
R1
5.6K
R2
3.3K
R3
4.7K
C4
22nF
C3
220pF
3
6
D1
STPS2L40U
3.3V
INH.
SYNC.
COMP
VCC
VREF
OUT
FB
GND
L1 33
H
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L5970D_07 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:Up to 1A step down switching regulator
L5970D_0710 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:Up to 1A step down switching regulator
L5970D013 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:UP TO 1A STEP DOWN SWITCHING REGULATOR
L5970D013TR 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 1.2 to 35V 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
L5971 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 1.26 to 20V Step-Dwn RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
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