參數(shù)資料
型號(hào)： L5973AD
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 2.3 A SWITCHING REGULATOR, PDSO8
封裝： EXPOSED PAD, HSOP-8
文件頁數(shù)： 1/22頁
文件大?。?/td> 486K
代理商： L5973AD
November 2009
Doc ID 9552 Rev 9
1/22
22
L5973AD
2 A switch step down switching regulator
Features
■ 2 A internal switch
■ Operating input voltage from 4 V to 36 V
■ 3.3 V / (±2%) reference voltage
■ Output voltage adjustable from 1.235 V to 35 V
■ Low dropout operation: 100% duty cycle
■ 500 kHz 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: chargers, car battery, DC-DC
converters
Description
The L5973AD is a step down monolithic power
switching regulator with a switch current limit of
2 A so it is able to deliver more than 1.5 A DC
current to the load depending on the application
conditions.
The output voltage can be set from 1.235 V
to 35 V. The high current level is also achieved
thanks to an SO8 package with exposed frame,
that allows to reduce the RthJA down to
approximately 40 °C/W.
The device uses an internal P-Channel D-MOS
transistor (with a typical of 200 m
Ω) as switching
element to avoid the use of bootstrap capacitor
and guarantee high efficiency.
An internal oscillator fixes the switching frequency
at 500 kHz to minimize the size of external
components.
Having a minimum input voltage of 4 V only, it is
particularly suitable for 5 V 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.
HSOP8 exposed pad
Figure 1.
Test application circuit
D03IN1453
8
4
5
1
7
L5973AD
C1
10
μF
35V
CERAMIC
C2
330
μF
10V
VOUT=3.3V
VIN = 4V to 35V
R1
5.6K
R2
3.3K
R3
4.7K
C4
22nF
C3
220pF
3
L1 15
μH
D1
STPS340U
COMP
VCC
OUT
FB
GND
INH
2
6
3.3V
SYNC.
VREF
相關(guān)PDF資料
PDF描述
L5973D 3.5 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PDSO8
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L5973AD_07 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2A switch step down switching regulator
L5973AD_08 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2 A switch step down switching regulator
L5973ADTR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.235 to 35V Step-Dn RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(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
L5973D 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1.235 to 35V Step-Dn RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
L5973D_08 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2.5 A switch step down switching regulator?癎
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