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參數資料
| 型號： | L5970D |
| 廠商： | 意法半導體 |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關穩壓器 |
| 文件頁數： | 1/11頁 |
| 文件大?。?/td> | 135K |
| 代理商： | L5970D |
1/11
L5970AD
March 2005
1
■
1.5A INTERNAL SWITCH
■
OPERATING INPUT VOLTAGE FROM 4.4V TO 36V
■
3.3V / (
±
2%) REFERENCE VOLTAGE
■
OUTPUT VOLTAGE ADJUSTABLE FROM
1.235V TO 35V
■
LOW DROPOUT OPERATION: 100% DUTY
CYCLE
■
500KHz INTERNALLY FIXED FREQUENCY
■
VOLTAGE FEEDFORWARD
■
ZERO LOAD CURRENT OPERATION
■
INTERNAL CURRENT LIMITING
■
INHIBIT FOR ZERO CURRENT
CONSUMPTION
■
SYNCHRONIZATION
■
PROTECTION AGAINST FEEDBACK
DISCONNECTION
■
THERMAL SHUTDOWN
1.1 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
General Features
2
The L5970AD is a step down monolithic power
switching regulator with a switch current limit of 1.5A
so it is able to deliver more than 1A DC current to the
load depending on the application conditions.
The output voltage can be set from 1.235V to 35V.
The device uses an internal P-Channel D-MOS tran-
sistor (with a typical R
DSON
of 200m
) as switching
element to avoid the use of bootstrap capacitor and
guarantee high efficiency.
An internal oscillator fixes the switching frequency at
500KHz to minimize the size of external components.
Having a minimum input voltage of 4.4V only, it is
particularly suitable for 5V bus, available in all com-
puter related applications.
Pulse by pulse current limit with the internal frequen-
cy modulation offers an effective constant current
short circuit protection.
Description
1.5A SWITCH STEP DOWN SWITCHING REGULATOR
Figure 2. Test and Application Circuit
D05IN1530
8
4
5
1
7
L5970AD
C1
10
μ
F
35V
CERAMIC
C2
330
μ
F
10V
VOUT=3.3V
VIN = 4.4V to 35V
R1
5.6K
R2
3.3K
R3
4.7K
C4
22nF
C3
220pF
3
L1 15
μ
H
D1
STPS2L25U
COMP
VCC
OUT
FB
GND
INH
2
6
3.3V
SYNC.
VREF
Figure 1. Package
Table 1. Order Codes
Part Number
L5970AD
L5970ADTR
Package
SO-8
SO-8 in Tape & Reel
SO-8
Rev. 1
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相關代理商/技術參數 |
參數描述 |
|---|---|
| L5970D_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Up to 1A step down switching regulator |
| L5970D_0710 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Up to 1A step down switching regulator |
| L5970D013 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:UP TO 1A STEP DOWN SWITCHING REGULATOR |
| L5970D013TR | 功能描述:直流/直流開關調節器 1.2 to 35V Step-Down RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L5971 | 功能描述:直流/直流開關轉換器 1.26 to 20V Step-Dwn RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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