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參數(shù)資料
| 型號： | L4976D |
| 廠商： | 意法半導體 |
| 英文描述： | 1A STEP DOWN SWITCHING REGULATOR |
| 中文描述： | 第1A降壓開關穩(wěn)壓器 |
| 文件頁數(shù)： | 1/11頁 |
| 文件大小： | 100K |
| 代理商： | L4976D |
UP TO 1A STEP DOWN CONVERTER
OPERATING INPUT VOLTAGE FROM 8V TO
55V
PRECISE5.1V REFERENCE VOLTAGE
OUTPUT VOLTAGE ADJUSTABLE FROM
3.3VTO 50V
SWITCHING FREQUENCY ADJUSTABLE UP
TO 500KHz
VOLTAGEFEEDFORWARD
ZEROLOAD CURRENT OPERATION
INTERNAL CURRENT LIMITING (PULSE-BY-
PULSEAND HICCUPMODE)
PROTECTION AGAINST FEEDBACK DIS-
CONNECTION
THERMAL SHUTDOWN
DESCRIPTION
The L4976 is a step down monolithic power
switching regulator delivering 1A at a voltage be-
tween 3.3V and 50V (selected by a simple exter-
nal divider). Realized in BCD mixed technology,
the device uses an internal power D-MOS transis-
tor (with a typical Rdson of 0.25
) to obtain very
high efficency and high switchingspeed.
A switching frequency up to 250KHz is achiev-
able (the maximum power dissipationof the pack-
ages must be observed).
A wide input voltage range between 8V to 55V
and output voltages regulated from 3.3V to 40V
cover the majority of today’sapplications.
Features of this new generations of DC-DC con-
verter include pulse-by-pulse current limit, hiccup
mode for short circuit protection, voltage feedfor-
ward regulation, protection against feedbackloop
disconnectionand thermalshutdown.
The device is available in plastic dual in line,
MINIDIP 8 for standard assembly, and SO16W
for SMD assembly.
May 2000
ORDERING NUMBERS:
L4976 (Minidip)
L4976D (SO16)
L4976
1A STEP DOWN SWITCHING REGULATOR
Minidip
SO16W
5
2
8
4
1
L4976
C
1
220
μ
F
63V
C
8
330
μ
F
V
O
=3.3V/1A
Vi=8V to 55V
R
1
20K
C
2.7nF
R
9.1K
C
22nF
3
7
L1
260
μ
H
(77120)
6
D1
GI
SB360
C
220nF
C
100nF
TYPICAL APPLICATION CIRCUIT
1/11
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| L4976D013TR | 功能描述:直流/直流開關調(diào)節(jié)器 3.3 to 50V 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(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L4977 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Mode SMPS Controller |
| L4977A | 功能描述:直流/直流開關調(diào)節(jié)器 5.1 to 40V 7.0 Amp 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(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L4977HT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Mode SMPS Controller |
| L4978 | 功能描述:直流/直流開關調(diào)節(jié)器 3.3 to 50V 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(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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