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參數(shù)資料
| 型號： | L4976 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 1A Step Down Switching Regulator(步降開關(guān)穩(wěn)壓器) |
| 中文描述： | 第1A降壓開關(guān)穩(wěn)壓器（步降開關(guān)穩(wěn)壓器） |
| 文件頁數(shù)： | 1/11頁 |
| 文件大小： | 99K |
| 代理商： | L4976 |
UP TO 1A STEPDOWN CONVERTER
OPERATING INPUT VOLTAGE FROM 8V TO
55V
PRECISE 5.1V REFERENCE VOLTAGE
OUTPUT VOLTAGE ADJUSTABLE FROM
3.3V TO 50V
SWITCHING FREQUENCY ADJUSTABLE UP
TO 500KHz
VOLTAGEFEEDFORWARD
ZERO LOAD CURRENT OPERATION
INTERNAL CURRENT LIMITING (PULSE-BY-
PULSE AND HICCUP MODE)
INHIBIT FOR ZERO CURRENT CONSUMP-
TION
PROTECTION AGAINST FEEDBACK DIS-
CONNECTION
THERMALSHUTDOWN
DESCRIPTION
The L4976 is a step down monolithic power
switching regulator delivering 1A at a voltage be-
tween 3.3V and 50V (selectedby a simple exter-
nal divider). Realized in BCD mixed technology,
the device uses an internalpower D-MOStransis-
tor (with a typical Rdson of 0.25
) to obtain very
high efficencyand high switchingspeed.
A switching frequency up to 500KHz is achiev-
able (the maximum power dissipation of 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
disconnectionandthermal shutdown.
The device is available in plastic dual in line,
MINIDIP 8 for standard assembly, and SO16W
for SMD assembly.
June 1998
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
TYPICALAPPLICATION CIRCUIT
1/11
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| L4977A | Power Switching Regulator(功率開關(guān)穩(wěn)壓器) |
| L4978D | Isolated Flyback Switching Regulator with 9V Output |
| L4978 | 2A Step Down Switching Regulator(步降開關(guān)穩(wěn)壓器) |
| L4979MD13TR | LOW DROP VOLTAGE REGULATOR |
| L4979D | LOW DROP VOLTAGE REGULATOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L4976(D) | 制造商:STMicroelectronics 功能描述:Bulk |
| L4976_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1A step down switching regulator |
| L4976D | 功能描述:直流/直流開關(guān)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(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 |
| L4976D013TR | 功能描述:直流/直流開關(guān)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(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 |
| 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 |
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