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參數資料
| 型號： | L4971 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩壓器 |
| 英文描述： | 3 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | MINI, PLASTIC, DIP-8 |
| 文件頁數： | 1/13頁 |
| 文件大小： | 571K |
| 代理商： | L4971 |
1/13
L4971
May 2005
1
FEATURES
■ UP TO 1.5A STEP DOWN CONVERTER
■ OPERATING INPUT VOLTAGE FROM 8V TO
55V
■ PRECISE 3.3V (±1%) INTERNAL
REFERENCE VOLTAGE
■ OUTPUT VOLTAGE ADJUSTABLE FROM
3.3V TO 50V
■ SWITCHING FREQUENCY ADJUSTABLE UP
TO 300KHz
■ VOLTAGE FEEDFORWARD
■ ZERO LOAD CURRENT OPERATION
■ INTERNAL CURRENT LIMITING (PULSE-
BYPULSE AND HICCUP MODE)
■ INHIBIT FOR ZERO CURRENT
CONSUMPTION
■ PROTECTION AGAINST FEEDBACK
DISCONNECTION
■ THERMAL SHUTDOWN
■ SOFT START FUNCTION
2
DESCRIPTION
The L4971 is a step down monolithic power
switching regulator delivering 1.5A at a voltage be-
tween 3.3V and 50V (selected by a simple external
divider). Realized in BCD mixed technology, the
device uses an internal power D-MOS transistor
(with a typical Rdson of 0.25
) to obtain very high
efficency and high switching speed.
A switching frequency up to 300KHz is achievable
(the maximum power dissipation of the packages
must be observed).
A wide input voltage range between 8V to 55V and
output voltages regulated from 3.3V to 50V cover
the majority of today’s applications.
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, soft-start, protection against feed-
back loop disconnection, inhibit for zero current
consumption and thermal shutdown.
The device is available in plastic dual in line, DIP8
for standard assembly, and SO16W for SMD as-
sembly.
1.5A STEP DOWN SWITCHING REGULATOR
Rev. 11
Figure 1. Package
Table 1. Order Codes
Part Number
Package
L4971
DIP8
L4971D
SO16W
L4971D013TR
SO16 in Tape & Reel
SO16W
DIP8
Figure 1. Block Diagram
D97IN748A
5
2
8
4
1
L4971
C1
220
F
63V
C8
330
F
VO=3.3V/1.5A
Vi=8V to 55V
R1
20K
C2
2.7nF
R2
9.1K
C4
22nF
3
7
L1
126
H
(77120)
6
D1
STPS
3L60U
C5
100nF
C7
220nF
C6
100nF
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相關代理商/技術參數 |
參數描述 |
|---|---|
| L4971(D) | 制造商:STMicroelectronics 功能描述:Bulk |
| L4971_05 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1.5A STEP DOWN SWITCHING REGULATOR |
| L4971D | 功能描述:直流/直流開關調節器 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 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L4971D013TR | 功能描述:直流/直流開關調節器 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 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L4972 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2A SWITCHINGREGULATOR |
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