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參數資料
| 型號： | L4978 |
| 廠商： | 意法半導體 |
| 英文描述： | 2A Step Down Switching Regulator(步降開關穩壓器) |
| 中文描述： | 第2A降壓開關穩壓器（步降開關穩壓器） |
| 文件頁數： | 1/13頁 |
| 文件大小： | 577K |
| 代理商： | L4978 |
1/13
L4978
May 2005
1
■
UP TO 2A 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
Features
2
The L4978 is a step down monolithic power
switching regulator delivering 2A 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 R
dson
of 0.25
) to obtain very high
DESCRIPTION
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 be-
tween 8V to 55V and output voltages regulated
from 3.3V to 50V cover the majority of today’s ap-
plications. Features of this new generations of DC-
DC converter include pulse-by-pulse current limit,
hiccup mode for short circuit protection, voltage
feedforward regulation, soft-start, protection
against feedback loop disconnection, inhibit for
zero current consumption and thermal shutdown.
The device is available in plastic dual in line, DIP-
8 for standard assembly, and SO16W for SMD as-
sembly.
2A STEP DOWN SWITCHING REGULATOR
Figure 2. Typical Application Circuit
D98IN837A
5
2
8
4
1
L4978
C
1
220
μ
F
63V
C
8
330
μ
F
V
O
=3.3V/2A
Vi=8V to 55V
R
1
20K
C
2.7nF
R
2
9.1K
C
22nF
3
7
L1
126
μ
H
(77120)
6
D1
ST
PS3L60U
C
100nF
C
220nF
C
100nF
Rev. 9
Figure 1. Packages
Table 1. Order Codes
Part Number
L4978
L4978D
L4978D013TR
Package
DIP-8
SO16
SO16 in Tape & Reel
DIP-8
SO16W
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| L4979MD | LOW DROP VOLTAGE REGULATOR |
| L4979D13TR | LOW DROP VOLTAGE REGULATOR |
| L497D1 | HALL EFFECT PICKUP IGNITION CONTROLLER |
相關代理商/技術參數 |
參數描述 |
|---|---|
| L4978_05 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2A STEP DOWN SWITCHING REGULATOR |
| L4978D | 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 |
| L4978D013TR | 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 |
| L4979D | 功能描述:低壓差穩壓器 - LDO Lo DROP Vltg REG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| L4979D_06 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW DROP VOLTAGE REGULATOR |
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