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參數(shù)資料
| 型號(hào)： | L4978 |
| 廠商： | STMICROELECTRONICS |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 3.5 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | MINI, PLASTIC, DIP-8 |
| 文件頁(yè)數(shù)： | 1/13頁(yè) |
| 文件大小： | 581K |
| 代理商： | L4978 |
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L4978
May 2005
1
Features
■ 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
2
DESCRIPTION
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 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 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
C1
220
F
63V
C8
330
F
VO=3.3V/2A
Vi=8V to 55V
R1
20K
C2
2.7nF
R2
9.1K
C4
22nF
3
7
L1
126
H
(77120)
6
D1
ST
PS3L60U
C5
100nF
C7
220nF
C6
100nF
Rev. 9
Figure 1. Packages
Table 1. Order Codes
Part Number
Package
L4978
DIP-8
L4978D
SO16
L4978D013TR
SO16 in Tape & Reel
DIP-8
SO16W
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L497B | SPECIALTY ANALOG CIRCUIT, PDIP16 |
| L4981BD013TR | 2 A POWER FACTOR CONTROLLER, 115 kHz SWITCHING FREQ-MAX, PDSO20 |
| L4985D | 1.5 A SWITCHING REGULATOR, 83 kHz SWITCHING FREQ-MAX, PDSO20 |
| L4992 | SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PQFP32 |
| L5953 | 1.2 A SWITCHING REGULATOR, 425 kHz SWITCHING FREQ-MAX, PDSO36 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L4978_05 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:2A STEP DOWN SWITCHING REGULATOR |
| L4978D | 功能描述:直流/直流開(kāi)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(kāi)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 |
| L4978D013TR | 功能描述:直流/直流開(kāi)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(kāi)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 |
| L4979D | 功能描述:低壓差穩(wěn)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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| L4979D_06 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:LOW DROP VOLTAGE REGULATOR |
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