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参数资料
| 型号： | L4974A |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 5.5 A SWITCHING REGULATOR, 200 kHz SWITCHING FREQ-MAX, PDIP20 |
| 封装： | POWER, PLASTIC, DIP-20 |
| 文件页数： | 1/22页 |
| 文件大小： | 6679K |
| 代理商： | L4974A |
L4974A
June 2000
3.5A SWITCHING REGULATOR
.
3.5A OUTPUT CURRENT
.
5.1V TO 40V OUTPUT VOLTAGE RANGE
.
0 TO 90% DUTY CYCLE RANGE
.
INTERNAL FEED-FORWARD LINE REG.
.
INTERNAL CURRENT LIMITING
.
PRECISE 5.1V
± 2% ON CHIP REFERENCE
.
RESET AND POWER FAIL FUNCTIONS
.
INPUT/OUTPUT SYNC PIN
.
UNDER VOLTAGE LOCK OUT WITH HYS-
TERETIC TURN-ON
.
PWM LATCH FOR SINGLE PULSE PER PE-
RIOD
.
VERY HIGH EFFICIENCY
.
SWITCHING FREQUENCY UP TO 200KHz
.
THERMAL SHUTDOWN
.
CONTINUOUS MODE OPERATION
DESCRIPTION
The L4974A is a stepdown monolithic power switch-
ing regulator delivering 3.5A at a voltage variable
from 5.1 to 40V.
Realized with BCD mixed technology, the device
uses a DMOS output transistor to obtain very high
efficiency and very fast switching times. Features of
BLOCK DIAGRAM
POWERDIP (16 + 2 + 2)
the L4974A include reset and power fail for micro-
processors, feed forward line regulation, soft start,
limiting current and thermal protection. The device
is mounted in a Powerdip 16 + 2 + 2 plastic package
and requires few external components. Efficient
operation at switching frequencies up to 200KHz
allows reduction in the size and cost of external filter
component.
ORDERING NUMBER : L4974A
1/22
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
MULTIPOWER BCD TECHNOLOGY
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L4974A | 制造商:STMicroelectronics 功能描述:IC SWITCHING REG 3.5A 4974 DIP20 |
| L4974AE | 制造商:STMicroelectronics 功能描述: |
| L4975 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5A SWITCHING REGULATOR |
| L4975A | 功能描述:直流/直流开关调节器 5.1 to 40V Step-Down RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| L4975A | 制造商:STMicroelectronics 功能描述:SWITCHING REG 5A 4975 MULTIWATT15 |
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