欢迎访问ic37.com |
会员登录 免费注册
发布采购

L4973D5.1 参数 Datasheet PDF下载

L4973D5.1图片预览
型号: L4973D5.1
PDF下载: 下载PDF文件 查看货源
内容描述: 3.5A降压开关稳压器 [3.5A step down switching regulator]
分类和应用: 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管PC
文件页数/大小: 27 页 / 368 K
品牌: STMICROELECTRONICS [ STMICROELECTRONICS ]
 浏览型号L4973D5.1的Datasheet PDF文件第2页浏览型号L4973D5.1的Datasheet PDF文件第3页浏览型号L4973D5.1的Datasheet PDF文件第4页浏览型号L4973D5.1的Datasheet PDF文件第5页浏览型号L4973D5.1的Datasheet PDF文件第6页浏览型号L4973D5.1的Datasheet PDF文件第7页浏览型号L4973D5.1的Datasheet PDF文件第8页浏览型号L4973D5.1的Datasheet PDF文件第9页  
L4973
3.5A step down switching regulator
Features
Up to 3.5A step down converter
Operating input voltage from 8V to 55V
3.3V and 5.1V (±1%) fixed output, and
adjustable outputs from:
– 0.5V to 50V (3.3 type)
– 5.1V to 50V (5.1 type)
Frequency adjustable up to 300kHz
Voltage feed forward
Zero load current operation (min 1mA)
Internal current limiting (pulse by pulse and
HICCUP mode)
Precise 5.1V (1.5%) reference voltage
externally available
Input/output synchronization function
Inhibit for zero current consumption (100mA
typ. at V
CC
= 24V)
Protection against feedback disconnection
Thermal shutdown
Output over voltage protection
Soft start function
DIP-18 (12+3+3)
SO-20 (12+4+4)
Description
The L4973 is a step down monolithic power
switching regulator delivering 3.5A at fixed
voltages of 3.3V or 5.1V and using a simple
external divider output adjustable voltage up to
50V. Realized in BCD mixed technology, the
device uses an internal power D-MOS transistor
(with a typical R
DS(on)
of 0.15Ω) to obtain very
high efficiency and very fast switching times.
Switching frequency up to 300KHz are 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 40V
cover the majority of the today applications.
Features of this new generation of DC-DC
converter includes pulse by pulse current limit,
hiccup mode for output short circuit protection,
voltage feed forward regulation, soft start,
input/output synchronization, protection against
feedback loop disconnection, inhibit for zero
current consumption and thermal shutdown.
Packages available are in plastic dual in line, DIP-
18 (12+3+3) for standard assembly, and SO20
(12+4+4) for SMD assembly.
8
12
9
1
4,5,6,10
13,14,15
C
BOOT
V
O
(3.3V or 5.1V)
L1
Figure 1.
Internal schematic diagram
V
CC
(8V to 55V)
R
OSC
7
L4973
16
17
11
C
IN
C2
3
2
R
COMP
C
OSC
C
SS
C
COMP
D1
C
OUT
D97IN554A
May 2007
Rev 17
1/27
27