参数资料
型号: A8697ELJTR-T
厂商: Allegro Microsystems Inc
文件页数: 2/13页
文件大小: 0K
描述: IC REG BUCK ADJ 4A 8SOIC
标准包装: 1
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.8 V ~ 20 V
输入电压: 8 V ~ 25 V
PWM 型: 电流模式
电流 - 输出: 4A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm Width)裸露焊盘
包装: 标准包装
供应商设备封装: 8-SOIC-EP
产品目录页面: 1142 (CN2011-ZH PDF)
其它名称: 620-1178-6
A8697
Wide Input Voltage 4.0 A Step Down Regulator
Features and Benefits
Description
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8 to 25 V input range
Integrated DMOS switch
Adjustable fixed off-time
Adjustable output
The A8697 is a constant off-time current mode step-down
regulator with a wide input voltage range. Regulation voltage is
set by external resistors, to output voltages as low as 0.8 V.
The A8697 includes an integrated power DMOS switch to
reduce the total solution footprint. It also features internal
compensation, allowing users to design stable regulators with
minimal design efforts.
The off-time can be set with an external resistor, allowing
flexibility in inductor selection. Additionally, the A8697 has
a logic level enable pin which can shut the device down and
put it into a low quiescent current mode for power sensitive
applications.
Package: 8-Lead SOIC with exposed
The A8697 is supplied in a low-profile 8-lead SOIC with
exposed pad (package LJ). Applications include:
thermal pad (suffix LJ)
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Applications with 8 to 25 V input
Consumer electronics, networking equipment
12 V lighter-powered applications (portable DVD, etc.)
Point of Sale (POS) applications
Approximate Scale 1:1
Typical Application
V IN
+12 V
Efficiency versus Load Current
CBOOT
0.01 μ F
+
CIN
47 μ F
25 V
90
80
VOUT = 2.5 V
BOOT
ENB
A8697
VIN
LX
L
3.8 μ H
V OUT
1.06 V/ 4.0 A
70
60
50
40
VOUT = 1.8 V
VOUT = 1.06 V
RTSET
51.1 k
TSET
GND
VBIAS
FB
D1
R1
2k
+
COUT
150 μ F
56 m Ω
30
20
10
Ratings:
L: CDRH104R-3R8
COUT: EEUFM1V151
R2
6.14 k
0
0
1
2
Load Current (A)
3
4
CIN: EEVFC1H470P
Circuit for 12 V step down to 1.06 V at 4 A
A8697-DS, Rev. 3
Efficiency curve for circuit at left
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