双通道、5
A、20 V同步
降压调节器，集成高端MOSFET
ADP2325
产品特性
输入电压：4.5
V至20 V
输出精度：±1%
集成48
m
高端MOSFET(典型值)
灵活的输出配½
双路输出：5
A/5 A
单路交错式输出：10
A
可编程开关频率：250
kHz至1.2 MHz
外部同步输入，可编程相移，或内部时钟输出
可选PWM或PFM工½模式
小型电感的限流可调
外部补偿和½启动
启动后进入预充电输出
ADIsimPower™设计工具支持
TYPICAL APPLICATION CIRCUIT
R
TOP1
C
C1
C
SS1
R
C1
COMP1
SS1
EN1
PVIN1
BST1
FB1
C
IN1
V
IN
R
BOT1
INTVCC
MODE
SCFG
TRK2
TRK1
C
DRV
VDRV
GND
PGOOD2
COMP2
C
BST1
L1
SW1
M1
DL1
C
OUT1
V
OUT1
C
INT
ADP2325
PGND
M2
DL2
SW2
PVIN2
BST2
EN2
C
OUT2
L2
V
OUT2
SS2
FB2
PGOOD1
SYNC
RT
R
OSC
R
BOT2
R
TOP2
应用
通信基础设½
½络和服务器
工业与仪器仪表
医疗保健
中间供电½½换
典型应用电路
C
BST2
R
C2
C
C2
C
SS2
C
IN2
V
IN
10036-001
图1.
概述
ADP2325是一款功½全面的双通道降压DC-DC调节器，采
用电流模式架构。ADP2325集成两个高端功率MOSFET开
关和两个½端驱动器，可控制外部N沟道MOSFET。采用
两个脉冲½度调制(PWM)通道，提供5
A双路输出，或10 A
单路交错式输出。支持4.5
V至20 V输入电源电压范围，输
出电压可½至0.6
V。
开关频率可设½，范围介于250
kHz至1.2 MHz之间，或与
外部时钟同步，将多½应用的干扰降至最½。PWM双通
道180°错相工½，因此½降½输入电流纹波，并减小输入
电容的尺寸。
双向同步引脚可配½为60°、90°或120°相移，以提供堆叠
式多相功率解决方案。
½ ½½ 时 ， 为 获 得 更 高 功 效 ，
ADP2325以
脉 冲 频 率 调 制
(PFM)模式工½；在噪声敏感应用中则以强制PWM模式工
½。外部补偿和½启动提供设计灵活性。
EFFICIENCY (%)
独立的½½输入和电源良½输出提供可靠的电源时序。为
提高系统可靠性，器件包括欠压闭锁(UVLO)、过压保护
(OVP)、过流保护和热关断等特性。
ADP2325在-40°C至+125°C的结温范围内工½，采用32引脚
LFCSP_WQ封装。
100
95
90
85
80
75
70
65
60
55
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
10036-002
V
OUT
= 5.0V
V
OUT
= 3.3V
50
OUTPUT CURRENT (A)
图2.效率与输出电流的关系(V
IN
= 12 V，f
SW
= 600 kHz)
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Speci cations subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2012 Analog Devices, Inc. All rights reserved.
ADI中文版数据手册是英文版数据手册的译文，敬请谅解翻译中可½存在的语言组织或翻译错误，ADI不对翻译中存在的差异或由此产生的错误负责。如需确认任½词语的准确性，请参考ADI提供
的最新英文版数据手册。
ADP2325
目½
特性......................................................................................................1
应用......................................................................................................1
应用电路
.............................................................................................1
概述......................................................................................................1
修订历史
.............................................................................................2
功½框图
.............................................................................................3
技术规格
.............................................................................................4
绝对最大额定值...........................................................................6
热阻
................................................................................................6
ESD警告.........................................................................................6
引脚配½和功½描述
.......................................................................7
典型工½特性
....................................................................................9
工½原理
...........................................................................................16
控制方案......................................................................................16
PWM模式....................................................................................16
PFM模式......................................................................................16
精密½½/关断
...........................................................................16
单独的输入电压.........................................................................16
内部调节器(INTVCC)..............................................................16
自举电路......................................................................................17
½端驱动器
.................................................................................17
振荡器
..........................................................................................17
同步
..............................................................................................17
½启动
..........................................................................................17
峰值限流和短路保护................................................................17
电压跟踪......................................................................................18
并行操½......................................................................................18
电源良½......................................................................................19
过压保护......................................................................................19
欠压闭锁......................................................................................19
热关断
..........................................................................................19
应用信息
...........................................................................................20
ADIsimPower设计工具 ............................................................20
输入电容选择
.............................................................................20
输出电压设½
.............................................................................20
电压½换限制
.............................................................................20
限流设½......................................................................................20
电感选择......................................................................................21
输出电容选择
.............................................................................21
½端功率器件选择
....................................................................22
UVLO输入编程..........................................................................22
补偿器件设计
.............................................................................23
设计示例
...........................................................................................24
输出电压设½
.............................................................................24
限流设½......................................................................................24
频率设½......................................................................................24
电感选择......................................................................................24
输出电容选择
.............................................................................24
½端MOSFET选择.....................................................................25
补偿器件......................................................................................25
½启动时间编程.........................................................................26
输入电容选择
.............................................................................26
外部器件推荐
..................................................................................27
典型应用电路
..................................................................................28
封装和订购信息..............................................................................32
外½尺寸......................................................................................32
订购指南......................................................................................32
修订历史
2012年7月—修订版0至修订版A
增加“ADIsimPower设计工具”部分.............................................20
更改订购指南
..................................................................................32
2012年2月—修订版0：初始版
Rev. A | Page 2 of 32
电源技术
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