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ADP1148AN-3.3 PDF预览

ADP1148AN-3.3

更新时间: 2024-02-19 21:33:04
品牌 Logo 应用领域
亚德诺 - ADI 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
页数 文件大小 规格书
16页 194K
描述
Current-Mode SMPS Controller

ADP1148AN-3.3 技术参数

是否Rohs认证: 不符合生命周期:Obsolete
零件包装代码:DIP包装说明:DIP,
针数:14Reach Compliance Code:unknown
风险等级:5.83模拟集成电路 - 其他类型:SWITCHING CONTROLLER
控制模式:CURRENT-MODE控制技术:CONSTANT OFF TIME
最大输入电压:20 V最小输入电压:3.5 V
标称输入电压:12 VJESD-30 代码:R-PDIP-T14
JESD-609代码:e0长度:19.305 mm
湿度敏感等级:NOT SPECIFIED功能数量:1
端子数量:14最高工作温度:70 °C
最低工作温度:标称输出电压:3.33 V
封装主体材料:PLASTIC/EPOXY封装代码:DIP
封装形状:RECTANGULAR封装形式:IN-LINE
峰值回流温度(摄氏度):NOT SPECIFIED座面最大高度:5.33 mm
表面贴装:NO切换器配置:PUSH-PULL
最大切换频率:250 kHz温度等级:COMMERCIAL
端子面层:TIN LEAD端子形式:THROUGH-HOLE
端子节距:2.54 mm端子位置:DUAL
处于峰值回流温度下的最长时间:NOT SPECIFIED宽度:7.62 mm
Base Number Matches:1

ADP1148AN-3.3 数据手册

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High Efficiency Synchronous  
Step-Down Switching Regulators  
a
ADP1148, ADP1148-3.3, ADP1148-5  
FUNCTIO NAL BLO CK D IAGRAM  
ADJUSTABLE  
FEATURES  
Operation From 3.5 V to 18 V Input Voltage  
Ultrahigh Efficiency > 95%  
Low Shutdow n Current  
VERSION  
SIGNAL  
PWR  
GND  
V
V
P-DRIVE N-DRIVE  
GND SENSE(+)  
SENSE(–)  
7
IN  
FB  
Current Mode Operation for Excellent Line and Load  
Transient Response  
3
1
12  
11  
8
14  
9
ADP1148  
High Efficiency Maintained Over Wide Current Range  
Logic Controlled Micropow er Shutdow n  
Short Circuit Protection  
NON-OVERLAP  
DRIVE  
V
B
2
R
Very Low Dropout Operation  
SLEEP  
Q
S
1
Synchronous FET Sw itching for High Efficiency  
Adaptive Nonoverlap Gate Drives  
Q
R
S
C
S
V
TH1  
APPLICATIONS  
13k  
10mV to  
150mV  
V
TH2  
T
G
Notebook and Palm top Com puters  
Portable Instrum ents  
Battery Operated Digital Devices  
Industrial Pow er Distribution  
Avionics System s  
100k⍀  
1.25V  
V
IN  
OFF-TIME  
CONTROL  
REFERENCE  
SENSE(–)  
V
FB  
10  
5
4
6
I
SHUTDOWN  
INT V  
CC  
C
TH  
T
Telecom Pow er Supplies  
GPS System s  
Cellular Telephones  
T he constant off-time architecture maintains constant ripple  
current in the inductor, easing the design of wide input range  
converters. Current-mode operation provides excellent line and  
load transient response. T he operating current level is user  
programmable via an external current sense resistor.  
GENERAL D ESCRIP TIO N  
T he ADP1148 is part of a family of synchronous step-down  
switching regulator controllers featuring automatic sleep mode  
to maintain high efficiencies at low output currents. T hese  
devices drive external complementary power MOSFET s at  
switching frequencies up to 250 kHz using a constant off-time  
current-mode architecture.  
T he ADP1148 incorporates automatic Power Saving Sleep  
Mode operation when load currents drop below the level re-  
quired for continuous operation. In sleep mode, standby power  
is reduced to only about 2 mW at VIN = 10 V. In shutdown,  
both MOSFET s are turned off.  
TYP ICAL AP P LICATIO NS  
V
(5.2V TO 18V)  
IN  
100  
95  
90  
85  
80  
+
+
C
IN  
1F  
V
V
= 6V  
100F  
IN  
V
10nF  
IN  
INT V  
CC  
P-CH  
IRF7204  
P-DRIVE  
= 10V  
IN  
ADP1148  
R
**  
L*  
SENSE  
0V = NORMAL  
62H  
>1.5V = SHUTDOWN  
0.05⍀  
SHUTDOWN  
V
OUT  
5V/2A  
I
SENSE(+)  
TH  
1000pF  
R
C
C
SENSE(–)  
N-DRIVE  
T
+
C
OUT  
1k⍀  
75  
70  
N-CH  
IRF7403  
390F  
C
T
470pF  
FIGURE 1 CIRCUIT  
0.02  
C
C
C1  
S-GND P-GND  
3300pF  
10BQ040  
2
0.2  
LOAD CURRENT – A  
*COILTRONICS CTX-68-4  
**KRL SL-1-C1-0R050L  
Figure 1. High Efficiency Step-Down Converter  
REV. A  
Figure 2. ADP1148-5 Typical Efficiency  
Inform ation furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assum ed by Analog Devices for its  
use, nor for any infringem ents of patents or other rights of third parties  
which m ay result from its use. No license is granted by im plication or  
otherwise under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.  
Tel: 781/ 329-4700  
Fax: 781/ 326-8703  
World Wide Web Site: http:/ / w w w .analog.com  
© Analog Devices, Inc., 1997  

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