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ADP2311ACPZ-1-R7

更新时间： 2024-11-07 02:50:47
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亚德诺 - ADI 监控
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20页 688K
描述
Dual 1 A, 18 V, Synchronous Step-Down Regulator with Fail-Safe Voltage Monitoring

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Dual 1 A, 18 V, Synchronous Step-Down  
Regulator with Fail-Safe Voltage Monitoring  
Data Sheet  
ADP2311  
FEATURES  
TYPICAL APPLICATION CIRCUIT  
Input voltage: 4.5 V to 18 V  
1.0% output accuracy  
PFO POR WDI  
EN  
PVIN1  
RSTO  
PVIN2  
V
IN  
V
IN  
Integrated MOSFET: 110 mΩ/60 mΩ typical  
Continuous output current: 1 A/1 A  
Power fail comparator generates warning  
Power-on reset with programmable delay timer  
Adjustable voltage monitor for power-down (Channel 2)  
Watchdog refresh input  
Dual phase with 180° out-of-phase operation  
Fixed switching frequency: 300 kHz  
Internal compensation and soft start  
Stable with low ESR output ceramic capacitors  
Precision enable input  
R
R
R
PFI_TOP  
VM2_TOP  
C
IN1  
C
PFI  
VM2  
IN2  
R
PFI_BOT  
VM2_BOT  
BST1  
ADP2311 BST2  
C1  
C2  
BST  
L1  
BST  
V
V
L2  
OUT2  
C
OUT1  
SW1  
PGND1  
SW2  
PGND2  
R
OUT2  
R
C
TOP1  
BOT1  
TOP2  
OUT1  
FB1  
FB2  
R
R
TIMER  
BOT2  
GND VREG  
C
C
TIMER  
VREG  
Figure 1.  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
V
V
= 3.3V  
= 5V  
OUT  
OUT  
Power feedback during power-off  
UVLO, OCP, OVP, and thermal shutdown protection  
APPLICATIONS  
Industrial and instrumentation  
Healthcare and medical  
DC-to-DC point of load applications  
0
0.2  
0.4  
0.6  
0.8  
1.0  
OUTPUT CURRENT (A)  
Figure 2. Efficiency vs. Output Current at VIN = 12 V, fSW = 300 kHz  
GENERAL DESCRIPTION  
An on-chip watchdog timer can reset the microprocessor if it  
fails to strobe within a preset timeout period. Accurate voltage  
monitoring circuitry and a power fail comparator provide a  
controlled power-up and power-down sequence to enhance  
system reliability.  
The ADP2311 is a fully integrated, dual output, synchronous  
step-down dc-to-dc regulator. The regulator operates from input  
voltages of 4.5 V to 18 V, and the output can regulate down to  
0.6 V. Each channel can provide up to 1 A of continuous output  
current.  
The ADP2311 also includes undervoltage lockout (UVLO),  
overvoltage protection (OVP), overcurrent protection (OCP),  
and thermal shutdown (TSD).  
The ADP2311 integrates the high-side and low-side MOSFETs  
to provide a very high efficiency, compact solution. Both channels  
of the regulator run at 180° out of phase to reduce the input ripple  
current and the input capacitor size, thereby helping to lower  
system electromagnetic interference (EMI). The ADP2311 also  
integrates internal compensation and soft start circuitry to simplify  
the design.  
The ADP2311 operates over the −40°C to +125°C junction  
temperature range and is available in a 24-lead LFCSP package.  
Rev. B  
Document Feedback  
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  
rightsof third parties that may result fromits use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks andregisteredtrademarks 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 ©2014–2017 Analog Devices, Inc. All rights reserved.  
Technical Support  
www.analog.com  
 
 
 
 
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