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ADP2325-BL2-EVZ PDF预览

ADP2325-BL2-EVZ

更新时间: 2024-11-06 07:18:47
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亚德诺 - ADI /
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描述
Dual 5 A, 20 V Synchronous Step-Down

ADP2325-BL2-EVZ 数据手册

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Dual 5 A, 20 V Synchronous Step-Down  
Regulator with Integrated High-Side MOSFET  
Data Sheet  
ADP2325  
FEATURES  
TYPICAL APPLICATION CIRCUIT  
Input voltage: 4.5 V to 20 V  
1% output accuracy  
V
R
IN  
TOP1  
C
C
IN1  
C1  
Integrated 48 mΩ typical high-side MOSFET  
Flexible output configuration  
Dual output: 5 A/5 A  
C
SS1  
R
BOT1  
R
C1  
C
BST1  
L1  
INTVCC  
MODE  
C
V
OUT1  
INT  
Parallel single output: 10 A  
SW1  
SCFG  
TRK2  
TRK1  
Programmable switching frequency: 250 kHz to 1.2 MHz  
External synchronization input with programmable phase  
shift or internal clock output  
M1  
M2  
C
OUT1  
DL1  
PGND  
DL2  
VDRV  
C
DRV  
ADP2325  
GND  
Selectable PWM or PFM mode operation  
Adjustable current limit for small inductors  
External compensation and soft start  
Startup into precharged output  
C
OUT2  
L2  
PGOOD2  
V
OUT2  
PGOOD1  
SYNC  
RT  
SW2  
C
BST2  
Supported by ADIsimPowerTM design tool  
R
OSC  
R
C2  
R
BOT2  
V
APPLICATIONS  
IN  
C
C
C
IN2  
C2  
SS2  
Communications infrastructure  
Networking and servers  
R
TOP2  
Industrial and instrumentation  
Healthcare and medical  
Figure 1.  
Intermediate power rail conversion  
GENERAL DESCRIPTION  
The ADP2325 is a full featured, dual output, step-down dc-to-dc  
regulator based on a current mode architecture. The ADP2325  
integrates two high-side power MOSFETs and two low-side drivers  
for the external N-channel MOSFETs. The two pulse-width mod-  
ulation (PWM) channels can be configured to deliver dual 5 A  
outputs or a parallel-to-single 10 A output. The regulator operates  
from input voltages of 4.5 V to 20 V, and the output voltage can  
be as low as 0.6 V.  
Independent enable inputs and power-good outputs provide  
reliable power sequencing. To enhance system reliability, the device  
includes undervoltage lockout (UVLO), overvoltage protection  
(OVP), overcurrent protection, and thermal shutdown.  
The ADP2325 operates over the −40°C to +125°C junction  
temperature range and is available in a 32-lead LFCSP_WQ  
package.  
100  
V
V
= 5.0V  
= 3.3V  
OUT  
OUT  
The switching frequency can be programmed from 250 kHz to  
1.2 MHz, or it can be synchronized to an external clock to  
minimize interference in multirail applications. The dual PWM  
channels run 180° out of phase, thereby reducing input current  
ripple as well as reducing the size of the input capacitor.  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
The bidirectional synchronization pin can be programmed at  
a 60°, 90°, or 120° phase shift to provide for a stackable, multi-  
phase power solution.  
The ADP2325 can be configured to operate in pulse frequency  
modulation (PFM) mode at a light load for higher efficiency or  
in forced PWM mode for noise sensitive applications. External  
compensation and soft start provide design flexibility.  
0
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
OUTPUT CURRENT (A)  
Figure 2. Efficiency vs. Output Current at VIN = 12 V, fSW = 600 kHz  
Rev. 0  
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  
Fax: 781.461.3113  
www.analog.com  
©2012 Analog Devices, Inc. All rights reserved.  
 
 
 
 

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