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PDF ADP2325 Data sheet ( Hoja de datos )
| Número de pieza | ADP2325 | |
| Descripción | 20 V Synchronous Step-Down Regulator | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
Dual 5 A, 20 V Synchronous Step-Down
Regulator with Integrated High-Side MOSFET
ADP2325
FEATURES
Input voltage: 4.5 V to 20 V
±1% output accuracy
Integrated 48 mΩ typical high-side MOSFET
Flexible output configuration
Dual output: 5 A/5 A
Parallel single output: 10 A
Programmable switching frequency: 250 kHz to 1.2 MHz
External synchronization input with programmable phase
shift or internal clock output
Selectable PWM or PFM mode operation
Adjustable current limit for small inductors
External compensation and soft start
Startup into precharged output
Supported by ADIsimPowerTM design tool
APPLICATIONS
Communications infrastructure
Networking and servers
Industrial and instrumentation
Healthcare and medical
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.
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.
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.
TYPICAL APPLICATION CIRCUIT
CINT
CDRV
ROSC
RTOP1
RBOT1
INTVCC
MODE
SCFG
TRK2
TRK1
VDRV
GND
CC1
CSS1
RC1
ADP2325
PGOOD2
PGOOD1
SYNC
RT
RBOT2
RTOP2
RC2
CC2
CSS2
CIN1
VIN
SW1
CBST1
L1
VOUT1
M1
DL1
COUT1
PGND
M2
DL2
SW2
COUT2
L2 VOUT2
CBST2
CIN2
VIN
Figure 1.
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 VOUT = 5.0V
95 VOUT = 3.3V
90
85
80
75
70
65
60
55
50
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
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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.
Free Datasheet http://www.Datasheet4U.com
1 page  
Data Sheet
Parameters
TRACKING INPUT (TRKx PINS)
TRKx Input Voltage Range
TRKx-to-FBx Offset Voltage
TRKx Input Bias Current
POWER GOOD (PGOODx PINS)
Power-Good Rising Threshold
Power-Good Hysteresis
Power-Good Deglitch Time
PGOODx Leakage Current
PGOODx Output Low Voltage
ENABLE (ENx PINS)
ENx Rising Threshold
ENx Falling Threshold
ENx Source Current
MODE (MODE PIN)
Input High Voltage
Input Low Voltage
THERMAL SHUTDOWN
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Symbol Test Conditions/Comments
TRKx = 0 mV to 500 mV
From FBx to PGOODx
VPGOOD = 5 V
IPGOOD = 1 mA
EN voltage below falling
threshold
EN voltage above rising
threshold
1 Tested in a feedback loop that adjusts VFB to achieve a specified voltage on the COMPx pin.
2 Pin-to-pin measurements.
3 Guaranteed by design.
ADP2325
Min Typ Max Unit
0 600 mV
−12 +12 mV
100 nA
87 90 93 %
5%
16 Clock cycles
0.1 1
µA
50 100 mV
1.2 1.28 V
1.02 1.1
V
5 µA
1 µA
1.3 V
0.4 V
150 °C
15 °C
Rev. 0 | Page 5 of 32
Free Datasheet http://www.Datasheet4U.com
5 Page 
Data Sheet
604
603
602
601
600
599
598
597
596
–40 –20
0
20 40 60 80 100
TEMPERATURE (°C)
Figure 17. Feedback Voltage vs. Temperature
120
660
ROSC = 100kΩ
640
620
600
580
560
540
–40
–20 0
20 40 60 80 100
TEMPERATURE (°C)
Figure 18. Frequency vs. Temperature
120
80
75
70
65
60
55
50
45
40
35
30
–40
–20 0
20 40 60 80 100
TEMPERATURE (°C)
Figure 19. MOSFET RDSON vs. Temperature
120
ADP2325
600
580
560
540
520
500
480
460
440
420
400
–40 –20
0
20 40 60 80 100 120
TEMPERATURE (°C)
Figure 20. Transconductance (gm) vs. Temperature
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
4 6 8 10 12 14 16 18 20
VIN (V)
Figure 21. INTVCC Voltage vs. VIN
4.5
4.3
4.1
3.9
3.7
3.5
3.3
3.1
2.9
2.7
–40 –20
0
20 40 60 80 100 120
TEMPERATURE (°C)
Figure 22. SSx Pin Source Current vs. Temperature
Rev. 0 | Page 11 of 32
Free Datasheet http://www.Datasheet4U.com
11 Page | ||
| Páginas | Total 32 Páginas | |
| PDF Descargar | [ Datasheet ADP2325.PDF ] | |
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