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PDF ADP2311 Data sheet ( Hoja de datos )
| Número de pieza | ADP2311 | |
| Descripción | Synchronous Step-Down Regulator | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
Dual 1 A, 18 V, Synchronous Step-Down
Regulator with Fail-Safe Voltage Monitoring
ADP2311
FEATURES
Input voltage: 4.5 V to 18 V
±1.0% output accuracy
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
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
GENERAL DESCRIPTION
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 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.
TYPICAL APPLICATION CIRCUIT
VIN
CIN1
RPFI_TOP
RPFI_BOT
VOUT1
COUT1
C1BST
L1
RTOP1
RBOT1
PFO POR WDI RSTO
EN
PVIN1
PVIN2
PFI VM2
RVM2_TOP
RVM2_BOT
VIN
CIN2
BST1 ADP2311 BST2
SW1
PGND1
FB1
GND VREG
SW2
PGND2
FB2
TIMER
C2BST
L2
RTOP2
RBOT2
CVREG
CTIMER
VOUT2
COUT2
Figure 1.
100
VOUT = 3.3V
95 VOUT = 5V
90
85
80
75
70
65
60
55
50
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
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 also includes undervoltage lockout (UVLO),
overvoltage protection (OVP), overcurrent protection (OCP),
and thermal shutdown (TSD).
The ADP2311 operates over the −40°C to +125°C junction
temperature range and is available in a 24-lead LFCSP package.
Rev. A
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 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 ©2014 Analog Devices, Inc. All rights reserved.
Technical Support www.analog.com
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1 page  
Data Sheet
Parameter
VOLTAGE MONITOR COMPARATOR
VM2 Input Threshold
VM2 Input Hysteresis
VM2 Leakage Current
POR TIMER
TIMER Pin Pull-Up Current
WATCHDOG
Reset Threshold Voltage
Reset Threshold Hysteresis
Reset Timeout Period
Watchdog Timeout Period
Option 1
Option 2
Option 3
Option 4
WDI Pulse Width
WDI Input High Voltage
WDI Input Low Voltage
RSTO Output Low Voltage
RSTO Leakage Current
THERMAL
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Symbol
Test Conditions/Comments
VM2 pin
Falling threshold
TIMER pin
WDI and RSTO pins
Senses VFB2
tRP
tWD See the Ordering Guide
IRSTO = 1 mA
VRSTO = 5 V
Min
0.585
93.5
0.883
83
41
125
167
80
1.2
Typ
0.6
50
10
3
95
1.5
1
100
50
150
200
65
0.1
150
15
ADP2311
Max
0.615
65
50
96.5
1.17
117
58
175
233
0.4
90
1
Unit
V
mV
nA
µA
%
%
ms
ms
ms
ms
ms
ns
V
V
mV
µA
°C
°C
Rev. A | Page 5 of 20
Free Datasheet http://www.Datasheet4U.com
5 Page 
Data Sheet
160
150
140
130
120
110
100
90
80
70
60
50
–40 –20
0
20 40 60 80 100 120
TEMPERATURE (°C)
Figure 23. High-Side MOSFET RDSON vs. Temperature
VOUT1 (AC)
1
SW1
2
VOUT2 (AC)
3
SW2
4
CH1 20mV
CH3 20mV
BW CH2 20V M4µs
A CH4
BW CH4 20V T 50.40%
Figure 24. Working Mode Waveform
7.2V
VOUT (AC)
1
IOUT
4
CH1 100mV BW
M200µs
A CH4
CH4 500mA Ω BW T 20.2%
720mA
Figure 25. Load Transient Response, 0.25 A to 0.75 A
ADP2311
90
85
80
75
70
65
60
55
50
45
40
–40 –20
0
20 40 60 80 100 120
TEMPERATURE (°C)
Figure 26. Low-Side MOSFET RDSON vs. Temperature
EN
1
VOUT1
2
VOUT2
3
POR
4
CH1 5V BW CH2 2V BW
CH3 2V BW CH4 2V
M1ms
T 20.40%
A CH1
Figure 27. Soft Start with Full Load
3V
VIN
SW
1
2
VOUT (AC)
3
CH1 5V
BW CH2 10V BW M1ms
A CH1 10.7V
CH3 20mV BW
T 20.40%
Figure 28. Line Transient Response, VIN from 8 V to 14 V, IOUT = 1 A
Rev. A | Page 11 of 20
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