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
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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.
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Tel: 781.329.4700 ©2014–2017 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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