Configurable, Dual 3 A/Single 6 A,
Synchronous, Step-Down DC-to-DC Regulator
ADP2116
FEATURES
TYPICAL APPLICATION CIRCUIT
V
= 5V
IN
Configurable 3 A/3 A or 3 A/2 A dual-output load
combinations or 6 A combined single-output load
High efficiency: up to 95%
10Ω
1µF
100kΩ
100kΩ
EN2
EN1
VIN1
VIN2
Input voltage, VIN: 2.75 V to 5.5 V
VIN4
22µF
22µF
VIN5
VIN6
Selectable fixed output voltage of 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V,
or 3.3 V, or adjustable output voltage to 0.6 V minimum
1.5% accurate reference voltage
Selectable switching frequency of 300 kHz, 600 kHz, 1.2 MHz,
or synchronized from 200 kHz to 2 MHz
Optimized gate slew rate for reduced EMI
External synchronization input or internal clock output
Dual-phase, 180° phase-shifted PWM channels
Current mode for fast transient response
Pulse skip mode with light loads or forced PWM operation
Input undervoltage lockout (UVLO)
VIN3
PGOOD1
SW1
PGOOD2
PGOOD1
= 2.5V, 3A
PGOOD2
3.3µH
V
OUT1
V
= 1.2V, 3A
2.2µH
OUT2
SW3
ADP2116
SW2
PGND1
PGND2
47µF
22µF
SW4
47µF
100µF
SYNC
PGND3
PGND4
FB1
FB2
27kΩ
V1SET
V2SET
4.7kΩ
SYNC/CLKOUT
COMP2
COMP1
SS1
30kΩ
10nF
30kΩ
SS2
10nF
820pF
820pF
8.2kΩ
fSW = 600kHz
Independent enable inputs and power-good outputs
Overcurrent and thermal overload protection
Programmable soft start
Figure 1.
100
32-lead, 5 mm × 5 mm LFCSP package
V
= 5.0V; V = 2.5V
OUT
IN
95
90
85
80
75
70
65
60
V
= 5.0V; V = 3.3V
OUT
APPLICATIONS
IN
Point-of-load regulation
Telecommunications and networking systems
Consumer electronics
Industrial and instrumentation
Medical
GENERAL DESCRIPTION
V
= 3.3V; V = 1.2V
OUT
IN
The ADP2116 is a versatile, synchronous, step-down switching
regulator that satisfies a wide range of customer point-of-load
requirements. The two PWM channels can be configured to deliver
independent outputs at 3 A and 3 A (or at 3 A and 2 A) or can be
configured as a single interleaved output capable of delivering 6 A.
The two PWM channels are 180° phase shifted to reduce input
ripple current and input capacitance.
fSW = 600kHz
10k
10
100
1k
LOAD CURRENT (mA)
Figure 2. Typical Efficiency vs. Load Current
synchronization pin is also configurable as a 90° out-of-phase
output clock, providing the possibility for a stackable
multiphase power solution.
The ADP2116 provides high efficiency and can operate at
switching frequencies of up to 2 MHz. At light loads, the ADP2116
can be set to operate in pulse skip mode for higher efficiency or
in forced PWM mode for noise sensitive applications.
The ADP2116 input voltage range is from 2.75 V to 5.5 V and can
convert to a fixed output of 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, or 3.3 V
that can be set independently for each channel using external
resistors. If a resistor divider is used, the output voltage can be
set as low as 0.6 V. The ADP2116 operates over the −40°C to
+125°C junction temperature range.
The ADP2116 is designed with an optimized slew rate to reduce
EMI emissions, allowing the device to power sensitive, high perfor-
mance signal chain circuits. The switching frequency can be set
to 300 kHz, 600 kHz, or 1.2 MHz, or it can be synchronized to an
external clock that minimizes the system noise. The bidirectional
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
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.
Trademarks and registeredtrademarks arethe 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
©2009 Analog Devices, Inc. All rights reserved.
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