Configurable, Dual 2 A/Single 4 A,

Synchronous Step-Down DC-to-DC Regulator

ADP2114

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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

©2009 Analog Devices, Inc. All rights reserved.

FEATURES

Configurable 2 A/2 A or 3 A/1 A dual output load

combinations or 4 A combined single output

High efficiency: up to 95%

Selectable fixed output: 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V or

adjustable output voltage to 0.6 V minimum

±1.5% accurate reference voltage

Selectable switching frequency: 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 under light load or forced PWM operation

Input undervoltage lockout (UVLO)

Independent enable inputs and PGOOD outputs

Overcurrent and thermal overload protection

Externally programmable soft start

32-lead 5 mm × 5 mm LFCSP package

APPLICATIONS

Point of load regulation

Telecommunications and networking systems

Consumer electronics

Industrial and Instrumentation

Medical

GENERAL DESCRIPTION

The ADP2114 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 2 A and 2 A (or 3 A/1 A) or can be

configured as a single interleaved output capable of delivering 4 A.

The two PWM channels are 180º phase shifted to reduce input

ripple current and to reduce input capacitance.

The ADP2114 provides high efficiency and operates at switching

frequencies of up to 2 MHz. At light loads, the ADP2114 can be

set to operate in pulse skip mode for higher efficiency or in forced

PWM mode to reduce EMI.

The ADP2114 is designed with an optimized gate slew rate to reduce

EMI emissions, allowing it to power sensitive, high performance

signal chain circuits. The switching frequency can be set to 300 kHz,

600 kHz, or 1.2 MHz and can be synchronized to an external clock

that minimizes the system noise. The bidirectional synchronization

pin is also configurable as a 90° out-of-phase output clock, providing

the possibility for a stackable multiphase power solution.

TYPICAL APPLICATION CIRCUIT

22kΩ

1.2nF

22kΩ

1.2nF

47µF

4.7µH

47µF

22µF

22µF

1µF

22µF

2.2µH

10Ω

100kΩ

100kΩ

47kΩ

V1SET

15kΩ

VIN1

VIN2

VIN3

SW1

SW2

FB1

COMP1

SS1

EN1

COMP2

PGND4

PGND3

FB2

V2SET

SYNC/CLKOUT

SW4

SW3

VIN6

VIN5

VIN4

EN2

PGOOD2

ADP2114

PGOOD2

SYNC

PGOOD1

8.2kΩ

SS2

10nF

10nF

PGND1

PGND2

PGOOD1

Figure 1.

The ADP2114 input voltage range is from 2.75 V to 5.5 V, and it

converts to fixed outputs 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. Using a resistor divider, it is also possible to

set the output voltage as low as 0.6 V. The ADP2114 operates

over the −40°C to +125°C junction temperature range.

100

70

75

80

85

90

95

0.01

0.1

1

3

LOAD CURRENT (A)

Figure 2. Typical Efficiency vs. Load Current