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Analog Devices Semiconductor Electronic Components Datasheet

ADP2114 Datasheet

Synchronous Step-Down DC-to-DC Regulator

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ADP2114 pdf
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Configurable, Dual 2 A/Single 4 A,
Synchronous Step-Down DC-to-DC Regulator
ADP2114
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%
Input voltage VIN: 2.75 V to 5.5 V
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.
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
TYPICAL APPLICATION CIRCUIT
VIN = 5V
100k
22µF
PGOOD2
VOUT2 = 1.8V, 2A 2.2µH
22µF 47µF
SYNC
15k
22k
1.2nF
10nF
10
1µF
EN2
EN1
VIN4
VIN1
VIN5
VIN2
VIN6
PGOOD2
VIN3
PGOOD1
SW3
ADP2114
SW1
SW2
SW4
PGND1
PGND3
PGND2
PGND4
FB1
FB2
V2SET
V1SET
SYNC/CLKOUT
COMP2
SS2
COMP1
SS1
100k
22µF
4.7µH
PGOOD1
VOUT1 = 3.3V, 2A
47µF
47k
10nF 22k
8.2k
1.2nF
fSW = 600kHz
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
VIN = 3.3V; VOUT = 1.8V
95
VIN = 5.0V; VOUT = 3.3V
90
85
80
VIN = 5.0V; VOUT = 1.8V
75
70
0.01
0.1 1
LOAD CURRENT (A)
3
Figure 2. Typical Efficiency vs. Load Current
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.


Analog Devices Semiconductor Electronic Components Datasheet

ADP2114 Datasheet

Synchronous Step-Down DC-to-DC Regulator

No Preview Available !

ADP2114 pdf
ADP2114www.DataSheet4U.com
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
General Description ......................................................................... 1 
Typical Application Circuit ............................................................. 1 
Revision History ............................................................................... 2 
Specifications..................................................................................... 3 
Absolute Maximum Ratings............................................................ 5 
ESD Caution.................................................................................. 5 
Pin Configuration and Function Descriptions............................. 6 
Typical Performance Characteristics ............................................. 8 
Supply Current............................................................................ 13 
Load Transient Response........................................................... 14 
Bode Plots.................................................................................... 19 
Simplified Block Diagram ............................................................. 20 
Theory of Operation ...................................................................... 21 
Control Architecture.................................................................. 21 
Undervoltage Lockout (UVLO) ............................................... 21 
Enable/Disable Control ............................................................. 21 
Soft Start ...................................................................................... 21 
Power Good................................................................................. 22 
Pulse Skip Mode ......................................................................... 22 
Hiccup Mode Current Limit ..................................................... 23 
Thermal Overload Protection................................................... 23 
REVISION HISTORY
7/09—Revision 0: Initial Version
Maximum Duty Cycle Operation ............................................ 23 
Synchronization.......................................................................... 23 
Converter Configuration............................................................... 24 
Selecting the Output Voltage .................................................... 24 
Setting the Oscillator Frequency .............................................. 25 
Synchronization and CLKOUT................................................ 25 
Operation Mode Configuration ............................................... 26 
External Components Selection ................................................... 27 
Input Capacitor Selection.......................................................... 27 
VDD RC Filter ............................................................................ 27 
Inductor Selection ...................................................................... 27 
Output Capacitor Selection....................................................... 28 
Control Loop Compensation.................................................... 28 
Design Example .............................................................................. 30 
Channel 1 Configuration and Components Selection .......... 30 
Channel 2 Configuration and Components Selection .......... 31 
System Configuration ................................................................ 32 
Application Circuits ....................................................................... 33 
Power Dissipation, Thermal Considerations.............................. 35 
Circuit Board Layout Recommendations ................................... 36 
Outline Dimensions ....................................................................... 37 
Ordering Guide .......................................................................... 37 
Rev. 0 | Page 2 of 40


Part Number ADP2114
Description Synchronous Step-Down DC-to-DC Regulator
Maker Analog Devices
Total Page 30 Pages
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