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ADP2116 Datasheet

Step-Down DC-to-DC Regulator

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ADP2116 pdf
Configurable, Dual 3 A/Single 6 A,
Synchronous, Step-Down DC-to-DC Regulator
ADP2116
FEATURES
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%
Input voltage, VIN: 2.75 V to 5.5 V
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)
Independent enable inputs and power-good outputs
Overcurrent and thermal overload protection
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
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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.
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 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
TYPICAL APPLICATION CIRCUIT
VIN = 5V
100k
PGOOD2
VOUT2 = 1.2V, 3A
47µF 100µF
22µF
2.2µH
SYNC
4.7k
30k10nF
820pF
10
1µF
EN2 EN1
VIN4
VIN1
VIN5
VIN2
VIN6
VIN3
PGOOD2
PGOOD1
SW1
SW3 ADP2116 SW2
SW4
PGND1
PGND3
PGND2
PGND4
FB1
FB2
V2SET
V1SET
SYNC/CLKOUT COMP1
COMP2
SS1
SS2
100k
22µF
3.3µH
PGOOD1
VOUT1 = 2.5V, 3A
47µF 22µF
27k
10nF 30k
820pF
8.2k
fSW = 600kHz
Figure 1.
100
VIN = 5.0V; VOUT = 2.5V
95 VIN = 5.0V; VOUT = 3.3V
90
85
80
75
70 VIN = 3.3V; VOUT = 1.2V
65
60
10
100 1k
LOAD CURRENT (mA)
fSW = 600kHz
10k
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 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.
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.
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

ADP2116 Datasheet

Step-Down DC-to-DC Regulator

No Preview Available !

ADP2116 pdf
ADP2116
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 
Line and Load Regulation ........................................................... 9 
Supply Current............................................................................ 13 
Load Transient Response........................................................... 14 
Basic Functionality ..................................................................... 15 
Bode Plots.................................................................................... 18 
Simplified Block Diagram ............................................................. 19 
Theory of Operation ...................................................................... 20 
Control Architecture.................................................................. 20 
Undervoltage Lockout (UVLO) ............................................... 20 
Enable/Disable Control ............................................................. 20 
Soft Start ...................................................................................... 20 
Power Good................................................................................. 21 
Pulse Skip Mode ......................................................................... 21 
wwwH.DiactcauSphMeeot4dUe.cCoumrrent Limit ..................................................... 22 
REVISION HISTORY
10/09—Revision 0: Initial Version
Thermal Overload Protection .................................................. 22 
Maximum Duty Cycle Operation ............................................ 22 
Synchronization.......................................................................... 22 
Converter Configuration............................................................... 23 
Selecting the Output Voltage .................................................... 23 
Setting the Oscillator Frequency .............................................. 24 
Synchronization and CLKOUT................................................ 24 
Operation Mode Configuration ............................................... 25 
External Components Selection ................................................... 26 
Input Capacitor Selection.......................................................... 26 
VDD RC Filter ............................................................................ 26 
Inductor Selection ...................................................................... 26 
Output Capacitor Selection....................................................... 27 
Control Loop Compensation.................................................... 28 
Design Example .............................................................................. 29 
Channel 1 Configuration and Components Selection .......... 29 
Channel 2 Configuration and Components Selection .......... 30 
System Configuration ................................................................ 31 
Application Circuits ....................................................................... 32 
Power Dissipation and Thermal Considerations ....................... 34 
Circuit Board Layout Recommendations ................................... 35 
Outline Dimensions ....................................................................... 36 
Ordering Guide .......................................................................... 36 
Rev. 0 | Page 2 of 36


Part Number ADP2116
Description Step-Down DC-to-DC Regulator
Maker Analog Devices
Total Page 30 Pages
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