ADP2102-EVAL Analog Devices, ADP2102-EVAL Datasheet

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ADP2102-EVAL

Manufacturer Part Number
ADP2102-EVAL
Description
600mA 3MHz Synchronous Step-Down DC-DC Converter
Manufacturer
Analog Devices
Datasheet
Preliminary Technical Data
FEATURES
95% peak efficiency
Optimized for low output voltages
Optimized for extremely small ceramic inductors
Up to 600mA, load current
2.7 V to 5.5 V input voltage range
Operates with a Single Li-Ion battery
Fixed Output Voltage from 0.8V to 1.875V
Adjustable Output Voltage from 0.8V to 1.875V
Low 60μA quiescent current
Internal Synchronous rectifier
3 MHz Operating Frequency
0.1μA Shutdown Supply Current
Small 8-Lead 3 x3 LFCSP Package
Enable /shutdown logic input
Under Voltage Lockout
Internal Soft Start
Internal Compensation
APPLICATIONS
Wireless Handsets
Portable Media Players
PDA’s and Palmtop Computers
Digital Cameras
Smart Phones
Rev. PrA
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 registered trademarks are the property of their respective owners.
TYPICAL PERFORMANCE CHARACTERITICS
100
90
80
70
60
0
Vout= 1.375V L =2.2uH Cin= Cout = 10uF
100
Load Current ( mA)
200
ADP2102_Efficiency
300
Figure 1.
400
500
600
Vin= 2.7V
Vin=3.0V
Vin=3.6V
Vin=4.2V
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
GENERAL DESCRIPTION
The ADP2102 is a low quiescent current step-down DC-DC
converter optimized to regulate low output voltages in a
compact 3mmx3mm LFCSP package. At high load currents, the
ADP2102 uses a current mode, constant on time, pseudo fixed
frequency, valley current control scheme for excellent stability
and transient response with very few, small external
components. To ensure the longest battery life in portable
applications, the ADP2102 has a power saving mode that
reduces the switching frequency under light load conditions to
significantly reduce the quiescent current.
The ADP2102 runs from input voltages from 2.7V to 5.5V
allowing single Li+/Li- polymer cell, multiple Alkaline/Ni-MH
cells and other standard power sources. ADP2102 output
voltage is adjustable from 0.8V to 1.875V, while the suffix part
numbers ADP2102-XX indicate pre-set voltage ranges of 1.875,
1.8, 1.5, 1.375, 1.25, 1.2, 1.0 & 0.8V. All versions include an
internal power switch and a synchronous rectifier for high
efficiency while internal compensation guarantees minimal
number of external components. During logic-controlled
shutdown, the input is disconnected from the output and it
draws less than 0.1μA from the input source. Other key features
include under voltage lockout to prevent deep battery discharge
and soft start to prevent input current overshoot at startup.
Step-Down DC-DC Converter
600mA 3MHz Synchronous
TYPICAL APPLICATION CIRCUIT
©2007 Analog Devices, Inc. All rights reserved.
Figure 2.
ADP2102
www.analog.com

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ADP2102-EVAL Summary of contents

Page 1

... ADP2102 has a power saving mode that reduces the switching frequency under light load conditions to significantly reduce the quiescent current. The ADP2102 runs from input voltages from 2.7V to 5.5V allowing single Li+/Li- polymer cell, multiple Alkaline/Ni-MH cells and other standard power sources. ADP2102 output voltage is adjustable from 0 ...

Page 2

... This is the V input voltage range over which the rest of the specifications are valid. The part operates as expected until Conditions V rising IN ADP2102_Fixed Vout=0.8V -1.875V, Iload= 0-600mA Iout = 10mA ADP2102 0.9V FB EN=0V P-Channel Switch N-channel Synchronous Rectifier PV =5.5V 0V,5. P-Channel Switch or N-Channel Synchronous Rectifier EN=MODE ...

Page 3

... Application Note AN-772: A Design and Manufacturing Guide JEDEC J-STD-020 for the Lead Frame Chip Scale Package (LFCSP). BOUNDARY CONDITION Natural convection, 4-layer board, exposed pad soldered to the PCB. ), using the following JA ESD CAUTION Rev. PrA| Page ADP2102 1 θ Unit JA 54 °C ...

Page 4

... Mode Input. To set the ADP2102 to Forced Continuous Conduction Mode (CCM), drive MODE high. To set the ADP2102 to Power Saving Mode (PSM), drive MODE low Enable Input. Drive EN high to turn on the ADP2102. Drive EN low to turn it off and reduce the input current to 0.1μA. This pin cannot be left floating. 3 FB/OUT Output Sense Input or Feedback Input ...

Page 5

... Power Save Mode during light loads but the output voltage ripple is minimized. POWER SAVE MODE When the MODE pin is LOW, the ADP2102 operates in Power Save Mode. In this mode, at light load currents, the part automatically goes into reduced frequency operation where some pulses are skipped to increase efficiency while still remaining in regulation ...

Page 6

... Therefore, during this fault condition the ADP2102 acts as a constant current source at the current limit of 1A typical. SOFT START The ADP2102 has in internal soft start function that ramps the output voltage in a controlled manner upon startup by limiting the inrush current. This prevents possible input voltage drops when a battery or a high impedance power source is connected to the input of the converter ...

Page 7

... ORDERING GUIDE Model Temperature Range ADP2102 –40°C to +85°C ADP2102-EVAL ©2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. PR06631-0-2/07(PrA) Figure 4. 8 -Lead Lead Frame Chip Scale Package [LFCSP Body, Dimensions shown in millimeters ...

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