DC-DC Converter. ADP2102 Datasheet

ADP2102 Converter. Datasheet pdf. Equivalent

ADP2102 Datasheet
Recommendation ADP2102 Datasheet
Part ADP2102
Description Synchronous Step-Down DC-DC Converter
Feature ADP2102; Data Sheet Low Duty Cycle, 600 mA, 3 MHz, Synchronous Step-Down DC-to-DC Converter ADP2102 FEATURE.
Manufacture Analog Devices
Datasheet
Download ADP2102 Datasheet





Analog Devices ADP2102
Data Sheet
Low Duty Cycle, 600 mA, 3 MHz, Synchronous
Step-Down DC-to-DC Converter
ADP2102
FEATURES
Input voltage range: 2.7 V to 5.5 V
600 mA maximum load current
95% efficiency
Low duty cycle operation
Only 3 tiny external ceramic components
3 MHz typical operating frequency
Fixed output voltage of 1.2 V or 1.375 V
Adjustable output voltage up to 3.3 V
0.01 µA shutdown supply current
Automatic power save mode
Internal synchronous rectifier
Internal soft start
Internal compensation
Enable/shutdown logic input
Undervoltage lockout
Current limit protection
Thermal shutdown
Small 8-lead, 3 mm × 3 mm LFCSP
APPLICATIONS
USB powered devices
WLAN and gateways
Point of loads
Processor core power from 5 V
Digital cameras
PDAs and palmtop computers
Portable media players, GPS
GENERAL DESCRIPTION
The ADP2102 is a synchronous step-down dc-to-dc converter
that converts a 2.7 V to 5.5 V unregulated input voltage to a lower
regulated output voltage with up to 95% efficiency and 1%
accuracy. The low duty cycle capability of the ADP2102 is ideal for
USB applications or 5 V systems that power up submicron subvolt
processor cores. Its 3 MHz typical operating frequency and excel-
lent transient response allow the use of small, low cost 1 µH
inductors and 2.2 µF ceramic capacitors. At medium-to-high
load currents, it uses a current mode, pseudofixed frequency pulse-
width modulation to extend battery life. To ensure the longest
battery life in portable applications, the ADP2102 has a power save
mode (PSM) that reduces the switching frequency under light
load conditions to significantly reduce quiescent current.
TYPICAL APPLICATION CIRCUIT
INPUT VOLTAGE
2.7V TO 5.5V
CIN
2.2µF
FORCED
CCM
DCM/
CCM
VIN
LX
ADP2102
MODE
EN
FB/OUT
GND
ON
OFF
OUTPUT VOLTAGE
L 1.2V OR 1.375V
1µH
COUT
2.2µF
Figure 1.
The ADP2102 is available in both fixed and adjustable output
voltage options with a 600 mA maximum output current. The fixed
output voltage options are 1.2 V and 1.375 V. The adjustable output
voltage options are available from 1.5 V to 3.3 V. The ADP2102
requires only three external components and consumes 0.01 µA
in shutdown mode.
The ADP2102 is available in an 8-lead LFCSP and is specified
for the −40°C to +85°C temperature range.
100
95
VIN = 2.7V
VOUT = 1.375V
TA = 25°C
VIN = 3V
90
85
VIN = 4.2V
VIN = 3.6V
80
75
70
65
60
10
100
LOAD CURRENT (mA)
1000
Figure 2. Efficiency vs. Load Current at VOUT = 1.375 V
Rev. C
Document Feedback
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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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2007–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com



Analog Devices ADP2102
ADP2102
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Typical Application Circuit ............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
Thermal Resistance ...................................................................... 4
Boundary Condition .................................................................... 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
Typical Performance Characteristics ............................................. 6
Theory of Operation ...................................................................... 13
Control Scheme .......................................................................... 13
Constant On-Time Timer ......................................................... 13
Forced Continuous Conduction Mode ................................... 13
Power Save Mode........................................................................ 13
Synchronous Rectification ........................................................ 14
Current Limit .............................................................................. 14
REVISION HISTORY
7/2016—Rev. B to Rev. C
Changed ADP2102-ADJ to ADP2102 Adjustable Output
Voltage Options, ADP2102-FXD to ADP2102 Fixed Output
Voltage Options, ADP2102-xx to ADP2102 Fixed Output
Voltage Options, and CP-8-2 to CP-8-13 ................... Throughout
Moved Figure 1; Renumbered Sequentially .................................. 1
Changes to Features Section, General Description Section, and
Figure 1 .............................................................................................. 1
Added Figure 2 Caption................................................................... 1
Changes to Table 1............................................................................ 3
Changes to Figure 3 and Table 4..................................................... 5
Changes to Figure 47 and Figure 48............................................. 17
Changes to Figure 49 and Figure 50............................................. 18
Changes to Table 7.......................................................................... 19
Updated Outline Dimensions ....................................................... 24
Changes to Ordering Guide .......................................................... 24
Data Sheet
Soft Start ...................................................................................... 15
Enable........................................................................................... 15
Undervoltage Lockout ............................................................... 15
Thermal Shutdown .................................................................... 15
Applications Information .............................................................. 16
Inductor Selection ...................................................................... 16
Input Capacitor Selection.......................................................... 16
Output Capacitor Selection....................................................... 16
Typical Application Circuits ..................................................... 17
Setting the Output Voltage........................................................ 19
Efficiency Considerations ......................................................... 19
Thermal Considerations............................................................ 20
Design Example .......................................................................... 20
Circuit Board Layout Recommendations ................................... 22
Recommended Layout............................................................... 22
Outline Dimensions ....................................................................... 24
Ordering Guide .......................................................................... 24
9/2007—Rev. A to Rev. B
Changes to Features Section, Applications Section, and General
Description Section...........................................................................1
Changes to Table 4.............................................................................5
Changes to Table 6.......................................................................... 17
Changes to Table 7.......................................................................... 19
Changes to Circuit Board Layout Recommendations Section...... 21
Updated Outline Dimensions ....................................................... 23
Changes to Ordering Guide .......................................................... 23
6/2007—Rev. 0 to Rev. A
Changes to Ordering Guide .......................................................... 23
6/2007—Revision 0: Initial Version
Rev. C | Page 2 of 24



Analog Devices ADP2102
Data Sheet
ADP2102
SPECIFICATIONS
VIN = 3.6 V, EN = VIN, MODE = VIN, TA = 25°C, unless otherwise noted. Bold values indicate −40°C ≤ TA ≤ +85°C.1
Table 1.
Parameter
INPUT CHARACTERISTICS
Input Voltage Range2
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
OUTPUT CHARACTERISTICS
Output Voltage Range
Output Voltage Range
Output Voltage Initial Accuracy
Load Regulation
Line Regulation
FEEDBACK CHARACTERISTICS
FB Regulation Voltage
FB Bias Current
FB Impedance
CURRENT CHARACTERISTICS
Operating Current
Shutdown Current
Output Current
LX (SWITCH NODE) CHARACTERISTICS
LX On Resistance
LX Leakage Current
LX Minimum Off Time
LX On Time
Valley Current Limit
ENABLE, MODE CHARACTERISTICS
EN, MODE Input High Threshold
EN, MODE Input Low Threshold
EN, MODE Input Leakage Current
SOFT START PERIOD
THERMAL CHARACTERISTICS
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Test Conditions/Comments
VIN rising
ADP2102 fixed output voltage options
ADP2102 adjustable output voltage options
ADP2102 fixed output voltage options, TA= 25°C, ILOAD = 0 mA
ADP2102 fixed output voltage options, −40°C ≤TA ≤ 85°C,
ILOAD = 0 mA
VOUT = 1.2 V to 1.375 V, ILOAD = 0 mA to 600 mA
VIN = 2.7 V to 5.5 V, ILOAD = 10 mA
ADP2102 adjustable output voltage options
ADP2102 adjustable output voltage options
ADP2102 fixed output voltage options
ADP2102 PSM mode, ILOAD = 0 mA
EN = 0 V
ADP2102, VIN = 2.7 V to 5.5 V
P-channel switch, ILX = 100 mA
N-channel synchronous rectifier, ILX = 100 mA
VIN = 5.5 V, VLX = 0 V, 5.5 V
ADP2102 fixed output voltage options, ADP2102 adjustable output
voltage options
1.2 V fixed output voltage
1.375 V fixed output voltage
ADP2102-3, VOUT = 1.5 V
ADP2102-3, VOUT = 1.875 V
ADP2102-4, VOUT = 3.3 V (VIN = 5 V)
VIN = 5.5 V, EN = MODE = 0 V, 5.5 V
Min Typ Max Unit
2.7
5.5 V
2.2 2.4 2.5 V
220
mV
1.2
1.375 V
1.5
3.3 V
−1
+1 %
−2
+2 %
0.5
%
0.3
%
784 800 816 mV
50 nA
375
70 99 μA
0.01 1
μA
600 mA
325 600
200 400
1
μA
100
ns
100 131 160 ns
135 165 195 ns
155 177 210 ns
200 226 275 ns
198 238 270 ns
1
A
1.3
V
0.4 V
1
μA
250 500 800 μs
150
°C
15
°C
1 All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC).
2 The input voltage (VIN) range over which the rest of the specifications are valid. The device operates as expected until VIN goes below the UVLO threshold.
Rev. C | Page 3 of 24





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