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ADP2121 Datasheet

Synchronous Step-Down DC-to-DC Converter

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ADP2121 pdf
FEATURES
Peak efficiency: 92%
Operating frequency: 6 MHz
Typical quiescent current in auto mode: 36 µA
Fixed output voltage: 1.8 V, 1.82 V, 1.85 V, 1.875 V, 2.3 V
Maximum guaranteed load current: 600 mA at VIN = 2.7 V to 5.5 V
Input voltage: 2.3 V to 5.5 V
Typical shutdown supply current: 0.3 µA
Automatic power-saving mode
Compatible with tiny multilayer inductors
Internal synchronous rectifier
Internal compensation
Internal soft start
Output to ground short-circuit protection
Cycle-by-cycle current-limit protection
Enable/shutdown logic input
Undervoltage lockout
Thermal shutdown protection
Ultrasmall 6-ball, 0.4 mm pitch, 1.17 mm2 WLCSP
APPLICATIONS
Mobile phones
Digital cameras
Digital audio
Portable equipment
GENERAL DESCRIPTION
The ADP2121 is a high frequency, low quiescent current
step-down dc-to-dc converter optimized for portable applications
in which board area and battery life are critical constraints. The
6 MHz operating frequency enables the use of tiny ceramic induc-
tors and capacitors. Additionally, the synchronous rectification
improves efficiency and results in fewer external components.
At high load currents, the device uses a voltage regulating pulse-
width modulation (PWM) mode that maintains a constant
frequency with excellent stability and transient response. In forced
PWM mode, the converter continues operating in PWM for light
loads. At light load conditions in auto mode, the ADP2121 can
automatically enter a power-saving mode that uses pulse-frequency
modulation (PFM) to reduce the effective switching frequency and
ensure the longest battery life in portable applications. During logic
controlled shutdown (EN ≤ 0.4 V), the input is disconnected
from the output and draws less than 0.3 μA current (typical)
from the source.
600 mA, 6 MHz, Synchronous
Step-Down DC-to-DC Converter
ADP2121
TYPICAL APPLICATION CIRCUIT
INPUT VOLTAGE*
2.3V TO 5.5V
CIN
2.2µF
ADP2121
A2 VIN
SW B1
OUTPUT VOLTAGE
L 1.8V, 1.82V, 1.85V, 1.875V, 2.3V
0.47µH
C2 GND
EN
B2
FB C1
MODE
A1
COUT
4.7µF
ON PWM
OFF AUTO
*FOR OUTPUT VOLTAGE = 2.3 V, INPUT VOLTAGE = 2.9 V TO 5.5V.
Figure 1.
TYPICAL PERFORMANCE
95
AUTO MODE
VIN = 2.7 V
(VIN = 2.9V FOR VOUT = 2.3V)
85
75
65
VOUT = 1.8V
VOUT = 1.82V
VOUT = 1.85V
VOUT = 1.875V
VOUT = 2.3V
55
0.1 1 10 100 1000
LOAD CURRENT (mA)
Figure 2. Efficiency vs. Load Current for Each Voltage Option
The ADP2121 has an input voltage range of 2.3 V to 5.5 V (2.9 V
to 5.5 V for VOUT = 2.3 V), allowing the use of a single Li+/Li−
polymer cell, 3-cell alkaline or Ni-MH cell, and other standard
power sources. The converter can source up to 600 mA and is
internally compensated to minimize external components. Other
key features, such as cycle-by-cycle peak current limit, soft start,
undervoltage lockout (UVLO), output-to-ground short-circuit
protection, and thermal shutdown, protect the internal and
external circuit components.
Table 1. Output Voltage Options
Input Voltage
Range (V)
Typical Start-Up
Time (μs)
2.3 to 5.5
75
2.3 to 5.5
275
2.9 to 5.5
100
Fixed Output
Voltage (V)
1.8, 1.85, 1.875
1.82
2.3
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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 ©2009–2011 Analog Devices, Inc. All rights reserved.
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Analog Devices Semiconductor Electronic Components Datasheet

ADP2121 Datasheet

Synchronous Step-Down DC-to-DC Converter

No Preview Available !

ADP2121 pdf
ADP2121
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Typical Application Circuit ............................................................. 1
Typical Performance......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
Thermal Data ................................................................................ 4
Thermal Resistance ...................................................................... 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
Typical Performance Characteristics ............................................. 6
REVISION HISTORY
1/11—Rev. A to Rev. B
Changes to Table 2 Summary.......................................................... 3
Changes to Undervoltage Lockout Threshold Parameter and
Output Voltage Accuracy Parameter in Table 2 ........................... 3
6/10—Rev. 0 to Rev. A
Changes to Features, General Description, Figure 1, and
Figure 2; Added Table 1; Renumbered Sequentially................ 1
Changes to Table 2............................................................................ 3
Changes to Table 3............................................................................ 4
Change to Typical Performance Characteristics Condition
Statement; Reorganized Typical Performance Characteristics
Section; Changes to Figure 4, Figure 6, Figure 7, and Figure 9;
Added Figure 5 and Figure 8; Renumbered Sequentially ....... 6
Changes to Figure 10 to Figure 12; Added Figure 13 to Figure 15... 7
Theory of Operation ...................................................................... 14
Overview ..................................................................................... 14
Mode Selection ........................................................................... 14
Enable/Shutdown ....................................................................... 15
Internal Control Features .......................................................... 15
Applications Information .............................................................. 17
Inductor Selection ...................................................................... 17
Input Capacitor Selection.......................................................... 17
Output Capacitor Selection....................................................... 17
PCB Layout Guidelines.................................................................. 19
Outline Dimensions ....................................................................... 20
Ordering Guide .......................................................................... 20
Changes to Figure 16, Figure 17, Figure 19, and Figure 20..........8
Changes to Figure 22; Added Figure 23 and Figure 24 ................9
Added Figure 40, Figure 42, Figure 43, and Figure 45 .............. 12
Added Figure 46 and Figure 48; Changes to Figure 47 ............. 13
Changes to Figure 51 and the Overview Section ....................... 14
Changes to the Auto Mode (PFM and PWM Switching) Section,
Figure 53, the Mode Transition Section, and the Enable/
Shutdown Section....................................................................... 15
Changes to the Output Short-Circuit Protection Section and
Figure 55 ...................................................................................... 16
Changes to the Output Capacitor Selection Section ................. 17
Changes to Table 6, Table 7, and Table 8 ..................................... 18
Changes to Ordering Guide .......................................................... 20
4/09—Revision 0: Initial Version
Rev. B | Page 2 of 20
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Part Number ADP2121
Description Synchronous Step-Down DC-to-DC Converter
Maker Analog Devices
Total Page 20 Pages
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