ADP2121 Datasheet PDF - Analog Devices
| Part Number | ADP2121 | |
| Description | Synchronous Step-Down DC-to-DC Converter | |
| Manufacturers | Analog Devices | |
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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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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADP2121
BALL A1
INDICATOR
12
MODE VIN
A
SW EN
B
FB GND
C
TOP VIEW
(BALL SIDE DOWN)
(BUMPS ON OPPOSITE SIDE)
Not to Scale
Figure 3. Pin Configuration
Table 5. Pin Function Descriptions
Pin No. Mnemonic Description
A1 MODE Mode Select. This pin toggles between auto mode (PFM and PWM switching) and PWM mode. Set MODE low to
allow the part to operate in auto mode. Pull MODE high to force the part to operate in PWM mode. The voltage
applied to MODE should never be higher than the voltage applied to VIN. Do not leave this pin floating.
B1 SW
Switch Node.
C1 FB
Feedback Divider Input. Connect the output capacitor from FB to GND as close as possible to the ADP2121 to set
the output voltage ripple and to complete the control loop.
A2 VIN
Power Supply Input. Connect the input capacitor from VIN to GND as close as possible to the ADP2121.
B2 EN
Enable. Pull this pin high to enable the part. Set this pin low to disable the part. Do not leave this pin floating.
C2 GND
Ground Pin.
Rev. B | Page 5 of 20
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| Information | Total 20 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ ADP2121.PDF Datasheet ] | |
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