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| 型號(hào)： | ADP2121ACBZ-1.85R7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.222 A SWITCHING REGULATOR, 6640 kHz SWITCHING FREQ-MAX, PBGA6 |
| 封裝： | 1.17 MM HEIGHT, 0.40 MM PITCH, ROHS COMPLIANT, WLCSP-6 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大?。?/td> | 1702K |
| 代理商： | ADP2121ACBZ-1.85R7 |
600 mA, 6 MHz, Synchronous
Step-Down DC-to-DC Converter
ADP2121
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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
Fax: 781.461.3113
2009–2011 Analog Devices, Inc. All rights reserved.
FEATURES
Peak efficiency: 92%
Operating frequency: 6 MHz
Typical quiescent current in auto mode: 36 A
Fixed output voltage: 1.8 V, 1.82 V, 1.85 V, 1.875 V, 2.3 V
Maximum guaranteed load current: 600 mA atV
IN = 2.7 V to 5.5 V
Input voltage: 2.3 V to 5.5 V
Typical shutdown supply current: 0.3 A
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.
TYPICAL APPLICATION CIRCUIT
VIN
07407-
001
GND
MODE
EN
FB
SW
CIN
2.2F
COUT
4.7F
ADP2121
L
0.47H
ON
OFF
PWM
AUTO
B2
C1
A2
C2
A1
B1
OUTPUT VOLTAGE
1.8V, 1.82V, 1.85V, 1.875V, 2.3V
INPUT VOLTAGE*
2.3V TO 5.5V
*FOR OUTPUT VOLTAGE = 2.3 V, INPUT VOLTAGE = 2.9 V TO 5.5V.
Figure 1.
TYPICAL PERFORMANCE
07407-
062
55
0.1
1
10
100
1000
65
75
85
95
LOAD CURRENT (mA)
VOUT = 1.8V
VOUT = 1.82V
VOUT = 1.85V
VOUT = 1.875V
VOUT = 2.3V
AUTO MODE
VIN = 2.7 V
(VIN = 2.9V FOR VOUT = 2.3V)
E
FFIC
IE
N
C
Y
(
%)
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)
Fixed Output
Voltage (V)
2.3 to 5.5
75
1.8, 1.85, 1.875
2.3 to 5.5
275
1.82
2.9 to 5.5
100
2.3
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| ADP2125ACDZ-1.26R7 | 制造商:Analog Devices 功能描述:NR26VOUT 6MHZ BUCK WITH XSHUT 制造商:Analog Devices 功能描述:1.26VOUT 6MHZ BUCK WITH XSHUT - Tape and Reel |
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