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ADP2121 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 ADP2121
기능 Synchronous Step-Down DC-to-DC Converter
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ADP2121 데이터시트, 핀배열, 회로
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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ADP2121 pdf, 반도체, 판매, 대치품
ADP2121
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
VIN to GND
EN, MODE to GND
FB, SW to GND
Operating Ambient Temperature Range
(ILOAD ≤ 600 mA)
Operating Junction Temperature Range
Storage Temperature
Soldering Conditions
ESD (Electrostatic Discharge)
Human Body Model
Rating
−0.3 V to +6 V
−0.3 V to VIN
−0.3 V to VIN + 0.2 V
–40°C to +85°C
–40°C to + 125°C
–45°C to +150°C
JEDEC J-STD-020
±4 kV
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
THERMAL DATA
Absolute maximum ratings apply individually only, not in
combination. The ADP2121 can be damaged when the junction
temperature limits are exceeded. Monitoring ambient tempera-
ture does not guarantee that the junction temperature (TJ) is
within the specified temperature limits. In applications with
high power dissipation and poor PCB thermal resistance, the
maximum ambient temperature may need to be derated. In
applications with moderate power dissipation and low PCB
thermal resistance, the maximum ambient temperature can
exceed the maximum limit as long as the junction temperature
is within specification limits.
The junction temperature (TJ) of the device is dependent on the
ambient temperature (TA), the power dissipation of the device
(PD), and the junction-to-ambient thermal resistance of the
package (θJA). Maximum junction temperature (TJ) is calculated
from the ambient temperature (TA) and power dissipation (PD)
using the following formula:
TJ = TA + (PD × θJA)
The junction-to-ambient thermal resistance (θJA) of the package
is based on modeling and calculation using a 2- and 4-layer
board. The junction-to-ambient thermal resistance is highly
dependent on the application and board layout. In applications
where high maximum power dissipation exists, close attention
to thermal board design is required.
The value of θJA may vary, depending on PCB material, layout,
and environmental conditions. Refer to JEDEC JESD51-9 for
detailed information about board construction.
THERMAL RESISTANCE
The junction-to-ambient thermal resistance of the system (θJA)
is specified for worst-case conditions, that is, a device soldered
in a circuit board for surface-mount packages.
Table 4.
Package Type
6-Ball WLCSP
2-Layer Board
4-Layer Board
θJA Unit
198 °C/W
105 °C/W
ESD CAUTION
Rev. B | Page 4 of 20
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ADP2121 전자부품, 판매, 대치품
44
VOUT = 1.82V
42
40
TA = +85°C
38
TA = +25°C
36
34
TA = –40°C
32
30
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
INPUT VOLTAGE (V)
Figure 10. Auto Mode Quiescent Current vs. Input Voltage Over Temperature
(Nonswitching, No Load)
0.8
VOUT = 1.82V
0.7
0.6
0.5 TA = +85°C
0.4
TA = +25°C
0.3
0.2 TA = –40°C
0.1
0
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
INPUT VOLTAGE (V)
Figure 11. Shutdown Current vs. Input Voltage Over Temperature
16
VOUT = 1.82V
14
12
TA = +85°C
TA = +25°C
10 TA = –40°C
8
6
VOUT = 1.82V
4
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
INPUT VOLTAGE (V)
Figure 12. PWM Mode Quiescent Current vs. Input Voltage Over Temperature
(Switching, No Load)
ADP2121
40
38
36
34
32 VOUT = 1.8V
VOUT = 1.82V
VOUT = 1.85V
VOUT = 1.875V
VOUT = 2.3V
30
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
INPUT VOLTAGE (V)
Figure 13. Auto Mode Quiescent Current vs. Input Voltage for All Voltage
Options (Nonswitching, No Load)
0.7
0.6
0.5
0.4
0.3
0.2
VOUT = 1.8V
VOUT = 1.82V
0.1 VOUT = 1.85V
VOUT = 1.875V
VOUT = 2.3V
0
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
INPUT VOLTAGE (V)
Figure 14. Shutdown Current vs. Input Voltage for All Voltage Options
15
13
11
9
7
VOUT = 1.8V
5
VOUT = 1.82V
VOUT = 1.85V
VOUT = 1.875V
VOUT = 2.3V
3
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
INPUT VOLTAGE (V)
Figure 15. PWM Mode Quiescent Current vs. Input Voltage
for All Voltage Options (Switching, No Load)
Rev. B | Page 7 of 20
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