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| 型号： | ADP2121-1.85-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION 1.85V ADP2121 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.85V |
| 电流 - 输出： | 600mA |
| 输入电压： | 2.3 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 6MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP2121 |
600 mA, 6 MHz, Synchronous
Step-Down DC-to-DC Converter
ADP2121
FEATURES
TYPICAL APPLICATION CIRCUIT
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 V IN = 2.7 V to 5.5 V
Input voltage: 2.3 V to 5.5 V
INPUT VOLTAGE*
2.3V TO 5.5V
C IN
2.2μF
A2
C2
ADP2121
VIN SW B1
GND FB C1
EN MODE
B2 A1
OUTPUT VOLTAGE
L 1.8V, 1.82V, 1.85V, 1.875V, 2.3V
0.47μH
C OUT
4.7μF
Typical shutdown supply current: 0.3 μA
Automatic power-saving mode
OFF
ON
AUTO
PWM
Compatible with tiny multilayer inductors
Internal synchronous rectifier
Internal compensation
Internal soft start
*FOR OUTPUT VOLTAGE = 2.3 V, INPUT VOLTAGE = 2.9 V TO 5.5V.
Figure 1.
TYPICAL PERFORMANCE
Output to ground short-circuit protection
95
AUTO MODE
Cycle-by-cycle current-limit protection
Enable/shutdown logic input
Undervoltage lockout
Thermal shutdown protection
Ultrasmall 6-ball, 0.4 mm pitch, 1.17 mm 2 WLCSP
APPLICATIONS
Mobile phones
85
75
V IN = 2.7 V
(V IN = 2.9V FOR V OUT = 2.3V)
Digital cameras
Digital audio
Portable equipment
65
55
V OUT = 1.8V
V OUT = 1.82V
V OUT = 1.85V
V OUT = 1.875V
V OUT = 2.3V
0.1
1
10
100
1000
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
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 V OUT = 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.
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.
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
Table 1. Output Voltage Options
Input Voltage Typical Start-Up
Range (V) 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
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 www.analog.com
Fax: 781.461.3113 ?2009–2011 Analog Devices, Inc. All rights reserved.
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