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ADP2121ACBZ-1.85R7 PDF预览

ADP2121ACBZ-1.85R7

更新时间： 2024-02-04 03:43:11
品牌 Logo 应用领域
亚德诺 - ADI 开关
页数 文件大小 规格书
21页 2380K
描述
600 mA, 6 MHz Synchronous Step-Down DC-to-DC Converter

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ADP2121ACBZ-1.85R7 技术参数

是否无铅： 含铅是否Rohs认证： 符合
生命周期：Obsolete零件包装代码：BGA
包装说明：VFBGA, BGA6,2X3,16针数：6
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.65
其他特性：ALSO HAS CONTROL TECHNIQUE OF PFM模拟集成电路 - 其他类型：SWITCHING REGULATOR
控制模式：VOLTAGE-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：5.5 V最小输入电压：2.3 V
标称输入电压：3.6 VJESD-30 代码：R-PBGA-B6
JESD-609代码：e3长度：1.3 mm
湿度敏感等级：1功能数量：1
端子数量：6最高工作温度：85 °C
最低工作温度：-40 °C最大输出电流：1.222 A
标称输出电压：1.85 V封装主体材料：PLASTIC/EPOXY
封装代码：VFBGA封装等效代码：BGA6,2X3,16
封装形状：RECTANGULAR封装形式：GRID ARRAY, VERY THIN PROFILE, FINE PITCH
峰值回流温度（摄氏度）：225认证状态：Not Qualified
座面最大高度：0.66 mm子类别：Switching Regulator or Controllers
表面贴装：YES切换器配置：BUCK
最大切换频率：6640 kHz温度等级：INDUSTRIAL
端子面层：Matte Tin (Sn)端子形式：BALL
端子节距：0.4 mm端子位置：BOTTOM
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：0.9 mm
Base Number Matches：1

ADP2121ACBZ-1.85R7 数据手册

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ADP2121  
Data Sheet  
THEORY OF OPERATION  
V
BAT  
2.3V TO 5.5V  
2.2µF  
X5R  
6.3V  
A2  
VIN  
PV  
IN  
FB  
AV  
IN  
V
C1  
OUT  
PDRIVE  
R1  
R2  
PWM  
COMP  
SW  
B1  
470nH  
EAMP  
SHOOT-  
THROUGH  
CONTROL  
V
OUT  
NDRIVE  
AGND  
4.7µF  
X5R  
6.3V  
BG  
COMPENSATION  
V(V  
)
PGND  
AGND  
IN  
RAMP  
GND  
C2  
PILIM  
AGND  
THERMAL  
SHUTDOWN  
PREF  
NREF  
6MHz  
OSCILLATOR  
SOFT START  
ZXCOMP  
LOGIC  
AND  
PWM/PFM  
CONTROL  
REF  
PFM  
COMPARATOR  
PFM  
BG  
V
IN  
PFM  
DETECT  
FB  
THRESHOLD  
DETECT  
BANDGAP  
THRESHOLD  
DETECT  
B2  
A1  
MODE  
EN  
ON  
PWM  
OFF  
AUTO  
Figure 51. Internal Block Diagram  
OVERVIEW  
MODE SELECTION  
The ADP2121 is a high efficiency, synchronous step-down  
dc-to-dc converter that provides up to 600 mA of continuous  
output current. It operates from a 2.3 V to 5.5 V input voltage  
for the 1.8 V, 1.82 V, 1.85 V, and 1.875 V (typical) fixed-output  
voltages, and from a 2.9 V to 5.5 V input voltage for the 2.3 V  
(typical) output voltage. The 6 MHz operating frequency  
enables the use of tiny external components. The internal  
control schemes of the ADP2121 give excellent stability and  
transient response. External control for mode selection and  
device enable provide power-saving options that are aided by  
internal features such as synchronous rectification and compen-  
sation. Other internal features, such as cycle-by-cycle peak current  
limit, soft start, undervoltage lockout, output-to-ground short-  
circuit protection, and thermal shutdown, protect the internal  
and external circuit components.  
The ADP2121 has two modes of operation (PWM mode and  
auto mode), determined by the state of the MODE pin.  
Pull the MODE pin high to force the converter to operate in  
PWM mode regardless of the output current. Otherwise, set  
MODE low to allow the converter to automatically enter the  
power-saving PFM mode at light load currents. Do not leave  
this pin floating. The MODE pin is not designed for dynamic  
control and must not be changed after the ADP2121 is enabled.  
Pulse-Width Modulation (PWM) Mode  
The PWM mode forces the part to maintain a fixed frequency  
of 6 MHz (typical) over all load conditions. The ADP2121 uses  
a hybrid proprietary voltage mode control scheme to control  
the duty cycle over load current and line voltage variation. This  
control provides excellent stability, transient response, and output  
regulation but results in lower efficiencies at light load currents.  
Rev. C | Page 14 of 20  
 
 
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