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MAX8815A

更新时间： 2023-12-20 18:46:14
品牌 Logo 应用领域
亚德诺 - ADI 升压转换器
页数 文件大小 规格书
15页 328K
描述
1A、97%效率、30μA静态电流、升压转换器，具有真关断

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MAX8815A 数据手册

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19-4092; Rev 1; 8/08  
EVALUATION KIT  
AVAILABLE  
1A, 97% Efficiency, 30µA Quiescent Current  
Step-Up Converter with True Shutdown  
MX815A  
General Description  
Features  
The MAX8815A DC-DC step-up converter is a high-effi-  
ciency, low quiescent current, synchronous step-up  
converter with True Shutdown™ and inrush-current lim-  
iting. The MAX8815A generates any output voltage  
from 3.3V to 5V from a 2-cell NiMH/NiCd or a single-cell  
Li+/Li polymer battery.  
♦ Up to 97% Efficiency with Internal Synchronous  
Rectifier  
♦ Low 30µA Quiescent Current  
♦ Guaranteed 500mA Output Current at V  
= 5V  
OUT  
from 1.8V Input  
♦ Guaranteed 1A Output Current at 5V from 2.5V  
The MAX8815A uses two modes of operation. The first  
mode of operation (normal) uses only 30µA (typ) quies-  
cent current and allows the converter to switch only  
when needed at no load and light loads. Under moder-  
ate and heavy loads (typically above 90mA), the  
MAX8815A uses a fixed-frequency pulse-width modula-  
tion (PWM) technique. This mode allows maximum effi-  
ciency at light loads. The second mode of operation is  
a fixed-frequency forced-pulse-width modulation  
(FPWM) mode where the converter switches at a fixed  
frequency irrespective of the load. This mode allows for  
easy noise filtering and lower output ripple.  
Input  
♦ Low-Noise Constant Frequency Operation (FPWM  
Mode)  
♦ 2MHz PWM Switching Frequency  
♦ Preset (5V) or Adjustable Output  
♦ Controlled Current in Soft-Start Limits Inrush  
Current  
♦ True Shutdown  
♦ Internal Compensation  
♦ Overload/Short-Circuit Protection  
♦ 0.1µA Shutdown Current  
♦ Thermal Shutdown  
The MAX8815A has a preset 2.5A current limit, allowing  
500mA load at 1.8V input and 1A load at 2.5V input when  
the output is set to 5V. Features include soft-start, which  
limits inrush current during startup, True Shutdown, and  
internal compensation. The MAX8815A is available in a  
compact 10-pin, 3mm x 3mm TDFN package.  
♦ Compact 10-Pin, 3mm x 3mm TDFN Package  
The MAX8815A evaluation kit can help shorten the time  
required for system design.  
Ordering Information  
PART  
PIN-PACKAGE  
TOP MARK  
Applications  
MAX8815AETB+  
10 TDFN-EP*  
AUH  
+Denotes a lead-free/RoHS-compliant package.  
*EP = Exposed pad.  
DSC and DVC  
Microprocessor/DSP Core Power  
Cell Phones, PDAs, MP3 Players  
Portable Handheld Devices  
Note: This device operates in the -40°C to +85°C extended  
operating temperature range.  
PCMCIA Cards  
Simplified Operating Circuit  
True Shutdown is a trademark of Maxim Integrated Products, Inc.  
Pin Configuration  
INPUT VOLTAGE  
1.2V TO 5.5V  
TOP VIEW  
BATT  
ON  
LX  
OUTPUT VOLTAGE  
5V UP TO 1A  
9
8
7
10  
6
POUT  
MAX8815A  
OUTS  
FB  
MAX8815A  
+
SKIPB  
GND  
1
2
3
5
4
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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