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MAX856

更新时间： 2024-10-02 14:57:19
品牌 Logo 应用领域
亚德诺 - ADI DC-DC转换器
页数 文件大小 规格书
12页 812K
描述
3.3V/5V或可调输出、升压型DC-DC转换器

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MAX856 数据手册

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19-0211; Rev 4; 5/96  
3.3V/5V or Adjustable-Output,  
Step-Up DC-DC Converters  
_______________General Description  
____________________________Features  
♦ 0.8V to 6.0V Input Supply Voltage  
♦ 0.8V Typ Start-Up Supply Voltage  
♦ 85% Efficiency at 100mA  
♦ 25µA Quiescent Current  
♦ 1µA Shutdown Mode  
The MAX856–MAX859 are high-efficiency, CMOS, step-  
up, DC-DC switching regulators for small, low input volt-  
age or battery-powered systems. The MAX856/MAX858  
accept a positive input voltage between 0.8V and VOUT  
and convert it to a higher, pin-selectable output voltage of  
3.3V or 5V. The MAX857/MAX859 adjustable versions  
accept 0.8V to 6.0V input voltages and generate higher  
adjustable output voltages in the 2.7V to 6.0V range.  
Typical efficiencies are greater than 85%. Typical quies-  
cent supply current is 25µA (1µA in shutdown).  
♦ 125mA and 500mA Switch-Current Limits Permit  
Use of Low-Cost Inductors  
♦ Up to 500kHz Switching Frequency  
♦
1.5% Reference Tolerance Over Temperature  
The MAX856–MAX859 combine ultra-low quiescent supply  
current and high efficiency to give maximum battery life. An  
internal MOSFET power transistor permits high switching  
frequencies. This benefit, combined with internally set peak  
inductor current limits, permits the use of small, low-cost  
inductors. The MAX856/MAX857 have a 500mA peak  
inductor current limit. The MAX858/MAX859 have a 125mA  
peak inductor current limit.  
♦ Low-Battery Detector (LBI/LBO)  
♦ 8-Pin SO and µMAX Packages  
______________Ordering Information  
PART  
TEMP. RANGE  
0°C to +70°C  
0°C to +70°C  
0°C to +70°C  
-40°C to +85°C  
-55°C to +125°C  
0°C to +70°C  
0°C to +70°C  
0°C to +70°C  
-40°C to +85°C  
-55°C to +125°C  
PIN-PACKAGE  
MAX856CSA  
MAX856CUA  
MAX856C/D  
MAX856ESA  
MAX856MJA  
MAX857CSA  
MAX857CUA  
MAX857C/D  
MAX857ESA  
MAX857MJA  
8 SO  
8 µMAX  
Dice*  
________________________Applications  
3.3V to 5V Step-Up Conversion  
Palmtop Computers  
8 SO  
†
8 CERDIP  
8 SO  
Portable Data-Collection Equipment  
Personal Data Communicators/Computers  
Medical Instrumentation  
2-Cell & 3-Cell Battery-Operated Equipment  
Glucose Meters  
8 µMAX  
Dice*  
8 SO  
†
8 CERDIP  
Ordering Information continued at end of data sheet.  
* Dice are tested at T = +25°C only.  
A
__________Typical Operating Circuit  
†
Contact factory for availability.  
INPUT  
__________________Pin Configuration  
0.8V TO V  
OUT  
TOP VIEW  
OUTPUT  
5V AT 100mA  
OR  
1
2
3
4
8
7
6
5
SHDN  
3/5  
LX  
47µH  
GND  
3.3V AT 125mA  
MAX856  
MAX858  
OUT  
LBI  
REF  
SHDN  
ON/OFF  
LX  
1N5817  
LBO  
68µF  
MAX856  
SO/µMAX  
3/5  
LBI  
OUT  
3V/5V SELECT  
LOW-BATTERY  
DETECTOR  
INPUT  
1
2
3
4
8
7
6
5
SHDN  
FB  
LX  
GND  
LOW-BATTERY  
DETECTOR OUTPUT  
MAX857  
MAX859  
REF  
LBO  
OUT  
LBI  
REF  
LBO  
GND  
SO/µMAX  
________________________________________________________________ Maxim Integrated Products  
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800  
1234567...12

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