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MAX857CUA IC产品库存

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MAX857CUA:100%全新原装现货,0.8-5v输入 3.3V/5V输出 125MA DC/DC 变换器
库存编号:
89316
产品型号:
MAX857CUA
厂商:
MAXIM
封装:
MSOP-8
库存数量:
25000
参考价:
3.53
起订量:
1
点击率:
1150
PDF搜索:
下载
立即订购:
MAX857CUA
联系电话:
0755-82516777

MAX857CUA 产品描述

100%全新原装现货,0.8-5v输入 3.3V/5V输出 125MA DC/DC 变换器

MAX857CUA 产品简介

OUTPUT
5V AT 100mA
OR
3.3V AT 125mA
--------------------------


3.3V/5V or Adjustable-Output, Step-Up DC-DC Converters
© 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
© 125mA and 500mA Switch-Current Limits Permit
Use of Low-Cost Inductors
© Up to 500kHz Switching Frequency
© ±1.5% Reference Tolerance Over Temperature
© Low-Battery Detector (LBI/LBO)
© 8-Pin SO and µMAX Packages

_______________General Description
The MAX856–MAX859 are high-efficiency, CMOS, stepup,
DC-DC switching regulators for small, low input voltage
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 quiescent
supply current is 25µA (1µA in shutdown).
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.
________________________Applications
3.3V to 5V Step-Up Conversion
Palmtop Computers
Portable Data-Collection Equipment
Personal Data Communicators/Computers
Medical Instrumentation
2-Cell & 3-Cell Battery-Operated Equipment
Glucose Meters

ABSOLUTE MAXIMUM RATINGS
Supply Voltage (OUT to GND) ...................................-0.3V, +7V
Switch Voltage (LX to GND) .......................................-0.3V, +7V
S—H—D—N–, LBO to GND ....................................................-0.3V, +7V
LBI, REF, 3/–5–, FB to GND .........................-0.3V, (VOUT + 0.3V)
Reference Current (IREF) ..................................................2.5mA
Continuous Power Dissipation (TA = +70°C)
SO (derate 5.88mW/°C above +70°C) .........................471mW
µMAX (derate 4.1mW/°C above +70°C) ......................330mW
CERDIP (derate 8.00mW/°C above +70°C) .................640mW

Reverse Battery Current (TA £ +45°C, Note 1) .................750mA
Operating Temperature Ranges
MAX85_C_ _ ......................................................0°C to +70°C
MAX85_E_ _ ....................................................-40°C to +85°C
MAX85_MJA .................................................-55°C to +125°C
Junction Temperature .....................................................+150°C
Storage Temperature Range ............................-65°C to +160°C
Lead Temperature (soldering, 10sec) ............................+300°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1: Reverse battery current is measured from the Typical Operating Circuit’sbattery input terminal to GND when the battery is
connected backwards. A reverse current of 750mA will not exceed the SO or CERDIP package dissipation limits but, if left
for an extended time (more than ten minutes), may degrade performance.

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