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MAX669

更新时间： 2024-11-07 14:57:31
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
18页 2057K
描述
1.8V至28V输入、PWM升压型控制器，μMAX封装

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MAX669 数据手册

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MAX668/MAX669  
1.8V to 28V Input, PWM Step-Up  
Controllers in μMAX  
General Description  
Benefits and Features  
The MAX668/MAX669 constant-frequency, pulse-width-  
modulating (PWM), current-mode DC-DC controllers are  
designed for a wide range of DC-DC conversion applications  
including step-up, SEPIC, flyback, and isolated-output  
configurations. Power levels of 20W or more can be  
controlled with conversion efficiencies of over 90%. The  
1.8V to 28V input voltage range supports a wide range of  
battery and AC-powered inputs. An advanced BiCMOS  
design features low operating current (220μA), adjustable  
operating frequency (100kHz to 500kHz), soft-start, and  
a SYNC input allowing the MAX668/MAX669 oscillator to  
be locked to an external clock.  
● 1.8V Minimum Start-Up Voltage (MAX669)  
● Wide Input Voltage Range (1.8V to 28V)  
● Tiny 10-Pin μMAX Package  
● Current-Mode PWM and Idle Mode™ Operation  
● Efficiency over 90%  
● Adjustable 100kHz to 500kHz Oscillator or  
SYNC Input  
● 220μA Quiescent Current  
● Logic-Level Shutdown  
● Soft-Start  
DC-DC conversion efficiency is optimized with a low  
100mV current-sense voltage as well as with Maxim’s  
proprietary Idle Mode™ control scheme. The controller  
operates in PWM mode at medium and heavy loads for  
lowest noise and optimum efficiency, then pulses only as  
needed (with reduced inductor current) to reduce operating  
current and maximize efficiency under light loads. A logic-  
level shutdown input is also included, reducing supply  
current to 3.5μA.  
Applications  
● Cellular Telephones  
● Telecom Hardware  
● LANs and Network Systems  
● POS Systems  
Ordering Information  
PART  
TEMP RANGE  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
10 µMAX  
MAX668EUB  
MAX669EUB  
MAX669EUB/V+T  
The MAX669, optimized for low input voltages with a  
guaranteed start-up voltage of 1.8V, requires bootstrapped  
operation (IC powered from boosted output). It supports  
output voltages up to 28V. The MAX668 operates with  
inputs as low as 3V and can be connected in either a boot-  
strapped or non-bootstrapped (IC powered from input sup-  
ply or other source) configuration. When not bootstrapped,  
it has no restriction on output voltage. Both ICs are avail-  
able in an extremely compact 10-pin μMAX package.  
10 µMAX  
10 µMAX  
Idle Mode is a trademark of Maxim Integrated Products.  
+ Denotes a lead(Pb)-free/RoHS-compliant package.  
T = Tape and reel.  
/V Denotes an automotive qualified part.  
Note: Devices are also available in a lead(Pb)-free/RoHS-  
compliant package. Specify lead-free by adding “+” to the part  
number when ordering.  
Typical Operating Circuit  
Pin Configuration  
V
= 1.8V to 28V  
IN  
TOP VIEW  
V
OUT  
= 28V  
V
CC  
SYNC/  
SHDN  
EXT  
CS+  
LDO  
FREQ  
GND  
REF  
1
2
3
4
5
10 SYNC/SHDN  
FREQ  
9
8
7
6
V
CC  
MAX668  
MAX669  
MAX669  
EXT  
PGND  
CS+  
PGND  
FB  
LDO  
REF  
FB  
µMAX  
GND  
19-4778; Rev 3; 6/16  
1234567...18

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