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MAX669

更新时间： 2024-11-05 22:55:15
品牌 Logo 应用领域
美信 - MAXIM 控制器
页数 文件大小 规格书
18页 290K
描述
1.8V to 28V Input, PWM Step-Up Controllers in レMAX

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19-4778; Rev 0a; 8/98  
1.8V to 28V Input, PWM Step-Up  
Controllers in µMAX  
8/MAX69  
General Description  
Features  
♦ 1.8V Minimum Start-Up Voltage (MAX669)  
The MAX668/MAX669 constant-frequency, pulse-width-  
modulating (PWM), current-mode DC-DC controllers are  
designed for a wide range of DC-DC conversion applica-  
tions 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.  
♦ 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 oper-  
ating 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  
The MAX669, optimized for low input voltages with a  
guaranteed start-up voltage of 1.8V, requires boot-  
strapped operation (IC powered from boosted output). It  
supports output voltages up to 28V. The MAX668 oper-  
ates with inputs as low as 3V and can be connected in  
either a bootstrapped or non-bootstrapped (IC powered  
from input supply or other source) configuration. When  
not bootstrapped, it has no restriction on output voltage.  
Both ICs are available in an extremely compact 10-pin  
µMAX package.  
Ordering Information  
PART  
TEMP. RANGE  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
10 µMAX  
MAX668EUB  
MAX669EUB  
10 µMAX  
Idle Mode is a trademark of Maxim Integrated Products.  
Pin Configuration  
Typical Operating Circuit  
V
IN  
= 1.8V to 28V  
TOP VIEW  
V
OUT  
= 28V  
V
CC  
SYNC/  
SHDN  
EXT  
CS+  
LDO  
FREQ  
GND  
REF  
1
2
3
4
5
10 SYNC/SHDN  
9
8
7
6
V
CC  
FREQ  
MAX668  
MAX669  
EXT  
MAX669  
GND  
PGND  
CS+  
FB  
PGND  
FB  
LDO  
REF  
µMAX  
________________________________________________________________ Maxim Integrated Products  
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.  
For small orders, phone 1-800-835-8769.  
1234567...18

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