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MAX1729

更新时间： 2024-09-17 22:57:59
品牌 Logo 应用领域
美信 - MAXIM 温度补偿
页数 文件大小 规格书
12页 160K
描述
ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation

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MAX1729 数据手册

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19-1406; Rev 1; 1/99  
ECB a nd LCD Dis pla y Bia s Supply w ith Ac c ura te  
Output Volta ge a nd Te m pe ra ture Com pe ns a tion  
MAX1729  
Ge n e ra l De s c rip t io n  
Fe a t u re s  
The MAX1729 micropower step-up/step-down DC-DC  
converter is ideally suited for electrically controlled bire-  
fringence (ECB) and liquid-crystal-display (LCD) bias-  
s up p ly g e ne ra tion. It p rovid e s s te p -up /s te p -d own  
voltage conversion and reduces output ripple by using  
a step-up DC-DC converter followed by a linear regula-  
tor. This architecture permits a physically smaller induc-  
tor than those used in competing SEPIC and flyback  
topologies. This device features low quiescent current  
(67µA typical). A logic-controlled shutdown mode fur-  
ther reduces quiescent current to 0.4µA typical.  
♦ High-Accuracy Reference Voltage (±1%)  
♦ ±11ppm/°C Output Voltage Drift  
♦ On-Chip Temperature Sensor Output  
♦ Accurate Voltage and Temperature Provide:  
Consistent ECB Colors  
Consistent LCD Gray-Scale Contrast  
♦ +2.7V to +5.5V Input Voltage Range  
♦ Output Voltage Range  
+2.5V to +16V in Internal Feedback Mode  
Programmable in External Feedback Mode  
The MAX1729 fe a ture s a n inp ut tha t d yna mic a lly  
adjusts the output voltage to control display color or  
contrast. It offers two feedback modes: internal and  
external. Internal feedback mode allows output volt-  
a g e s b e twe e n 2.5V a nd 16V, a nd is s p e c ific a lly  
d e s ig ne d to hold te mp e ra ture d rift to ± 11p p m/°C.  
External feedback mode allows the MAX1729 output  
voltage range to be tailored for various displays.  
♦ Dynamic Control of the Output Voltage  
♦ 67µA Supply Current  
♦ 0.4µA Shutdown Current  
♦ 10-Pin µMAX Package (1.09mm max height)  
♦ Evaluation Kit Available (MAX1729EVKIT)  
An on-chip temperature sensor with a positive tempera-  
ture coefficient provides compensation for LCD/ECB  
display temperature characteristics. In internal feed-  
back mode, the buffered temperature sensor output is  
read and used to adjust the output voltage via a digital  
control signal. External feedback mode features an  
additional compensation method in which the tempera-  
ture output is summed directly into the feedback net-  
work to p rovid e firs t-ord e r ne g a tive te mp e ra ture  
compensation of the output voltage. The MAX1729 is  
available in the space-saving 10-pin µMAX package.  
Ord e rin g In fo rm a t io n  
PART  
TEMP. RANGE  
PIN-PACKAGE  
MAX1729EUB  
-40°C to +85°C  
10 µMAX  
Typ ic a l Op e ra t in g Circ u it  
Ap p lic a t io n s  
ECB Display Bias & Color Adjustment  
LCD Display Bias & Contrast Adjustment  
Cellular Phones  
V
IN  
2.7V to 5.5V  
Personal Digital Assistants  
IN  
LX  
PS  
GND  
P in Co n fig u ra t io n  
MAX1729  
V
REF  
OUT  
OUT  
TOP VIEW  
+2.5V to +16V  
DIGITAL  
PWM  
CONTROLLER  
IN  
TC  
1
2
3
4
5
10 GND  
CTLIN  
TC  
FB  
9
8
7
6
LX  
MAX1729  
REF  
PS  
ADC  
COMP  
COMP  
FB  
OUT  
CTLIN  
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.  
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