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MAX1884EUP+

更新时间： 2024-11-06 04:25:07
品牌 Logo 应用领域
美信 - MAXIM 信息通信管理光电二极管
页数 文件大小 规格书
38页 1048K
描述
Switching Regulator, Current-mode, 2.05A, 575kHz Switching Freq-Max, BICMOS, PDSO20, 4.40 MM, 1.10 MM HEIGHT, TSSOP-20

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MAX1884EUP+ 数据手册

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19-1979; Rev 0a; 3/01  
Quad-Output TFT LCD DC-DC  
Converters with Buffer  
General Description  
Features  
The MAX1778/MAX1880–MAX1885 multiple-output  
DC-DC converters provide the regulated voltages  
required by active matrix thin-film transistor (TFT) liquid  
crystal displays (LCD) in a low-profile TSSOP package.  
One high-power step-up converter and two low-power  
charge pumps convert the 2.7V to 5.5V input voltage  
into three independent output voltages. A built-in linear  
regulator and VCOM buffer complete the power-supply  
requirements.  
o 500kHz/1MHz Current-Mode PWM Step-Up  
Regulator  
Up to +13V Main High-Power Output  
1ꢀ ꢁAAurate  
High EffiAienAy (91ꢀ)  
o Dual Regulated Charge-Pump Outputs  
(MꢁX1778/MꢁX1880/MꢁX1881/MꢁX1882 only)  
Up to +40V Positive Charge-Pump Output  
Up to -40V Negative Charge-Pump Output  
o Low-Dropout 40mꢁ Linear Regulator  
(MꢁX1778/MꢁX1881/MꢁX1883/MꢁX1884 only)  
Up to +15V LDO Input  
The main step-up converter accurately generates an  
externally set output voltage up to 13V that can supply  
the display’s row/column drivers. The converter’s high  
switching frequency and current-mode PWM architec-  
ture provide fast transient response and allow the use  
of small low-profile inductors and ceramic capacitors.  
The low-power BiCMOS control circuitry and internal  
14V switch (0.35Ω N-channel MOSFET) enable efficien-  
cies up to 91%.  
o Optional Higher Current with External Transistor  
o 2.7V to 5.5V Input Supply  
o Internal Supply SequenAing and Soft-Start  
o Power-Ready Output  
The dual low-power charge pumps (MAX1778/  
MAX1880/MAX1881/MAX1882 only) independently reg-  
o ꢁdjustable Fault-DeteAtion LatAh  
o Thermal ProteAtion (+160°C)  
ulate one positive output (V  
) and one negative out-  
POS  
put (V  
). These low-power outputs use external  
NEG  
o 0.1µꢁ Shutdown Current  
diode and capacitor stages (as many stages as  
required) to regulate output voltages up to +40V and  
-40V. A unique control scheme minimizes output ripple  
as well as capacitor sizes for both charge pumps.  
o 0.7mꢁ IN QuiesAent Current  
o Ultra-Small External Components  
o Thin TSSOP PaAkage (1.1mm max height)  
A resistor-programmable, 40mA, low-dropout linear  
regulator (MAX1778/MAX1881/MAX1883/MAX1884  
only) provides preregulation or postregulation for any of  
the supplies. For higher current applications, an exter-  
nal transistor can be added. Additionally, the VCOM  
buffer provides a high current output that is ideal for  
driving the capacitive backplane of TFT LCD panels.  
The VCOM buffer’s output voltage is preset with an  
internal 50% resistive-divider or can be externally  
adjusted for other voltages.  
Ordering Information  
PART  
TEMP. RANGE  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
24 TSSOP  
24 TSSOP  
24 TSSOP  
24 TSSOP  
20 TSSOP  
20 TSSOP  
20 TSSOP  
MAX1778EUG  
MAX1880EUG  
MAX1881EUG  
MAX1882EUG  
MAX1883EUP  
MAX1884EUP  
MAX1885EUP  
The MAX1778/MAX1880–MAX1885 are protected  
against output undervoltage and thermal overload con-  
ditions by a latched fault detection circuit that shuts  
down the device. All devices are available in the ultra-  
thin TSSOP package (1.1mm max height).  
Applications  
TFT LCD Notebook Displays  
Typical Operating Circuit appears at end of data sheet.  
TFT LCD Desktop Monitor Panels  
Pin Configurations and Selector Guide appear at end of  
data sheet.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...38

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