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MAX1885_12

更新时间： 2024-11-05 11:59:11
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美信 - MAXIM 转换器
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39页 824K
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Quad-Output TFT LCD DC-DC Converters with Buffer

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MAX1885_12 数据手册

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MAX1778/  
MAX1880–MAX1885  
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 ꢁccurate  
High Efficiency (91ꢀ)  
o Dual Regulated Charge-Pump Outputs  
(MꢁX1778/MꢁX1880–MꢁX1882 only)  
Up to +40V Positive Charge-Pump Output  
Up to -40V Negative Charge-Pump Output  
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 Low-Dropout 40mꢁ Linear Regulator  
(MꢁX1778/MꢁX1881/MꢁX1883/MꢁX1884 only)  
Up to +15V LDO Input  
o Optional Higher Current with External Transistor  
o 2.7V to 5.5V Input Supply  
o Internal Supply Sequencing and Soft-Start  
o Power-Ready Output  
The dual low-power charge pumps (MAX1778/  
MAX1880/MAX1881/MAX1882 only) independently reg-  
o ꢁdjustable Fault-Detection Latch  
o Thermal Protection (+160°C)  
ulate one positive output (V  
) and one negative out-  
POS  
o 0.1µꢁ Shutdown Current  
put (V  
). These low-power outputs use external  
NEG  
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 Quiescent Current  
o Ultra-Small External Components  
o Thin TSSOP Package (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  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
24 TSSOP  
24 TSSOP  
24 TSSOP  
24 TSSOP  
24 TSSOP  
24 TSSOP  
20 TSSOP  
20 TSSOP  
20 TSSOP  
MAX1778EUG  
MAX1778EUG+  
MAX1880EUG  
MAX1880EUG/V+  
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).  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
/V denotes an automotive qualified part.  
Applications  
TFT LCD Notebook Displays  
TFT LCD Desktop Monitor Panels  
Typical Operating Circuit appears at end of data sheet.  
Pin Configurations and Selector Guide appear at end of  
data sheet.  
For pricing, delivery, and ordering information, please contact Maxim Direct  
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.  
19-1979; Rev 2; 10/12  
1234567...39

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