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MAX1880 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1880 Datasheet(HTML) 1 Page - Maxim Integrated Products |
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1 / 39 page  For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com. MAX1778/ MAX1880–MAX1885 Quad-Output TFT LCD DC-DC Converters with Buffer General Description 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. 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 (0.35 Ω N-channel MOSFET) enable efficien- cies up to 91%. The dual low-power charge pumps (MAX1778/ MAX1880/MAX1881/MAX1882 only) independently reg- ulate one positive output (VPOS) and one negative out- put (VNEG). These low-power outputs use external 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. 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. 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 TFT LCD Desktop Monitor Panels Features o 500kHz/1MHz Current-Mode PWM Step-Up Regulator Up to +13V Main High-Power Output ±1% Accurate High Efficiency (91%) o Dual Regulated Charge-Pump Outputs (MAX1778/MAX1880–MAX1882 only) Up to +40V Positive Charge-Pump Output Up to -40V Negative Charge-Pump Output o Low-Dropout 40mA Linear Regulator (MAX1778/MAX1881/MAX1883/MAX1884 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 o Adjustable Fault-Detection Latch o Thermal Protection (+160°C) o 0.1µA Shutdown Current o 0.7mA IN Quiescent Current o Ultra-Small External Components o Thin TSSOP Package (1.1mm max height) 19-1979; Rev 2; 10/12 Ordering Information PART TEMP RANGE PIN-PACKAGE MAX1778EUG -40 °C to +85°C 24 TSSOP MAX1778EUG+ -40 °C to +85°C 24 TSSOP MAX1880EUG -40 °C to +85°C 24 TSSOP MAX1880EUG/V+ -40 °C to +85°C 24 TSSOP MAX1881EUG -40 °C to +85°C 24 TSSOP MAX1882EUG -40 °C to +85°C 24 TSSOP MAX1883EUP -40 °C to +85°C 20 TSSOP MAX1884EUP -40 °C to +85°C 20 TSSOP MAX1885EUP -40 °C to +85°C 20 TSSOP Typical Operating Circuit appears at end of data sheet. Pin Configurations and Selector Guide appear at end of data sheet. + Denotes a lead(Pb)-free/RoHS-compliant package. /V denotes an automotive qualified part. |
Similar Part No. - MAX1880_12 |
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Similar Description - MAX1880_12 |
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