MAX1779
NOT RECOMMENDED FOR NEW DESIGNSLow-Power Triple-Output TFT LCD DC-DC Converter
Industry's-First High-Performance Boost Regulator with Dual Charge-Pump Regulators for Small-Sized Battery-Powered LCD Applications
- Part Models
- 2
- 1ku List Price
- Starting From $2.09
Overview
- Three Integrated DC-DC Converters
- 250kHz Current-Mode PWM Boost Regulator
- Up to +13V Main High-Power Output
- ±1% Accuracy
- High Efficiency (91%)
- Dual Charge-Pump Outputs
- Up to +40V Positive Charge-Pump Output
- Down to -40V Negative Charge-Pump Output
- Internal Supply Sequencing
- Internal Power MOSFETs
- +2.7V to +5.5V Input Supply
- 0.1µA Shutdown Current
- 0.5mA Quiescent Current
- Internal Soft-Start
- Power-Ready Output
- Ultra-Small External Components
- Thin TSSOP Package (1.1mm max)
The MAX1779 triple-output DC-DC converter provides highly efficient regulated voltages required by small active matrix, thin-film transistor (TFT) liquid-crystal displays (LCDs). One high-power DC-DC converter and two low-power charge pumps convert the +2.7V to +5.5V input supply voltage into three independent output voltages.
The primary high-power DC-DC converter generates a boosted output voltage (VMAIN) up to 13V that is regulated within ±1%. The low-power BiCMOS control circuitry and the low on-resistance (1 ohm) of the integrated power MOSFET allows efficiency up to 91%. The 250kHz current-mode pulse-width modulation (PWM) architecture provides fast transient response and allows the use of ultra-small inductors and ceramic capacitors.
The dual charge pumps independently regulate one positive output (VPOS) and one negative output (VNEG). These low-power outputs use external diode and capacitor stages (as many stages as required) to regulate output voltages up to +40V and down to -40V. A proprietary regulation algorithm minimizes output ripple, as well as capacitor sizes for both charge pumps.
The MAX1779 is available in the ultra-thin TSSOP package (1.1mm max height).
Applications
- Camcorders
- Digital Still Cameras
- Passive-Matrix LCD Displays
- PDAs
- TFT Active-Matrix LCD Displays
Documentation
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX1779EUE+ | TSSOP_4.4 / TSSOP_6.1 | ||
| MAX1779EUE+T | TSSOP_4.4 / TSSOP_6.1 |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Evaluation Kits
Evaluation Kit for the MAX1748, MAX1779
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