MAX1748
PRODUCTIONTriple-Output TFT-LCD DC-DC Converters
- Part Models
- 2
- 1ku List Price
- Starting From $1.56
Part Details
- Three Integrated DC-DC Converters
- 1MHz Current-Mode PWM Boost Regulator
- Up to +13V Main High-Power Output
- ±1% Accuracy
- High Efficiency (93%)
- 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
- 0.6mA Quiescent Current
- Internal Soft-Start
- Power-Ready Output
- Ultra-Small External Components
- Thin TSSOP Package (1.1mm max)
The MAX1748/MAX8726 triple-output DC-DC converters in a low-profile TSSOP package provide the regulated voltages required by active-matrix, thin-film transistor (TFT) liquid-crystal displays (LCDs). One high-power DC-DC converter and two low-power charge pumps convert the +3.3V to +5V input supply voltage into three independent output voltages.
The primary 1MHz DC-DC converter generates a boosted output voltage (VMAIN) up to 13V using ultra-small inductors and ceramic capacitors. The low-power BiCMOS control circuitry and the low on-resistance (0.35Ω) of the integrated power MOSFET allows efficiency up to 93%.
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.
For both the MAX1748 and MAX8726, the supply sequence is VMAIN first, VNEG next, and finally VPOS. The MAX1748 soft-starts each supply as soon as the previous supply finishes. The MAX8726 adds a delay between the startups of VMAIN and VNEG and also between VNEG and VPOS.
The MAX1748/MAX8726 are 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
Data Sheet 1
Reliability Data 1
Technical Articles 1
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 |
|---|---|---|---|
| MAX1748EUE+ | 16-TSSOP_4.4-4.4_MM | ||
| MAX1748EUE+T | 16-TSSOP_4.4-4.4_MM |
This is the most up-to-date revision of the Data Sheet.
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| LCD/CCD/OLED Bias 1 | ||
| MAX1997 | PRODUCTION | Quintuple/Triple-Output TFT LCD Power Supplies with Fault Protection and VCOM Buffer |
| Product 6 | ||
| MAX1664 | Active Matrix Liquid Crystal Display (AMLCD) Supply | |
| MAX1790 | NOT RECOMMENDED FOR NEW DESIGNS | Low-Noise Step-Up DC-DC Converters |
| MAX1778 | NOT RECOMMENDED FOR NEW DESIGNS | Quad-Output TFT LCD DC-DC Converters with Buffer |
| MAX1779 | NOT RECOMMENDED FOR NEW DESIGNS | Low-Power Triple-Output TFT LCD DC-DC Converter |
| MAX1880 | Quad-Output TFT LCD DC-DC Converters with Buffer | |
| MAX1889 | Triple-Output TFT LCD Power Supply with Fault Protection |
Evaluation Kits
Evaluation Kit for the MAX1748, MAX1779
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