MAX1530
Multiple-Output Power-Supply Controllers for LCD Monitors
Show MoreMultiple-Output Power-Supply Controllers Generate All the Supply Rails for Thin-Film Transistor (TFT) Liquid-Crystal Display (LCD) Monitors
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- 4.5V to 28V Input Voltage Range
- 250kHz/500kHz Current-Mode Step-Down Converter
- Small Inductor/Capacitors
- No Sense Resistor
- Three Positive Linear Regulator Controllers
- One Positive and One Negative Additional Controller (MAX1531)
- Small Input and Output Capacitors
- Timed Reset Output
- Uncommitted Overcurrent Protection (MAX1531)
- Soft-Start for All Regulators
- Programmable Input Undervoltage Comparator
- Programmable Startup Sequencing
The MAX1530/MAX1531 multiple-output power-supply controllers generate all the supply rails for thin-film transistor (TFT) liquid-crystal display (LCD) monitors. Both devices include a high-efficiency, fixed-frequency, step-down regulator. The low-cost, all N-channel, synchronous topology enables operation with efficiency as high as 93%. High-frequency operation allows the use of small inductors and capacitors, resulting in a compact solution. The MAX1530 includes three linear regulator controllers and the MAX1531 includes five linear regulator controllers for supplying logic and LCD bias voltages. A programmable startup sequence enables easy control of the regulators.
The MAX1530/MAX1531 include soft-start functions to limit inrush current during startup. An internal step-down converter current-limit function and a versatile overcurrent shutdown protect the power supplies against fault conditions. The MAX1530/MAX1531 use a current-mode control architecture, providing fast load transient response and easy compensation. An internal linear regulator provides MOSFET gate drive and can be used to power small external loads.
The MAX1530/MAX1531 can operate from inputs as high as 28V and are well suited for LCD monitor and TV applications running directly from AC/DC wall adapters. Both devices are available in a small (5mm x 5mm), ultra-thin (0.8mm), 32-pin QFN package and operate over the -40°C to +85°C temperature range.
Applications
- LCD Monitors and TVs
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MAX1530
Documentation
Filters
1 Applied
Documentation
Software & Part Ecosystem
Parts | Product Life Cycle | Description | ||
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Internal Power Switch Buck Regulators1 |
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Obsolete |
xDSL/Cable Modem Triple/Quintuple Output Power Supplies |
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LCD/CCD/OLED Bias1 |
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PRODUCTION |
Quintuple/Triple-Output TFT LCD Power Supplies with Fault Protection and VCOM Buffer |
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Product3 |
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NOT RECOMMENDED FOR NEW DESIGNS |
Quad-Output TFT LCD DC-DC Converters with Buffer |
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Triple-Output TFT LCD Power Supply with Fault Protection |
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Quintuple/Triple-Output TFT LCD Power Supplies with Fault Protection and VCOM Buffer |
Evaluation Kits 1
MAX1531EVKIT
Evaluation Kit for the MAX1530/MAX1531
Product Detail
The MAX1531 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that provides logic and bias power required for liquid crystal display (LCD) monitors. The EV kit contains a step-down switching regulator, a logic-supply linear regulator, a source-driver-supply linear regulator, a gamma-reference linear regulator, a two-stage positive charge pump and linear regulator for the TFT gate-on supply, and a one-stage negative charge pump and linear regulator for the TFT gate-off supply. The source-driver supply, the gamma-reference supply, the gate-on supply, and the gate-off supply can be sequenced in any power-up order. The EV kit also includes a MAX1522 step-up switching regulator to provide a higher output voltage option for the source-driver supply and the gamma reference.
The EV kit produces the output voltages listed in the features column using a +10.5V to +24V input voltage range. The input range can be reduced to +9.5V if the included MAX1522 step-up regulator circuit is used. If lower output voltages are acceptable, the input range can be further reduced to +8V.
The EV kit features undervoltage protection for the input, overcurrent protection for the step-down switching regulator, and overload protection for the sourcedrive linear regulator. Operation at 500kHz allows the use of small surface-mount components. The EV kit also evaluates the MAX1530.
Applications
- Automotive LCDs
- LCD Monitors and TVs