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MAX1524 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1524 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 14 page General Description The MAX1522/MAX1523/MAX1524 are simple, compact boost controllers designed for a wide range of DC-DC conversion topologies, including step-up, SEPIC, and flyback applications. They are for applications where extremely low cost and small size are top priorities. These devices are designed specifically to provide a simple application circuit and minimize the size and number of external components, making them ideal for PDAs, digital cameras, and other low-cost consumer electronics applications. These devices use a unique fixed on-time, minimum off- time architecture, which provides excellent efficiency over a wide-range of input/output voltage combinations and load currents. The fixed on-time is pin selectable to either 0.5µs (50% max duty cycle) or 3µs (85% max duty cycle), permitting optimization of external compo- nent size and ease of design for a wide range of output voltages. The MAX1522/MAX1523 operate from a +2.5V to +5.5V input voltage range and are capable of generating a wide range of outputs. The MAX1524 is intended for bootstrapped operation, permitting startup with lower input voltage. All devices have internal soft-start and short-circuit protection to prevent excessive switching current during startup and under output fault condi- tions. The MAX1522/MAX1524 have a latched fault mode, which shuts down the controller when a short- circuit event occurs, whereas the MAX1523 reenters soft-start mode during output fault conditions. The MAX1522/MAX1523/MAX1524 are available in a space- saving 6-pin SOT23 package. ________________________Applications ____________________________Features o Simple, Flexible Application Circuit o 2-Cell NiMH or Alkaline Operation (MAX1524) o Low Quiescent Current (25µA typ) o Output Fault Protection and Soft-Start o High Efficiency Over 1000:1 IOUT Range o Pin-Selectable Maximum Duty Factor o Micropower Shutdown Mode o Small 6-Pin SOT23 Package o No Current-Sense Resistor Simple SOT23 Boost Controllers ________________________________________________________________ Maxim Integrated Products 1 __________Typical Operating Circuit 19-1926; Rev 0; 2/01 For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. EVALUATION KIT AVAILABLE PART TEMP. RANGE PIN- PACKAGE TOP MARK MAX1522EUT-T -40 °C to +85°C 6 SOT23-6 AAOX MAX1523EUT-T -40 °C to +85°C 6 SOT23-6 AAOY MAX1524EUT-T -40 °C to +85°C 6 SOT23-6 AAOZ Ordering Information Pin Configurations FB SHDN SET 16 VCC 5 EXT GND MAX1522 MAX1523 MAX1524 SOT23-6 TOP VIEW 2 34 MAX1522 MAX1523 MAX1524 INPUT OFF ON 6 3 4 5 2 1 VCC EXT SET FB SHDN GND OUTPUT VCC 50% 85% N Low-Cost, High-Current, or High-Voltage Boost Conversion LCD Bias Supplies Industrial +24V and +28V Power Supplies Low-Cost, Multi-Output Flyback Converters SEPIC Converters Low-Cost Battery- Powered Applications |
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