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MAX1522

MAX1522

Simple SOT23 Boost Controllers

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Overview

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 component 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 conditions. 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.
MAX1522, MAX1523, MAX1524: Typical Operating Circuit MAX1522, MAX1523, MAX1524: Typical Operating Circuit Enlarge+

Key Features

  • Simple, Flexible Application Circuit
  • 2-Cell NiMH or Alkaline Operation (MAX1524)
  • Low Quiescent Current (25µA typ)
  • Output Fault Protection and Soft-Start
  • High Efficiency Over 1000:1 IOUT Range
  • Pin-Selectable Maximum Duty Factor
  • Micropower Shutdown Mode
  • Small 6-Pin SOT23 Package
  • No Current-Sense Resistor

Applications/Uses

  • Industrial +24V and +28V Power Supplies
  • LCD Bias Supplies
  • Low-Cost Battery-Powered Applications
  • Low-Cost, High-Current, or High-Voltage Boost Conversion
  • Low-Cost, Multi-Output Flyback Converters
  • SEPIC Converters

Parametric Specs

See parametric specs for Step-Up Switching Regulators (101)


Part NumberVIN
(V)		VIN
(V)		VOUT1
(V)		VOUT1
(V)		IOUT1
(A)		Output Adjust. MethodSwitch TypeICC
(mA)		Shutdown Mode Supply Current
(µA)		Shutdown Mode Supply Current
(µA)		DC-DC OutputsOper. Freq.
(kHz)		Package/PinsBudgetary
Price
minmaxminmaxmaxtyptypmaxSee Notes
MAX1522 2.55.52.51001ResistorExternal0.0250.001111000
SOT23/6
$1.12 @1k
MAX1523 
SOT23/6
$1.69 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources


MAX1522EVKIT: Evaluation Kit for the MAX1522, MAX1523, MAX1524
MAX1523EVKIT: Evaluation Kit for the MAX1522, MAX1523, MAX1524
MAX1524EVKIT: Evaluation Kit for the MAX1522, MAX1523, MAX1524

Technical Documents

App Note 4497 Single-Inductor Circuit Generates Bipolar Supply Voltages
App Note 3425 Converter Boosts One-Cell Battery Voltage to 50V

Quality And Environmental

Request Reliability Report for: MAX1522 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

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    Technical Docs

    Reference Designs