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Simple SOT23 Boost Controllers

Product Details

Key Features

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 2.5
VIN (V) (max) 5.5
VOUT1 (V) (min) 2.5
VOUT1 (V) (max) 100
IOUT1 (A) (max) 1
Switch Type External
Output Adjust. Method Resistor
IQ (mA) (typ) 0.025
Shutdown Mode Supply Current (µA) (typ) 0.001
Shutdown Mode Supply Current (µA) (max) 1
# DC-DC Outputs 1
Switching Frequency (kHz) 1000
Package/Pins SOT23/6
Budgetary
Price (See Notes)
1.79
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 2.5
VIN (V) (max) 5.5
VOUT1 (V) (min) 2.5
VOUT1 (V) (max) 100
IOUT1 (A) (max) 1
Switch Type External
Output Adjust. Method Resistor
IQ (mA) (typ) 0.025
Shutdown Mode Supply Current (µA) (typ) 0.001
Shutdown Mode Supply Current (µA) (max) 1
# DC-DC Outputs 1
Switching Frequency (kHz) 1000
Package/Pins SOT23/6
Budgetary
Price (See Notes)
1.79

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

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.

Simplified Block Diagram

MAX1522, MAX1523, MAX1524: Typical Operating Circuit MAX1522, MAX1523, MAX1524: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .