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Maxim Integrated - Simple SOT23 Boost Controllers

Numéro de référence MAX1522-MAX1524
Description Simple SOT23 Boost Controllers
Fabricant Maxim Integrated 
Logo Maxim Integrated 





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MAX1522-MAX1524 fiche technique
19-1926; Rev 0; 2/01
EVAALVUAAILTAIOBNLEKIT
Simple SOT23 Boost Controllers
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
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
Pin Configurations
TOP VIEW
GND 1
6 VCC
FB 2
MAX1522
MAX1523
MAX1524
5 EXT
SET 3
4 SHDN
____________________________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
Ordering Information
PART
TEMP. RANGE
MAX1522EUT-T
MAX1523EUT-T
MAX1524EUT-T
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
6 SOT23-6
6 SOT23-6
6 SOT23-6
TOP
MARK
AAOX
AAOY
AAOZ
__________Typical Operating Circuit
INPUT
VCC
6 VCC
5
EXT
50% 85%
OFF ON
MAX1522
3 SET MAX1523 FB 2
MAX1524
4 SHDN
GND 1
N
OUTPUT
SOT23-6
________________________________________________________________ Maxim Integrated Products 1
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.

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