MAX1522, MAX1523, MAX1524 Simple SOT23 Boost Controllers

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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.

Key Features

Applications/Uses

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 I_OUT Range
Pin-Selectable Maximum Duty Factor
Micropower Shutdown Mode
Small 6-Pin SOT23 Package
No Current-Sense Resistor

	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

Key Specifications: Step-Up Switching Regulators

Part Number

V_IN (min) (V)

V_IN (max) (V)

Min. V_OUT (V)

Max. V_OUT (V)

I_OUT (A)

Output Adj. Method

Operating Current, I_CC (max) (mA)

Number of DC-DC Outputs

Operating Freq. (kHz)

Features

EV-Kit

Package

RoHS Available

Operating Temp. Range (°C)

Price^**

MAX1522

2.5

5.5

2.5

100

Resistor

0.05

1000
160

•	Fixed Frequency/ PWM Operation

•	Output Undervoltage Protection

•

Shutdown

•	Soft Start

Yes

SOT-23/6

Yes

-40 to +85

$1.07 @ 1k

MAX1523

2.5

100

0.95

1000
160
900

$1.07 @ 1k

MAX1524

1.5

0.95

1000
160

$1.07 @ 1k

See All Step-Up Switching Regulators (89)

Key Specifications: Switch-Mode DC-DC Power Supplies

Part Number

Topology

V_IN (min) (V)

V_IN (max) (V)

Number of DC-DC Outputs

Digital/VID Programmed Output

Min. Adjustable V_OUT (V)

Max. Adjustable V_OUT (V)

I_OUT (A)

Operating Current, I_CC (max) (mA)

Operating Freq. (kHz)

Internal Power Switch(es)

Package

Price^**

MAX1522

Step-Up

2.5

5.5

2.5

100

0.05

1000
160

SOT-23/6

$1.07 @ 1k

MAX1523

2.5

100

0.95

1000
160
900

$1.07 @ 1k

MAX1524

1.5

0.95

1000
160

$1.07 @ 1k

See All Switch-Mode DC-DC Power Supplies (429)

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 prices and delivery, please see the price and availability page or contact an authorized distributor.