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The MAX1556ETB is a low-current (16µA), fixed-frequency buck regulator. These converters feature high operating frequency, low quiescent current, and low dropout voltage. The low quiescent current (27µA) makes them ideal for portable devices powered by a single lithium-ion battery or three alkaline/NiMH batteries. The MAX1556 can deliver up to 1.2A of current, with pin-selectable output voltages of 1.8V, 2.5V, and 3.3V, or an adjustable output. The MAX1557 can deliver up to 600mA of current, with pin-selectable output voltages of 1V, 1.3V, and 1.5V, or an adjustable output.

The MAX1556ETB incorporates a low-on-resistance internal MOSFET switch and a synchronous rectifier to provide efficient, low dropout performance with minimal external components. Using a proprietary topology, it ensures excellent performance under both light and full load conditions in a high fixed-frequency operating mode. A 1MHz PWM switching frequency minimises external component size. Both devices feature adjustable soft-start functionality to reduce transient load changes on the battery.

The MAX1556ETB is available in a compact 10-pin TDFN (3mm x 3mm) package.

MAX1556ETB Features

Up to 97% efficiency

95% efficiency at 1mA load current

16µA low quiescent current

1MHz PWM switching

3.3µH small-size inductor

Selectable output voltages: 3.3V, 2.5V, 1.8V, 1.5V, 1.3V, 1.2V, 1.0V, or adjustable output

Guaranteed 1.2A output current (MAX1556)

Voltage configuration optimises load transient response

27µA quiescent current at low voltage drop

0.1µA low shutdown current

No external Schottky diode required

Zero overshoot current with analog soft start

MAX1556ETB Parameters

Product Type: Switching Regulator    

Package/Case: TDFN-EP-10    

Topology: Buck    

Output Voltage: 750 mV to 5.5 V    

Output Current: 1.2 A    

Number of Outputs: 1 Output

Input Voltage - Minimum:    2.6 V    

Input Voltage - Maximum:    5.5 V    

Quiescent Current:    16 µA    

Switching Frequency:    1 MHz    

Minimum Operating Temperature:    -40°C    

Maximum Operating Temperature:    +85°C    

Series:    MAX1556

Applications for MAX1556ETB

Cellular phones/smartphones

Digital cameras and portable camcorders  

Handheld instruments  

PDAs and handheld computers  

Portable MP3 and DVD players

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