Monolithic Power Systems MP2126

Description

The MP2126 is an internally compensated 2.5A synchronous step-down switcher plus a standalone 0.5A low dropout (LDO) linear regulator. It is ideal for powering portable equipment that runs from a single cell Lithium-Ion (Li+) Battery. The MP2126 can provide up to 2.5A to the switcher output, and 0.5A load current to the LDO output from a 2.5V to 6V input voltage. Both switcher and LDO output voltages can be regulated as low as 0.6V.

The 2.5A switcher features an integrated high side switch and synchronous rectifier for high efficiency. The switcher operating frequency is internally set at 1.25MHz. With peak current mode control and internal compensation, the MP2126 can be stabilized with ceramic capacitors and small inductors. Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown.

The standalone 0.5A LDO output is used to power noise sensitive circuitry. The LDO separate input supply pin (IN2) can be connected to the switcher output to reduce power dissipation and noise from the main switcher.MP2126 is available in an 8-pin SOIC package with exposed pad.

Features

• -2.5A Switcher Output Current
• -0.5A LDO Output Current
• -Internal Power MOSFET Switches
• -Stable with Ceramic Capacitors
• -Up to 90% Efficiency for Switcher
• -Switcher Low Dropout Operation: 100% Duty Cycle
• -1μA Shutdown Current
• -1.25MHz Switching Frequency
• -Thermal Shutdown
• -Cycle-by-Cycle Over Current Protection
• -Short Circuit Protection
• -Internal Soft-start for Switcher
• -Power On Reset Output
• -2.5V to 6V Input Range VIN1 for Switcher
• -1V to VIN1 Input Range VIN2 for LDO
• -Available in 8-pin SOIC with Exposed Pad

Typical applications

• DVD+/-RW Drives
• Industrial Instruments
• LCD TVs

More information

• Datasheet
• IC product information