Torex Semiconductor introduces XCM519 MCM
Torex Semiconductor
XCM519 MCM
Torex Semiconductor has unveiled its XCM519 multi-chip module (MCM).
The XCM519 integrates an XC9235/XC9236 synchronous step-down DC/DC converter with a high-performance XC6601 NMOS low-dropout (LDO) voltage regulator in a cost-effective, space-saving package.
The module meets the requirements of battery-driven applications such as mobile phones, personal digital assistants (PDAs), gaming devices and Bluetooth equipment, with the DC/DC converter providing a step-down from the battery.
The lower voltage feeds the NMOS LDO with the intention of providing a highly stable, low-noise supply for the equipment's onboard processor's core.
The DC/DC converter block operates from a supply voltage range between 2.7V and 6.0V, providing output voltages between 0.8V and 4.0V and output currents up to 600mA.
The switching frequency can be selected from 1.2MHz or 3.0MHz as required.
The XCM519 is available in two versions to provide PWM control or automatic PWM/PFM switching control, providing fast response, low ripple and high efficiency (92 per cent typical) over the full load range.
The LDO regulator block operates from a BIAS voltage range of between 2.5V and 6.0V and an input voltage of between 1.0V and 3.0V, providing output voltages between 0.7V and 1.8V to an accuracy of +/-20mV.
Using an NMOS transistor driver, instead of the PMOS, means that the regulator has a much lower dropout voltage (just 35mV at 100mA), enabling the device to be used at lower input voltages.
Load currents of up to 400mA can be achieved.
Over-current protection and thermal shutdown circuits are included to protect the regulator against excess current draw or over-temperature.
Each block of the XCM519 includes a built-in under-voltage lockout (UVLO) function and both blocks feature standby operating modes to greatly reduce power consumption.
The XCM519 is available in an ultra-small USP-12B01 (2.8mm x 2.3mm x 0.6mm) package and requires the minimum number of components to build the complete power management circuit; all that is required is a small coil and ceramic capacitors connected externally.
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