Torex Semiconductor offers XC6423 dual channel CMOS LDO regulators


Efficient thermal performance through direct die and pad connection

Click image to enlarge: The XC6423 dual-channel CMOS LDO regulators

The XC6423 is the latest generation of dual-channel CMOS LDO regulators from Torex Semiconductor. Comprising two independent LDO circuits, each able to deliver 300 mA, the XC6423 is available in an LGA-6A01 package measuring only 1.2 x 1.2 x 0.4 mm. The package uses a new construction technique, removing the traditional bonding wires in favour of direct connection between die and pads. This provides a significant improvement in thermal performance, resulting in higher power-dissipation limits when compared with traditional packaging techniques. The LGA-6A01 package construction offers benefits in other areas as well. Removing bonding wires between the die and pad also reduces the total resistance between the input and output pins of the LDO by an appreciable amount.  As a result the XC6423's drop-out voltage is typically only 95 mV @ 150 mA and VOUT = 3.0 V, which helps to extend usable battery life in portable electronic devices. Ultra-fast transient response ensures the highest level of output stability and each LDO circuit is completely isolated to ensure no cross-talk between channels during load fluctuations. The XC6423 delivers high PSRR—75 dB @ 1 kHz—and low-noise operation making it well suited for both RF and digital applications.  Consuming only 90 ?A per channel, the XC6423 is optimised for low-power applications and each output voltage can be set-up independently within a range of 1.2 to 3.6 V, in 50 mV steps with either a ±1% or 20 mV tolerance. Separate EN pins control the two channels independently and, in standby mode, the current consumption reduces to less than 100 nA. The XC6423 is fully compatible with low ESR ceramic capacitors and includes a CL discharge function with a dedicated internal switch to ensure the VOUT pin quickly returns to the VSS level when the LDO is shut-down via the EN pin. The XC6423 can work from inputs ranging from 1.6 to 5.5 V. The XC6423 also includes a number of protection features including a thermal shutdown circuit which forces the regulator off when the chip's temperature reaches 150 °C. The thermal shutdown circuit's hysteresis only allows the XC6423 to resume normal operation when the chip's temperature drops below 125 °C. The XC6423 also includes an over-current protection circuit that not only stops the IC when the output current is too high, but also permits the IC to automatically resume normal operation as soon as the over-current condition disappears. In-rush current protection is also included to help manage the start-up phase. Torex-Europe XC6423 product deeplink