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Diodes unveils low-power multi-channel load sink drivers

Posted: 11 Mar 2015 ?? ?Print Version ?Bookmark and Share

Keywords:Diodes? load sink driver? snubber circuit? MCU? CMOS?

Diodes Inc. has unleashed a couple of multi-channel load sink drivers. According to the company, the ULN2003V12 and ULN2003F12 both support 3.3V to 5V CMOS logic inputs, making them compatible with a range of MCUs and logic devices.

The ULN2003V12 is a 7-channel relay and inductive load sink driver that directly replaces the industry-standard ULN2003A from other vendors, while consuming 12 times less power. A 4-channel version, the ULN2003F12, is also offered; this provides a smaller footprint solution for when fewer output channels are required, such as when driving low-voltage stepper motors. Target end-markets for these devices include domestic appliances like washing machines and dishwashers.

ULN2003V12, ULN2003F12

The devices integrate an input RC snubber circuit, which improves performance in noisy operating conditions, and an internal input stage pull-down resistor to simplify the use of tri-state input logic, noted the company. The use of low-output impedance drivers minimises on-chip power dissipation while still supporting output pull-up voltages up to 20V. The devices feature low, 25?mA/channel supply current and outstanding ESD performance of 4kV HBM, making them suitable for industrial applications, Diodes indicated.

A key feature of the ULN2003V12 and ULN2003F12 devices is that each output is connected in a common-cathode configuration via internal freewheeling diodes to the COM pin. This provides an increased current sink capability by combining several adjacent channels in parallel. For example, under typical conditions the ULN2003V12 can handle a 1A load current when all seven channels are connected in parallel. Miniaturised packages help reduce board space requirements, with the ULN2003V12 available in SO-16 and TSSOP-16 packages, while the ULN2003F12 is offered in a U-DFN3030-10 package.





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