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Analog switches target one-cell Li-ion batteries

Posted: 30 Jun 2011 ?? ?Print Version ?Bookmark and Share

Keywords:analog switches? SPTD? DPDT?

Vishay Intertechnology Inc. has released new dual single pole, double throw (SPDT) and dual double pole, double throw (DPDT) CMOS low-voltage analog switches.

According to Vishay, the devices combine low-voltage operation and low on-resistance in small miniQFN packages for audio, SIM card, and multipurpose signal switching in space-constrained portable end products.

The DG2735A and DG2725 are dual SPDT switches, designed for an operating range of 1.65V to 4.3V.

The DG2735A switch offers guaranteed low 0.6ohms maximum on-resistance at 2.7V and fast turn-on time of 64ns and turn-off time of 42ns at 2.7V. Vishay said this makes it ideal for audio output switching in receivers and speakers.

The DG2725 offers typical on-resistance of 0.7ohms at 3V and provides lower parasitic capacitance.

The DG2599, on the other hand, has an operation voltage range of 1.65V to 5V and can be used as a quad SPDT or dual DPDT switch. It features the miniQFN16 package, on-resistance of 2.8? typical at 3V, and C3dB bandwidth to 186MHz.

Vishay said both the DG2725 and DG2599 have power off protection that guarantees less than 1microamp COM1 and COM2 leakage, when V+ = 0V and VCOM1 or VCOM2 = 4.3V.

According to Vishay, the DG2735A, DG2725 and DG2599 analog switches are designed for use in consumer, computer, and communication products, including cellphones, PMPs and PDAs, modems and peripherals, computers, eBooks, and tablet products.

The devices are compatible with 1.65V logic and are easily interfaced with low-voltage DSP or MCU control logic, making them well-suited for direct power from a one-cell Li-ion battery.

Vishay added that the devices feature latch-up protection greater than 300mA as tested per JESD78. They are built using Vishay's sub?m CMOS low-voltage process technology.

According to Vishay, the devices conduct signals within power rails equally well in both directions when on, and block signals up to the power supply level when off, with guaranteed break-before-make switching operation.

The analog switches are manufactured with lead (Pb)-free device terminations. The devices' miniQFN packages have nickel-palladium-gold device terminations, which meet all JEDEC standards for reflow and MSL ratings.

The switches are halogen-free according to the IEC 61249-2-21 definition and compliant to RoHS directive 2002/95/EC.

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