MAX351ESE

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The MAX351ESE device is a low voltage and low power, quad single-pole/single-throw (SPST), analog switch designed for analog and mixed-signal signal routing applications. It provides an optimal combination of low on-resistance and low power consumption, with very low charge injection.

The MAX351ESE is suitable for applications operating from a single 3.0V to 5.5V supply voltage, over full temperature range. The device is ideal for use in cost-sensitive, portable applications, especially those powered with batteries.

The MAX351ESE has four independently controlled switches. These switches feature low on-state resistance (Ron) of 20Ω max, high off-state resistance (Roff) of 2MΩ, low break-before-make propagate delay and low charge injection. The max Ron is 5Ω for VDD as low as 2.7V. The device also has a fast switch enable time of 5ns, high power-supply-rejection ratio (PSRR) of 74dB allows reliable switch operation, even in noisy supply situations.

Applications for the MAX351ESE include the following: analog and digital signal routing, HPLC switchboxes, switching for capacitive load applications and multiplexers, single active channel selection, instrument, testing and control circuitry, switch matrices, low voltage systems, pneumatics systems and transducer protections.

Working Principle

The MAX351ESE’s low voltage/low power design is enabled by the use of thin-film-resistive elements which are integrated directly into the device’s aluminum bridge (A-bridge) structure. Its on-state resistance at 3.3V supply voltage is typically 0.8Ω, while the low Ron enables the inversion of medium capacitive loads, up to 200pF. During operation, a gate voltage (VGS) is applied to the pins labeled S and D, making it possible to switch from a high impedance state (Roff) to a low impedance state (Ron). VGS must be higher than the power supply voltage for the channel to be in the Roff state. The gate voltage must be lower than the power supply voltage for the selected channel to be in the Ron state.

The use of the thin-film-resistive element also ensures the low power consumption of the MAX351ESE. With a supply voltage of 3.3V, the quiescent current is only 0.2µA, extreme low compared to other switch devices. The power-down mode helps reduce the power disipation to 0.1µA. With an operating temperature range of -40°C to +85°C, this device works with low self-heating.

The MAX351ESE was designed with lead-free technology. Its package is halogen-free and compliant with JEDEC-208C SHRM (Surface Reject Metallization) and 4F3A solder ball standard, making this device suitable for high-volume, low-cost applications. It is also available in an 8-pin TDFN package.

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