DESCRIPTION

The RH6105MW is a micropower, precision current sense

amplifier with a very wide input common mode range.

The RH6105MW monitors unidirectional current via

the voltage across an external sense resistor. The input

common mode range extends from –0.3V to 44V, with

respect to the negative supply voltage (V–). This allows

the RH6105MW to operate as a high side current sense

monitor or a low side current sense monitor. It also allows

the RH6105MW to monitor current on a negative supply

voltage, as well as continuously monitor a battery from

full charge to depletion. The inputs of the RH6105MW can

withstand differential voltages up to ±44V, which makes it

ideal for monitoring a fuse or MOSFET switch.

Gain is configured with external resistors from 1V/V to

100V/V. The input common mode rejection and power

supply rejection are in excess of 100dB and the input

offset voltage is less than 565μV. A typical slew rate of 2V/

μs ensures fast response to unexpected current changes.

The RH6105MW can operate from an independent power

supply of 2.85V to 36V and draws only 150μA. When V+ is

powered down, the sense pins are biased off. This prevents

loading of the monitored circuit, irrespective of the sense

voltage. The RH6105MW is available in a 10-lead bottom

brazed flat pack.

ABSOLUTE MAXIMUM RATINGS

Differential Input Voltage (+IN to –IN)......................±44V

Input Voltage V(+IN, –IN) to V– ................. –9.5V to 44V

Total V+ Supply Voltage from V–................................36V

Output Voltage.......................................V– to (V– + 36V)

Output Short-Circuit Duration (Note 3)............. Indefinite

Operating Temperature Range................–55°C to 125°C

Maximum Junction Temperature........................... 150°C

Storage Temperature Range....................–65°C to 150°C

Lead Temperature (Soldering, 10 sec)................... 300°C

(Notes 1, 2)