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)