CH704

Description

The device consists of a precise, low-offset, linear Hall sensor circuit with a copper conduction path 

located near the surface of the die. Applied current flowing through this copper conduction path 

generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional 

voltage. A precise, proportional voltage is provided by the low-offset, chopper-stabilized Hall IC, which 

is programmed for accuracy after packaging. The output of the device has a positive slope when an 

increasing current flow through the primary copper conduction path, which is the path used for current 

sensing. 

The terminals of the conductive path are electrically isolated from the sensor leads. This allows the 

CH704 current sensor IC to be used in high-side current sense applications without the use of highside differential amplifiers or other costly isolation techniques.

The lead-frame is plated with 100% matte tin, which is compatible with standard lead (Pb) free printed 

circuit board assembly processes. Internally, the device is Pb-free, except for flip-chip hightemperature Pb-based solder balls, currently exempt from RoHS. The device is fully calibrated prior to 

shipment from the factory.

Features Package

• Reinforced isolation: 4800VRMS

• AEC-Q100 qualified

• Single supply: 4.5-5.5V

• Output voltage proportional to AC current:

+/-50A, +/-100A, +/-150A, +/-200A

• Bandwidth: 180 kHz

• Response time: < 2µs

• Wide temperature range: -40

oC to 150oC

• High resolution offset and sensitivity trimming with EEPROM

• Primary conductor resistance: 0.1 mΩ

• Integrated protections

o Under-voltage protection

o Output voltage clamp provides short circuit diagnostic

o Output spiking suppress during fast current step inputs

• Factory programmed sensitivity and quiescent output voltage 

TC

• Integrated digital temperature compensation circuitry

• Nearly zero magnetic hysteresis

• Ratio-metric output from supply voltage

• Immunity to external magnetic field

Application

• UPS current sensing

• DC-to-DC converter control

• Balance bike motor control

• Overcurrent fault detection