IC-JJ Datasheet, PDF (2/17 Pages) IC-Haus GmbH – POWER MANAGEMENT iC

iC-JJ
POWER MANAGEMENT IC
Rev A1, Page 2/17
GENERAL DESCRIPTION
Monolithic device iC-JJ supplies electronic systems from a single input voltage VBAT (6V to 16.5V) with
voltages which range from 5V to 48V. The autarky function guarantees that the output voltages are maintained
for up to several hundred milliseconds, even after the input voltage has been aborted.
A step-up converter produces a voltage of VBAT+2V to 48V, whose setpoint is adjusted via two external
resistors at VA1x. Two 5V linear regulators provide 200mA (VCC) and 60mA (VREF). Alternatively, 260mA
are available from the 6V step-down converter (VH) whose switching frequency is generated by an integrated
120kHz oscillator. An additional tristate-competent output provides 12V to 30mA and can be activated via a
control input for writing data to EEPROMs, for example.
The integrated low voltage and autarky detection function indicates at the error message outputs VTU and
NVTA when the relevant low voltage thresholds are reached; there are two different error message outputs
for this purpose. The error message is deleted by an external low signal and not when the supply voltage rises
again. Information on temporary voltage drops is retained.
If the autarky voltage threshold is undershot, the iC automatically switches into autarky mode. This mode can
also be simulated in order to test the autarky capacitor CVA.
Integrated high- and low-side drivers permit various loads to be connected, such as panel indicators (visual
monitors), for example. The drivers are switched via control inputs and status outputs are signaling the current
switching state back to the controller.
iC-JJ monitors the chip temperature; with excessive temperature the high- and low-side drivers are switched
off to reduce the power dissipation.
The integrated watchdog can monitor the correct operation of an external processor. If used, the bi-directional
serial communication interface connects the chip with external diagnosis components. The iC can be switched
to standby via the input ENA and then draws a low standby current of typically 30 µA.
The device is protected against destruction due to ESD.