STMicroelectronics ISO808

The ISO808, ISO808-1 (PowerSO-36) and ISO808Q, ISO808Q-1 (TFQFPN32) are galvanic isolated 8-channel drivers featuring a low supply current. Each driver contains 2 independent galvanic isolated voltage domains (VCC and VDD for the Process and Control Logic stages, respectively). The ICs are intended for driving any kind of load with one side connected to ground.

Active channel current limitation (OVL) combined with thermal shutdown (OVT), independent for each channel, protects the device against overload.

Built-in thermal shutdown protects each channel from overtemperature and overload: each overheated channel automatically turns OFF after its junction temperature triggers the protection threshold (TJSD). The channel turns back ON if its junction temperature decreases lower than restart threshold (TJR).

An additional case temperature sensor protects the whole chip against overtemperature (OVC event): if the case temperature triggers the TCSD threshold then overloaded channels are turned OFF and restart only when case temperature decreased down to the reset threshold (TCR). Non overloaded channels continue to operate normally.

Other embedded functions are loss of ground protection, VCC and VDD UVLOs (with hysteresis), and watchdog.

An internal circuit provides an OR-wired not latched OVT that is reported on the common FAULT indicator pin. FAULT is an open drain, active low, fault indication pin.

The Synchronous Control Mode (by driving SYNC and LOAD pins independently) is used to reduce the jittering of the outputs and to drive at the same time the outputs of different devices.

• V_CC(AMR) =
  45 V
• Wide process side op. range V_CC = 9.2 to 36 V
• R_DS(on)  = 0.125 Ω per channel (TYP)
• Fast demagnetization of inductive loads V_DEMAG(TYP) = V_CC - 54 V
• Per channel process side op. current
  • ISO808/ISO808Q I_OUT < 0.7 A
  • ISO808-1/ISO808Q-1 I_OUT < 1 A
• Low process and logic sides supply current
• Under-voltage shut down with auto restart and hysteresis
• Logic side 5 V and 3.3 V TTL/CMOS and MCU compatible I/Os
• Common output enable/disable pin
• Reset function for IC outputs disable
• High common mode transient immunity
• Short circuit protection on output channels
  • ISO808/ISO808Q I_LIM(MIN) = 0.7 A
  • ISO808-1/ISO808Q-1 I_LIM(MIN) = 1 A
• Per-channel over-temperature protection with thermal independence of separate channels
• Case over-temperature protection
• Over-voltage protection (V_CC
  clamping)
• Loss of GND and V_CC protections
• Common fault open drain diagnostic
• Designed to meet IEC 61000-4-2, IEC 61000- 4-4, IEC 61000-4-5 and IEC 61000-4-8
• UL1577 and UL508 certified
• Safety limits according to IEC 60747-17 (former VDE 0884-11)
• PowerSO-36 and TFQFPN32 Package