L9386MD-TR STMICROELECTRONICS | Alldatasheet
Document overview
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- PDF pages: 14
Technical content
Datasheet sections
- 1 Block and pins connection diagrams
- 2 Electrical specifications
- 2.1 Absolute maximum ratings
- 2.2 Thermal data
- 2.3 Electrical characteristics
- 2.4 Circuit description
- 3 Package information
- 4 Revision history
Features
■ Multipower BCD technology ■ Dual power low side driver with 2 x 5 A ■ Low RDSON typically 200 mΩ @ TJ = 25 °C ■ Internal output clamping diodes VFB = 50 V for inductive recirculation ■ Limited output voltage slew rate for low EMI ■ µP compatible enable and input ■ Wide operating supply voltage range 4.5 V to 45 V ■ Real time diagnostic functions: – Output shorted to GND – Output shorted to V SS – Open load – Load bypass – Over temperature ■ Device protection functions: – Overload disable – Reverse battery up to -16 V @ V S – Thermal shutdown
Description
The L9386 is a monolithic integrated dual low side driver realized in an advanced Multipower BCD mixed technology. It is especially intended to drive valves in automotive environment. Its inputs are µP compatible for easy driving. Particular care has been taken to protect the device against failures, to avoid electro-magnetic interferences and to offer extensive real time diagnostic. SO20 Table 1. Device summary
1 Block and pins connection diagrams
Figure 1. Block diagram Figure 2. Pins connection (top view)
2 Electrical specifications
2.1 Absolute maximum ratings
2.2 Thermal data
Table 2. Absolute maximum ratings (no damage or latch) Table 3. Thermal data
2.3 Electrical characteristics
Table 4. Electrical characteristics
- 6.5 V ≤ VS ≤ 16 V (Diagnostic operation range).
- 4.5 V ≤ VS < 6.5 V and 16 V < VS ≤ 32 V (Extended operation range).
- 9 V ≤ VS ≤ 16 V (Nominal operating range)
Table 4. Electrical characteristics (continued) Table 5. Diagnostic table (operating range: 4.5 V ≤ VS ≤ 32 V)
- If one diag. status shows the overtemper ature recognition, in parallel this output will be switched OFF internally. The
Figure 5. Open load voltage detection block diagram
Figure 6. Logic diagram
Electrical specifications L9386
2.4 Circuit description
The L9386 is a dual low side driver for inductive loads like valves in automotive environment. The device is enabled by a common CMOS compatible ENABLE high signal. The internal pull down current sources at the ENABLE and INPUT pins protect the device in open input conditions against malfunctions. An output slope limitation for du/dt is implemented to reduce the EMI. An integrated active flyback voltage limitation clamps the output voltage during the flyback phase to 50V. Each driver is protected against short circuit and thermal overload. In short circuit condition the output will be disabled after a short delay time t DOL to suppress spikes. This disable is latched until a negative slope occur at the correspondent input pin. The thermal disable for T J > 175 °C of the output will be resetted if the junction temperature decreases about 20 °C below the disable threshold temperature. For the real time error diagnosis the voltage and the current of the outputs are compared with internal fixed values VOUV for OFF and IOUC for ON conditions to recognize open load (RL ≥ 20 kΩ, RL > 38Ω) in ON and OFF conditions. The diagnostic operates also in the extended supply voltage range of 4.5 V ≤ VS ≤ 32 V. Also the output voltages VO1,2 are compared against each other in OFF condition with a fixed offset of ΔVOUV 1,2 to recognize GND bypasses. To suppress mail ΔVO diagnoses during the flyback phases of the compared output, the ΔVO diagnostic includes a latch function. Reaching the flyback clamping voltage VOC the diagnostic signal is resetted by a latch. To activate again this kind of diagnostic a low signal at the correspondent INPUT or the ENABLE pin must occur (see also Figure 5). The diagnostic output level in connection with different ENABLE and INPUT conditions allows to recognize different fail states, like overtemperature, short to VSS, short to GND, bypass to GND and disconnected load (see also Table 5 on page 6). The diagnostic output is also protected against short to UD max. Oversteping the over load current threshold IOo, the output current will be limited internally during the diagnostic overload delay switch-off time tDOL. Obsolete Product(s) - Obsolete Product(s)
Figure 7. Open load voltage detection block diagram
3 Package information
ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. Figure 8. SO20 mechanical data and package dimensions
4 Revision history
Table 6. Document revision history 16-Jan-2002 1 Initial release. 20-Sep-2003 2 Changed company name and logo. 16-Jul-2008 3 Document reformatted. Added Table 1: Device summary on page 1.