STMicroelectronics L9822EPD

Overview

L9822EPD from STMicroelectronics is an octal low-side solenoid driver IC in PowerSO-20 package, featuring eight 0.5 Ω (at 1 A, 25°C) DMOS outputs, SPI serial interface, and real-time diagnostic feedback via 8-bit serial output. It delivers fault detection for open-circuit and overload conditions, internal 36 V clamping per output, and chip-enable–controlled data latching-designed for automotive body control modules driving solenoids, relays, and lamps.

For engineers reviewing the L9822EPD datasheet, L9822EPD pinout, L9822EPD application, or L9822EPD equivalent, key selection criteria include R_DS(on) stability across temperature, SPI timing compliance (2 MHz max), diagnostic bit correlation with output voltage sense thresholds (1.6–2 V), and thermal resistance (R_{th j-case} = 1.5 °C/W) for high-density PCB layouts.

Technical Context

The L9822EPD integrates three core functional blocks: an 8-bit SPI shift register for serial command ingestion, a parallel latch for output state retention, and eight independent DMOS power stages with integrated current limiting (≥1.05 A), 36 V clamp zeners, and voltage comparators monitoring output saturation (V_OREF = 1.6–2 V).

Fault handling is synchronized to CE transitions: on CE falling edge, diagnostic bits (reflecting real-time output voltage status) load into the shift register; on CE rising edge, new control data latches to outputs after a 75–250 µs fault-reset delay (t_UD), during which analog current limiting remains active while digital fault reset is inhibited.

Key Specifications

Pinout & Package

Package: PowerSO-20 (JEDEC MO-166), surface-mount, thermally enhanced with exposed die pad for direct PCB heatsinking (R_{th j-case} = 1.5 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal low-side driver applications.

Compared with TPL9201IPWPR and TPIC6B595N, the L9822EPD uniquely combines low R_DS(on), integrated 36 V clamping, and hardware-diagnostic SPI feedback-making it the only option qualified for automotive-grade solenoid control requiring zero external protection components and closed-loop fault verification.

Availability

L9822EPD is available at Aetrix Electronics and suitable for automotive body control modules, industrial valve sequencers, commercial lighting systems, and appliance motor controllers requiring stable component supply across extended temperature ranges (–40°C to 125°C) and long production lifecycles.

Supply support for L9822EPD includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with broad manufacturing and quality certifications including AEC-Q100.

The L9822EPD belongs to ST's Automotive Power Drivers product line, engineered specifically for robust, fault-tolerant control of inductive loads in harsh environments-emphasizing integrated protection, diagnostic visibility, and thermal resilience.

FAQ

What is the maximum continuous current per channel on the L9822EPD?

The L9822EPD guarantees ≥1.05 A continuous output current per channel under all operating conditions (T_j ≤ 150°C, V_CC = 5 V). This is enforced by internal analog current limiting-distinct from the 0.55 Ω R_DS(on) specification, which defines conduction loss at 1 A, not absolute current rating.

How does the diagnostic feedback work during open-circuit detection?

When an output is programmed OFF and the pin is open-circuited, the internal pull-down current in the voltage comparator forces the diagnostic bit to read LOW (0). If the same bit reads HIGH (1) while OFF, it indicates the pin is shorted to V_BAT or overloaded-enabling unambiguous open vs. short discrimination without external circuitry.

Can multiple L9822EPD devices be cascaded on a single SPI bus?

Yes-the SO pin of one L9822EPD connects directly to the SI pin of the next device. With CE lines independently controlled, up to N devices can share SCLK and SI, forming an N×8-bit daisy chain. Diagnostic data flows back through the chain in reverse order, preserving channel mapping.

Is external heat sinking required for full-power operation?

No external heatsink is required if the PowerSO-20 exposed pad is soldered to ≥250 mm² of 2-oz copper on an inner layer. At 500 mA/channel and 125°C ambient, junction temperature remains ≤145°C (within 150°C limit) using only PCB thermal conduction-verified by R_{th j-amb} = 60 °C/W data.