Texas Instruments LP8862QPWPRQ1

Overview

LP8862QPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LED driver IC with integrated boost/SEPIC DC-DC converter, two 160-mA precision current sinks, 1% typical current matching, 10,000:1 PWM dimming ratio at 100 Hz, and adaptive output voltage control up to 45 V - used in instrument cluster backlighting requiring high reliability under 4.5–40 V input transients.

For engineers reviewing the LP8862QPWPRQ1 datasheet, LP8862QPWPRQ1 pinout, LP8862QPWPRQ1 application, or LP8862QPWPRQ1 equivalent, key selection criteria include VIN operating range (4.5–40 V), dual-channel current sink accuracy (±5% max error), spread-spectrum EMI reduction, fault detection coverage (open/short LED, OVP/UVLO/OCP, thermal shutdown), and HTSSOP-20 package thermal performance (RθJA = 44.2°C/W).

Technical Context

The LP8862QPWPRQ1 implements a current-mode boost/SEPIC controller with adaptive output voltage regulation based on real-time LED headroom sensing, minimizing power loss across varying string configurations. Its switching frequency is resistor-programmable from 300 kHz to 2.2 MHz via RFSET, and supports external synchronization (300–2200 kHz) with automatic fallback to internal frequency if SYNC is lost.

Two independent analog current sinks (OUT1/OUT2) deliver up to 160 mA each with 1% typical matching and 0.4–0.7 V saturation voltage at full load. The device integrates an internal LDO (4.3 V ±0.15 V) for digital I/O supply, power-line FET control (SD pin) for inrush limiting and fault isolation, and comprehensive protection including open/short LED detection, VIN OVP (42 V typ), UVLO (4.0 V), OCP (3.2 A typ), and thermal shutdown (165°C typ).

Key Specifications

Pinout & Package

LP8862QPWPRQ1 uses a thermally enhanced HTSSOP-20 package (6.50 mm × 4.40 mm) with exposed thermal pad (EP) for improved power dissipation. Pin functions are validated per TI SNVSA75D datasheet Rev D (May 2017).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED driver applications.

Compared with LP8862QPWPRQ1, LP8860QPWPRQ1 adds channel count but removes SEPIC flexibility, while TPS61194QPWPRQ1 trades analog simplicity and EMI robustness for digital configurability - making LP8862QPWPRQ1 optimal for dual-string, high-reliability, low-EMI automotive backlighting where minimal external components and autonomous protection are critical.

Availability

LP8862QPWPRQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, heads-up displays, smart mirrors, and central information displays requiring stable component supply across extended temperature ranges and automotive qualification.

Supply support for LP8862QPWPRQ1 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

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and automotive ICs with broad manufacturing scale and automotive AEC-Q100 validation infrastructure.

The LP8862QPWPRQ1 belongs to TI's automotive LED driver product line, designed specifically for high-reliability, low-EMI backlighting in safety-critical driver information systems - emphasizing adaptive voltage control, fault resilience, and seamless integration into 12-V/48-V vehicle electrical architectures.

FAQ

What is the maximum LED string voltage supported by the LP8862QPWPRQ1?

The LP8862QPWPRQ1 supports a maximum DC-DC output voltage of 45 V, set via the FB pin resistive divider. This allows driving LED strings with total forward voltage up to approximately 40 V (accounting for 0.4–0.7 V sink saturation), making it suitable for 10–12 white LEDs in series under automotive conditions. The adaptive voltage control dynamically adjusts this output to the minimum required headroom, improving efficiency.

Does the LP8862QPWPRQ1 support both boost and SEPIC topologies?

Yes, the LP8862QPWPRQ1 supports both boost and SEPIC modes via its integrated DC-DC controller. SEPIC operation is enabled by appropriate external component selection (coupled inductor or separate L/C configuration) and is explicitly documented in the TI SNVSA75D datasheet. This dual-mode capability allows safe operation when input voltage may exceed output voltage - critical for automotive systems with wide VIN ranges.

How does the adaptive output voltage control in the LP8862QPWPRQ1 improve system efficiency?

The LP8862QPWPRQ1 continuously monitors LED current sink headroom voltage and dynamically adjusts the DC-DC output to the lowest level sufficient to maintain regulation. This reduces power dissipation in the current sinks - especially at low brightness or low ambient temperature - resulting in up to 15% higher system efficiency compared to fixed-output designs, as confirmed in TI's typical characteristics (Figure 10, SNVSA75D).

Can the LP8862QPWPRQ1 drive more than two LED strings?

No, the LP8862QPWPRQ1 has exactly two dedicated current sinks (OUT1 and OUT2), each configurable up to 160 mA. While multiple LEDs can be connected in series per channel, the IC does not support additional independent strings. For >2 strings, TI recommends LP8860QPWPRQ1 (4-channel) or parallel use of LP8862QPWPRQ1 devices with synchronized PWM inputs - though the latter requires careful thermal and layout management.

What fault conditions trigger the FAULT pin assertion in the LP8862QPWPRQ1?

The FAULT pin on the LP8862QPWPRQ1 asserts low for open-string detection, shorted-LED detection, VIN overvoltage (≥42 V), VIN undervoltage (≤4.0 V), VIN overcurrent (≥3.2 A), and junction temperature exceeding 165°C. Each condition is independently monitored in hardware; the pin remains asserted until the fault clears and the device resets - either automatically after recovery or via toggling VDDIO/EN.