Texas Instruments LM36923HEVM

Overview

LM36923HEVM from Texas Instruments is an evaluation module designed to validate the LM36923H triple-string white LED driver IC in backlight applications. It supports 1–3 parallel LED strings with configurable series counts (3–13 LEDs/string), delivers up to 21 lumens per dual-LED package, and enables full I²C register control via USB2ANY interface and GUI software.

For engineers reviewing the LM36923HEVM datasheet, LM36923HEVM pinout, LM36923HEVM application, or LM36923HEVM equivalent, this EVM provides hands-on validation of LED current regulation, fault flag monitoring, PWM dimming, ASEL address selection, and macro-driven register programming for display backlight systems.

Technical Context

The LM36923HEVM implements a complete test platform for the LM36923H - a highly efficient boost-based white LED driver with integrated 4.7 µH shielded inductor (L1), input voltage range of 2.5 V to 5.5 V, and programmable LED current up to 30 mA per string. It includes on-board dual-LED arrays (Samsung SPMWHT325AD5YBTMS0) and single-LED options (Rohm SML312WBCW1) for flexible string configuration.

Hardware control is enabled through dedicated jumpers for HWEN (hardware enable), ASEL (I²C slave address), PWM input source selection, and OUT (LED string connection/disconnection), while real-time diagnostics include per-string current sensing (10 Ω sense resistors RL1–RL3) and fault register readback via GUI.

Key Specifications

Availability

LM36923HEVM is available at Aetrix Electronics and suitable for display backlight development, LED driver qualification, and embedded lighting system prototyping requiring stable component supply and full-feature hardware validation.

Supply support for LM36923HEVM 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 specializing in analog, embedded processing, and power management technologies, with decades of leadership in LED driver and power conversion solutions.

The LM36923HEVM belongs to TI's backlight evaluation platform family, engineered specifically to accelerate design-in of high-efficiency, I²C-configurable white LED drivers for LCD displays and portable visual interfaces.

FAQ

What is the primary function of the LM36923HEVM?

The LM36923HEVM is an evaluation module that enables hardware and firmware validation of the LM36923H triple-string white LED driver IC. It provides physical access to all control signals (HWEN, ASEL, PWM), on-board LED strings, current sensing, and full I²C register interaction via TI's GUI software - allowing engineers to verify timing, regulation accuracy, fault response, and configuration flexibility before final design integration.

Does the LM36923HEVM include the LM36923H IC?

Yes, the LM36923HEVM includes one LM36923H IC (Texas Instruments part number LM36923HYFFR) mounted in a 0.4 mm-pitch, 12-bump DSBGA package (U1). This is the exact device under evaluation - not a placeholder or generic controller - and is fully functional with all features accessible via jumpers, connectors, and GUI interface.

How is I²C communication implemented on the LM36923HEVM?

I²C communication on the LM36923HEVM is implemented through the USB2ANY interface board and TI's LM36923H GUI software. The EVM exposes SDA/SCL pins and supports two I²C slave addresses (0x36 or 0x37) selected via the ASEL jumper or GUI setting. Pull-up resistors (RSCL/RSDA, 4.7 kΩ) are onboard, and VIO can be sourced from VIN or USB2ANY's 3.3 V line depending on system voltage requirements.

Can the LM36923HEVM drive custom LED modules?

Yes, the LM36923HEVM supports external LED modules via its OUT connector, which provides direct access to the regulated output of each LED string. By removing the OUT jumper, users can disconnect the onboard LEDs and connect third-party LED strips or panels while retaining full current regulation, fault monitoring, and I²C control - provided the external load stays within the LM36923H's voltage and current specifications.

What software tools are required to operate the LM36923HEVM?

Operation of the LM36923HEVM requires TI's LM36923H GUI software (distributed with the User's Guide SNVU509) and the USB2ANY interface board firmware. The GUI enables register-level read/write, macro scripting, PWM generation, ASEL configuration, and fault flag inspection. Firmware updates for USB2ANY are handled automatically by the GUI when version mismatches are detected.