Texas Instruments TPS92691PWP

Overview

TPS92691PWP from Texas Instruments is a wide-input (4.5 V to 65 V), multi-topology LED controller implementing fixed-frequency peak current mode control with rail-to-rail current sense amplifier, programmable 80–700 kHz switching frequency, ±3% LED current accuracy over –40°C to 140°C, and integrated DDRV gate driver for >1000:1 PWM dimming - used in automotive exterior lighting and high-reliability architectural LED drivers.

For engineers reviewing the TPS92691PWP datasheet, TPS92691PWP pinout, TPS92691PWP application, or TPS92691PWP equivalent, key selection considerations include its 65-V rail-to-rail current sense capability, dual high-side/low-side shunt compatibility, analog dimming range (140 mV–2.25 V at IADJ), OVP threshold programmability via resistor divider, and thermal shutdown at 175°C with 25°C hysteresis.

Technical Context

The TPS92691PWP uses a fixed-frequency peak current mode architecture with slope compensation and soft-start timing, enabling stable constant-current regulation across boost, buck, and buck-boost topologies. Its transconductance error amplifier (121 µA/V) compares amplified current sense voltage (CSP–CSN ×14) against IADJ reference to generate COMP output for duty-cycle control.

It integrates two independent gate drivers: GATE (500 mA peak source/sink, RGH=5.4 Ω typ) for main power switch control, and DDRV (500 mA peak, RDH=6.1 Ω typ) for external series N-FET dimming. The rail-to-rail current sense amplifier operates with cumulative offset <±5.9 mV over full temperature and common-mode range (0–60 V), supporting both high-side and low-side sensing configurations.

Key Specifications

Pinout & Package

TPS92691PWP is housed in a 16-pin HTSSOP package (5.10 mm × 6.60 mm) with exposed PowerPAD™ thermal pad requiring multiple vias to PCB ground plane for thermal performance (R_θJA = 40.8°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS92691PWP, the TPS92691-Q1PWP adds automotive qualification without altering functionality, while the LM3410XMF/NOPB sacrifices programmability, diagnostics, and topology flexibility for integration and cost reduction in simpler applications.

Availability

TPS92691PWP is available at Aetrix Electronics and suitable for automotive exterior lighting, architectural LED drivers, industrial signage, and medical illumination requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS92691PWP 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 and embedded processing technologies, with leadership in power management, signal chain, and high-reliability ICs.

The TPS92691PWP belongs to TI's high-performance LED controller product line, designed specifically for multi-topology, high-accuracy, and fault-resilient constant-current LED driving in demanding automotive and industrial environments.

FAQ

What is the maximum output voltage supported by the TPS92691PWP in boost configuration?

The TPS92691PWP supports an output voltage range of 2 V to 65 V. In boost configuration, the maximum output is limited by external component ratings and the 65-V absolute maximum rating on CSP/CSN pins. The device's rail-to-rail current sense amplifier enables accurate regulation up to 60 V common-mode voltage, making it suitable for driving 15–20 white LEDs in series. Always verify external MOSFET, diode, and capacitor voltage ratings exceed 65 V for safety margin. The TPS92691PWP itself does not regulate beyond its internal voltage limits.

Can the TPS92691PWP operate with a low-side current sense configuration?

Yes, the TPS92691PWP fully supports low-side current sensing using the CSP and CSN inputs. Its rail-to-rail current sense amplifier accepts common-mode voltages from 0 V to 60 V, allowing direct connection across a ground-referenced sense resistor. This configuration simplifies layout and improves noise immunity in buck topologies. Ensure the sense resistor is placed between LED cathode and PGND, with CSN tied to PGND and CSP to the resistor's high side. The TPS92691PWP maintains ±3% LED current accuracy regardless of high-side or low-side placement.

How is LED current adjusted using the IADJ pin on the TPS92691PWP?

The IADJ pin on the TPS92691PWP is a high-impedance (90 nA bias) analog input that sets the LED current sense threshold. Applying 0.14 V to 2.25 V yields a linear 15:1 dimming range - e.g., 0.14 V corresponds to ~10% full-scale current, and 2.25 V to 100%. Internally, this voltage establishes the reference for the transconductance error amplifier. For calibration, a precision DAC or trimmed potentiometer is recommended. The TPS92691PWP's IADJ clamp (2.27–2.55 V) prevents overrange, and its low bias current avoids loading typical voltage sources.

Does the TPS92691PWP provide built-in protection against LED open or short circuits?

Yes, the TPS92691PWP provides LED fault detection via the IMON pin, which outputs V_IMON = 14 × I_LED × R_CS. An open LED causes IMON to drop near 0 V; a short causes unregulated current and triggers cycle-by-cycle IS limit or thermal shutdown. Additionally, OVP protection responds to output overvoltage (e.g., from open LED in boost), and the SS pin allows remote shutdown. These features enable autonomous fault response without external monitoring. The TPS92691PWP's integrated diagnostics reduce system-level BOM cost and improve field reliability.

What thermal management requirements apply to the TPS92691PWP in continuous operation?

The TPS92691PWP requires proper thermal design due to its 40.8°C/W junction-to-ambient thermal resistance in the HTSSOP package. The exposed PowerPAD™ must be soldered to a PCB ground plane with ≥4 thermal vias (0.3-mm diameter) to minimize R_θJB (22.2°C/W). At 140°C max junction temperature and 25°C ambient, continuous power dissipation should remain below 2.8 W. Derate linearly above 25°C ambient. Thermal shutdown activates at 175°C with 25°C hysteresis. The TPS92691PWP's thermal protection is internal and non-latching - recovery occurs after cooldown.