Texas Instruments TPS65185RSLR

Overview

TPS65185RSLR from Texas Instruments is a highly integrated PMIC engineered specifically for E Ink® Vizplex™ electronic paper displays, delivering ±15-V LDO source driver rails (VPOS/VNEG), ±22-V/–20-V charge pump gate supplies (VDDH/VEE), and programmable 0 V to –5.11 V VCOM bias with ±1.5% accuracy - all from a single 3 V to 6 V input. It supports 9.7-inch+ panels in e-readers and dual-display tablets.

For engineers reviewing the TPS65185RSLR datasheet, TPS65185RSLR pinout, TPS65185RSLR application, or TPS65185RSLR equivalent, key selection considerations include its I²C-programmable VCOM calibration, active discharge on all rails, integrated 3.3-V load switch, and thermal management via PBKG-connected thermal pad - critical for stable EPD panel biasing and production-line VCOM auto-calibration.

Technical Context

The TPS65185RSLR integrates two high-efficiency DC-DC converters: a boost regulator (DCDC1) generating +16 V base rail for VDDH charge pump, and an inverting buck-boost (DCDC2) generating –16 V base rail for VEE charge pump. Both feed adjustable LDOs (VPOS/VNEG) with ±50 mV tracking tolerance and dedicated charge pumps delivering up to 22 V / –20 V at 15 mA.

Its VCOM driver uses 9-bit I²C control (10-mV step) with ±1.5% accuracy and supports automatic kickback voltage measurement for factory VCOM calibration storage in non-volatile memory. All output rails feature independent enable/discharge pins (e.g., VPOS_DIS, VEE_DIS) and power-good monitoring with 50-ms timeout.

Key Specifications

Pinout & Package

TPS65185RSLR is housed in a 48-pin RSL VQFN package (6.00 mm × 6.00 mm, 0.4-mm pitch) with exposed thermal pad electrically connected to PBKG pin and intended to be soldered to VN (–16 V) net for optimal heat transfer.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar E-Paper display power management applications.

Compared with TPS651851RSLR and MAX17135ETJ+, the TPS65185RSLR offers optimal balance of cost, integration, and production-ready VCOM automation - making it the preferred choice for new e-reader designs targeting ≤120 mA panel current and automated factory calibration.

Availability

TPS65185RSLR is available at Aetrix Electronics and suitable for e-reader power systems, EPD panel biasing circuits, and OMAP-based display controllers requiring stable component supply, long-term lifecycle support, and traceable sourcing for medical and industrial deployments.

Supply support for TPS65185RSLR 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 leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in low-power display power solutions.

The TPS65185 product line was designed exclusively for E Ink Vizplex electronic paper displays, integrating all necessary bias rails, VCOM control, and production-calibration features into a single compact package.

FAQ

What is the primary function of the TPS65185RSLR in an E Ink display system?

The TPS65185RSLR serves as a complete power-management IC for E Ink Vizplex panels, generating all required bias voltages: ±15-V source driver rails (VPOS/VNEG), ±22-V/–20-V gate driver supplies (VDDH/VEE), and a programmable 0 V to –5.11 V VCOM backplane voltage. Its integrated I²C interface enables full rail configuration and auto-calibration, eliminating need for external controllers or discrete regulators in TPS65185RSLR-based designs.

Does the TPS65185RSLR support automatic VCOM calibration, and how does it work?

Yes, the TPS65185RSLR supports automatic VCOM calibration via integrated kickback voltage measurement. During initialization, it measures panel-specific kickback response, computes optimal VCOM offset, and stores the value in non-volatile memory. On subsequent power-ups, TPS65185RSLR loads this calibrated value as default - removing manual trim steps and ensuring consistent image quality across production units without external test equipment.

What are the key differences between TPS65185RSLR and TPS651851RSLR?

The TPS651851RSLR upgrades LDO output current to 200 mA (vs. 120 mA in TPS65185RSLR) and increases DCDC1 switch current limit to 2.5 A (vs. 1.5 A). Both share identical pinout, I²C register map, and VCOM functionality. TPS65185RSLR remains optimal for panels drawing ≤120 mA; TPS651851RSLR is required only when higher source driver current or gate pulse energy is needed - confirmed by panel datasheet requirements before selecting TPS65185RSLR.

How does the thermal design of the TPS65185RSLR package impact system reliability?

The TPS65185RSLR's RSL package features an exposed thermal pad electrically connected to PBKG, which must be routed to the VN (–16 V) net using a short, wide copper trace. This achieves R_θJB = 5.1°C/W, allowing >1 W continuous power dissipation with standard 2-oz PCB copper. Proper implementation prevents junction temperatures exceeding 125°C under full load - critical for sustained EPD refresh cycles and long-term reliability in sealed e-reader enclosures where airflow is absent.

Can the TPS65185RSLR's VCOM output be used for panels other than E Ink Vizplex?

The TPS65185RSLR's VCOM driver is optimized for E Ink Vizplex panels, with design parameters (e.g., ±1.5% accuracy, 0 V to –5.11 V range, 9-bit resolution) aligned to Vizplex's electrical specifications. While it may technically supply bias to other EPD types, its auto-kickback calibration, timing behavior, and register mapping assume Vizplex waveform protocols. For non-Vizplex panels, verify compatibility with panel manufacturer - TPS65185RSLR is not characterized or guaranteed for non-Vizplex use cases.