Texas Instruments TPS65185RSLT

Overview

TPS65185RSLT from Texas Instruments is a highly integrated power-management IC (PMIC) engineered exclusively for E Ink® Vizplex™ electronic paper displays. It delivers ±15-V source driver rails (VPOS/VNEG), ±22-V/–20-V gate driver supplies (VDDH/VEE), adjustable VCOM (0 V to –5.11 V, ±1.5% accuracy), and a 3.3-V load switch-all from a single 3-V to 6-V input. It enables stable, low-power operation in e-readers and dual-display tablets.

For engineers reviewing the TPS65185RSLT datasheet, TPS65185RSLT pinout, TPS65185RSLT application, or TPS65185RSLT equivalent, key selection considerations include its I²C-programmable VCOM calibration, active discharge on all rails, ±50-mV VPOS–VNEG tracking tolerance, and support for 9.7-inch+ E-Paper panels with automatic kickback measurement.

Technical Context

The TPS65185RSLT 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 dedicated charge pumps delivering +22 V/15 mA (CP1) and –20 V/15 mA (CP2).

Two tracking LDOs-LDO1 (15 V, 120 mA, VPOS) and LDO2 (–15 V, 120 mA, VNEG)-maintain tight output matching (±50 mV difference). A 9-bit programmable VCOM amplifier provides panel backplane biasing with ±10 mV step resolution and supports automatic kickback voltage measurement and EEPROM storage of calibration values.

Key Specifications

Pinout & Package

TPS65185RSLT uses a 48-pin RSL VQFN package (6.00 mm × 6.00 mm, 0.4-mm pitch) with an exposed thermal pad electrically connected to PBKG (Pin 22), which must be tied to the VN node (–16 V) via a short, wide copper trace for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS651851RSLT and TPS65186RSLT, the TPS65185RSLT delivers the most cost-effective solution for standard 9.7-inch E-Paper panels with ≤120 mA source driver loads, retaining full VCOM calibration, rail tracking, and I²C programmability without over-specifying current capability.

Availability

TPS65185RSLT is available at Aetrix Electronics and suitable for e-book readers, industrial electronic shelf labels, and medical handheld EPD devices requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for TPS65185RSLT 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 technologies, with decades of expertise in low-power, high-precision power solutions.

The TPS65185x product line was designed specifically to address the stringent voltage accuracy, sequencing, and calibration demands of E Ink® Vizplex™ electronic paper displays in portable and battery-constrained applications.

FAQ

What is the primary function of the TPS65185RSLT in an E-Paper system?

The TPS65185RSLT serves as a complete single-chip power-management solution for E Ink® Vizplex™ displays. It generates all required bias voltages-including ±15-V source driver rails (VPOS/VNEG), ±22-V/–20-V gate driver supplies (VDDH/VEE), digitally adjustable VCOM (0 V to –5.11 V), and a 3.3-V load switch-from a single 3-V to 6-V input. Its integrated VCOM calibration engine and rail tracking eliminate external components and manual tuning, making it essential for production-ready e-reader designs.

Does the TPS65185RSLT support automatic VCOM calibration, and how does it work?

Yes, the TPS65185RSLT supports automatic panel kickback voltage measurement via its integrated VCOM calibration engine. During initialization, it measures the panel's inherent kickback response, computes the optimal VCOM offset, and stores the result in non-volatile memory. This value becomes the default VCOM power-up setting, eliminating manual factory calibration and reducing production test time. The process is triggered and controlled entirely through the I²C interface of the TPS65185RSLT.

What are the key differences between TPS65185RSLT and TPS651851RSLT?

The TPS651851RSLT upgrades two critical parameters over the TPS65185RSLT: LDO output current increases from 120 mA to 200 mA (at VIN ≥3.6 V), and DCDC1 switch current limit rises from 1.5 A to 2.5 A. All other features-including pinout, register map, VCOM resolution, rail tracking, and package-are identical. The TPS65185RSLT remains optimal for panels with ≤120 mA source driver loads, while the TPS651851RSLT targets larger or faster-update panels requiring higher current headroom.

How does the TPS65185RSLT handle thermal management in compact e-reader designs?

The TPS65185RSLT incorporates thermal shutdown at 150°C with 20°C hysteresis and uses a thermally optimized RSL VQFN package with an exposed pad tied internally to PBKG (Pin 22). This pad must be connected directly to the VN node (–16 V) using a short, wide copper trace-leveraging the negative rail plane as a heatsink. This design allows efficient heat dissipation without requiring ground-plane isolation, making it suitable for space-constrained e-reader PCBs.

Can the TPS65185RSLT be used with panels larger than 9.7 inches?

Yes-the TPS65185RSLT is explicitly rated to support "9.7-inch and larger panel sizes" per its official datasheet. Its ±22-V/–20-V gate driver supplies (VDDH/VEE) and ±15-V/120-mA source driver rails (VPOS/VNEG) provide sufficient voltage headroom and current capability for extended E-Paper formats. However, panel-specific validation of VCOM tuning, timing margins, and thermal performance remains necessary, as actual scalability depends on the display's capacitance, update rate, and drive scheme-not just the TPS65185RSLT's rated specifications.