Texas Instruments TPS65105RGERG4

Overview

TPS65105RGERG4 from Texas Instruments is a triple-output LCD power supply IC integrating a 1.6-MHz boost converter (VO1 up to 15 V / 350 mA), a negative charge pump (VO2 down to –12 V / 20 mA), a positive charge pump (VO3 up to 30 V / 20 mA), an integrated VCOM buffer, and a 3.3-V linear regulator controller - all in a single VQFN-24 package. It delivers precise, sequenced bias voltages for TFT LCD source/gate drivers and backplane control in portable displays.

For engineers reviewing the TPS65105RGERG4 datasheet, TPS65105RGERG4 pinout, TPS65105RGERG4 application, or TPS65105RGERG4 equivalent, key selection considerations include its 1.37-A internal switch current limit (vs. 2.3-A in TPS65100/01), fault-protection shutdown behavior, VQFN-24 thermal performance (RθJA = 33°C/W), and support for voltage doubler/tripler charge pump modes via C2-/MODE pin configuration.

Technical Context

The TPS65105RGERG4 implements Virtual Synchronous Converter Technology in its main boost stage, enabling continuous conduction mode across full load range using an external Schottky diode and internal P-MOSFET (rDS(on) = 9–22 Ω) - eliminating light-load ringing and simplifying compensation. Its 1.6-MHz fixed-frequency operation allows use of small 4.7-µH inductors and 220-nF flying capacitors.

All three regulated outputs (VO1, VO2, VO3) are monitored for over/undervoltage faults; the TPS65105 enters full shutdown on any output fault, unlike the TPS65101. Power-on sequencing is hardware-controlled: VO1 rises first, followed by VO2 (at 91% of target), then VO3 (at 91% of target), and finally VCOM (when VCOMIN > 1.0 V and VO3 is stable).

Key Specifications

Pinout & Package

TPS65105RGERG4 is housed in a 4.00 mm × 4.00 mm VQFN-24 package with exposed thermal pad (PowerPAD™), optimized for low thermal resistance (RθJA = 33°C/W, RθJB = 10.7°C/W). The package requires soldering the thermal pad to PGND for reliable thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LCD power supply applications.

Compared with TPS65100RGER and TPS65101RGER, the TPS65105RGERG4 offers lower switch current (1.37 A) and mandatory fault shutdown - making it optimal for cost-sensitive, medium-power portable displays where reliability and compact magnetics are prioritized over maximum output current.

Availability

TPS65105RGERG4 is available at Aetrix Electronics and suitable for TFT LCD notebooks, portable DVD players, and automotive infotainment displays requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS65105RGERG4 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 display power solutions.

The TPS6510x product line was designed specifically for compact, high-efficiency bias generation in TFT LCD systems - integrating boost, dual charge pumps, VCOM buffering, and LDO control to replace multi-chip discrete solutions.

FAQ

What is the function of the C2-/MODE pin on the TPS65105RGERG4?

The C2-/MODE pin (Pin 18) configures the positive charge pump operation mode: connecting it to GND selects voltage doubler mode (VO3 ≈ 2×VO1), while connecting a flying capacitor between C2-/MODE and C2+ enables voltage tripler mode (VO3 ≈ 3×VO1). This pin also serves as the negative terminal for the flying capacitor in tripler mode. The TPS65105RGERG4 uses this pin to adapt VO3 output to varying LCD panel voltage requirements without changing external components.

Does the TPS65105RGERG4 provide fault protection for all outputs?

Yes, the TPS65105RGERG4 provides comprehensive fault protection: VO1, VO2, and VO3 are continuously monitored for overvoltage and undervoltage conditions. If any output deviates beyond its specified threshold (e.g., VO1 ±6% to ±12%), the device enters full shutdown - disabling all regulators and charge pumps. This behavior distinguishes the TPS65105RGERG4 from the TPS65101, which lacks this shutdown feature.

How does the TPS65105RGERG4 achieve continuous conduction mode at light loads?

The TPS65105RGERG4 uses Virtual Synchronous Converter Technology: it combines an external Schottky diode with an internal P-channel MOSFET (rDS(on) ≈ 9–22 Ω) across the SW–SUP path. During light loads, the internal MOSFET conducts reverse current, allowing inductor current to go negative and sustaining continuous conduction mode. This eliminates switching-frequency variation and output ripple spikes seen in standard nonsynchronous boost converters - a key advantage of the TPS65105RGERG4.

Can the VCOM buffer in the TPS65105RGERG4 be disabled to reduce power consumption?

Yes, the VCOM buffer in the TPS65105RGERG4 can be fully disabled to reduce quiescent current: tie VCOMIN (Pin 14) to GND. When VCOMIN is grounded, the buffer shuts down and VCOM (Pin 13) may be left open. This reduces total device quiescent current by ~750–1300 µA, as confirmed in the electrical characteristics table under II(QVCOM). The TPS65105RGERG4 supports this low-power mode without affecting other outputs.

What is the purpose of the SUP pin on the TPS65105RGERG4?

The SUP pin (Pin 12) is the dedicated supply input for the negative charge pump, positive charge pump, and VCOM buffer bias circuits. It must be connected directly to VO1 - the output of the main boost converter - and must not be tied to any other voltage source. TI explicitly advises against placing a bypass capacitor directly on SUP, as it can destabilize charge pump operation. This architecture ensures all auxiliary rails track VO1, simplifying design and improving regulation accuracy in the TPS65105RGERG4.