Texas Instruments TPS65148RHBR

Overview

TPS65148RHBR from Texas Instruments is a compact TFT LCD bias IC integrating a 18 V/4 A boost converter (VS), a ±130 mA VCOM buffer, a 12.5 V/30 mA gamma voltage regulator (VREG_O), gate voltage shaping (VGHM), and an open-drain reset function (XAO). It operates from 2.5–6 V input and delivers precise biasing for monitor and TV LCD panels with integrated discharge and safety protections.

For engineers reviewing the TPS65148RHBR datasheet, TPS65148RHBR pinout, TPS65148RHBR application, or TPS65148RHBR equivalent, this device supports critical timing-critical power sequencing, high-voltage stress management, and gate driver control for input-to-output isolation switches in 5 V-input LCD systems.

Technical Context

The TPS65148RHBR implements a current-mode PWM boost converter with selectable 630 kHz or 1.2 MHz switching frequency, adaptive off-time control for superior transient response, and integrated overvoltage protection referenced to the SUP pin. Its VCOM buffer features unity-gain operation, 60 MHz bandwidth, and ±130 mA drive capability into the LCD backplane.

Gate voltage shaping uses dual PMOS (M1/M2) with configurable discharge slope via RE pin and logic-controlled VFLK input, enabling flexible VGHM waveform generation from external positive charge pump input (VGH up to 35 V). The XAO reset output activates on VIN threshold detection (1.240 V ±24 mV) with 65 mV hysteresis.

Key Specifications

Pinout & Package

TPS65148RHBR is housed in a thermally enhanced 32-pin QFN package (5 mm × 5 mm, 0.5 mm pitch) with exposed thermal pad (PowerPAD®) for efficient heat dissipation in high-power LCD bias applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65148RHBR, TPS65136RSLR omits gate voltage shaping and reset signaling but adds integrated VGL generation, while MAX1664ETL+ trades programmability and panel protection features for lower quiescent current and smaller footprint in portable applications.

Availability

TPS65148RHBR is available at Aetrix Electronics and suitable for monitor manufacturing, TV panel integration, and industrial LCD display design requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS65148RHBR 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 delivering analog, embedded processing, and connectivity solutions with focus on reliability, precision, and power efficiency.

The TPS65148RHBR belongs to TI's LCD bias power management product line, engineered specifically for TFT monitor and TV panels requiring integrated gamma regulation, VCOM buffering, gate voltage control, and robust power sequencing.

FAQ

What is the maximum allowable VGH input voltage for TPS65148RHBR?

The absolute maximum VGH voltage is 36 V, with recommended operating range of 15 V to 35 V. Exceeding 35 V risks exceeding the VGHM output stage's safe operating area and may degrade r_DS(on) stability over temperature. The datasheet specifies 35 V as the upper limit for reliable gate voltage shaping operation in production environments.

Does TPS65148RHBR support both 630 kHz and 1.2 MHz switching frequencies simultaneously?

No - TPS65148RHBR supports only one switching frequency at a time, selected by the logic level on the FREQ pin: grounded for 630 kHz or tied to VIN for 1.2 MHz. The internal oscillator does not allow concurrent operation or dynamic switching; changing frequency requires hardware reconfiguration before power-up.

How is the XAO reset threshold set on TPS65148RHBR?

The XAO reset threshold is set externally via a resistor divider from VIN to GND connected to the VDET pin. With VDET = 1.240 V ±24 mV and 65 mV hysteresis, a typical divider uses R1 = 100 kΩ from VIN to VDET and R2 = 70 kΩ from VDET to GND for 5 V input, yielding precise undervoltage detection for TPS65148RHBR power sequencing.

Can TPS65148RHBR drive a VCOM load requiring more than ±130 mA?

No - TPS65148RHBR's VCOM buffer is rated for ±130 mA continuous output current per the datasheet's I_sc and I_o specifications. Attempting to drive higher loads causes output voltage droop, thermal throttling, or latch-up. For >±130 mA applications, external amplification or alternative bias ICs like TPS65132 must be used.

What thermal considerations apply to the PowerPAD® on TPS65148RHBR?

The exposed thermal pad (PowerPAD®) on TPS65148RHBR must be soldered to a minimum 200 mm² copper pour with ≥4 thermal vias (0.3 mm diameter) to inner ground planes. This achieves the specified θ_JB = 9.4°C/W; insufficient thermal relief raises junction temperature above 125°C under full VS + VREG_O + VCOM load, triggering thermal shutdown.