Texas Instruments TPS75003RHLT

Overview

TPS75003RHLT from Texas Instruments is a configurable multirail power management IC (PMIC) integrating two 3A buck controllers and one 300mA LDO regulator. It delivers 1.2V/3A, 3.3V/3A, and 2.5V/300mA outputs with independent enable, soft-start, and feedback control - specifically validated for Xilinx Spartan-3, Spartan-3E, and Spartan-3L FPGA power sequencing.

For engineers reviewing the TPS75003RHLT datasheet, TPS75003RHLT pinout, TPS75003RHLT application, or TPS75003RHLT equivalent, this PMIC supports flexible rail configuration across 2.2V–6.5V input, enables monotonic startup per Xilinx requirements, and requires external PMOS FETs for buck stages while integrating full LDO pass transistor and protection circuitry.

Technical Context

The TPS75003RHLT implements two identical non-synchronous buck controllers using minimum on-time/minimum off-time hysteretic control, each driving an external P-channel MOSFET to achieve up to 95% efficiency and 100% duty cycle operation near dropout. Each buck stage features independent current sensing via IS1/IS2 pins referenced to internal 100mV threshold and externally adjustable soft-start via SS1/SS2 capacitors.

The integrated LDO uses a PMOS pass device with 250–350mV dropout at 300mA, stable with ≥2.2μF ceramic output capacitance, and includes thermal shutdown (175°C), current limiting (375–1000mA), and independent EN3/SS3 control. All three regulators share a common 2.2V–6.5V input range but operate with separate input pins (IN1, IN2, IN3) and ground domains (DGND, AGND).

Key Specifications

Pinout & Package

TPS75003RHLT is housed in a 20-pin VQFN package (RHL suffix) measuring 4.50 mm × 3.50 mm × 0.9 mm, with an exposed thermal pad (PAD) connected to DGND. The package supports high-power dissipation and requires controlled-impedance layout for SW1/SW2 and sensitive analog nodes (FBx, SSx, ISx).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multirail PMIC applications.

Compared with TPS65023RSBT and TPS65270RGET, the TPS75003RHLT uniquely combines asynchronous buck controllers (enabling 100% duty cycle) with a low-IQ LDO in a compact VQFN, making it optimal for FPGA applications demanding monotonic startup, minimal external components for LDO, and robust dropout behavior.

Availability

TPS75003RHLT is available at Aetrix Electronics and suitable for FPGA power supply, DSP core/I/O rail generation, DSL modem power management, and plasma TV display panel supply requiring stable component supply across industrial temperature range (–40°C to +85°C).

Supply support for TPS75003RHLT 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 ICs for industrial, automotive, and communications markets.

The TPS75003RHLT belongs to TI's configurable multirail PMIC product line, designed specifically to simplify power architecture for Xilinx FPGAs and other multi-supply digital systems requiring precise sequencing, high efficiency, and small footprint.

FAQ

What is the recommended input voltage range for TPS75003RHLT?

The TPS75003RHLT supports 2.2V to 6.5V on each input pin (IN1, IN2, IN3) independently. This allows flexible configurations - such as tying all inputs to a common 5V rail or using separate sources for noise isolation. Minimum input must exceed output voltage plus dropout (e.g., ≥1.45V for 1.2V buck output) to maintain regulation.

Does TPS75003RHLT integrate MOSFETs for the buck stages?

No, the TPS75003RHLT is a buck controller - not a buck converter - and requires external P-channel MOSFETs for both buck stages. It drives the gate via SW1 and SW2 pins and senses current through IS1/IS2. The LDO stage, however, integrates its PMOS pass transistor internally.

How is output voltage configured on TPS75003RHLT?

Each output voltage is set externally using resistor dividers connected to FB1 (buck 1), FB2 (buck 2), and FB3 (LDO). The internal feedback references are 1.220V for buck channels and 0.507V for the LDO. For example, 3.3V on buck 2 uses R1=205kΩ and R2=121kΩ to achieve VOUT = 1.220V × (1 + R1/R2).

What thermal considerations apply to TPS75003RHLT?

The TPS75003RHLT uses a 20-pin VQFN package with an exposed thermal pad (PAD) that must be soldered to a large PCB copper area connected to DGND. With RθJA = 42.6°C/W, continuous operation at full 3A per buck requires careful thermal layout - including multiple vias under the pad and adequate airflow or heatsinking in high-ambient environments.

Is TPS75003RHLT qualified for Xilinx Spartan-3 FPGA power delivery?

Yes, the TPS75003RHLT has been tested and endorsed by Xilinx for powering Spartan-3, Spartan-3E, and Spartan-3L FPGAs. It meets their startup profile requirements including monotonic voltage ramp, minimum rail rise time, and flexible sequencing via independent EN1/EN2/EN3 pins - confirmed in TI's SBVS052J datasheet.