Texas Instruments TPS75003RHLRG4

Overview

TPS75003RHLRG4 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 tested and endorsed for Xilinx Spartan-3, Spartan-3E, and Spartan-3L FPGAs.

For engineers reviewing the TPS75003RHLRG4 datasheet, TPS75003RHLRG4 pinout, TPS75003RHLRG4 application, or TPS75003RHLRG4 equivalent, this PMIC supports precise rail sequencing, monotonic startup compliance, and flexible external configuration of all three output voltages across 2.2V–6.5V input range - critical for FPGA core/I/O/auxiliary supply design.

Technical Context

The TPS75003RHLRG4 implements two identical non-synchronous buck controllers using PMOS gate drivers with minimum on-time (1.36–1.84 μs) and off-time (0.44–0.86 μs) hysteretic control, enabling 100% duty cycle operation near dropout. Each buck channel features independent current sensing via IS1/IS2 pins referenced to 80–120 mV internal threshold and external resistor-based current limit setting.

The integrated LDO uses a PMOS pass device with 250–350 mV dropout at 300 mA, 0.507 V feedback reference, ±4% output voltage accuracy, and thermal shutdown at 175°C. All three regulators share independent EN/SS/FB pins and operate across –40°C to +85°C with 42.6°C/W junction-to-ambient thermal resistance in the VQFN package.

Key Specifications

Pinout & Package

TPS75003RHLRG4 is housed in a 20-pin VQFN package (4.5 mm × 3.5 mm × 0.9 mm) with an exposed thermal pad (DGND). The package supports high-power density layout with dedicated ground paths: DGND pins (6, 15, and exposed pad) for buck converters, and AGND (pin 18) for LDO analog reference.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65023RGZR and TPS65270RGET, the TPS75003RHLRG4 uniquely combines 3A buck capability, Xilinx-validated sequencing, and PMOS-based 100% duty cycle operation - making it the only direct fit for Spartan-3 FPGA auxiliary/core/I/O rail consolidation without redesign.

Availability

TPS75003RHLRG4 is available at Aetrix Electronics and suitable for FPGA power systems, DSL modem designs, and plasma display panel controllers requiring stable component supply, long-term lifecycle assurance, and qualified production lots.

Supply support for TPS75003RHLRG4 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 TPS75003RHLRG4 belongs to TI's configurable PMIC product line designed specifically for multi-supply FPGA, DSP, and ASIC applications - emphasizing rail sequencing, monotonic startup, and compact integration for space-constrained embedded systems.

FAQ

What is the maximum output current supported by each regulator in the TPS75003RHLRG4?

The TPS75003RHLRG4 supports up to 3 A per buck channel (BUCK1 and BUCK2) and 300 mA from its integrated LDO (OUT3). These ratings are specified across –40°C to +85°C ambient with proper PCB thermal design, including soldering the exposed DGND pad to a thermal plane. The buck current limit is set externally via IS1/IS2 resistors, while the LDO current limit is internal and fixed at 375–1000 mA depending on conditions.

Does the TPS75003RHLRG4 require external MOSFETs for the buck regulators?

Yes, the TPS75003RHLRG4 requires external P-channel MOSFETs for both buck controllers - it provides gate drive signals (SW1 and SW2) but does not integrate power switches. This architecture allows optimization of efficiency, thermal performance, and cost based on specific voltage/current requirements. The LDO regulator, however, integrates its PMOS pass transistor and needs no external switching components.

Can the TPS75003RHLRG4 be used with Xilinx Spartan-6 or Artix-7 FPGAs?

The TPS75003RHLRG4 was explicitly tested and endorsed by Xilinx for Spartan-3, Spartan-3E, and Spartan-3L FPGAs - meeting their startup profile, monotonic ramp, and voltage-timing requirements. While it may function with later families, TI and Xilinx do not validate or guarantee compliance for Spartan-6 or Artix-7, which have different power sequencing specifications and higher current demands; newer PMICs like TPS65270 or TPS65070 are recommended for those devices.

What is the purpose of the AGND pin on the TPS75003RHLRG4?

The AGND pin (pin 18) serves as the dedicated analog ground reference for the LDO regulator's feedback circuitry and internal reference. It must be connected to a quiet ground plane separate from high-current DGND paths to prevent noise coupling into the LDO's 0.507 V feedback node - ensuring output voltage accuracy and stability. Mixing AGND with DGND degrades LDO load/line regulation and increases output noise.

How is output voltage configured on the TPS75003RHLRG4 buck and LDO channels?

Output voltage is configured externally using resistor dividers from each output to FBx pins: for buck channels (FB1/FB2), the divider sets VOUT = 1.220 V × (1 + R1/R2); for the LDO (FB3), VOUT = 0.507 V × (1 + R1/R2). All three channels support adjustable ranges - 1.2–6.5 V for bucks, 1.0–6.5 V for LDO - enabling precise matching to FPGA rail requirements such as 1.2 V (VCCINT), 3.3 V (VCCO), and 2.5 V (VCCAUX).