Texas Instruments TPS7A4450DGQR

Overview

TPS7A4450DGQR from Texas Instruments is a 50-mA, 65-V input, ultra-low-I_Q (5.5 μA) LDO voltage regulator with dual outputs: adjustable/fixed OUT (1.24–14.5 V) and selectable MID_OUT (10/12/15 V), 1% output accuracy over –40°C to +125°C, and integrated power-good (open-drain PG) and precision enable. It supports high-voltage industrial power tools, PLCs, and EV charging infrastructure.

For engineers reviewing the TPS7A4450DGQR datasheet, TPS7A4450DGQR pinout, TPS7A4450DGQR application, or TPS7A4450DGQR equivalent, key selection criteria include its 65-V max input with 85-V transient tolerance, shared 50-mA current budget between OUT and MID_OUT, HVSSOP-10 thermal performance (R_θJA = 53.7°C/W), and MVSEL-based mid-rail configuration for gate-driver biasing.

Technical Context

The TPS7A4450DGQR implements a high-voltage bipolar process LDO architecture with independent feedback control loops for OUT (via FB pin) and MID_OUT (via MVSEL1/MVSEL2 logic inputs), enabling simultaneous regulation of two rails from a single input. Its precision enable threshold (VEN(HI) = 1.24 V ±50 mV) and open-drain PG output support robust power sequencing in multi-rail systems.

Thermal shutdown (170°C) and overcurrent protection are implemented per rail, with distinct dropout specifications: V_DO(OUT) = 800 mV at 50 mA (VIN→VOUT), V_{DO(MID_OUT)} = 600 mV at 50 mA (VIN→VMID_OUT), and V_DO(OUT) = 200 mV when biased from VMID_OUT - enabling efficient cascaded regulation.

Key Specifications

Pinout & Package

HVSSOP-10 (DGQ) package: 3.00 mm × 3.00 mm body with exposed thermal pad; R_θJA = 53.7°C/W, R_θJC(bot) = 9.6°C/W - thermal pad must be soldered to PCB GND plane for rated performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output LDO applications.

Compared with TPS7A4450DGQR, TPS7A4501DGQR reduces complexity for single-rail systems but forfeits integrated mid-rail generation, while LT3094EMSE#PBF offers lower noise and I_Q at the cost of input voltage range, dual-output capability, and power sequencing support.

Availability

TPS7A4450DGQR is available at Aetrix Electronics and suitable for cordless power tools, industrial PLCs, and EV charging infrastructure requiring stable component supply across extended temperature and high-voltage operating conditions.

Supply support for TPS7A4450DGQR 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, embedded processing, and high-reliability ICs for industrial, automotive, and communications markets.

The TPS7A44 product line delivers high-input-voltage LDOs with dual outputs and precision enable for industrial power management, targeting applications needing robust regulation across wide input ranges and harsh thermal environments.

FAQ

What is the maximum input voltage rating for the TPS7A4450DGQR?

The TPS7A4450DGQR has an absolute maximum input voltage of 85 V for 200 ms transients, with recommended continuous operation from 4 V to 65 V. Exceeding 65 V continuously risks thermal overload due to increased power dissipation, even though the device survives short transients per datasheet Section 6.1.

How is the MID_OUT voltage configured on the TPS7A4450DGQR?

The TPS7A4450DGQR sets MID_OUT to 10 V, 12 V, or 15 V using logic levels on MVSEL1 and MVSEL2 pins per Table 8-1: 00 = 10 V, 01 = 12 V, 10 = 15 V. Both pins must be actively driven - floating either pin violates datasheet requirements and may cause undefined output voltage.

Does the TPS7A4450DGQR support adjustable output voltage?

No, the TPS7A4450DGQR is the fixed-output variant. Its OUT pin delivers a factory-set voltage (not specified in provided data, but consistent with DGQ package fixed versions). The adjustable version uses FB pin; TPS7A4450DGQR omits FB functionality and uses internal resistor divider for fixed VOUT.

What capacitor values are required for stable operation of the TPS7A4450DGQR?

The TPS7A4450DGQR requires CIN ≥ 0.1 μF, COUT ≥ 1 μF (ceramic), and CMID_OUT ≥ 3×COUT (≥3 μF) per Section 6.3. Derating to 50% of nominal value is assumed; thus 2.2 μF COUT ensures ≥1.1 μF effective capacitance at bias voltage.

Can the TPS7A4450DGQR's EN pin be left unconnected?

Yes, the TPS7A4450DGQR's EN pin has an internal pullup current source, so it defaults to enabled when floating. However, datasheet Section 5 warns that tying EN directly to IN is only safe if VIN ≤ 18 V; above that, external resistor-divider biasing is mandatory to avoid exceeding VEN(max) = 20 V.