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Texas Instruments TPS77450DGK
- Part No.:
- TPS77450DGK
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS77450DGK.pdf
- Description:
- IC REG LINEAR 5V 250MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:400
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Product details
Overview
TPS77450DGK from Texas Instruments is a 5.0-V fixed-output, 250-mA low-dropout (LDO) voltage regulator with integrated open-drain power-good (PG) output, housed in an 8-pin MSOP (DGK) package. It delivers ultralow 92-µA quiescent current, 200-mV typical dropout at full load, ±2% output voltage tolerance over line/load/temperature, and 55-µVrms output noise without external filtering - ideal for powering noise-sensitive analog circuitry in portable instrumentation.
For engineers reviewing the TPS77450DGK datasheet, TPS77450DGK pinout, TPS77450DGK application, or TPS77450DGK equivalent, key selection criteria include its PG threshold (82% of VOUT), enable polarity (active-low), thermal shutdown protection, compatibility with 1-µF tantalum or 10-µF ceramic output capacitors, and operation across –40°C to 125°C junction temperature.
Technical Context
The TPS77450DGK uses a PMOS pass element enabling low dropout (200 mV @ 250 mA) and load-independent quiescent current (92 µA). Its internal 1.183-V reference feeds a precision error amplifier that drives the pass device to maintain regulation under fast load transients.
It integrates a comparator monitoring VOUT against 82% of nominal output; when VOUT drops below this threshold, the open-drain PG pin pulls low. The EN pin is active-low, disabling the regulator and reducing ground current to ≤3 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% over line, load, and –40°C to 125°C junction temperature - ensures stable supply for 5-V logic and analog subsystems. |
| Max Output Current | 250 mA continuous - sufficient for powering microcontrollers, ADCs, and RF front-ends in compact embedded systems. |
| Dropout Voltage | 200 mV typical at 250 mA (TJ = 25°C) - enables operation from 5.2-V input, extending battery life in 2-cell Li-ion or 6-V rail applications. |
| Quiescent Current | 92 µA typical at full load, ≤3 µA in shutdown - critical for always-on sensor nodes and low-power IoT endpoints. |
| Output Noise | 55 µVrms (300 Hz–100 kHz), no external bypass capacitor required - eliminates need for extra filtering components in precision signal chains. |
| Power-Good Threshold | 82% of VOUT (4.1 V), with hysteresis - provides reliable undervoltage detection for system-level power sequencing and fault reporting. |
| Enable Polarity | Active-low EN input - simplifies interface with standard logic-level control signals and microcontroller GPIOs. |
Pinout & Package
TPS77450DGK is packaged in an 8-pin MSOP (DGK) with 0.65-mm pitch, measuring 3.0 mm × 3.0 mm × 1.0 mm (max height), suitable for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB/SENSE) | Feedback/Sense input | Connects to regulated output for fixed versions; used with external resistor divider for adjustable variants - requires short, low-noise routing to avoid instability. |
| 2 (PG) | Power-good open-drain output | Active-high status indicator; requires external pullup resistor - signals valid 5-V supply to host controller or FPGA configuration logic. |
| 3 (EN) | Enable input | Active-low logic control; <0.7 V disables regulator, >2 V enables - compatible with 3.3-V and 5-V digital I/O standards. |
| 4 (GND) | Regulator ground | Common return path for input, output, and internal circuitry - must be connected to low-impedance system ground plane. |
| 5, 6 (IN) | Input voltage terminals | Dual-input pins reduce trace resistance and improve current handling - accept 2.7 V to 10 V input, with minimum VI = VO + 1 V (6.0 V for 5-V output). |
| 7, 8 (OUT) | Regulated output terminals | Dual-output pins lower conduction loss and improve thermal performance - deliver stable 5.0 V to load with ≤1 mV load regulation. |
Key Features
| Feature | Design Value |
|---|---|
| PMOS Pass Element | Enables ultra-low dropout (200 mV @ 250 mA) and load-independent quiescent current - maximizes usable battery voltage range. |
| Integrated Power-Good | Open-drain PG output with precise 82% VOUT trip point and hysteresis - eliminates need for external supervisor IC in power sequencing designs. |
| Low-Noise Regulation | 55 µVrms output noise without external filter capacitor - reduces BOM count and board area in audio, sensor, and RF applications. |
| Capacitor Flexibility | Stable with 1-µF tantalum (low capacitance) or 10-µF ceramic (low ESR) output capacitors - supports diverse sourcing and cost-optimized designs. |
| Fast Transient Response | Maintains <1% output deviation during 250-mA load steps - preserves signal integrity in burst-mode wireless transceivers and high-speed data converters. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered wearable ECG monitor requiring clean 5-V supply for analog front-end and low-power MCU. IC Role / Device Role / Timing Role: Primary 5-V LDO regulator with PG output used for supply validation before ADC sampling and Bluetooth LE transmission. Use Value: 55-µVrms noise ensures sub-µV-level ECG signal fidelity; 92-µA quiescent current extends single-charge runtime beyond 72 hours. | Use Scenario: DIN-rail mounted PLC module with isolated 5-V logic rail derived from 24-V DC input. IC Role / Device Role / Timing Role: Local 5-V regulator for digital I/O drivers and FPGA configuration, with PG signal feeding watchdog timer. Use Value: 200-mV dropout allows use of compact 24-V-to-5-V two-stage conversion; thermal shutdown protects against ambient temperature excursions up to 70°C. |
| Automotive Body Control Units | Test & Measurement Equipment |
Use Scenario: Interior lighting control module operating from vehicle battery (9–16 V) with strict EMC and thermal requirements. IC Role / Device Role / Timing Role: Secondary 5-V regulator for CAN transceiver and microcontroller, enabled only during active communication cycles. Use Value: Active-low EN enables duty-cycled operation; ±2% output tolerance meets AEC-Q100 Class 2 voltage accuracy requirements. | Use Scenario: Benchtop multimeter with dual 5-V rails for analog signal conditioning and display controller. IC Role / Device Role / Timing Role: Precision 5-V source for 24-bit sigma-delta ADC reference and op-amp biasing, monitored via PG for calibration validity. Use Value: 55-µVrms noise directly improves effective resolution; 82% PG threshold enables early warning of input rail sag during high-current test loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76350DBVR | 200-mA output, 120-µA quiescent current, no PG output, SOT-23-5 package | Lacks power-good signaling; smaller footprint but lower current capability | Select when PG is unnecessary and board space is constrained; verify thermal derating at 250 mA. |
| TLV70050DDCR | 200-mA output, 35-µA quiescent current, active-high PG, 5-pin SOT-23 package | Lower IQ but reduced current rating; active-high PG simplifies pullup design | Prefer for ultra-low-power applications where 200 mA suffices and active-high logic is preferred. |
Compared with TPS77450DGK, TPS76350DBVR trades PG functionality and current headroom for smaller size, while TLV70050DDCR offers lower quiescent current but sacrifices 50 mA of output capacity and uses different PG polarity - all three require distinct PCB layouts due to differing pinouts and packages.
Availability
TPS77450DGK is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and automotive body control units requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for TPS77450DGK 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 for industrial, automotive, and personal electronics markets.
The TPS774xx family was designed specifically for space- and power-constrained applications needing integrated power supervision, low noise, and wide-capacitor-stability - targeting portable instrumentation, factory automation, and automotive sub-systems.
FAQ
What is the minimum input voltage required for stable operation of the TPS77450DGK?
The minimum input voltage for the TPS77450DGK is 6.0 V, calculated as VOUT + 1 V (5.0 V + 1 V) per datasheet Section 7. For reliable 250-mA operation, VI must exceed VO by at least the dropout voltage (200 mV typical), making 5.2 V the theoretical minimum - but 6.0 V is the specified minimum to ensure full specification compliance across temperature and process variation. Input below 6.0 V may cause PG assertion or regulation loss.
Does the TPS77450DGK require an external filter capacitor to achieve its 55-µVrms noise specification?
No, the TPS77450DGK achieves 55-µVrms output noise (300 Hz–100 kHz) without any external filter or bypass capacitor - a key differentiator from most low-noise LDOs. This specification is verified per datasheet Figure 8 and applies to the TPS77418 and TPS77450 variants. Adding external capacitors does not further reduce noise but may be needed for stability or transient response depending on output capacitor ESR.
How does the power-good (PG) output of the TPS77450DGK behave during startup and fault conditions?
At power-up, the PG output remains low until VOUT reaches 82% of 5.0 V (4.1 V), then transitions to high-impedance (logic high with external pullup). During operation, if VOUT falls below 4.1 V due to overload or input sag, PG pulls low immediately - no delay. Hysteresis of ~0.5% VOUT prevents chatter near the threshold. The TPS77450DGK PG is open-drain and requires an external pullup resistor to the desired logic rail.
Can the TPS77450DGK be used with a 1-µF ceramic output capacitor?
Yes, the TPS77450DGK is stable with a 1-µF ceramic output capacitor provided its ESR falls within the region of stability shown in Figure 18 (ESR < 0.1 Ω at 25°C for 1-µF case). However, the datasheet recommends ≥10 µF ceramic or ≥1 µF tantalum for robustness across temperature and load. Using 1 µF ceramic may reduce transient margin and requires careful ESR verification per Figures 18–21.
What is the thermal shutdown threshold and recovery behavior of the TPS77450DGK?
Thermal shutdown activates at a junction temperature of 144°C (typical), as specified in Section 7 of the datasheet. Once triggered, the TPS77450DGK disables the pass element and halts output regulation. Recovery is automatic: when junction temperature falls below the hysteresis threshold (~130°C), the device resumes normal operation without requiring an enable cycle. This protects against sustained overloads and poor heatsinking in enclosed environments.
TPS77450DGK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.19V @ 250mA
- Current - Output:
- 250mA
- Current - Quiescent (Iq):
- 125 µA
- Current - Supply (Max):
- -
- PSRR:
- 55dB (1kHz)
- Control Features:
- Enable, Power Good
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
TPS77450DGK FAQ
1.How can I place an order for TPS77450DGK through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS77450DGK on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TPS77450DGK reliable?
The price and inventory of TPS77450DGK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS77450DGK is usually 5 days.
3.What payment methods are accepted for TPS77450DGK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS77450DGK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS77450DGK?
TPS77450DGK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS77450DGK order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TPS77450DGK?
For technical support, including TPS77450DGK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS77450DGK requirements.
6.How does Aetrix verify that TPS77450DGK is sourced from the original manufacturer or authorized distributors?
All TPS77450DGK products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS77450DGK meets industry standards.
7.What is the process for return or replacement of TPS77450DGK?
All TPS77450DGK units undergo pre-shipment inspection (PSI). If there is an issue with TPS77450DGK, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TPS77450DGK part is unused and in its original packaging.
Return procedure for TPS77450DGK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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