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Texas Instruments TPS77918DGK
- Part No.:
- TPS77918DGK
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS77918DGK.pdf
- Description:
- IC REG LINEAR 1.8V 250MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,208
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Product details
Overview
TPS77918DGK from Texas Instruments is a 250-mA, 1.8-V fixed-output low-dropout (LDO) voltage regulator with integrated open-drain power-on reset in an 8-pin MSOP (DGK) package. It delivers ultralow 92-µA quiescent current, 55 µVrms output noise without bypass capacitor, and 2% output voltage tolerance over line, load, and temperature. It serves as a precision power supply for battery-powered DSPs, microcontrollers, and analog signal chains requiring clean, stable 1.8-V rail generation.
For engineers reviewing the TPS77918DGK datasheet, TPS77918DGK pinout, TPS77918DGK application, or TPS77918DGK equivalent, key selection criteria include its 220-ms reset delay, PMOS pass architecture enabling low dropout (200 mV at 250 mA), thermal shutdown protection, fast transient response, and compatibility with low-ESR ceramic (10 µF) or tantalum (1 µF) output capacitors.
Technical Context
The TPS77918DGK implements a PMOS-based LDO topology with internal 1.1834-V reference and high-impedance feedback sensing, enabling stable regulation with minimal quiescent current independent of load. Its integrated reset circuit monitors regulated output voltage and asserts active-low RESET after a precise 220-ms delay when VO reaches 95% of nominal 1.8 V.
Designed for ultra-low-noise operation, it achieves 55 µVrms output noise (300 Hz–100 kHz) without external filtering, and supports fast load transient recovery due to optimized control-loop dynamics. The device operates across –40°C to 125°C junction temperature and accepts input voltages from 2.7 V to 10 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2% over line, load, and temperature - ensures reliable logic-level compliance for 1.8-V digital cores. |
| Max Output Current | 250 mA - sufficient for powering single-core MCUs, ADCs, or RF front-end bias rails. |
| Dropout Voltage | 200 mV typical at 250 mA - enables operation from 2.0-V input, critical for single-cell Li-ion or coin-cell systems. |
| Quiescent Current | 92 µA typical at full load, <1 µA in shutdown - extends battery life in always-on sensor nodes and wearables. |
| Output Noise | 55 µVrms (300 Hz–100 kHz), no bypass capacitor required - eliminates need for extra filter components in noise-sensitive analog/RF stages. |
| Reset Delay | 220 ms fixed - provides deterministic power-up sequencing for microprocessors and DSPs without external timing components. |
| Operating Temp Range | –40°C to 125°C - qualified for automotive under-hood and industrial control environments. |
Pinout & Package
TPS77918DGK is housed in an 8-pin MSOP (DGK) package - also designated VSSOP - with 0.65-mm pitch, exposed thermal pad (not electrically connected), and surface-mount footprint optimized for space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB/SENSE (Pin 1) | Feedback/Sense input | High-impedance node tied to output for fixed versions; connects to resistor divider for adjustable variants - routing must minimize noise pickup to avoid instability. |
| RESET (Pin 2) | Open-drain reset output | Active-low, requires external pullup; asserts low when VO drops below 95% of 1.8 V - used for system initialization and brownout detection. |
| EN (Pin 3) | Enable input | Logic-high enables regulator; TTL-compatible (VIH ≥ 2 V, VIL ≤ 0.7 V) - supports low-power sleep mode with <1 µA standby current. |
| GND (Pin 4) | Regulator ground | Reference return for IN, OUT, and internal circuits - must be low-impedance connection to minimize noise coupling. |
| IN (Pins 5, 6) | Input voltage supply | Dual-input pins reduce trace resistance and improve current handling - accepts 2.7 V to 10 V, with recommended minimum VI = VO + 1 V. |
| OUT (Pins 7, 8) | Regulated output | Dual-output pins lower effective ESR and improve thermal performance - delivers stable 1.8 V to load with 10-µF ceramic or 1-µF tantalum capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power-On Reset | 220-ms delay with 95% VO threshold and hysteresis - eliminates need for discrete supervisor IC in compact embedded designs. |
| Ultralow-Noise Regulation | 55 µVrms output noise without external bypass - preserves SNR in precision ADCs, DACs, and RF synthesizers. |
| PMOS Pass Element | Dropout voltage proportional to load current (200 mV @ 250 mA) and quiescent current load-independent - maximizes efficiency across dynamic load profiles. |
| Wide Capacitor Compatibility | Stable with 1-µF tantalum (low-ESR) or 10-µF ceramic - reduces BOM count and simplifies layout versus traditional LDOs requiring large bulk caps. |
| Thermal & Current Protection | Thermal shutdown at ~144°C and current limit ~0.9 A - prevents catastrophic failure during overload or ambient temperature excursions. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous glucose monitor with 1.8-V ADC, BLE radio, and low-power MCU operating from coin-cell battery. IC Role / Device Role / Timing Role: Primary 1.8-V power rail generator with integrated reset for deterministic startup and brownout recovery. Use Value: 92-µA quiescent current extends battery life beyond 1 year; 55 µVrms noise avoids ADC quantization errors without added filtering. | Use Scenario: DIN-rail mounted programmable logic controller with isolated 1.8-V FPGA configuration rail. IC Role / Device Role / Timing Role: Local point-of-load regulator supplying FPGA configuration voltage with reset assertion during input undervoltage events. Use Value: 220-ms reset delay ensures reliable FPGA configuration lock; –40°C to 125°C rating supports uncooled industrial enclosures. |
| Automotive Camera ECUs | Test & Measurement Signal Sources |
Use Scenario: Rear-view camera module with 1.8-V image sensor and ISP, powered from 5-V vehicle bus via intermediate LDO. IC Role / Device Role / Timing Role: Final-stage 1.8-V regulator with reset monitoring to prevent corrupted image capture during cold-crank transients. Use Value: Fast transient response minimizes voltage droop during sensor pixel readout bursts; 200-mV dropout allows operation down to 2.0-V input during cranking. | Use Scenario: Portable arbitrary waveform generator with 1.8-V DAC core and precision reference buffer. IC Role / Device Role / Timing Role: Ultra-low-noise analog supply rail generator ensuring DAC SFDR > 90 dBc. Use Value: 55 µVrms noise directly translates to <–100 dBc THD floor; no bypass cap requirement saves board area and cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A2418PDBVR | Lower quiescent current (25 µA), no integrated reset, 1.8-V fixed, SOT-23-5 package | Lacks power-on reset functionality; requires external supervisor for sequencing | Select when ultra-low IQ dominates over reset integration and board space permits separate supervisor. |
| MCP1826T-1802E/DB | 250-mA, 1.8-V fixed, 220-mV dropout, no reset, 5-pin SOT-23 package, higher noise (120 µVrms) | No reset output; higher output noise limits use in precision analog systems | Select for cost-sensitive, non-critical digital rails where reset is handled elsewhere and noise is not limiting. |
Compared with TPS77918DGK, TPS7A2418PDBVR offers superior quiescent current but forfeits integrated reset, while MCP1826T-1802E/DB matches output current and dropout but lacks reset and exhibits higher noise - making TPS77918DGK optimal for space-constrained, noise-sensitive, reset-critical 1.8-V applications.
Availability
TPS77918DGK is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive camera ECUs, and test & measurement signal sources requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for TPS77918DGK 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 specializing in analog, embedded processing, and power management technologies, with decades of LDO design heritage and automotive-grade qualification expertise.
The TPS779xx family was engineered specifically for battery-powered and noise-sensitive applications demanding integrated reset, ultralow IQ, and high PSRR - targeting portable instrumentation, industrial automation, and automotive vision systems.
FAQ
What is the maximum input voltage rating for the TPS77918DGK?
The TPS77918DGK has an absolute maximum input voltage rating of 13.5 V, but its recommended operating input voltage range is 2.7 V to 10 V. Operation above 10 V is not advised per datasheet specifications, and minimum input must exceed VO + 1 V (i.e., ≥2.8 V) for proper regulation at full load. Exceeding these limits risks permanent damage or degraded performance.
Does the TPS77918DGK require an external bypass capacitor to achieve its specified 55 µVrms noise performance?
No, the TPS77918DGK achieves 55 µVrms output noise (300 Hz–100 kHz) without any external bypass capacitor - a key differentiator from most low-noise LDOs. This specification is verified in the datasheet under standard test conditions (TJ = 25°C, IO = 1 mA, CO = 10 µF ceramic), eliminating BOM cost and PCB area typically needed for noise filtering.
How does the RESET output of the TPS77918DGK behave during power-up and brownout conditions?
The RESET output of the TPS77918DGK is an open-drain, active-low signal. At power-up, it remains low until the regulated 1.8-V output reaches 95% (1.71 V), then transitions to high-impedance after a fixed 220-ms delay. During brownout, RESET pulls low immediately when VO falls below 95% - providing deterministic reset assertion for microcontrollers and DSPs without external supervision circuitry.
Can the TPS77918DGK operate stably with a 1-µF tantalum output capacitor?
Yes, the TPS77918DGK is explicitly characterized and guaranteed stable with a 1-µF tantalum output capacitor, provided its ESR falls within the stability region defined in Figures 18–21 of the datasheet. It also supports 10-µF low-ESR ceramic capacitors - offering flexibility to optimize for size, cost, or transient response without compromising loop stability.
What thermal protection features are built into the TPS77918DGK?
The TPS77918DGK incorporates thermal shutdown protection that disables the regulator when junction temperature exceeds approximately 144°C. Once the die cools below ~130°C, normal operation resumes automatically. This feature prevents irreversible damage during sustained overload or high-ambient-temperature operation, complementing its internal current limit (~0.9 A) and safe operating area design.
TPS77918DGK 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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 250mA
- Current - Quiescent (Iq):
- 125 µA
- Current - Supply (Max):
- -
- PSRR:
- 55dB (1kHz)
- Control Features:
- Enable, Reset
- 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
TPS77918DGK FAQ
1.How can I place an order for TPS77918DGK through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS77918DGK 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 TPS77918DGK reliable?
The price and inventory of TPS77918DGK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS77918DGK is usually 5 days.
3.What payment methods are accepted for TPS77918DGK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS77918DGK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS77918DGK?
TPS77918DGK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS77918DGK 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 TPS77918DGK?
For technical support, including TPS77918DGK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS77918DGK requirements.
6.How does Aetrix verify that TPS77918DGK is sourced from the original manufacturer or authorized distributors?
All TPS77918DGK 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 TPS77918DGK meets industry standards.
7.What is the process for return or replacement of TPS77918DGK?
All TPS77918DGK units undergo pre-shipment inspection (PSI). If there is an issue with TPS77918DGK, 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 TPS77918DGK part is unused and in its original packaging.
Return procedure for TPS77918DGK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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