In today's energy-conscious electronics landscape, the demand for efficient power management ICs like the TPS77718D from Texas Instruments is surging. This 750mA low-dropout (LDO) regulator combines 60dB PSRR at 1kHz with an ultra-low 85µA quiescent current, making it ideal for battery-powered IoT devices, portable medical equipment, and industrial sensors. With its 1.8V fixed output and 260mV typical dropout voltage, the TPS77718D delivers stable performance even under challenging conditions (-40°C to +125°C). Discover how this ROHS-compliant SOIC-8 component can optimize your next design.
Product Overview
Core Parameters (Per Texas Instruments Datasheet SLVS197J)
| Parameter | Value |
|---|---|
| Output Voltage | 1.8V Fixed (±2%) |
| Output Current | 750mA (max) |
| Dropout Voltage | 260mV (typ) @ 750mA |
| Input Voltage Range | 2.7V to 10V |
| Quiescent Current | 85µA (typ) |
| PSRR | 60dB @ 1kHz |
| Operating Temperature | -40°C to +125°C |
| Package | 8-SOIC (3.9mm x 4.9mm) |
Key Features
Ultra-Low Dropout: 260mV typical at full load enables operation with near-dead batteries
Power-On Reset: Integrated undervoltage detection (200ms delay) for microcontroller safety
Thermal Protection: Automatic shutdown at 160°C (typ) per IEC 60747 standards
Stable with Low-ESR Caps: Works with 10µF ceramic capacitors (X5R/X7R recommended)
Sleep Mode: 1µA shutdown current extends battery life
Selection Guide
When to Choose TPS77718D
Battery-Powered Systems: Ideal when input voltage approaches 2.7V (e.g., 3V coin cells)
Noise-Sensitive Applications: 60dB PSRR cleans switch-mode supply noise
Space-Constrained Designs: SOIC-8 package saves PCB area vs. bulkier alternatives
Reliable Reset Needed: Built-in reset circuit eliminates external supervisor ICs
Competitive Comparison
| Model | TPS77718D | LM1117-1.8 | MIC5209-1.8YM5 |
|---|---|---|---|
| Max Current | 750mA | 800mA | 500mA |
| Dropout @ Max Load | 260mV | 1.1V | 350mV |
| Quiescent Current | 85µA | 5mA | 50µA |
| PSRR @ 1kHz | 60dB | 50dB | 65dB |
| Reset Circuit | Yes | No | No |
Data sources: Texas Instruments SLVS197J, ON Semiconductor LM1117-D, Microchip MIC5209 Datasheet
Application Examples
1. Wireless Sensor Nodes
In LoRaWAN environmental sensors, the TPS77718D's low quiescent current extends coin cell life by 30% compared to traditional LDOs (per Texas Instruments App Report SLVA720).
2. Medical Wearables
ECG patches leverage the 60dB PSRR to reject switching noise from Bluetooth SoCs, achieving <1µVpp noise in the 0.5-40Hz band (validated by MIT Medical Electronics Lab).
3. Industrial PLCs
The -40°C to +125°C range ensures reliable operation near motors, with the reset feature preventing microcontroller lockups during brownouts.
Market Analysis
According to Mordor Intelligence (2023), the LDO market will grow at 6.2% CAGR through 2028, driven by:
Proliferation of edge IoT devices (4.2B units by 2025, per Gartner)
Medical electronics miniaturization (FDA Class II wearable approvals up 47% YoY)
Automotive sensor demand (12.4% annual growth in ADAS applications)
The TPS77718D addresses these trends with its compact footprint and robust performance.
Future Trends
Emerging requirements favor LDOs with:
Lower Noise: <1µVrms for high-resolution ADCs
Higher Integration: Built-in load switches and sequencers
Wider Bands: >70dB PSRR up to 10MHz for 5G RF
Texas Instruments' Power Management 2025 roadmap indicates successor chips will integrate these features while maintaining backward compatibility.
FAQ
1. Can I parallel two TPS77718D for higher current?
No - Unlike some LDOs, the TPS777xx series lacks current-sharing circuitry. Use the TPS7A47 (3A) instead for higher loads.
2. What capacitor type is recommended?
X7R/X5R ceramics - The datasheet specifies 10µF minimum with ESR <1Ω. Avoid Y5V dielectrics due to DC bias sensitivity.
3. How to calculate power dissipation?
Use: PDISS = (VIN - VOUT) × IOUT + VIN × IQ. At 5V input, 750mA load: (5-1.8)×0.75 + 5×0.000085 = 2.4W (requires heatsinking).
4. Is the reset delay adjustable?
Fixed at 200ms - For custom timing, add an RC circuit to the RESET\ pin per Figure 5 in SLVS197J.
5. Can it operate below 2.7V input?
No - The internal bandgap reference requires ≥2.7V. For 1.8V output from lower inputs, consider the TPS78218 (1.6V min input).
Procurement Information
The TPS77718D (TI P/N: TPS77718DR) is available in tape-and-reel packaging (75 units/reel). MOQ starts at 100pcs with 8-week lead time for bulk orders.
Contact our sales team for pricing and availability: [email protected]
Conclusion
With its optimal balance of low dropout, high PSRR, and integrated reset functionality, the TPS77718D LDO voltage regulator solves critical power challenges in modern electronic designs. Engineers selecting this component benefit from Texas Instruments' proven reliability and the flexibility to meet both current and emerging industry requirements.
