My Inquiry
My Account
Texas Instruments TPS79918DDCTG4
- Part No.:
- TPS79918DDCTG4
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
TPS79918DDCTG4.pdf
- Description:
- IC REG LINEAR 1.8V 200MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,675
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TPS79918DDCTG4 from Texas Instruments is a 200-mA, low-quiescent-current (40 μA), ultralow-noise (10.5 × VOUT μVRMS), high-PSRR (66 dB @ 1 kHz) low-dropout linear regulator in a 5-pin SOT-23-THIN package, delivering fixed 1.8 V output for RF power amplifiers and precision analog circuitry in wearable electronics and wireless LAN modules.
For engineers reviewing the TPS79918DDCTG4 datasheet, TPS79918DDCTG4 pinout, TPS79918DDCTG4 application, or TPS79918DDCTG4 equivalent, key selection criteria include its 100 mV dropout at 200 mA, ±2% total output accuracy over –40°C to +125°C, stability with ≥2-μF ceramic output capacitance, and noise-reduction (NR) pin support for sub-20 μVRMS output noise in VCO biasing applications.
Technical Context
The TPS79918DDCTG4 employs a PMOS pass element and high-gain error amplifier to achieve ultralow dropout (100 mV @ 200 mA) and high PSRR (66 dB @ 1 kHz, 51 dB @ 10 kHz) even at low headroom (VIN – VOUT = 0.25 V). Its bandgap reference and feedback loop deliver ±2% output accuracy across load (500 μA–200 mA), line (2.7–6.5 V), and temperature (–40°C to +125°C).
It integrates inrush current protection triggered by EN toggle start-up, overshoot detection (5% threshold), and thermal shutdown (165°C). The NR pin enables external 0.01-μF capacitor bypassing of bandgap noise, reducing integrated output noise to 10.5 × VOUT μVRMS (≈19 μVRMS at 1.8 V) while maintaining fast 50-μs startup time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 1.8 V - precisely regulated without external resistors; supports direct replacement of 1.8-V logic and RF ICs. |
| Max output current | 200 mA - sufficient for powering single RF transceivers, sensor signal chains, or microcontroller cores. |
| Quiescent current | 40 μA typical - enables >1-year battery life in always-on wearable sensors with 200-mAh coin cells. |
| Dropout voltage | 100 mV @ 200 mA - allows operation from 1.9-V input (e.g., single Li-ion cell at end-of-discharge) while sustaining 1.8-V output. |
| PSRR | 66 dB @ 1 kHz - suppresses switching noise from adjacent DC/DC converters feeding shared input rails. |
| Output noise | 10.5 × VOUT μVRMS (≈19 μVRMS) - meets stringent phase noise requirements for 2.4-GHz VCOs and LNA biasing. |
| Accuracy | ±2% over load, line, temp - ensures reliable logic-level compatibility and ADC reference stability without calibration. |
| Stability | With ≥2-μF ceramic COUT (X5R/X7R) - eliminates need for tantalum or electrolytic capacitors; reduces BOM count and board space. |
Pinout & Package
TPS79918DDCTG4 uses the 5-pin SOT-23-THIN (DDC) package, measuring 2.90 mm × 1.60 mm × 1.10 mm, with exposed pad not present. Pin assignment is validated per TI SBVS056L Rev L (Feb 2022), Figure 5-1 and Table 5-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input supply | Accepts 2.7–6.5 V input; minimum VIN = VOUT + VDO = 1.9 V, enabling single-cell Li-ion operation. |
| 2 - GND | Ground reference | Primary return path for load, quiescent, and enable currents; must be low-impedance connection to system ground plane. |
| 3 - EN | Enable control | Active-high TTL/CMOS-compatible input; drives high (>1.2 V) to enable, low (<0.4 V) to shut down (ISHDN = 0.15 μA). |
| 4 - NR | Noise reduction | Fixed-output variant only; connects to 0.01-μF ceramic capacitor to shunt bandgap noise and reduce output noise to ~19 μVRMS. |
| 5 - OUT | Regulated output | Delivers stable 1.8 V; requires ≥2-μF ceramic capacitor to ground for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Inrush current protection | EN toggle activation immediately engages current limit (220–600 mA), preventing input rail collapse during cold-start of RF power stages. |
| Overshoot detection | Active pulldown resistor (~350 Ω) engages if VOUT exceeds nominal by >5%, limiting post-enable voltage spikes that could damage 1.8-V I/O interfaces. |
| Ultra-low noise architecture | NR pin + 0.01-μF capacitor reduces integrated output noise to 10.5 × VOUT μVRMS, critical for <−140 dBc/Hz phase noise in 5-GHz WLAN front-ends. |
| High PSRR at low headroom | Maintains 66 dB PSRR at 1 kHz even with VIN – VOUT = 0.25 V, enabling clean 1.8-V supply from noisy buck converter outputs. |
| Thermal & UVLO protection | Shuts down at 165°C junction temperature and locks out until VIN rises above 2.2 V (UVLO hysteresis = 70 mV), preventing brownout-induced logic faults. |
Applications
| RF Power Amplifier Biasing | VCO/PLL Core Supply |
|---|---|
|
Use Scenario: Providing ultra-clean 1.8-V bias to GaAs pHEMT power amplifiers in Bluetooth® 5.0 modules. IC Role / Device Role / Timing Role: Low-noise LDO supplying constant current to PA drain while rejecting switching noise from 3.3-V buck converter. Use Value: 10.5 × VOUT μVRMS noise and 66 dB PSRR prevent AM-to-PM distortion and maintain EVM <1.5% at 20 dBm output. |
Use Scenario: Powering the core VCO and divider circuits in 2.4-GHz IEEE 802.11n transceivers. IC Role / Device Role / Timing Role: Fixed 1.8-V regulator with NR pin bypassing bandgap noise to minimize close-in phase noise. Use Value: Sub-20 μVRMS output noise directly improves VCO phase noise by up to 6 dB at 10-kHz offset, meeting -110 dBc/Hz spec. |
| Wearable Sensor Signal Chain | Low-Power MCU Core Rail |
|
Use Scenario: Regulating 1.8-V supply for MEMS accelerometer/gyroscope analog front-end and 16-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Precision LDO ensuring stable reference and bias voltages despite varying battery voltage (3.0–2.7 V). Use Value: ±2% accuracy and 40 μA IQ enable <12-bit effective resolution over full battery discharge cycle without software calibration. |
Use Scenario: Delivering 1.8-V core voltage to ARM Cortex-M4 microcontrollers in energy-harvesting IoT nodes. IC Role / Device Role / Timing Role: Enable-controlled LDO supporting deep-sleep modes with 0.15 μA shutdown current. Use Value: EN pin allows host MCU to power-cycle TPS79918DDCTG4 during idle periods, reducing system standby power to <1 μW. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS79918DDCR | Same silicon, tape-and-reel packaging (no G4 suffix); identical electrical specs, thermal performance, and pinout. | No functional difference; selected for automated SMT assembly vs. sample/bench use. | Choose TPS79918DDCR for volume production; TPS79918DDCTG4 is same device in cut-tape format. |
| ADP125ARHZ-1.8-R7 | 200-mA LDO with 30 μA IQ, 60 dB PSRR @ 1 kHz, but no NR pin; 1.8-V fixed output; 150 mV dropout @ 200 mA. | Lacks noise-reduction capability; unsuitable for VCO/RF bias where sub-25 μVRMS noise is required. | Select ADP125ARHZ-1.8-R7 only for cost-sensitive digital rail applications where PSRR >60 dB suffices and noise <30 μVRMS is acceptable. |
Compared with TPS79918DDCTG4, TPS79918DDCR offers identical performance in reel format for production, while ADP125ARHZ-1.8-R7 trades noise performance and NR functionality for slightly lower IQ and higher dropout-making it viable only for non-RF digital loads.
Availability
TPS79918DDCTG4 is available at Aetrix Electronics and suitable for RF power amplifier biasing, VCO core supply, wearable sensor signal chains, and low-power MCU core rails requiring stable component supply with guaranteed long-term availability.
Supply support for TPS79918DDCTG4 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 and high-performance signal chain solutions.
The TPS799 family is designed for ultra-low-noise, high-PSRR portable and RF applications-targeting wireless infrastructure, handheld devices, and precision instrumentation where clean, efficient 1.8-V to 4.5-V regulation is critical.
FAQ
What is the maximum input voltage rating for the TPS79918DDCTG4?
The TPS79918DDCTG4 has an absolute maximum input voltage of 7.0 V, but its recommended operating range is 2.7 V to 6.5 V. Operation above 6.5 V risks permanent damage, while inputs below 2.7 V may not sustain regulation due to dropout constraints-minimum valid VIN is 1.9 V (1.8 V + 100 mV dropout) at full load.
Does the TPS79918DDCTG4 require an external noise-reduction capacitor to achieve its specified output noise?
Yes-the TPS79918DDCTG4 achieves its 10.5 × VOUT μVRMS (≈19 μVRMS) output noise specification only when a 0.01-μF ceramic capacitor is connected to the NR pin. Without this capacitor, output noise rises to ~94 × VOUT μVRMS (≈170 μVRMS), degrading RF system phase noise performance.
Can the TPS79918DDCTG4 be used with a 2.2-μF output capacitor only, or are additional capacitors needed?
The TPS79918DDCTG4 is fully stable with a single 2.2-μF X5R or X7R ceramic capacitor on the OUT pin-no additional output capacitance is required. An optional 0.1–1-μF input capacitor is recommended near the IN pin to improve transient response and PSRR, but it is not mandatory for stability.
What is the enable pin behavior and shutdown current of the TPS79918DDCTG4?
The EN pin is active-high with VIH = 1.2 V min and VIL = 0.4 V max. When pulled low (<0.4 V), the TPS79918DDCTG4 enters shutdown mode, drawing just 0.15 μA typical (1 μA max) ground current-ideal for battery-powered systems needing nanowatt-level standby power.
Is the TPS79918DDCTG4 compatible with ceramic output capacitors having ESR below 10 mΩ?
Yes-the TPS79918DDCTG4 is specifically designed for low-ESR ceramic capacitors and remains stable with ESR as low as 0 Ω. Its internal compensation does not require added ESR; using X5R/X7R types with ESR <10 mΩ is preferred to maximize PSRR and minimize output impedance across frequency.
TPS79918DDCTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.18V @ 200mA
- Current - Output:
- 200mA
- Current - Quiescent (Iq):
- 60 µA
- Current - Supply (Max):
- -
- PSRR:
- 70dB ~ 38dB (100Hz ~ 100kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
TPS79918DDCTG4 FAQ
1.How can I place an order for TPS79918DDCTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS79918DDCTG4 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 TPS79918DDCTG4 reliable?
The price and inventory of TPS79918DDCTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS79918DDCTG4 is usually 5 days.
3.What payment methods are accepted for TPS79918DDCTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS79918DDCTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS79918DDCTG4?
TPS79918DDCTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS79918DDCTG4 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 TPS79918DDCTG4?
For technical support, including TPS79918DDCTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS79918DDCTG4 requirements.
6.How does Aetrix verify that TPS79918DDCTG4 is sourced from the original manufacturer or authorized distributors?
All TPS79918DDCTG4 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 TPS79918DDCTG4 meets industry standards.
7.What is the process for return or replacement of TPS79918DDCTG4?
All TPS79918DDCTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS79918DDCTG4, 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 TPS79918DDCTG4 part is unused and in its original packaging.
Return procedure for TPS79918DDCTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPS79918DDCTG4 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
