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Texas Instruments TPS79418DCQRG4
- Part No.:
- TPS79418DCQRG4
- Manufacturer:
- Texas Instruments
- Package:
- SOT-223-6
- Datasheet:
-
TPS79418DCQRG4.pdf
- Description:
- IC REG LIN 1.8V 250MA SOT223-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,426
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Product details
Overview
TPS79418DCQRG4 from Texas Instruments is a 250mA fixed-output (1.8V) low-dropout linear regulator in SOT-223-6 package, featuring 155mV typical dropout at full load, 60dB PSRR at 10kHz, and fast 500µs startup time. It delivers stable, low-noise power to noise-sensitive analog circuitry in portable RF electronics and embedded systems.
For engineers reviewing the TPS79418DCQRG4 datasheet, TPS79418DCQRG4 pinout, TPS79418DCQRG4 application, or TPS79418DCQRG4 equivalent, key selection criteria include output noise (71µVRMS), thermal shutdown behavior, enable-input logic thresholds (VEN(HI) = 0.85–VIN, VEN(LOW) = 0–0.425V), and compatibility with 1µF minimum COUT ceramic capacitors.
Technical Context
The TPS79418DCQRG4 implements a PMOS pass transistor architecture with integrated undervoltage lockout (UVLO threshold: 1.32–1.6V), active discharge (via internal pulldown MOSFET), and hybrid brickwall-foldback current limiting (ICL = 320–460mA, ISC = 175mA). It operates across –40°C to +125°C junction temperature with no external feedback required.
Its regulation loop is optimized for stability with ≥1µF ceramic output capacitance and exhibits excellent transient response: <10mV load regulation (0–250mA), 0.05–0.12%/V line regulation, and sub-100µs recovery from 200mA load steps. The device lacks a noise reduction (NR) pin in its "New Chip" revision, distinguishing it from legacy HVSSOP variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 1.8V ±3% - eliminates external resistor divider, reduces BOM count and layout sensitivity. |
| Max output current | 250mA continuous - supports moderate-power microcontrollers, sensors, and interface ICs without thermal derating at TJ ≤ 125°C. |
| Dropout voltage | 155mV typ at 250mA - enables operation from 2.7V input to deliver 1.8V output, critical for single-cell Li-ion or 3.3V rail down-conversion. |
| PSRR | 64dB at 10kHz (New Chip) - suppresses switching noise from upstream DC/DC converters feeding sensitive RF/analog stages. |
| Output noise | 71µVRMS (100Hz–100kHz) - meets low-noise requirements for ADC references, PLL VCO supplies, and audio codecs. |
| Enable threshold | VEN(HI) ≥ 0.85VIN, VEN(LOW) ≤ 0.425V - compatible with 1.8V/3.3V GPIOs and supports controlled power sequencing. |
| Startup time | 500µs (New Chip) - ensures deterministic power-on timing for synchronized system initialization. |
Pinout & Package
SOT-223-6 package (6.5mm × 7.06mm), thermally enhanced with exposed pad (GND-connected); suitable for high-reliability industrial and automotive-adjacent applications requiring >1W dissipation capability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: IN | Input supply | Unregulated input (2.7–5.5V); connects to upstream DC/DC or battery; requires ≥1µF ceramic bypass capacitor. |
| 2: OUT | Regulated output | 1.8V fixed output; drives load directly; requires ≥1µF ceramic output capacitor for stability. |
| 3: GND | Ground reference | Power ground return path; ties to PCB ground plane; connects to exposed thermal pad for heat dissipation. |
| 4: NR/FB | No-connect (NC) | Not internally connected on TPS79418DCQRG4 (New Chip); leave floating or connect to GND for improved thermal performance. |
| 5: EN | Enable control | Active-high logic input; pulls up to IN or MCU GPIO; places device in <1µA shutdown when low. |
| 6: GND | Ground reference | Second ground terminal; must be tied to same ground net as Pin 3 and thermal pad for low-impedance return. |
Key Features
| Feature | Design Value |
|---|---|
| Fast startup | 500µs (New Chip) - enables rapid system wake-up from deep-sleep states without compromising regulation accuracy. |
| Active discharge | Internal pulldown MOSFET discharges VOUT during shutdown - prevents floating outputs and simplifies power sequencing in multi-rail systems. |
| Thermal protection | Junction shutdown at ~165°C, auto-restart at ~140°C - prevents permanent damage during overload or poor heatsinking conditions. |
| Reverse current protection | Body diode conduction limited to <5% rated current - mandates external Schottky diode if VOUT > VIN condition persists (e.g., hot-swap, backup battery). |
| UVLO | 1.32–1.6V rising threshold with 130mV hysteresis - ensures clean power-on reset and avoids brown-out oscillation during input ramp-up. |
Applications
| Portable RF Electronics | Industrial Sensor Nodes |
|---|---|
|
Use Scenario: Powering RF transceivers (e.g., Bluetooth LE, Zigbee) in battery-powered IoT edge devices where EMI immunity and spectral purity are critical. IC Role / Device Role / Timing Role: Low-noise 1.8V supply for VCO tuning, LNA bias, and ADC reference rails - directly impacts phase noise and SNR. Use Value: 71µVRMS output noise and 64dB PSRR at 10kHz suppress switching artifacts from shared 3.3V DC/DC, preserving RF link margin. |
Use Scenario: Regulating power for MEMS accelerometers, temperature sensors, and 16-bit SAR ADCs in factory-floor monitoring nodes operating at –40°C to +85°C. IC Role / Device Role / Timing Role: Precision analog supply with <10mV load regulation - maintains sensor offset stability and ADC LSB accuracy across dynamic current loads. Use Value: 155mV dropout enables reliable 1.8V output from aging 2.7V Li-SOCl₂ batteries, extending field deployment life by >20%. |
| Smartphone Peripherals | Home Theater Audio DACs |
|
Use Scenario: Supplying USB-C accessory controllers, display bridge ICs, and touch controller ASICs in compact mobile accessories. IC Role / Device Role / Timing Role: Fast-startup (500µs), enable-controlled 1.8V rail - synchronizes with host enumeration and minimizes accessory boot latency. Use Value: Active discharge clears VOUT within microseconds of EN deassertion, preventing backfeed into disabled host ports during hot-plug events. |
Use Scenario: Providing ultra-low-noise 1.8V bias for stereo audio DACs and headphone amplifiers in premium AV receivers. IC Role / Device Role / Timing Role: Fixed-output LDO with 0.05%/V line regulation - rejects ripple from shared SMPS rails, reducing audible hum and intermodulation distortion. Use Value: Stable 1.8V ±3% output over –40°C to +125°C ensures consistent DAC full-scale voltage and THD+N performance across ambient extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A2018PDQNR | Lower quiescent current (6.5µA vs 250–1000µA), lower noise (2.2µVRMS), but only 300mA max output and no active discharge. | Better suited for always-on battery sensors; unsuitable where fast discharge or >250mA peak load is required. | Select TPS7A2018PDQNR for ultra-low-IQ designs; retain TPS79418DCQRG4 when active discharge or higher surge current is needed. |
| MCP1700T-1802E/MB | 100mA output, 170mV dropout, no enable pin, no active discharge, wider input range (2.3–6.0V). | Targeted at cost-sensitive, low-current applications like simple microcontroller cores; lacks sequencing control. | Choose MCP1700T-1802E/MB for non-sequenced, low-power MCU rails; use TPS79418DCQRG4 when enable control, 250mA, or active discharge is mandatory. |
Compared with TPS7A2018PDQNR and MCP1700T-1802E/MB, the TPS79418DCQRG4 uniquely balances 250mA delivery, active discharge, and 71µVRMS noise - making it optimal for mixed-signal systems requiring both robust sequencing and analog integrity.
Availability
TPS79418DCQRG4 is available at Aetrix Electronics and suitable for industrial sensor nodes, portable RF electronics, smartphone peripherals, and home theater audio DACs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS79418DCQRG4 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 connectivity technologies, with decades of LDO design expertise and broad automotive/industrial qualification.
The TPS794 family was engineered for noise-sensitive analog subsystems in portable and embedded applications, emphasizing PSRR, low dropout, and fast transient response - not general-purpose power conversion.
FAQ
What is the maximum input voltage rating for the TPS79418DCQRG4?
The TPS79418DCQRG4 has an absolute maximum input voltage of 6.5V for the "New Chip" revision. Operation above 5.5V violates recommended conditions and risks permanent damage. Its specified input range is 2.7V to 5.5V, with minimum VIN determined by dropout: VIN ≥ 1.8V + VDO (155mV typ).
Does the TPS79418DCQRG4 require an external noise reduction capacitor?
No. The TPS79418DCQRG4 is a "New Chip" variant and does not include a functional Noise Reduction (NR) pin. The NR/FB pin is a no-connect (NC) terminal. Output noise of 71µVRMS is achieved without external NR capacitors, unlike legacy HVSSOP versions that used CNR.
How does the enable pin (EN) behave during power-down sequencing?
The TPS79418DCQRG4 EN pin is active-high with VEN(HI) ≥ 0.85VIN and VEN(LOW) ≤ 0.425V. When EN falls below threshold, the device enters shutdown (<1µA IQ) and activates its internal pulldown MOSFET to discharge VOUT - ensuring clean, controlled power-down without floating outputs.
Can the TPS79418DCQRG4 safely handle reverse current flow from VOUT to VIN?
No. The TPS79418DCQRG4 contains a PMOS pass transistor with an inherent body diode that conducts reverse current when VOUT > VIN. Extended reverse conduction degrades reliability. External Schottky protection is required if VOUT biasing exceeds 5% of 250mA (12.5mA) during input collapse.
What output capacitor value is required for stability with the TPS79418DCQRG4?
The TPS79418DCQRG4 is stable with a minimum 1.0µF ceramic output capacitor (X5R/X7R). The effective capacitance must remain ≥0.47µF across temperature and bias. Larger values (e.g., 2.2µF) improve transient response and reduce output impedance, but are not required for basic stability.
TPS79418DCQRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-223-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 250mA
- Current - Quiescent (Iq):
- 220 µA
- Current - Supply (Max):
- -
- PSRR:
- 65dB ~ 40dB (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-223-6
TPS79418DCQRG4 FAQ
1.How can I place an order for TPS79418DCQRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS79418DCQRG4 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 TPS79418DCQRG4 reliable?
The price and inventory of TPS79418DCQRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS79418DCQRG4 is usually 5 days.
3.What payment methods are accepted for TPS79418DCQRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS79418DCQRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS79418DCQRG4?
TPS79418DCQRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS79418DCQRG4 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 TPS79418DCQRG4?
For technical support, including TPS79418DCQRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS79418DCQRG4 requirements.
6.How does Aetrix verify that TPS79418DCQRG4 is sourced from the original manufacturer or authorized distributors?
All TPS79418DCQRG4 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 TPS79418DCQRG4 meets industry standards.
7.What is the process for return or replacement of TPS79418DCQRG4?
All TPS79418DCQRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS79418DCQRG4, 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 TPS79418DCQRG4 part is unused and in its original packaging.
Return procedure for TPS79418DCQRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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