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Texas Instruments TPS71518DCKRM3
- Part No.:
- TPS71518DCKRM3
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
TPS71518DCKRM3.pdf
- Description:
- IC REG LINEAR 1.8V 50MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,924
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Product details
Overview
TPS71518DCKRM3 from Texas Instruments is a fixed-output 1.8-V, 50-mA low-dropout linear regulator with 3.2-μA quiescent current, 2.5–24-V input range, and SC70-5 package-designed for battery-powered microcontrollers and ultra-low-power sensing nodes in industrial automation and medical wearables.
For engineers reviewing the TPS71518DCKRM3 datasheet, TPS71518DCKRM3 pinout, TPS71518DCKRM3 application, or TPS71518DCKRM3 equivalent, key selection criteria include dropout voltage at 50 mA (415 mV typ), stability with ≥0.47-μF output capacitance, thermal performance (RθJB = 40.7°C/W), and compatibility with Li-ion, 12-V rail, and wide-input legacy systems.
Technical Context
The TPS71518DCKRM3 implements a CMOS pass transistor architecture with internal 1.205-V bandgap reference and leakage-null control circuitry active below 5 μA load. It operates across –40°C to +125°C junction temperature and supports normal regulation only when VIN > VOUT + VDO (415 mV @ 50 mA) and IOUT < 350 mA (new-chip current limit).
Its functional block includes integrated soft-start to limit inrush current, overcurrent protection with brick-wall limiting, and no enable pin-requiring external power sequencing control. The device is stable without an ESR requirement on COUT, enabling use with ceramic capacitors as small as 0.47 μF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 1.8 V ±4% accuracy over full load and temperature range-ensures reliable MCU core supply under varying battery discharge profiles. |
| Quiescent current | 3.2 μA typical across 0–50 mA load-enables multi-year operation from coin-cell batteries in always-on sensor nodes. |
| Dropout voltage | 415 mV typical at 50 mA-allows regulation down to VIN = 2.215 V, supporting single-cell LiFePO4 or deeply discharged alkaline sources. |
| Input voltage range | 2.5 V to 24 V (30 V absolute max for new chip)-accommodates 12-V industrial rails, automotive transients, and wide-range DC-DC pre-regulation. |
| Output capacitance | ≥0.47 μF ceramic (50% derated)-permits compact, low-ESR designs without tantalum or electrolytic components. |
| Thermal resistance | RθJB = 40.7°C/W-supports 150 mW dissipation at 50 mA ΔV = 3 V without board-level heatsinking in standard FR4 layouts. |
| PSRR | 60 dB at 100 kHz-suppresses switching noise from upstream DC-DC converters feeding sensitive analog or RF subsystems. |
Pinout & Package
TPS71518DCKRM3 uses the 5-pin SC70 (DCK) package, measuring 2.00 mm × 1.25 mm, with exposed pad not connected internally. Thermal performance relies on PCB copper area under the package body and connection of NC pins to ground for improved RθJB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No-connect | Internally unconnected; tie to GND for optimal thermal conduction and EMI reduction-no electrical function. |
| 2 (GND) | Ground reference | Primary return path for IN, OUT, and internal bias; must be low-impedance and adjacent to CIN/COUT pads. |
| 3 (NC) | No-connect | Second unconnected pin; same thermal recommendation as Pin 1-floating acceptable but grounded preferred. |
| 4 (IN) | Input supply | Accepts 2.5–24 V; requires ≥0.1-μF ceramic capacitor to GND close to pin to suppress high-frequency ringing. |
| 5 (OUT) | Regulated output | Delivers 1.8 V at up to 50 mA; requires ≥0.47-μF ceramic capacitor to GND-minimum effective capacitance must remain above threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ across full load | 3.2 μA maintained from 0 to 50 mA-eliminates efficiency penalty at light loads common in sleep-mode IoT endpoints. |
| Internal soft-start | Controls output ramp rate during power-up-prevents inrush-induced brownout of upstream supplies or reset glitches in attached MCUs. |
| Overcurrent protection | Brick-wall current limit of 350 mA (new chip)-protects against short-circuit faults without latch-up or thermal shutdown dependency. |
| Wide-input stability | Stable with any ≥0.47-μF ceramic output capacitor-removes ESR constraints and enables cost-effective, space-efficient filtering. |
| High-temp operation | Rated for –40°C to +125°C junction-validates use in enclosed industrial enclosures, LED drivers, and medical diagnostic housings. |
Applications
| Home and building automation | Retail automation and payment |
|---|---|
Use Scenario: Battery-powered wireless occupancy sensors and smart thermostats operating on AA/AAA cells for 5+ years. IC Role / Device Role / Timing Role: Primary 1.8-V LDO supplying MSP430 or nRF52840 MCU core and ADC reference, replacing inefficient buck converters in low-duty-cycle systems. Use Value: 3.2-μA IQ extends battery life by >3× versus comparable 15-μA LDOs, while 24-V input tolerance accommodates PoE-powered gateway interfaces. | Use Scenario: Compact handheld barcode scanners and NFC payment terminals using single-cell Li-ion with tight space constraints. IC Role / Device Role / Timing Role: Fixed 1.8-V regulator for secure element ICs and low-voltage logic-replacing discrete Zener + transistor solutions with higher precision and lower footprint. Use Value: SC70-5 package (2.0 × 1.25 mm) reduces PCB area by 70% vs SOT-23-5; 415-mV dropout enables full 1.8-V regulation until battery drops to 2.215 V. |
| Grid infrastructure | Medical applications |
Use Scenario: Remote fault-current monitors and smart meter auxiliary power rails exposed to 24-V DC distribution buses with transient spikes. IC Role / Device Role / Timing Role: Input-stage LDO conditioning 24-V bus to 1.8 V for isolation barrier controllers and metrology ADCs-handling line surges up to 30 V abs max. Use Value: 30-V absolute maximum input rating eliminates need for external TVS clamping in Class I industrial environments per IEC 61000-4-5. | Use Scenario: Portable ECG and pulse oximetry devices requiring FDA-compliant low-noise, long-life power for analog front-ends and Bluetooth LE radios. IC Role / Device Role / Timing Role: Clean 1.8-V supply for precision op-amps and SAR ADCs-leveraging 425-μVrms output noise (200 Hz–100 kHz) and 60-dB PSRR at 100 kHz. Use Value: Low noise and high PSRR reduce post-processing filtering requirements, enabling smaller form factors and lower BOM count in Class II medical devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS71518DCKR | Same silicon, non-M3 suffix-legacy chip with higher ground current (4.8 μA max) and 750-mV dropout at 50 mA. | Less suitable for ultra-long-life battery applications; acceptable where 125°C operation not required. | Select TPS71518DCKR only if cost sensitivity outweighs IQ and thermal performance needs. |
| MCP1700T-1802E/TT | Microchip 1.8-V LDO with 1.6-μA IQ but limited 6-V max input and 250-mA current limit-no 24-V capability. | Restricted to low-voltage embedded systems (e.g., USB-powered); cannot replace in 12/24-V industrial designs. | Choose MCP1700T-1802E/TT only for space-constrained, sub-6-V applications where lowest possible IQ is critical. |
Compared with TPS71518DCKRM3, TPS71518DCKR trades 1.6-μA higher quiescent current and 335-mV higher dropout for legacy qualification, while MCP1700T-1802E/TT offers lower IQ but sacrifices 18-V input headroom-making TPS71518DCKRM3 the sole option balancing ultra-low IQ, 24-V input, and 125°C operation in SC70.
Availability
TPS71518DCKRM3 is available at Aetrix Electronics and suitable for home automation, grid monitoring, and portable medical devices requiring stable component supply across extended product lifecycles and industrial temperature ranges.
Supply support for TPS71518DCKRM3 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 TPS715 family targets ultra-low-power, wide-input LDO regulation-specifically engineered for battery longevity and robustness in space-constrained, thermally demanding applications like smart sensors and portable diagnostics.
FAQ
What is the maximum input voltage rating for TPS71518DCKRM3?
The TPS71518DCKRM3 has an absolute maximum input voltage of 30 V for the new-chip revision (M3 suffix), with recommended operating range of 2.5 V to 24 V. Exceeding 30 V risks permanent damage, and operation above 24 V should be limited to transient conditions verified per IEC 61000-4-5.
Does TPS71518DCKRM3 require an external enable signal to operate?
No, TPS71518DCKRM3 has no enable pin and operates continuously when valid input voltage is applied. It enters quiescent mode automatically when input falls below minimum operating voltage (2.5 V), and resumes regulation immediately upon restoration-no external sequencing or control logic is needed for basic operation of TPS71518DCKRM3.
What output capacitor value is mandatory for stable operation of TPS71518DCKRM3?
TPS71518DCKRM3 requires a minimum effective output capacitance of 0.47 μF-achieved with a nominal 1-μF X7R ceramic capacitor (50% derating assumed). Capacitor must be placed within 2 mm of the OUT and GND pins; ESR is not specified, enabling use of low-cost, low-profile MLCCs without stability risk.
How does the dropout voltage of TPS71518DCKRM3 vary with load and temperature?
TPS71518DCKRM3 dropout voltage is 415 mV typical at 50 mA and 25°C, rising to ≤525 mV across –40°C to +125°C. At 10 mA, dropout drops to ~150 mV. This behavior reflects its CMOS pass transistor RDS(ON), making TPS71518DCKRM3 especially efficient in intermittent-load applications like wake-on-radio sensor nodes.
Is TPS71518DCKRM3 pin-compatible with other TPS715 variants?
Yes-TPS71518DCKRM3 shares identical SC70-5 (DCK) pinout with all fixed-output TPS715xxDCKR/M3 variants (e.g., TPS71533, TPS71550). Pin 1 and Pin 3 are NC; Pin 2 is GND; Pin 4 is IN; Pin 5 is OUT. No layout change is required when migrating between fixed-output versions of TPS71518DCKRM3 and compatible variants.
TPS71518DCKRM3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.75V @ 50mA
- Current - Output:
- 50mA
- Current - Quiescent (Iq):
- 5.8 µA
- Current - Supply (Max):
- 5.8 µA
- PSRR:
- 60dB (100kHz)
- Control Features:
- Current Limit
- Protection Features:
- Over Current, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
TPS71518DCKRM3 FAQ
1.How can I place an order for TPS71518DCKRM3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS71518DCKRM3 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 TPS71518DCKRM3 reliable?
The price and inventory of TPS71518DCKRM3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS71518DCKRM3 is usually 5 days.
3.What payment methods are accepted for TPS71518DCKRM3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS71518DCKRM3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS71518DCKRM3?
TPS71518DCKRM3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS71518DCKRM3 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 TPS71518DCKRM3?
For technical support, including TPS71518DCKRM3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS71518DCKRM3 requirements.
6.How does Aetrix verify that TPS71518DCKRM3 is sourced from the original manufacturer or authorized distributors?
All TPS71518DCKRM3 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 TPS71518DCKRM3 meets industry standards.
7.What is the process for return or replacement of TPS71518DCKRM3?
All TPS71518DCKRM3 units undergo pre-shipment inspection (PSI). If there is an issue with TPS71518DCKRM3, 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 TPS71518DCKRM3 part is unused and in its original packaging.
Return procedure for TPS71518DCKRM3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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