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Texas Instruments TPS71533DCKRM3
- Part No.:
- TPS71533DCKRM3
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
TPS71533DCKRM3.pdf
- Description:
- IC REG LINEAR 3.3V 50MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,848
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Product details
Overview
TPS71533DCKRM3 from Texas Instruments is a fixed-output 3.3-V, 50-mA low-dropout linear regulator in SC70-5 package, featuring 3.2 μA typical quiescent current, 2.5 V to 24 V input range, and stable operation with ≥0.47 μF output capacitance - designed for battery-powered microcontroller power rails in space-constrained industrial sensors.
For engineers reviewing the TPS71533DCKRM3 datasheet, TPS71533DCKRM3 pinout, TPS71533DCKRM3 application, or TPS71533DCKRM3 equivalent, key selection criteria include ultra-low IQ across full load range (0–50 mA), dropout voltage of 415 mV at 50 mA, thermal performance up to +125°C junction, and compatibility with standard SC70 PCB footprints requiring no external feedback components.
Technical Context
The TPS71533DCKRM3 implements a CMOS pass transistor architecture with internal 1.205-V bandgap reference and leakage-null control circuitry active below 5 μA load. Its dropout behavior follows RDS(ON)-based scaling, delivering 415 mV typical VDO at 50 mA while maintaining regulation down to –40°C.
It integrates overcurrent protection with brick-wall limiting (125–350 mA depending on chip revision), internal soft-start to suppress inrush current, and operates without external compensation - enabled by stability with ceramic capacitors ≥0.47 μF and ESR-independent design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% accuracy over temperature and line/load conditions - eliminates need for external resistor divider and associated tolerance stack-up. |
| Quiescent Current | 3.2 μA typical across 0–50 mA load and –40°C to +125°C - enables multi-year battery life in always-on IoT endpoints. |
| Input Voltage Range | 2.5 V to 24 V (30 V absolute max for new-chip M3 variant) - supports direct connection to 12-V/24-V industrial buses and Li-ion stacks without pre-regulation. |
| Dropout Voltage | 415 mV typical at 50 mA load - allows regulation from 3.715 V input, critical for single-cell Li-ion (3.0–4.2 V) applications near end-of-discharge. |
| Output Capacitance | ≥0.47 μF ceramic (50% derated minimum effective value) - enables use of small 0402/0603 MLCCs without stability risk. |
| Junction Temp Range | –40°C to +125°C - qualified for under-hood automotive modules and industrial motor-control enclosures without derating. |
| PSRR @ 100 kHz | 60 dB - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
Pinout & Package
TPS71533DCKRM3 uses the 5-pin SC70 (DCK) package, measuring 2.00 mm × 1.25 mm, with exposed pad not electrically connected. Thermal resistance RθJA is 195.7°C/W (new chip), optimized for low-power board-level dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No-connect | Internally unconnected; recommended tied to GND for improved thermal conduction and EMI suppression. |
| 2 (GND) | Ground reference | Primary return path for regulator current and feedback network; must be low-impedance connection to system ground plane. |
| 3 (NC) | No-connect | Internally unconnected; same thermal recommendation as Pin 1. |
| 4 (IN) | Input supply | Accepts 2.5–24 V; requires ≥0.1 μF ceramic capacitor to GND close to pin to damp source inductance effects. |
| 5 (OUT) | Regulated output | Delivers stable 3.3 V; requires ≥0.47 μF ceramic capacitor to GND with effective value maintained after derating. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 3.2 μA typical across full 0–50 mA load range and –40°C to +125°C - preserves battery capacity during deep-sleep MCU states. |
| Wide-input-voltage operation | 2.5 V to 24 V input range - eliminates need for intermediate buck stage when powering from 12-V or 24-V rails or multi-cell batteries. |
| Capacitor-stable design | Stable with ≥0.47 μF ceramic output capacitor - avoids costly tantalum or polymer caps and simplifies BOM. |
| Integrated overcurrent protection | Brick-wall current limit (125–350 mA) - prevents thermal runaway during short-circuit or inrush events without external sensing. |
| Internal soft-start | Controlled output ramp at enable - prevents large inrush into downstream capacitive loads and avoids input rail sag. |
Applications
| Home Automation Sensor Node | Retail Payment Terminal |
|---|---|
Use Scenario: Battery-powered Zigbee/Z-Wave temperature/humidity sensor operating 10+ years on CR2032. IC Role / Device Role / Timing Role: Primary 3.3-V supply for MSP430 MCU and RF transceiver during active and deep-sleep modes. Use Value: 3.2 μA IQ extends battery life beyond 10 years; 0.47 μF output cap enables 0402 footprint saving PCB area. | Use Scenario: Compact EMV-compliant card reader powered from USB or coin-cell backup. IC Role / Device Role / Timing Role: Clean 3.3-V rail for secure element and contactless NFC controller during transaction bursts. Use Value: 60 dB PSRR at 100 kHz suppresses USB switcher noise; SC70-5 size fits within tight bezel constraints. |
| Smart Grid Endpoint Meter | Portable Medical Monitor |
Use Scenario: DIN-rail mounted electricity meter with PLC communication and 10-year battery backup. IC Role / Device Role / Timing Role: Isolated 3.3-V supply for metrology ADC and PLC PHY from 24-V bus or backup Li-SOCl₂ cell. Use Value: 24-V input rating accepts direct connection to industrial bus; –40°C to +125°C rating ensures field reliability. | Use Scenario: Handheld pulse oximeter using single Li-ion cell with continuous SpO₂ monitoring. IC Role / Device Role / Timing Role: Main 3.3-V supply for optical sensor ASIC and BLE SoC during 24/7 operation. Use Value: 415 mV dropout enables >3.7 V regulation down to 3.0 V battery voltage; low noise supports analog signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS71533DCKR | Same SC70-5 package and electrical specs, but legacy chip revision (higher IQ drift above 100°C, 750 mA current limit vs 350 mA). | Legacy version lacks M3-specific leakage-null optimization and tighter current-limit spec - suitable only where extended high-temp operation is not required. | Select TPS71533DCKR only if cost sensitivity outweighs thermal margin needs and long-term availability is confirmed. |
| MCP1703T-3302E/MB | 3.3 V fixed, 250 mA rated, 1.8 μA IQ, SOT-23-5 package - higher current but larger footprint and different pinout (IN-GND-EN-OUT-NC). | Supports higher load currents and lower IQ, but requires PCB redesign due to non-compatible pin mapping and 2.9 mm × 1.6 mm body size. | Choose MCP1703T-3302E/MB only when >50 mA load headroom or sub-2 μA IQ is mandatory and layout change is acceptable. |
Compared with TPS71533DCKRM3, the legacy TPS71533DCKR offers identical form factor but reduced thermal robustness above 100°C, while the MCP1703T-3302E/MB provides higher output current and lower IQ at the cost of incompatible pinout and larger PCB area - making TPS71533DCKRM3 optimal for space-constrained, thermally demanding 50-mA applications.
Availability
TPS71533DCKRM3 is available at Aetrix Electronics and suitable for home automation sensor nodes, retail payment terminals, and smart grid endpoint meters requiring stable component supply with guaranteed long-term manufacturability and consistent M3-chip revision sourcing.
Supply support for TPS71533DCKRM3 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and digital signal processing technologies with broad industrial and automotive qualification coverage.
The TPS715 family is part of TI's ultra-low-IQ LDO portfolio, engineered specifically for battery longevity and wide-input industrial power management - targeting applications where micropower efficiency and high-voltage tolerance are co-primary requirements.
FAQ
What is the maximum input voltage rating for TPS71533DCKRM3?
The TPS71533DCKRM3 is rated for 24 V maximum continuous input voltage, with an absolute maximum of 30 V applicable only to the new-chip M3 revision. Exceeding 24 V in normal operation risks violating recommended conditions and may impact long-term reliability - always verify actual VIN against datasheet limits for the specific device lot.
Does TPS71533DCKRM3 require an external feedback resistor network?
No, TPS71533DCKRM3 is a fixed-output 3.3-V variant and contains internal feedback resistors. Unlike the adjustable TPS71501, it has no FB pin and uses Pins 1 and 3 as NC - eliminating external resistor selection, tolerance errors, and board space for feedback components.
Can TPS71533DCKRM3 operate stably with a 0.47 μF X7R ceramic capacitor?
Yes, TPS71533DCKRM3 is explicitly characterized and guaranteed stable with ≥0.47 μF ceramic output capacitance, including common X7R dielectrics. The datasheet specifies this minimum effective value after 50% derating - so a nominal 1.0 μF X7R cap meets the requirement under bias and temperature.
What is the thermal performance difference between legacy and M3 versions of TPS71533DCKRM3?
The M3 revision (TPS71533DCKRM3) features improved thermal resistance: RθJA = 195.7°C/W versus 253.8°C/W for legacy chips. This 23% reduction enables higher sustained output current at elevated ambient temperatures - critical for sealed enclosures or stacked PCBs where airflow is limited.
Is TPS71533DCKRM3 pin-compatible with other SC70-5 LDOs like TPS79533?
No, TPS71533DCKRM3 is not pin-compatible with TPS79533 or other SC70-5 LDOs. While both use SC70-5 packaging, TPS71533DCKRM3 assigns Pins 1 and 3 as NC, whereas TPS79533 uses Pin 1 for EN and Pin 3 for GND - requiring PCB redesign and netlist changes for substitution.
TPS71533DCKRM3 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):
- 3.3V
- 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
TPS71533DCKRM3 FAQ
1.How can I place an order for TPS71533DCKRM3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS71533DCKRM3 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 TPS71533DCKRM3 reliable?
The price and inventory of TPS71533DCKRM3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS71533DCKRM3 is usually 5 days.
3.What payment methods are accepted for TPS71533DCKRM3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS71533DCKRM3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS71533DCKRM3?
TPS71533DCKRM3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS71533DCKRM3 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 TPS71533DCKRM3?
For technical support, including TPS71533DCKRM3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS71533DCKRM3 requirements.
6.How does Aetrix verify that TPS71533DCKRM3 is sourced from the original manufacturer or authorized distributors?
All TPS71533DCKRM3 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 TPS71533DCKRM3 meets industry standards.
7.What is the process for return or replacement of TPS71533DCKRM3?
All TPS71533DCKRM3 units undergo pre-shipment inspection (PSI). If there is an issue with TPS71533DCKRM3, 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 TPS71533DCKRM3 part is unused and in its original packaging.
Return procedure for TPS71533DCKRM3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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