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Texas Instruments TPS62243QDDCRQ1
- Part No.:
- TPS62243QDDCRQ1
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
TPS62243QDDCRQ1.pdf
- Description:
- IC REG BUCK 1.8V 300MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,988
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Product details
Overview
TPS62243QDDCRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering up to 300 mA output current with fixed 1.80 V output voltage, operating from 2.0 V to 6.0 V input, and featuring 2.25 MHz fixed-frequency PWM mode with automatic PFM transition for ultra-low quiescent current (15 μA typical) - used in Remote Keyless Entry (RKE) and Passive Entry Passive Start (PEPS) key fobs.
For engineers reviewing the TPS62243QDDCRQ1 datasheet, TPS62243QDDCRQ1 pinout, TPS62243QDDCRQ1 application, or TPS62243QDDCRQ1 equivalent, key selection considerations include its TSOT-23-5 package footprint, 1.80 V fixed output accuracy (±1.5% in PWM mode), 100% duty-cycle low-dropout capability, thermal shutdown (140°C), and undervoltage lockout (1.85 V falling threshold).
Technical Context
The TPS62243QDDCRQ1 implements a fast-response voltage-mode control architecture with input voltage feed-forward, enabling stable regulation with small ceramic capacitors and supporting discontinuous conduction mode (DCM) during light-load PFM operation. Its dual-MOSFET synchronous topology integrates high-side (240–480 mΩ) and low-side (180–380 mΩ) switches with cycle-by-cycle current limiting (0.54–0.95 A).
Functional modes include soft-start (250 μs VOUT ramp), enable-controlled sequencing (EN pin logic thresholds: VIH = 1 V, VIL = 0.35 V), and thermal shutdown with 20°C hysteresis. The device transitions automatically between PWM and PFM based on load, maintaining ≥75% efficiency at 1 mA and >90% at 100 mA under VIN = 3.6 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.80 V ±1.5% in PWM mode - eliminates external feedback resistors and ensures precise rail generation for MCU cores or RF transceivers. |
| Input Voltage Range | 2.0 V to 6.0 V - supports Li-MnO₂ coin cells (2.0–3.6 V), 2S/3S alkaline, and standard 3.3 V/5 V rails without external pre-regulation. |
| Max Output Current | 300 mA at VIN > 2.3 V - sufficient for low-power automotive microcontrollers, sensors, and transceivers in compact RKE modules. |
| Switching Frequency | 2.25 MHz (±12.5%) - enables use of tiny 2.2 µH inductors and 10 µF ceramic output capacitors for minimal PCB area. |
| Quiescent Current | 15 µA typical in PFM mode - extends battery life in always-on automotive key fobs with multi-year standby requirements. |
| Shutdown Current | <1 µA at EN = GND - ensures negligible drain during vehicle sleep mode, critical for ISO 16750-2 compliance. |
| Thermal Protection | 140°C junction shutdown with 20°C hysteresis - prevents thermal runaway in sealed PEPS enclosures without heatsinking. |
Pinout & Package
TPS62243QDDCRQ1 is housed in a TSOT-23-5 package (2.90 mm × 1.60 mm, 0.95 mm height), optimized for space-constrained automotive modules. Pin functions are validated per TI SLVSEK3 datasheet Section 6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Accepts 2.0–6.0 V supply; requires local 4.7 µF ceramic decoupling to suppress switching noise and prevent input rail collapse. |
| GND (Pin 2) | Power ground | Primary return path for high-frequency switch currents; must be connected to low-impedance ground plane beneath IC. |
| EN (Pin 3) | Enable control | Active-high logic input (VIH ≥ 1 V); ties to upstream power rail or MCU GPIO for controlled power sequencing in multi-rail systems. |
| FB (Pin 4) | Feedback reference | Internally connected to fixed 1.80 V divider; must be shorted directly to VOUT capacitor for stable regulation - no external resistor network needed. |
| SW (Pin 5) | Switch node | Drives external 2.2 µH inductor; carries high di/dt square-wave current - requires shortest possible trace to minimize EMI and voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Rated for –40°C to +125°C junction temperature - certified for under-hood and door-module environments without derating. |
| 100% duty-cycle operation | Enables dropout as low as VIN − VOUT ≈ 100 mV at light loads - maximizes usable battery voltage range in coin-cell-powered RKE fobs. |
| PFM/PWM auto-transition | Maintains >75% efficiency from 0.01 mA to 300 mA load - eliminates manual mode selection and ensures optimal power conversion across all operating states. |
| Low-noise PFM mode | Uses single-threshold comparator and time-controlled pulses - limits output voltage ripple to <15 mVpp in light-load conditions without external compensation. |
| Integrated current limiting | High-side and low-side MOSFETs protected by independent comparators (ILIMF = 0.54–0.95 A) - prevents damage during short-circuit or cold-cranking events. |
Applications
| Remote Keyless Entry (RKE) | Passive Entry Passive Start (PEPS) |
|---|---|
Use Scenario: Compact key fob powered by CR2032 coin cell, transmitting encrypted signals at 315/433 MHz upon button press or proximity detection. IC Role / Device Role / Timing Role: Primary 1.80 V power rail generator for sub-GHz transceiver and ultra-low-power MCU, enabling fast wake-up and transmission within 100 ms. Use Value: 15 µA quiescent current extends shelf life beyond 5 years; 2.25 MHz switching avoids AM radio band interference; TSOT-23-5 footprint fits <80 mm² PCB area. |
Use Scenario: Vehicle door handle module with capacitive sensing and UWB anchor, requiring always-on 1.80 V supply for wake-up logic and secure authentication. IC Role / Device Role / Timing Role: Always-on buck regulator supplying real-time clock, sensor interface, and cryptographic accelerator - maintains timing integrity during deep sleep. Use Value: Undervoltage lockout (1.85 V) prevents erratic behavior as battery depletes; thermal shutdown protects against enclosure heating during repeated authentication attempts. |
| Front Camera Power Supply | Park Assist Sensor Interface |
Use Scenario: Low-light automotive front camera module in ADAS domain controller, requiring clean, stable 1.80 V for image signal processor (ISP) core voltage. IC Role / Device Role / Timing Role: Point-of-load regulator placed adjacent to ISP die, minimizing IR drop and noise coupling into analog pixel paths. Use Value: Fast-response voltage-mode control rejects line transients from engine cranking (ISO 16750-2 pulse 4a); 1.5% output accuracy ensures consistent ISP clocking and ADC reference stability. |
Use Scenario: Ultrasonic park assist ECU with 4–8 transducers, needing regulated 1.80 V for microcontroller, driver ICs, and echo processing ASICs. IC Role / Device Role / Timing Role: Secondary power stage downstream of main 5 V rail, providing isolated, low-noise supply for timing-critical echo sampling circuits. Use Value: 2.25 MHz switching allows use of 1.2 mm × 1.0 mm inductors - reduces board area by 40% vs 500 kHz alternatives; PFM mode silences switching noise during echo acquisition windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62244QDDCRQ1 | Fixed 1.25 V output (vs. 1.80 V); identical package, pinout, and electrical specs otherwise. | Targets 1.25 V digital rails (e.g., FPGA I/O banks, low-voltage ADCs) instead of 1.8 V MCU cores or RF biasing. | Select when system requires 1.25 V - no layout change needed, but verify load compatibility with lower output voltage. |
| TPS62825AQDDCRQ1 | Higher 3.6 V max input, 1.0–5.5 V adjustable output, 2.0 A rating, and 4.0 MHz switching - newer-generation automotive buck with enhanced efficiency. | Designed for higher-current ADAS SoCs or multi-rail power trees where programmability and scalability matter more than minimal size. | Choose for future-proof designs needing >300 mA or adjustable outputs; not drop-in due to different pinout and higher BOM cost. |
Compared with TPS62244QDDCRQ1, the TPS62243QDDCRQ1 provides higher output voltage for 1.8 V logic domains, while TPS62825AQDDCRQ1 offers greater flexibility and headroom at the expense of footprint and complexity - making TPS62243QDDCRQ1 optimal for cost- and space-sensitive RKE/PEPS modules.
Availability
TPS62243QDDCRQ1 is available at Aetrix Electronics and suitable for Remote Keyless Entry (RKE), Passive Entry Passive Start (PEPS), and Front Camera Power Supply applications requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.
Supply support for TPS62243QDDCRQ1 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 automotive-grade power management solutions, with decades of automotive qualification expertise and broad manufacturing scale.
The TPS6224x-Q1 product line was designed specifically for ultra-low-power, space-constrained automotive body electronics - prioritizing AEC-Q100 Grade 1 reliability, minimal quiescent current, and TSOT-23 integration for key fobs, door modules, and sensor nodes.
FAQ
What is the output voltage tolerance of the TPS62243QDDCRQ1 in PWM mode?
The TPS62243QDDCRQ1 delivers a fixed 1.80 V output with ±1.5% accuracy in PWM mode across temperature and line conditions, as specified in TI SLVSEK3 Section 7.5. This tight tolerance ensures reliable operation of 1.8 V I/O interfaces and core logic in automotive MCUs without external trimming or calibration - critical for functional safety compliance in RKE and PEPS systems.
Does the TPS62243QDDCRQ1 require external feedback resistors?
No, the TPS62243QDDCRQ1 does not require external feedback resistors. Its FB pin is internally connected to a precision resistor divider set for 1.80 V output; per datasheet Section 6, FB must be directly tied to the output capacitor. This simplifies layout, eliminates resistor tolerance errors, and improves long-term stability - a key advantage over adjustable buck converters in safety-critical automotive modules.
What is the minimum input voltage required for regulation at full 300 mA load?
The minimum input voltage for regulation at 300 mA depends on load, inductor DCR, and MOSFET RDS(on). Per Section 8.4.2.1, VINmin ≈ VOUT + IOUT × (RDS(on)max + RL). With RDS(on)max = 480 mΩ, RL = 110 mΩ (LPS3015), and VOUT = 1.80 V, VINmin ≈ 2.05 V - confirming compatibility with 2.0 V minimum input rating and enabling full 300 mA output from fresh Li-MnO₂ coin cells.
How does the TPS62243QDDCRQ1 behave during cold-cranking events?
During cold-cranking (ISO 16750-2 Pulse 4a: 3.5 V for 15 ms), the TPS62243QDDCRQ1 remains operational down to 2.0 V input and enters 100% duty-cycle mode to sustain 1.80 V output. Its undervoltage lockout (UVLO) threshold of 1.85 V prevents erratic restarts, and thermal shutdown (140°C) protects against sustained overload - ensuring uninterrupted function in engine-start scenarios.
Can the TPS62243QDDCRQ1 be used with a 1.0 µH inductor?
No - the TPS62243QDDCRQ1 is characterized and guaranteed for stable operation only with inductors from 1.5 µH to 4.7 µH (Section 7.3). A 1.0 µH inductor falls below the 1.5 µH minimum, risking instability, excessive ripple, and potential current-limit triggering. TI recommends 2.2 µH (e.g., Coilcraft LPS3015) for optimal PFM/PWM transition and EMI performance.
TPS62243QDDCRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 300mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
TPS62243QDDCRQ1 FAQ
1.How can I place an order for TPS62243QDDCRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62243QDDCRQ1 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 TPS62243QDDCRQ1 reliable?
The price and inventory of TPS62243QDDCRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62243QDDCRQ1 is usually 5 days.
3.What payment methods are accepted for TPS62243QDDCRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62243QDDCRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62243QDDCRQ1?
TPS62243QDDCRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62243QDDCRQ1 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 TPS62243QDDCRQ1?
For technical support, including TPS62243QDDCRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62243QDDCRQ1 requirements.
6.How does Aetrix verify that TPS62243QDDCRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS62243QDDCRQ1 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 TPS62243QDDCRQ1 meets industry standards.
7.What is the process for return or replacement of TPS62243QDDCRQ1?
All TPS62243QDDCRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS62243QDDCRQ1, 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 TPS62243QDDCRQ1 part is unused and in its original packaging.
Return procedure for TPS62243QDDCRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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