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Texas Instruments TPS561246DRLR
- Part No.:
- TPS561246DRLR
- Manufacturer:
- Texas Instruments
- Package:
- SOT-563, SOT-666
- Datasheet:
-
TPS561246DRLR.pdf
- Description:
- IC REG BUCK ADJ 1A SOT563
- Quantity:
- Payment:
- Shipping:
Inventory:3,735
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Product details
Overview
TPS561246DRLR from Texas Instruments is a 1A synchronous buck converter in SOT563 package, operating from 4.2V to 17V input and delivering 0.6V–7V output with ±1.5% reference accuracy, 1280kHz fixed-frequency operation (FCCM mode), and integrated 100mΩ/55mΩ MOSFETs. It powers Wi-Fi access points and small business routers requiring stable, low-ripple DC/DC conversion.
For engineers reviewing the TPS561246DRLR datasheet, TPS561246DRLR pinout, TPS561246DRLR application, or TPS561246DRLR equivalent, key selection factors include FCCM-mode ripple control, D-CAP3™ fast transient response, prebiased start-up support, thermal shutdown at 155°C, and compatibility with ultra-low-ESR ceramic output capacitors without external compensation.
Technical Context
The TPS561246DRLR implements D-CAP3™ adaptive on-time control with internal ramp injection for stability across ceramic and polymer capacitors. Its FCCM mode enforces continuous conduction down to light load, maintaining fixed 1280kHz switching frequency and minimizing output voltage ripple-critical for noise-sensitive RF and communication circuits.
It features cycle-by-cycle valley-current overcurrent protection with negative overcurrent (NOC) detection, hiccup-mode undervoltage protection triggered at 60% of nominal output, and non-latching UVLO with 400mV hysteresis. The device supports large duty cycles up to 95% via frequency foldback below 7V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 17V - supports wide industrial and telecom input rails including 5V, 12V, and 15V systems. |
| Output Voltage Range | 0.6V to 7V - programmable via resistor divider; 0.6V reference enables precise low-voltage core rail generation. |
| Switching Frequency | 1280kHz - fixed-frequency FCCM operation ensures predictable EMI profile and low output ripple under all loads. |
| Max Output Current | 1A continuous - sufficient for powering SoCs, PHYs, and RF front-ends in compact networking equipment. |
| Reference Accuracy | ±1.5% over –40°C to 125°C - ensures tight regulation across temperature for reliable system-level timing and signal integrity. |
| Integrated FETs | 100mΩ HS / 55mΩ LS - reduces external component count and improves efficiency at mid-to-high load conditions. |
| Soft-Start Time | 1.4ms internal - prevents inrush current and enables controlled power-up of downstream logic and analog circuitry. |
| Operating Junction Temp | –40°C to 125°C - qualified for industrial and extended-temperature embedded applications. |
Pinout & Package
SOT563 (DRL) package: 1.6mm × 1.6mm, 6-pin surface-mount, thermally enhanced with exposed pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply input | Accepts 4.2–17V DC; requires local 10µF ceramic input capacitor for high-frequency decoupling. |
| SW (Pin 2) | Switch node | Connects between internal HS and LS FETs; drives external inductor and must be routed with minimal loop area. |
| GND (Pin 3) | Power and signal ground | Common return for low-side FET source and control circuitry; FB trace must connect here at single point. |
| BST (Pin 4) | Bootstrap supply | Requires 0.1µF ceramic capacitor to SW for high-side gate drive; critical for proper HS FET turn-on. |
| EN (Pin 5) | Enable control input | Active-high logic interface (1.2V typical threshold); internal 1µA pulldown allows direct connection to VIN via 100kΩ resistor. |
| FB (Pin 6) | Feedback input | Monitors output via resistor divider; sets VOUT = 0.6V × (1 + RFBT/RFBB); high-impedance input minimizes divider current error. |
Key Features
| Feature | Design Value |
|---|---|
| FCCM Mode Operation | Maintains constant 1280kHz switching frequency across full 0–1A load range, reducing output voltage ripple and simplifying EMI filtering. |
| D-CAP3™ Control | Enables stable regulation with zero external compensation components, supporting both ultra-low-ESR ceramic and specialty polymer output capacitors. |
| Prebiased Start-Up | Allows safe startup when output capacitor is precharged; avoids reverse current flow and potential damage to downstream circuitry. |
| Negative Overcurrent Protection | Detects inductor valley current below zero; triggers protective action after eight consecutive NOC events to prevent excessive reverse conduction in FCCM mode. |
| Hiccup-Mode UVP | Shuts down for 13ms then attempts restart upon 60% output undervoltage detection-protects against hard shorts while enabling automatic recovery. |
| Thermal Shutdown | Non-latching protection activates at 155°C junction temperature with 20°C hysteresis, allowing safe cooldown before resuming operation. |
Applications
| WLAN/Wi-Fi Access Point | Small Business Router |
|---|---|
Use Scenario: Powers 2.4GHz/5GHz Wi-Fi SoC and RF front-end ICs in compact indoor access points with limited board space and thermal budget. IC Role / Device Role / Timing Role: Primary 3.3V or 1.05V core supply for WLAN baseband processor and transceiver, delivering clean, low-noise DC with fast load-transient response. Use Value: FCCM mode ensures consistent 1280kHz switching frequency and <8mV ripple during burst traffic, preserving RF signal integrity and EVM performance. | Use Scenario: Supplies CPU, switch fabric, and USB PHY in fanless SOHO routers where acoustic noise and thermal dissipation are constrained. IC Role / Device Role / Timing Role: Main 1.2V or 1.8V logic rail generator with integrated FETs and D-CAP3™ control, eliminating external compensation and reducing BOM count. Use Value: 1.4ms soft-start and prebiased startup prevent brownouts during hot-plug Ethernet or USB events, ensuring deterministic boot sequence. |
| Electricity Meter | STB/DVR |
Use Scenario: Provides isolated auxiliary 3.3V rail for metrology ASIC and real-time clock in smart electricity meters operating across –40°C to 85°C ambient. IC Role / Device Role / Timing Role: Secondary regulated supply derived from main 12V meter bus; operates continuously with high reliability and low standby current. Use Value: ±1.5% reference accuracy and –40°C to 125°C junction rating ensure long-term calibration stability and compliance with IEC 62053 standards. | Use Scenario: Powers video decoder, HDMI PHY, and memory interfaces in set-top boxes and digital video recorders with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise 1.2V or 1.5V supply for video processing subsystems requiring tight ripple control and fast transient immunity. Use Value: Fixed-frequency FCCM operation enables predictable EMI placement above 10MHz, easing FCC/CE radiated emissions certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS561243DRLR | Eco-mode instead of FCCM; 110μA quiescent current vs 350μA; variable frequency at light load. | Better suited for battery-backed or always-on low-power nodes where efficiency at µA loads matters more than ripple. | Select TPS561243DRLR only if light-load efficiency >90% at 100µA is required and output ripple tolerance >15mV is acceptable. |
| MP2315GJ-Z | Monolithic 1.5A buck, 4.5–28V input, 500kHz fixed frequency, no D-CAP3™, requires external compensation. | Higher current capability but larger solution size and less transient performance; lacks prebiased start-up and NOC protection. | Choose MP2315GJ-Z only when input exceeds 17V or 1.5A output is needed, accepting trade-offs in footprint and dynamic response. |
Compared with TPS561243DRLR, the TPS561246DRLR prioritizes output ripple control and EMI predictability over light-load efficiency; compared with MP2315GJ-Z, it delivers superior transient response and smaller total solution size despite lower current rating.
Availability
TPS561246DRLR is available at Aetrix Electronics and suitable for WLAN access points, small business routers, and electricity meters requiring stable component supply, long-term manufacturability, and guaranteed TI original sourcing.
Supply support for TPS561246DRLR 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 power management technologies, with decades of expertise in high-reliability DC/DC conversion.
The TPS56124x product line was designed specifically for space-constrained, cost-sensitive networking and industrial applications needing simple, robust, and low-EMI 1A buck solutions in sub-2mm² packages.
FAQ
What is the primary functional difference between TPS561246DRLR and TPS561243DRLR?
The TPS561246DRLR operates in forced continuous conduction mode (FCCM), maintaining a fixed 1280kHz switching frequency across all load conditions to minimize output voltage ripple. In contrast, the TPS561243DRLR uses Eco-mode, which reduces switching frequency at light loads to improve efficiency-making TPS561246DRLR preferable for noise-sensitive RF applications where consistent EMI behavior is critical.
Does TPS561246DRLR support startup with a precharged output capacitor?
Yes, the TPS561246DRLR supports prebiased start-up. When the output capacitor is precharged, the device delays switching until its internal reference voltage exceeds the feedback voltage (VFB), preventing reverse current flow and ensuring safe, controlled ramp-up. This behavior is confirmed in Section 6.3.3 of the official datasheet and applies specifically to the TPS561246DRLR variant.
What is the maximum duty cycle supported by TPS561246DRLR, and how is it achieved?
The TPS561246DRLR supports up to 95% maximum duty cycle by smoothly reducing switching frequency when input voltage drops below 7V. This frequency foldback extends the on-time to maintain regulation under high-duty-ratio conditions-enabling stable operation down to VIN ≈ VOUT × 1.05. The minimum achievable frequency is approximately 400kHz, as specified in the datasheet's large duty operation section.
Can TPS561246DRLR operate with only ceramic output capacitors?
Yes, the TPS561246DRLR is fully compatible with ultra-low-ESR ceramic output capacitors due to its D-CAP3™ control architecture, which includes internal ripple injection for stability. No external compensation or series resistance is required-unlike traditional voltage-mode controllers. This capability is explicitly validated in the datasheet's Section 6.3.1 and Typical Characteristics (Figures 5-9 to 5-12).
What protection features are implemented in TPS561246DRLR, and how do they behave under fault conditions?
The TPS561246DRLR integrates non-latching UVLO, cycle-by-cycle overcurrent limit (OCL), hiccup-mode undervoltage protection (UVP), and thermal shutdown at 155°C. Under output short-circuit, UVP triggers after 256µs deglitching, initiating 13ms off-time followed by automatic restart. OCL limits peak inductor current to 1.2–3.6A; NOC protection activates if valley current goes negative beyond threshold-eight consecutive events disable switching until recovery.
TPS561246DRLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- TPS56124x
- Package/Case:
- SOT-563, SOT-666
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.2V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 7V
- Current - Output:
- 1A
- Frequency - Switching:
- 1.28MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-563
TPS561246DRLR FAQ
1.How can I place an order for TPS561246DRLR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS561246DRLR 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 TPS561246DRLR reliable?
The price and inventory of TPS561246DRLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS561246DRLR is usually 5 days.
3.What payment methods are accepted for TPS561246DRLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS561246DRLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS561246DRLR?
TPS561246DRLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS561246DRLR 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 TPS561246DRLR?
For technical support, including TPS561246DRLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS561246DRLR requirements.
6.How does Aetrix verify that TPS561246DRLR is sourced from the original manufacturer or authorized distributors?
All TPS561246DRLR 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 TPS561246DRLR meets industry standards.
7.What is the process for return or replacement of TPS561246DRLR?
All TPS561246DRLR units undergo pre-shipment inspection (PSI). If there is an issue with TPS561246DRLR, 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 TPS561246DRLR part is unused and in its original packaging.
Return procedure for TPS561246DRLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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