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Texas Instruments TPS61061DRBR
- Part No.:
- TPS61061DRBR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
TPS61061DRBR.pdf
- Description:
- IC LED DRVR RGLTR PWM 400MA 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:554
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Product details
Overview
TPS61061DRBR from Texas Instruments is a synchronous boost LED driver IC designed to deliver constant current to up to four white LEDs in series. It operates from 2.7 V to 6 V input, features 1-MHz fixed-frequency PWM control, integrated 400-mA N-channel power switch and synchronous P-channel rectifier, and provides dual brightness control via ILED (5-bit digital) and EN (PWM up to 1 kHz). It is used in compact portable displays requiring precise current regulation and low-noise operation.
For engineers reviewing the TPS61061DRBR datasheet, TPS61061DRBR pinout, TPS61061DRBR application, or TPS61061DRBR equivalent, key selection considerations include its 18-V overvoltage protection threshold, 250-mV/500-mV selectable feedback voltage, 8-pin QFN (3 mm × 3 mm) package with exposed thermal pad, digital brightness programming timing (1–300 µs pulses), and precharge current limiting during startup.
Technical Context
The TPS61061DRBR implements peak-current-mode PWM control with a fixed 1-MHz switching frequency and internal loop compensation. Its architecture integrates an N-channel MOSFET switch (400-mA current limit, 0.6–0.9 Ω RDS(on) at 3.6 V) and synchronous P-channel rectifier (2.5–3.7 Ω RDS(on)), operating exclusively in continuous conduction mode for low noise and no switch-node ringing.
It incorporates dedicated protection logic including undervoltage lockout (1.65 V threshold), thermal shutdown (160°C trip, 15°C hysteresis), advanced short-circuit detection (precharge mode at ≤100 mA when OUT shorted), and programmable overvoltage protection (18 V min threshold, 0.7 V hysteresis). Feedback regulation is set by ILED pin state: GND → 500 mV, high → 250 mV, enabling efficiency optimization based on LED string voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 6.0 V - supports single-cell Li-ion, Li-polymer, or triple-AA battery inputs without external regulation. |
| Output Overvoltage Protection | 18 V (min) - matches 4-white-LED strings (typ. 12–14 V forward), enabling use of low-voltage-rated 25-V output capacitors. |
| Feedback Voltage | 250 mV or 500 mV - selectable via ILED pin; lower value reduces sense resistor power loss and improves efficiency by ~2% for low-Vf strings. |
| Switching Frequency | 1 MHz (0.8–1.2 MHz range) - enables use of small 22-µH inductors and 220-nF ceramic output capacitors, minimizing board area and EMI filter complexity. |
| LED Drive Capability | Up to 4 white LEDs in series - supports typical mobile display backlight configurations with 20–30 mA per string. |
| Efficiency | Up to 80% - measured at 3.6 V input, 4-LED string, 20 mA, with 22-µH inductor and 220-nF output capacitor. |
| Digital Brightness Control | 5-bit DAC (32 steps, 15.6 mV/step) - allows precise, processor-efficient LED current adjustment without continuous PWM generation. |
Pinout & Package
TPS61061DRBR uses an 8-pin QFN package (3.00 mm × 3.00 mm body, 0.5-mm pitch) with exposed thermal diepad (PowerPAD™) that must be soldered to analog ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply | Connects to 2.7–6 V source; requires 1-µF input capacitor close to pin for stability and transient response. |
| EN | Enable / PWM dimming input | Pulled high to enable; accepts PWM signals ≤1 kHz for analog brightness control; includes 300-kΩ internal pulldown. |
| GND | Analog ground reference | Reference for FB, ILED, and EN; must be low-impedance connection to PowerPAD™ and system ground plane. |
| SW | Switch node | Connects to inductor and diode-free synchronous rectifier; carries high dv/dt; requires tight layout to minimize EMI. |
| FB | Current-sense feedback | Regulates LED current by sensing voltage across external Rs; target voltage set to 250 mV or 500 mV by ILED state. |
| OUT | Boost output | Drives LED anode(s); connects to cathodes of series-connected LEDs; tied to PGND through Rs for current sensing. |
| ILED | Digital brightness control | Configures feedback voltage and enables 5-bit DAC programming via timed low pulses (1–300 µs); high = 250 mV base. |
| PGND | Power ground return | Low-impedance return path for inductor and LED current; must be separated from analog GND until joined at single point. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous boost topology | Eliminates external Schottky diode, reducing conduction loss and improving efficiency by ~5–10% vs. asynchronous designs. |
| Integrated OVP and short-circuit protection | 18-V OVP threshold and automatic precharge mode (≤100 mA) prevent damage during LED open/short faults without external circuitry. |
| Dual brightness control interface | Combines hardware-efficient ILED digital control (low MCU overhead) with EN-based PWM dimming (flexible analog adjustment). |
| Precharge current limiting | 100-mA fixed precharge during startup prevents inrush into LED string, ensuring reliable turn-on even with high-Vf LEDs. |
| Thermal-enhanced QFN package | Exposed PowerPAD™ reduces junction-to-board thermal resistance to 23.2°C/W, supporting >400-mA peak switch current in compact layouts. |
Applications
| Smartphone Backlight | Digital Camera LCD |
|---|---|
|
Use Scenario: Driving 4-series white LEDs for main display backlight in space-constrained smartphones with Li-ion battery input. IC Role / Device Role / Timing Role: Constant-current boost controller regulating LED string current at 20 mA with 1-MHz switching to minimize EMI near RF sections. Use Value: 18-V OVP enables safe operation with 4-LED string (≈14 V Vf) while allowing use of low-cost 25-V ceramic output capacitors. |
Use Scenario: Powering high-brightness LCD panel in compact digital still cameras using triple-AA alkaline supply (4.5 V nominal). IC Role / Device Role / Timing Role: Synchronous boost converter delivering stable current despite wide input variation (2.7–6 V), with digital brightness control for UI adaptation. Use Value: 250-mV feedback mode increases efficiency by ~2% at low LED string voltage, extending battery life during preview mode. |
| PDA Display Driver | Handheld Medical Monitor |
|
Use Scenario: Backlighting QVGA TFT display in legacy PDAs with 3.3-V regulated rail or direct battery connection. IC Role / Device Role / Timing Role: Compact LED driver providing PWM-dimmable output with shutdown isolation (LEDs disconnected when EN = low). Use Value: 8-pin QFN footprint (3 mm × 3 mm) and support for 220-nF output capacitor reduce total solution size below 25 mm². |
Use Scenario: Illuminating critical diagnostic display in battery-powered medical handhelds requiring high reliability and fault tolerance. IC Role / Device Role / Timing Role: Fault-protected LED driver with integrated short-circuit detection, UVLO, and thermal shutdown for safety-critical operation. Use Value: Precharge mode limits fault current to ≤100 mA during LED short, preventing thermal runaway and enabling graceful degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61061YZF | Same electrical specs, but in 8-ball NanoFree™ CSP (1.446 mm × 1.446 mm); no exposed thermal pad; higher RθJA (120.8°C/W). | Better suited for ultra-thin, board-area-constrained designs where thermal load is low and reflow profile supports CSP. | Select YZF for minimal footprint; DRBR for better thermal performance and standard QFN assembly compatibility. |
| TPS61062DRBR | Identical package and pinout, but 22.2-V OVP threshold and supports up to 5 LEDs; feedback and dimming functions identical. | Required when driving 5-LED strings (e.g., larger displays); not drop-in for 4-LED designs due to higher OVP trip point. | Choose DRBR if 4-LED count is fixed and 18-V OVP margin is sufficient; upgrade to TPS61062DRBR only for 5-LED expansion. |
Compared with TPS61061YZF, the TPS61061DRBR offers superior thermal management (RθJA 47.6°C/W vs. 120.8°C/W) and standard QFN manufacturability, while TPS61062DRBR extends LED count capability at the cost of reduced OVP margin for 4-LED strings.
Availability
TPS61061DRBR is available at Aetrix Electronics and suitable for smartphone backlighting, digital camera LCDs, PDA displays, and handheld medical monitors requiring stable component supply, consistent parametric performance, and long-term industrial availability.
Supply support for TPS61061DRBR 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 specializing in analog, embedded processing, and power management technologies, with leadership in high-efficiency power conversion and precision analog solutions.
The TPS6106x product line was designed specifically for portable LED backlight applications, emphasizing small solution size, dual dimming interfaces, integrated protection, and efficiency optimization across varying LED string voltages.
FAQ
What is the overvoltage protection threshold for TPS61061DRBR?
The TPS61061DRBR has a minimum overvoltage protection (OVP) threshold of 18 V, with typical trip at 18.5 V and maximum at 19.8 V. This threshold is factory-set and fixed for this variant-unlike the TPS61060 (14 V) or TPS61062 (22.2 V)-and is optimized for reliable operation with 4-white-LED strings. The OVP hysteresis is 0.7 V, ensuring stable recovery after fault clearance. This specification is confirmed in Section 7.5 of the SLVS538B datasheet.
How does digital brightness control work on TPS61061DRBR?
TPS61061DRBR implements digital brightness control via the ILED pin using a built-in 5-bit DAC. When ILED is pulled high, feedback regulation defaults to 250 mV; pulling ILED low for 1–75 µs increments the DAC (15.6 mV/step), and pulling low for 180–300 µs decrements it. Each step changes LED current proportionally. Full-scale range is 32 steps (0–31), with base current set by the external sense resistor Rs. This eliminates need for continuous PWM generation and reduces MCU resource usage.
Can TPS61061DRBR drive more than four LEDs?
No, TPS61061DRBR is rated to drive up to four white LEDs in series, as specified in the device description and confirmed by its 18-V OVP threshold. Attempting to drive five LEDs (typically requiring ≥17.5 V forward voltage) risks exceeding the OVP limit under temperature or process variation, triggering shutdown. For five-LED strings, TI specifies TPS61062DRBR (22.2-V OVP) as the correct variant-pin-compatible but not functionally interchangeable for this requirement.
What is the recommended inductor value for TPS61061DRBR?
The recommended inductor value for TPS61061DRBR is 22 µH, as validated in the typical application circuit and efficiency curves (Figures 4 and 5). A 10-µH inductor is also supported per Section 9.2.2.1, but 22 µH provides better stability and lower peak currents across the full input and load range. Inductor saturation current must exceed the calculated peak inductor current (e.g., >400 mA for 20-mA LED current at 3.6 V input), and core material should be suitable for 1-MHz operation (e.g., shielded ferrite).
Does TPS61061DRBR require an external Schottky diode?
No, TPS61061DRBR does not require an external Schottky diode because it integrates a synchronous P-channel MOSFET rectifier alongside its N-channel power switch. This synchronous rectification replaces the diode, reducing forward voltage drop and conduction losses-improving efficiency by approximately 5–10% compared to asynchronous boost topologies. The SW pin connects directly to the inductor; no external diode is placed between SW and OUT.
TPS61061DRBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 6V
- Voltage - Output:
- 18.5V
- Current - Output / Channel:
- 400mA (Switch)
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SON (3x3)
TPS61061DRBR FAQ
1.How can I place an order for TPS61061DRBR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61061DRBR 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 TPS61061DRBR reliable?
The price and inventory of TPS61061DRBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61061DRBR is usually 5 days.
3.What payment methods are accepted for TPS61061DRBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61061DRBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61061DRBR?
TPS61061DRBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61061DRBR 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 TPS61061DRBR?
For technical support, including TPS61061DRBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61061DRBR requirements.
6.How does Aetrix verify that TPS61061DRBR is sourced from the original manufacturer or authorized distributors?
All TPS61061DRBR 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 TPS61061DRBR meets industry standards.
7.What is the process for return or replacement of TPS61061DRBR?
All TPS61061DRBR units undergo pre-shipment inspection (PSI). If there is an issue with TPS61061DRBR, 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 TPS61061DRBR part is unused and in its original packaging.
Return procedure for TPS61061DRBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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