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Texas Instruments TPS61061DRBRG4
- Part No.:
- TPS61061DRBRG4
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
TPS61061DRBRG4.pdf
- Description:
- IC LED DRVR RGLTR PWM 400MA 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:3,925
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Product details
Overview
TPS61061DRBRG4 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 MOSFET switch and synchronous P-channel rectifier, and supports dual brightness control via ILED (5-bit digital) and EN (PWM up to 1 kHz). It is used in backlighting for compact handheld displays.
For engineers reviewing the TPS61061DRBRG4 datasheet, TPS61061DRBRG4 pinout, TPS61061DRBRG4 application, or TPS61061DRBRG4 equivalent, key selection considerations include its 18-V overvoltage protection threshold, 250-mV/500-mV selectable feedback voltage, digital brightness step resolution (15.6 mV), precharge current limiting during startup, and thermal shutdown with 15°C hysteresis.
Technical Context
The TPS61061DRBRG4 implements peak-current-mode PWM control with a fixed 1-MHz oscillator and internal slope compensation for stable operation above 50% duty cycle. Its synchronous rectification architecture eliminates external diode losses and enables continuous conduction mode only - ensuring low noise and no switch-node ringing.
It integrates dual protection logic: short-circuit detection triggers precharge-mode current limiting (typically 100 mA) when OUT is grounded, while overvoltage protection halts switching when output exceeds 18 V (min), re-enabling only after voltage falls below threshold minus 0.7 V hysteresis.
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 Threshold | 18 V (min) - matches 4-white-LED string (typ. 14.3 V at 20 mA), enabling use of 16-V-rated ceramic capacitors. |
| Feedback Voltage Options | 250 mV (ILED = high) or 500 mV (ILED = GND) - lower VFB reduces sense resistor power loss and improves efficiency by ~2% in low-LED-count configurations. |
| Digital Brightness Control | 5-bit DAC (32 steps), 15.6-mV/step - allows precise, processor-efficient LED current adjustment without continuous PWM generation. |
| Switch Current Limit | 325 mA (min) - sets maximum LED current capability when combined with external sense resistor RS = 12 Ω (e.g., 41.7 mA max at 500 mV). |
| Quiescent Current | 1 mA - ensures minimal battery drain during active operation in portable devices. |
| Shutdown Current | 1 µA (typ) - enables ultra-low-power standby in always-on display systems. |
Pinout & Package
The TPS61061DRBRG4 is housed in an 8-pin 3.0 mm × 3.0 mm QFN package (DRB suffix) with exposed thermal pad (PowerPAD™) that must be soldered to GND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 8) | Input supply rail | Accepts 2.7–6 V; requires 1-µF ceramic input capacitor close to pin for stability and EMI suppression. |
| EN (Pin 2) | Enable / PWM dimming input | Pulled low disables device (1-µA shutdown); PWM ≤1 kHz applied here controls LED on/off timing directly. |
| GND (Pin 1) | Analog ground reference | Reference for FB, ILED, and internal error amplifier; separate from PGND to minimize noise coupling. |
| SW (Pin 6) | Switch node | Connects to inductor and internal N-/P-channel MOSFETs; high dv/dt node requiring tight layout and ground shielding. |
| FB (Pin 4) | Current-sense feedback input | Regulates voltage across RS; set to 250 mV or 500 mV depending on ILED state - determines LED current magnitude. |
| OUT (Pin 7) | Boost output | Drives LED anodes in series configuration; includes OVP clamp and short-circuit detection circuitry. |
| ILED (Pin 3) | Digital brightness control | Logic-level input: GND disables digital control (VFB = 500 mV); high enables 5-bit DAC (VFB = 250 mV baseline). |
| PGND (Pin 5) | Power ground return | Low-impedance return path for inductor and switch currents; must be routed separately from analog GND and tied at single point. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing BOM count and improving efficiency by 5–10% vs. asynchronous boost. |
| Programmable overvoltage protection | 18-V threshold (TPS61061-specific) prevents damage to LEDs and output caps during open-load or thermal runaway. |
| Dual brightness interface | Supports both hardware PWM (EN pin) and low-CPU-overhead digital stepping (ILED pin), enabling flexible system-level dimming strategies. |
| Precharge current limiting | 100-mA fixed precharge during startup avoids inrush into cold LED strings and prevents false short-circuit triggering. |
| Thermal shutdown with hysteresis | Activates at ~160°C junction temperature and releases at ~145°C, preventing thermal cycling and enabling safe recovery under overload. |
Applications
| Smartphone Backlighting | Digital Camera LCD Backlight |
|---|---|
Use Scenario: Driving 4-series white LEDs in a 3.5-inch AMOLED display module powered by a 3.7-V Li-ion battery. 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 matches 4-LED forward voltage margin, while 250-mV feedback mode increases efficiency by ~1.8% versus 500-mV mode at full brightness. |
Use Scenario: Powering a 2.7-inch TFT LCD panel in a compact digital still camera with variable ambient light adaptation. IC Role / Device Role / Timing Role: Dual-mode brightness controller using ILED for coarse 32-step adjustment and EN for fine-grained PWM flicker-free dimming. Use Value: Digital stepping eliminates need for MCU PWM timer resources, extending battery life during preview mode where display updates infrequently. |
| Portable Media Player UI Lighting | Handheld Barcode Scanner Display |
Use Scenario: Illuminating segmented OLED status indicators and navigation keys in a ruggedized media player operating from 2.8–5.5 V input range. IC Role / Device Role / Timing Role: Low-quiescent-current (1 mA) LED driver with shutdown current <10 µA, enabling instant-on functionality after deep sleep. Use Value: Undervoltage lockout (1.65 V) prevents erratic behavior during battery depletion, while 8-pin QFN footprint saves PCB area in space-constrained enclosures. |
Use Scenario: Backlighting a 1.8-inch monochrome LCD in industrial barcode scanners subject to frequent drop shocks and wide temperature swings (–40°C to +85°C). IC Role / Device Role / Timing Role: Robust LED driver with integrated short-circuit protection that limits fault current to 100 mA if LED string is crushed or shorted. Use Value: Precharge mode and thermal shutdown ensure reliable operation during repeated power cycling and mechanical stress, reducing field failure rates. |
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 |
|---|---|---|---|
| TPS61061DRBT | Same die and specs; differs only in tape-and-reel packaging (250-unit reel vs. 3000-unit reel for DRBRG4). | No functional difference; selected for low-volume prototyping or small-batch production. | Choose DRBT for evaluation or pilot runs; DRBRG4 preferred for high-volume manufacturing due to cost-per-unit and logistics efficiency. |
| TPS61062DRBR | Higher 22.2-V OVP threshold, supports up to five LEDs; otherwise identical pinout, package, and control interface. | Required when driving 5-LED strings (e.g., larger displays); not suitable for 4-LED designs without overdesigning OVP margin. | Select TPS61062DRBR only if final design uses five LEDs; TPS61061DRBRG4 provides optimal OVP headroom and cost for four-LED systems. |
Compared with TPS61061DRBT, the TPS61061DRBRG4 offers better supply-chain scalability for volume production; compared with TPS61062DRBR, it delivers tighter OVP matching and reduced output capacitor voltage rating requirements for 4-LED applications.
Availability
TPS61061DRBRG4 is available at Aetrix Electronics and suitable for smartphone backlighting, digital camera displays, portable media player UI lighting, and handheld barcode scanner displays requiring stable component supply across product lifecycles.
Supply support for TPS61061DRBRG4 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 and embedded processing technologies, with leadership in power management ICs for portable and industrial applications.
The TPS6106x family was designed specifically for space-constrained, battery-powered LED backlighting - emphasizing integration (synchronous switches, OVP, short-circuit protection), efficiency at low LED counts, and flexible digital+PWM dimming interfaces.
FAQ
What is the overvoltage protection threshold of the TPS61061DRBRG4?
The TPS61061DRBRG4 has a guaranteed minimum overvoltage protection threshold of 18 V, with typical activation at 18.5 V and hysteresis of 0.7 V. This threshold is factory-set and fixed for the TPS61061 variant, distinguishing it from the 14-V (TPS61060) and 22.2-V (TPS61062) versions in the same family. The OVP circuit disables switching until the output voltage falls below the hysteresis level, protecting downstream LEDs and capacitors.
How does the TPS61061DRBRG4 implement digital brightness control?
The TPS61061DRBRG4 uses a 5-bit internal DAC on the ILED pin to adjust feedback voltage in 15.6-mV steps between 250 mV and 500 mV. Pulling ILED high initiates digital control mode; then applying low pulses of defined duration (1–75 µs to increase, 180–300 µs to decrease) increments or decrements the DAC code. Each step changes LED current proportionally, enabling 32 discrete brightness levels without continuous MCU intervention.
Can the TPS61061DRBRG4 drive more than four LEDs?
No - the TPS61061DRBRG4 is rated and characterized to safely drive up to four white LEDs in series, based on its 18-V overvoltage protection threshold and internal current limit. Attempting to drive five LEDs risks exceeding the OVP threshold under worst-case forward voltage conditions, causing intermittent shutdown. For five-LED strings, TI specifies the TPS61062DRBR (22.2-V OVP) as the correct variant.
What is the purpose of the PGND pin on the TPS61061DRBRG4?
The PGND (Power Ground) pin on the TPS61061DRBRG4 provides a dedicated low-impedance return path for high-frequency switch and inductor currents. It must be routed separately from the analog GND (Pin 1) and connected to the main system ground plane at a single point to prevent noise coupling into the feedback loop. Improper PGND layout causes instability, poor regulation, and increased EMI.
Does the TPS61061DRBRG4 require external compensation components?
No - the TPS61061DRBRG4 features fully internal loop compensation optimized for its fixed 1-MHz switching frequency and synchronous boost topology. No external RC networks or compensation pins are needed. Designers only select the external inductor (22 µH typical), sense resistor (e.g., 12 Ω for ~41.7 mA at 500 mV), and input/output capacitors per the datasheet guidelines.
TPS61061DRBRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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)
TPS61061DRBRG4 FAQ
1.How can I place an order for TPS61061DRBRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61061DRBRG4 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 TPS61061DRBRG4 reliable?
The price and inventory of TPS61061DRBRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61061DRBRG4 is usually 5 days.
3.What payment methods are accepted for TPS61061DRBRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61061DRBRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61061DRBRG4?
TPS61061DRBRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61061DRBRG4 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 TPS61061DRBRG4?
For technical support, including TPS61061DRBRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61061DRBRG4 requirements.
6.How does Aetrix verify that TPS61061DRBRG4 is sourced from the original manufacturer or authorized distributors?
All TPS61061DRBRG4 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 TPS61061DRBRG4 meets industry standards.
7.What is the process for return or replacement of TPS61061DRBRG4?
All TPS61061DRBRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS61061DRBRG4, 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 TPS61061DRBRG4 part is unused and in its original packaging.
Return procedure for TPS61061DRBRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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