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Texas Instruments TPS61043DRBT
- Part No.:
- TPS61043DRBT
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
TPS61043DRBT.pdf
- Description:
- IC LED DRVR RGLTR PWM 60MA 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:374
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Product details
Overview
TPS61043DRBT from Texas Instruments is a constant-current white LED driver IC with integrated 400 mA boost switch and 60 mA LED-series switch, operating from 1.8 V to 6 V input, regulating LED current via 252 mV FB reference, and featuring 18 V overvoltage protection - used in smartphone display backlighting where precise PWM dimming and low-quiescent-current shutdown are required.
For engineers reviewing the TPS61043DRBT datasheet, TPS61043DRBT pinout, TPS61043DRBT application, or TPS61043DRBT equivalent, key selection criteria include its 100 Hz–50 kHz PWM brightness control range, 38 µA no-load quiescent current, 8-pin 3 mm × 3 mm VSON package, and dual-switch architecture enabling LED disconnection during shutdown.
Technical Context
The TPS61043DRBT implements pulse-frequency modulation (PFM) with peak-current control (400 mA typical limit), regulating LED current by maintaining 252 mV across an external sense resistor (RS) rather than regulating output voltage. Its dual-MOSFET architecture includes a 30 V/400 mA main boost switch (Q1) and a 30 V/60 mA LED-series switch (Q2), both thermally coupled to the exposed thermal pad tied to GND.
OVP functionality triggers at 17–19 V (typical 18 V) on the OVP pin, clamping output to protect against open-LED faults; undervoltage lockout activates below 1.5 V (typ), and thermal shutdown engages above 160°C. CTRL pin combines enable logic (≥500 µs high to start, ≥32 ms low to shut down) and direct PWM control of Q2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8 V to 6 V - supports single-cell Li-ion, NiMH, or alkaline battery operation without external LDO pre-regulation. |
| LED Current Regulation | Set by external RS; FB regulates voltage across RS to 252 mV (±8 mV) - enables accurate, temperature-stable LED current independent of VIN and LED count. |
| Switching Frequency | Up to 1 MHz - allows use of compact 4.7 µH inductors and 100 nF–1 µF output capacitors, reducing board area and cost. |
| Quiescent Current | 38 µA (typ) in active no-load state - extends battery life in always-on display applications. |
| Shutdown Current | 0.1 µA (typ) - eliminates LED leakage and minimizes standby power draw when disabled. |
| OVP Threshold | 17 V to 19 V (typ 18 V) - protects internal 30 V switch and permits use of 25 V-rated output capacitors for 4-LED strings. |
| CTRL PWM Range | 100 Hz to 50 kHz - supports flicker-free dimming while avoiding audible noise and enabling compatibility with standard MCU timers. |
Pinout & Package
TPS61043DRBT is housed in an 8-pin VSON (DRB) package measuring 3.00 mm × 3.00 mm with an exposed thermal die pad electrically and thermally connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED (Pin 1) | Output of internal LED-series switch (Q2) | Connects directly to cathode of LED string; Q2 disconnects LEDs from GND during shutdown to prevent leakage current. |
| RS (Pin 2) | Sense resistor return node | Completes current path for LED current; voltage across RS is regulated to 252 mV to set LED current (ILED = 0.252 V / RS). |
| VIN (Pin 3) | Main input supply | Accepts 1.8–6 V DC; powers internal bias circuitry and boost switch; requires local 4.7 µF ceramic decoupling. |
| FB (Pin 4) | Feedback input | High-impedance MOSFET gate input monitoring voltage across RS; regulates to 252 mV with ±8 mV tolerance over temperature. |
| CTRL (Pin 5) | Enable + PWM control | Dual-function pin: ≥500 µs high enables device; ≥32 ms low disables it; 100 Hz–50 kHz PWM directly modulates Q2 for linear brightness control. |
| GND (Pin 6) | Power and signal ground | Reference for all internal circuits; must be low-impedance connection; thermal pad is internally bonded to this pin. |
| OVP (Pin 7) | Overvoltage protection monitor | Connected to output capacitor; triggers shutdown if voltage exceeds 17–19 V, protecting Q1 and external components. |
| SW (Pin 8) | Boost switch drain | Drain of internal 30 V/400 mA MOSFET (Q1); connects to inductor and Schottky diode anode in boost topology. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-MOSFET architecture | Combines 400 mA boost switch (Q1) and 60 mA LED-series switch (Q2) - eliminates need for external high-side switch and simplifies layout for series LED strings. |
| Precision current regulation | 252 mV FB reference with ±8 mV tolerance over –40°C to +85°C - ensures stable LED current across battery discharge and temperature variation. |
| Ultra-low shutdown current | 0.1 µA typical - reduces system standby power to negligible levels, critical for portable devices with persistent display states. |
| Programmable OVP threshold | 17–19 V (typ 18 V); disable OVP by grounding OVP pin - enables flexible design for 4-LED (≤16 V) or higher-voltage strings up to 28 V. |
| PFM peak-current control | Self-regulating discontinuous conduction mode (DCM) with 4.5 µs max on-time and 400 ns min off-time - maintains >80% efficiency across 1–20 mA LED loads without compensation components. |
Applications
| Smartphone Display Backlight | Handheld Medical Device Indicator |
|---|---|
Use Scenario: Driving 4-series white LEDs in a compact OLED/LCD backlight module powered by a single 3.7 V Li-ion cell with dynamic brightness scaling. IC Role / Device Role / Timing Role: Constant-current LED driver with integrated boost converter and PWM-controlled LED-series switch - regulates current independently of battery voltage sag and LED forward-voltage drift. Use Value: Enables flicker-free 100:1 dimming using MCU-generated 10 kHz PWM on CTRL, while 38 µA quiescent current extends standby time between user interactions. | Use Scenario: Illuminating status LEDs on a battery-powered handheld ECG monitor requiring reliable visual feedback under varying ambient light and temperature. IC Role / Device Role / Timing Role: Low-power LED current source with OVP and thermal shutdown - ensures safe, consistent LED intensity despite fluctuating input voltage and potential open-circuit faults. Use Value: 0.1 µA shutdown current prevents battery drain during sleep mode; 18 V OVP protects against LED-string open-circuit failure without external protection circuitry. |
| PDA Sidelight Module | Industrial HMI Panel Backlight |
Use Scenario: Powering edge-lit white LEDs along the bezel of a legacy PDA with 1.8–3.3 V input rails and space-constrained PCB layout. IC Role / Device Role / Timing Role: Compact boost-based constant-current driver in 3 mm × 3 mm VSON - delivers regulated current to 2–3 series LEDs using minimal external components (1 inductor, 1 diode, 1 sense resistor). Use Value: 1 MHz switching frequency allows use of 4.7 µH shielded inductor <1.2 mm height, meeting strict mechanical envelope requirements while achieving >85% efficiency. | Use Scenario: Backlighting a ruggedized industrial touchscreen panel operating in –40°C to +85°C ambient with wide-input 2.7–5.5 V supply. IC Role / Device Role / Timing Role: Temperature-stable LED driver with –40°C to +125°C junction rating and 252 mV FB reference - maintains consistent luminance across extreme environmental conditions. Use Value: Integrated thermal shutdown (160°C) and UVLO (1.5 V) prevent malfunction during cold-start or brownout events, improving system reliability in unattended operation. |
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 |
|---|---|---|---|
| TPS61042DRBT | Same pinout and package; lacks OVP circuit - maximum output limited to 16 V without external protection. | Suitable only for fixed 3–4 LED strings with guaranteed load continuity; not recommended for open-circuit-prone environments. | Select when OVP is unnecessary and BOM cost reduction is prioritized over fault protection. |
| MAX1910EUT+T | 28 V boost switch; 300 mA switch current; no integrated LED-series switch - requires external high-side FET for LED disconnection. | Supports higher-output-voltage LED strings but increases component count and layout complexity. | Choose when driving >4 LEDs or needing >20 mA per string with discrete control over LED disconnect timing. |
Compared with TPS61043DRBT, TPS61042DRBT removes OVP to reduce cost but sacrifices fault protection, while MAX1910EUT+T offers higher voltage headroom at the expense of added external components and no native LED-switch shutdown - making TPS61043DRBT optimal for compact, safety-conscious, battery-powered backlight designs.
Availability
TPS61043DRBT is available at Aetrix Electronics and suitable for smartphone display backlighting, handheld medical indicator modules, and industrial HMI panel backlighting requiring stable component supply, long-term manufacturability, and automotive-grade reliability screening.
Supply support for TPS61043DRBT 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, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The TPS6104x family is designed specifically for space-constrained, battery-powered white LED backlighting applications - emphasizing ultra-low quiescent current, integrated protection features, and simplified bill-of-materials through dual-switch integration.
FAQ
What is the minimum input voltage required for TPS61043DRBT to operate?
The TPS61043DRBT has an undervoltage lockout (UVLO) threshold of 1.5 V (typical), meaning it will not begin switching until VIN rises above approximately 1.7 V. Stable operation occurs within the specified 1.8 V to 6 V input range; operation below 1.8 V may result in intermittent regulation or reduced output capability. The TPS61043DRBT is therefore well-suited for single-cell alkaline or NiMH systems, as well as partially discharged Li-ion cells.
How is LED current set on the TPS61043DRBT?
LED current is set by an external sense resistor (RS) connected between the RS pin and the LED anode. The TPS61043DRBT regulates the voltage across RS to 252 mV (typical), so ILED = 0.252 V / RS. For example, a 13 Ω resistor yields ~19.4 mA. The FB pin monitors this voltage with high impedance (100 nA bias current), ensuring minimal error. This method provides stable current regulation independent of input voltage or LED forward-voltage variation.
Can the TPS61043DRBT drive more than four white LEDs?
When using the integrated OVP function (OVP pin connected to output), the TPS61043DRBT limits output to ≤18 V, supporting up to four typical white LEDs (3.0–3.6 V each). If OVP is disabled by grounding the OVP pin, the device can generate up to 28 V output - sufficient for five or six LEDs - but external overvoltage protection becomes mandatory to avoid exceeding the 30 V absolute maximum rating of the internal switch.
Does the TPS61043DRBT require external compensation components?
No, the TPS61043DRBT uses inherent stability from its PFM peak-current control architecture and operates reliably in discontinuous conduction mode (DCM) without external compensation. The control loop is fully internal, eliminating the need for loop compensation capacitors or resistors - simplifying design, reducing BOM count, and improving layout robustness across varying LED loads and input conditions.
What happens to the LEDs during TPS61043DRBT shutdown?
During shutdown - triggered by holding CTRL low for ≥32 ms - the internal LED-series switch (Q2) opens, physically disconnecting the LED string from GND. This prevents leakage current through the LEDs and eliminates residual glow, even with high-impedance or floating outputs. Unlike basic boost drivers, the TPS61043DRBT guarantees true LED isolation, which is essential for zero-power display states in portable equipment.
TPS61043DRBT 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):
- 1.8V
- Voltage - Supply (Max):
- 6V
- Voltage - Output:
- 16.9V
- Current - Output / Channel:
- 60mA
- 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)
TPS61043DRBT FAQ
1.How can I place an order for TPS61043DRBT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61043DRBT 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 TPS61043DRBT reliable?
The price and inventory of TPS61043DRBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61043DRBT is usually 5 days.
3.What payment methods are accepted for TPS61043DRBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61043DRBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61043DRBT?
TPS61043DRBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61043DRBT 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 TPS61043DRBT?
For technical support, including TPS61043DRBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61043DRBT requirements.
6.How does Aetrix verify that TPS61043DRBT is sourced from the original manufacturer or authorized distributors?
All TPS61043DRBT 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 TPS61043DRBT meets industry standards.
7.What is the process for return or replacement of TPS61043DRBT?
All TPS61043DRBT units undergo pre-shipment inspection (PSI). If there is an issue with TPS61043DRBT, 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 TPS61043DRBT part is unused and in its original packaging.
Return procedure for TPS61043DRBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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