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Texas Instruments TPS61043DRBR
- Part No.:
- TPS61043DRBR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
TPS61043DRBR.pdf
- Description:
- IC LED DRVR RGLTR PWM 60MA 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:8,484
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Product details
Overview
TPS61043DRBR 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 and PDA display backlighting.
For engineers reviewing the TPS61043DRBR datasheet, TPS61043DRBR pinout, TPS61043DRBR application, or TPS61043DRBR equivalent, key selection criteria include PWM dimming compatibility (100 Hz–50 kHz), OVP threshold (17–19 V), internal 30-V MOSFET rating, 3 mm × 3 mm VSON-8 package thermal performance (RθJA = 48.6 °C/W), and shutdown current (0.1 µA typical).
Technical Context
The TPS61043DRBR implements pulse-frequency modulation (PFM) with peak-current control (400 mA typical limit) and fixed 4.5 µs max on-time, enabling high efficiency across wide LED current ranges. It regulates LED current by maintaining 252 mV across external sense resistor RS via high-impedance FB pin.
Its dual-switch architecture separates power conversion (SW/Q1) from LED current path (LED/Q2), allowing independent shutdown of LEDs during disable mode. Overvoltage protection triggers at 17–19 V on OVP pin, clamping output to protect Q1 and external components.
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 pre-regulation. |
| LED Current Regulation | 252 mV FB reference voltage - sets precise LED current via external RS (e.g., 13 Ω → ~19.4 mA). |
| OVP Threshold | 17–19 V - limits output to protect internal 30-V switch and enables use of 25-V output capacitors. |
| Switch Current Limit | 320–480 mA - defines maximum inductor peak current for stable PFM operation and thermal margin. |
| Shutdown Current | 0.1 µA typical - minimizes battery drain in standby mode for portable devices. |
| CTRL PWM Range | 100 Hz to 50 kHz - supports flicker-free dimming while avoiding audible noise and EMI concerns. |
| Package Thermal Resistance | RθJA = 48.6 °C/W - enables >300 mW power dissipation in standard PCB layouts with 2 oz copper. |
Pinout & Package
TPS61043DRBR uses an 8-pin VSON (DRB) package, 3.00 mm × 3.00 mm body size, with exposed thermal pad connected to GND for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED (Pin 1) | LED switch source | Connects cathodes of series LEDs; internal 60 mA MOSFET disconnects LEDs from ground during shutdown. |
| RS (Pin 2) | Current sense return | Completes current path for LED current; voltage across RS sets LED current via FB regulation. |
| VIN (Pin 3) | Power input | Supplies internal bias and boost converter; requires ≥4.7 µF ceramic input capacitor for stability. |
| FB (Pin 4) | Feedback input | High-impedance node sensing RS voltage; regulates to 252 mV to maintain constant LED current. |
| CTRL (Pin 5) | Enable/PWM control | Combined function: ≥500 µs high enables device; ≥32 ms low disables LED path; PWM signal dims LEDs. |
| GND (Pin 6) | Ground reference | Common return for VIN, FB, CTRL, OVP, and thermal pad; must be low-inductance connection. |
| OVP (Pin 7) | Overvoltage monitor | Monitors output voltage; triggers shutdown if >19 V; connect to output capacitor or tie to GND for >28 V operation. |
| SW (Pin 8) | Boost switch drain | Drain of internal 400 mA, 30-V MOSFET; connects to inductor and Schottky diode anode. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 400 mA boost switch | Eliminates external high-voltage MOSFET; supports up to 4-series white LEDs with <16.9 V output. |
| 252 mV precision FB reference | Enables ±3% LED current accuracy over temperature and input voltage variation without trimming. |
| 18 V overvoltage protection | Prevents damage during open-circuit LED failure or disconnection; allows safe use of cost-effective 25 V capacitors. |
| 0.1 µA shutdown current | Extends battery life in always-on portable devices by minimizing quiescent drain when LEDs are off. |
| 3 mm × 3 mm VSON-8 package | Reduces board area by >40% vs SOIC-8; thermal pad improves power handling in space-constrained handhelds. |
Applications
| Smartphone Backlight | PDA Display Sidelight |
|---|---|
Use Scenario: Driving 3–4 white LEDs in series for LCD backlight in compact mobile handsets with single-cell battery supply. IC Role / Device Role / Timing Role: Constant-current boost controller regulating LED brightness via PWM on CTRL pin while maintaining 252 mV across RS. Use Value: Enables flicker-free dimming down to 1% duty cycle with no color shift, leveraging 100 Hz–50 kHz CTRL bandwidth. | Use Scenario: Powering edge-lit monochrome or color LCDs in enterprise PDAs requiring low quiescent current and robust OVP. IC Role / Device Role / Timing Role: Current-source LED driver with integrated OVP and thermal shutdown, managing LED string current independently of battery voltage sag. Use Value: Delivers stable luminance across 1.8–6 V input range and prevents catastrophic failure during LED open-circuit events. |
| Handheld Medical Display | Industrial HMI Panel |
Use Scenario: Illuminating critical diagnostic displays in battery-powered medical instruments where reliability and low shutdown current are mandatory. IC Role / Device Role / Timing Role: Safety-enhanced LED driver with 0.1 µA shutdown current and 160°C thermal shutdown, isolating LEDs during fault conditions. Use Value: Meets IEC 60601 leakage current requirements and extends runtime between charges in portable diagnostics tools. | Use Scenario: Backlighting ruggedized human-machine interface panels in factory environments with wide ambient temperature swings (–40°C to +85°C). IC Role / Device Role / Timing Role: High-efficiency boost LED driver operating in discontinuous conduction mode (DCM) to maintain >80% efficiency at partial load. Use Value: Reduces thermal stress on PCB and maintains consistent brightness across industrial temperature range without derating. |
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 |
|---|---|---|---|
| TPS61042DRBR | Same pinout and package; lacks OVP circuit - OVP pin not implemented; max output limited to 16 V by internal clamp. | Suitable only where LED string is guaranteed intact; cannot tolerate open-circuit faults. | Select when OVP is unnecessary and BOM cost reduction is prioritized over fault protection. |
| MAX16832ATA+T | 16-pin TQFN; requires external MOSFET; supports higher LED currents (up to 1 A); no integrated OVP. | Targets high-brightness industrial lighting; needs additional layout area and gate-drive design effort. | Choose for >60 mA LED strings or when programmable current setting via I2C is required. |
Compared with TPS61043DRBR, TPS61042DRBR removes overvoltage protection to reduce cost but sacrifices fault tolerance, while MAX16832ATA+T trades integration for scalability and higher current capability - making TPS61043DRBR optimal for compact, safety-aware portable backlighting.
Availability
TPS61043DRBR is available at Aetrix Electronics and suitable for smartphone backlighting, PDA display sidelight, and handheld medical device illumination requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS61043DRBR 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 was designed specifically for space-constrained portable LED backlighting applications, emphasizing ultra-low shutdown current, integrated protection, and minimal external component count.
FAQ
What is the maximum number of white LEDs the TPS61043DRBR can drive in series?
The TPS61043DRBR can drive up to four white LEDs in series when using the integrated overvoltage protection (OVP) feature, which limits output to 16.9 V. With OVP disabled (OVP pin tied to GND), the device supports outputs up to 28 V, enabling more LEDs depending on forward voltage drop - e.g., five 3 V LEDs (15 V total) remain within safe operating range. The actual count depends on LED VF and input voltage headroom.
How does the TPS61043DRBR regulate LED current without a current-sense amplifier?
The TPS61043DRBR regulates LED current by directly monitoring the voltage across an external sense resistor (RS) via the FB pin, holding it at a precise 252 mV (typical) reference. This eliminates need for a separate current-sense amplifier - the internal error comparator adjusts the boost switch duty cycle to maintain that voltage, thereby setting LED current as ILED = 0.252 V / RS. This method ensures accuracy independent of input voltage or LED count.
Can the TPS61043DRBR operate with input voltages below 1.8 V?
No - the TPS61043DRBR has a specified minimum input voltage of 1.8 V per its recommended operating conditions, and undervoltage lockout (UVLO) disables operation below 1.5 V (typical). Attempting to operate below 1.8 V risks unstable regulation, reduced efficiency, or failure to start. For sub-1.8 V battery applications, consider TI's TPS6106x series or discrete boost + current-source alternatives.
What is the purpose of the exposed thermal pad on the TPS61043DRBR VSON package?
The exposed thermal pad on the TPS61043DRBR's DRB package must be soldered to a GND-connected copper pour to provide a low-thermal-resistance path from the die to the PCB. It reduces junction-to-board thermal resistance (RθJB = 23.8 °C/W) and improves power handling - enabling sustained operation at full load without exceeding 125°C junction temperature under typical airflow conditions.
Does the TPS61043DRBR support analog brightness control in addition to PWM?
Yes - while PWM dimming via the CTRL pin is primary, the TPS61043DRBR supports analog brightness control using an external resistive divider network applied to the FB pin, as detailed in Section 9.1.3 of the datasheet. This configuration replaces direct RS sensing with adjustable reference biasing, enabling linear analog dimming without PWM artifacts - though it requires additional passive components and careful layout to avoid noise coupling into the high-impedance FB node.
TPS61043DRBR 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)
TPS61043DRBR FAQ
1.How can I place an order for TPS61043DRBR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61043DRBR 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 TPS61043DRBR reliable?
The price and inventory of TPS61043DRBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61043DRBR is usually 5 days.
3.What payment methods are accepted for TPS61043DRBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61043DRBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61043DRBR?
TPS61043DRBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61043DRBR 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 TPS61043DRBR?
For technical support, including TPS61043DRBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61043DRBR requirements.
6.How does Aetrix verify that TPS61043DRBR is sourced from the original manufacturer or authorized distributors?
All TPS61043DRBR 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 TPS61043DRBR meets industry standards.
7.What is the process for return or replacement of TPS61043DRBR?
All TPS61043DRBR units undergo pre-shipment inspection (PSI). If there is an issue with TPS61043DRBR, 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 TPS61043DRBR part is unused and in its original packaging.
Return procedure for TPS61043DRBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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