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Texas Instruments TPS61043DRBRG4
- Part No.:
- TPS61043DRBRG4
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
TPS61043DRBRG4.pdf
- Description:
- IC LED DRVR RGLTR PWM 60MA 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:1,950
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Product details
Overview
TPS61043DRBRG4 from Texas Instruments is a constant-current white LED driver IC with integrated 400 mA boost switch and 60 mA LED switch, operating from 1.8 V to 6 V input, regulating LED current via 252 mV feedback reference across external sense resistor RS, and featuring 18 V overvoltage protection - used in smartphone and PDA display backlighting.
For engineers reviewing the TPS61043DRBRG4 datasheet, TPS61043DRBRG4 pinout, TPS61043DRBRG4 application, or TPS61043DRBRG4 equivalent, key selection considerations include PWM dimming range (100 Hz–50 kHz), shutdown current (0.1 µA), OVP threshold (17–19 V), internal 30-V MOSFET, and QFN-8 package thermal resistance (RθJA = 48.6 °C/W).
Technical Context
The TPS61043DRBRG4 implements pulse-frequency modulation (PFM) with peak-current control, using a 400 mA internal main switch (Q1) and 60 mA LED switch (Q2) to regulate LED current by maintaining 252 mV across RS. It operates in discontinuous conduction mode (DCM), where switching frequency varies with load, input/output voltage, and inductor value.
Overvoltage protection activates at 17–19 V on the OVP pin, clamping output to protect the 30-V-rated internal switch; undervoltage lockout engages below 1.5 V (typ), and thermal shutdown triggers at ~160 °C. The CTRL pin integrates enable logic (500 µs high pulse to start, 32 ms low to shut down) and direct PWM brightness control.
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. |
| LED Current Regulation | Set by external RS; FB regulates voltage across RS to 252 mV (typ) - enables precise, temperature-stable current setting independent of VIN or LED count. |
| OVP Threshold | 17–19 V - limits output to protect internal 30-V switch; allows use of 25-V-rated output capacitors. |
| CTRL PWM Range | 100 Hz to 50 kHz - supports flicker-free dimming while maintaining linear LED current vs. duty cycle. |
| Shutdown Current | 0.1 µA (typ) - minimizes battery drain during system sleep or display-off states. |
| Switching Frequency | Up to 1 MHz - enables use of small 4.7 µH inductors and 100 nF output capacitors for compact layout. |
| Efficiency | Up to 85% - achieved with optimized 4.7 µH inductor and Schottky diode; efficiency remains high across wide LED current range due to DCM operation. |
Pinout & Package
TPS61043DRBRG4 uses an 8-pin VSON (DRB) package, 3.00 mm × 3.00 mm, with exposed thermal pad connected to GND for enhanced power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED (Pin 1) | LED switch source | Connects series LEDs between this pin and RS; internal 60 mA switch disconnects LEDs from GND during shutdown to prevent leakage. |
| RS (Pin 2) | Current sense return | Completes current path through external sense resistor; voltage across RS is regulated to 252 mV to set LED current. |
| VIN (Pin 3) | Main supply input | Accepts 1.8–6 V input; powers internal bias circuitry and main switch driver; requires 4.7 µF input capacitor. |
| FB (Pin 4) | Feedback input | High-impedance input monitoring voltage across RS; regulates converter to maintain 252 mV reference - determines LED current accuracy. |
| CTRL (Pin 5) | Enable/PWM control | Combines device enable (500 µs high pulse) and brightness control (100 Hz–50 kHz PWM); no external pull-up required. |
| GND (Pin 6) | Power ground | Reference for all analog and power circuits; exposed thermal pad must be soldered to PCB ground plane for thermal performance. |
| OVP (Pin 7) | Overvoltage monitor | Connected to output capacitor; triggers shutdown if voltage exceeds 17–19 V - protects internal 30-V switch and external components. |
| SW (Pin 8) | Boost switch drain | Drain of internal 400 mA, 30-V MOSFET; connects to inductor and Schottky diode anode - defines boost stage topology. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 400 mA/30 V boost switch | Eliminates external high-voltage MOSFET; supports up to 4-series white LEDs with 16.9 V max output when OVP enabled. |
| 252 mV precision feedback reference | Enables ±3% LED current accuracy over temperature and input voltage; reduces need for calibration in production. |
| 100 nF minimum output capacitance | Allows ultra-small ceramic CO (e.g., 0603 100 nF) - saves board space and cost versus larger electrolytics or tantalums. |
| 0.1 µA shutdown current | Extends battery life in portable devices during display-off periods; meets stringent energy-efficiency requirements for handhelds. |
| Disconnection of LEDs during shutdown | Prevents reverse leakage current through LEDs when off - avoids unintended glow and preserves contrast ratio in dark-mode UIs. |
Applications
| Smartphone Display Backlight | PDA & Pocket PC Sidelight |
|---|---|
Use Scenario: Driving 3–4 white LEDs in series for LCD backlight in compact mobile handsets with single-cell Li-ion battery (3.0–4.2 V). IC Role / Device Role / Timing Role: Constant-current boost controller regulating LED current via RS, with PWM dimming synchronized to display frame rate. Use Value: Delivers stable brightness across battery discharge curve; 85% efficiency extends talk time; 0.1 µA shutdown current preserves standby duration. | Use Scenario: Powering edge-lit LED arrays for monochrome or color LCDs in legacy PDAs and enterprise handhelds. IC Role / Device Role / Timing Role: High-frequency (up to 1 MHz) boost converter with integrated OVP, enabling compact 3 mm × 3 mm layout and robust fault protection. Use Value: Supports 1.8 V minimum input for deep-discharge operation; 18 V OVP allows safe use of low-cost 25 V ceramic capacitors. |
| Handheld Medical Device Indicator | Industrial Handheld Scanner UI |
Use Scenario: Providing consistent, flicker-free illumination for status LEDs and small graphic displays in battery-powered diagnostic tools. IC Role / Device Role / Timing Role: Analog- or PWM-controlled current source with thermal shutdown and UVLO - ensures reliable operation under variable ambient conditions. Use Value: 125 °C max junction temperature rating and RθJA = 48.6 °C/W support continuous operation in sealed enclosures; 38 µA quiescent current minimizes idle drain. | Use Scenario: Driving multi-segment LED bar graphs and backlight in rugged barcode scanners powered by replaceable AA/AAA cells. IC Role / Device Role / Timing Role: Low-input-voltage (1.8 V) LED driver with programmable current and fast enable/disable - matches intermittent scan-triggered illumination needs. Use Value: 500 µs enable pulse and 32 ms disable timing allow clean integration with microcontroller GPIO; 60 mA LED switch handles discrete indicator loads directly. |
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 | No OVP pin; fixed 18-V output clamp not implemented - requires external OVP or careful output capacitor derating. | Suitable only where output voltage is tightly bounded (e.g., fixed 3–4 LED strings) and external protection is acceptable. | Select TPS61042DRBR only if OVP is unnecessary and board space permits external protection circuitry. |
| MAX1910EUT+T | Lower max LED current (30 mA), no integrated LED switch; requires external high-side current sink and separate enable control. | Better suited for low-current indicator LEDs rather than display backlighting requiring >40 mA per string. | Choose MAX1910EUT+T for ultra-low-power indicator applications where 30 mA suffices and layout flexibility allows discrete switch implementation. |
Compared with TPS61043DRBRG4, TPS61042DRBR lacks integrated overvoltage protection and requires external safety measures, while MAX1910EUT+T offers lower current capability and no integrated LED switch - making TPS61043DRBRG4 the only option supporting 4-LED strings with built-in OVP, shutdown disconnection, and single-pin PWM control in a 3×3 mm QFN.
Availability
TPS61043DRBRG4 is available at Aetrix Electronics and suitable for smartphone display backlighting, PDA sidelight systems, handheld medical device indicators, industrial scanner UIs, and battery-powered portable instrumentation requiring stable component supply and long-term manufacturability.
Supply support for TPS61043DRBRG4 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, personal electronics, and communications markets.
The TPS61043DRBRG4 belongs to TI's LED lighting driver product line, designed specifically for compact, high-efficiency constant-current boost solutions in space-constrained portable devices with single-cell battery inputs.
FAQ
What is the maximum number of white LEDs the TPS61043DRBRG4 can drive in series?
The TPS61043DRBRG4 can drive up to four white LEDs in series when using the integrated overvoltage protection (OVP) function, which limits output to 17–19 V. With OVP disabled (OVP pin grounded), the device supports outputs up to 28 V - sufficient for longer LED strings - though external protection becomes necessary. The actual count depends on forward voltage per LED and input voltage; typical white LEDs (3.0–3.6 V VF) align with the 4-LED limit under OVP.
How does the TPS61043DRBRG4 regulate LED current without a current-sense amplifier?
The TPS61043DRBRG4 regulates LED current by using its FB pin to monitor the voltage across an external sense resistor (RS). The internal error amplifier maintains 252 mV (typ) across RS, so LED current equals 252 mV / RS. This method eliminates the need for a dedicated current-sense amplifier while achieving ±3% accuracy over temperature and line - a core design feature of the TPS61043DRBRG4 architecture.
Can the TPS61043DRBRG4 operate with input voltages below 2.0 V?
Yes, the TPS61043DRBRG4 supports input voltages as low as 1.8 V, making it compatible with deeply discharged single-cell Li-ion, NiMH, or alkaline batteries. Its undervoltage lockout (UVLO) threshold is 1.5 V (typ), ensuring reliable startup and regulation down to the specified 1.8 V minimum - a key capability confirmed in the TPS61043DRBRG4 recommended operating conditions table.
What is the purpose of the exposed thermal pad on the TPS61043DRBRG4 DRB package?
The exposed thermal pad on the TPS61043DRBRG4's 3 mm × 3 mm VSON (DRB) package is electrically and thermally connected to GND. It must be soldered to a PCB copper pour tied to the system ground plane to achieve the specified RθJA of 48.6 °C/W. This thermal path is essential for dissipating heat during continuous 400 mA switching and maintaining junction temperature within the –40°C to +125°C operating range of the TPS61043DRBRG4.
Does the TPS61043DRBRG4 support analog brightness control in addition to PWM?
Yes, the TPS61043DRBRG4 supports both PWM and analog brightness control. While PWM is applied directly to the CTRL pin (100 Hz–50 kHz), analog control is implemented externally using a resistive divider network (R1/R2) between an adjustable voltage (VADJ) and the FB pin - allowing linear LED current adjustment without PWM-induced EMI. This dual-mode capability is documented in the TPS61043DRBRG4 application information section.
TPS61043DRBRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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)
TPS61043DRBRG4 FAQ
1.How can I place an order for TPS61043DRBRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61043DRBRG4 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 TPS61043DRBRG4 reliable?
The price and inventory of TPS61043DRBRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61043DRBRG4 is usually 5 days.
3.What payment methods are accepted for TPS61043DRBRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61043DRBRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61043DRBRG4?
TPS61043DRBRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61043DRBRG4 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 TPS61043DRBRG4?
For technical support, including TPS61043DRBRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61043DRBRG4 requirements.
6.How does Aetrix verify that TPS61043DRBRG4 is sourced from the original manufacturer or authorized distributors?
All TPS61043DRBRG4 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 TPS61043DRBRG4 meets industry standards.
7.What is the process for return or replacement of TPS61043DRBRG4?
All TPS61043DRBRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS61043DRBRG4, 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 TPS61043DRBRG4 part is unused and in its original packaging.
Return procedure for TPS61043DRBRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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