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Texas Instruments TPS61181ARTET
- Part No.:
- TPS61181ARTET
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
TPS61181ARTET.pdf
- Description:
- IC LED DRV RGLTR PWM 30MA 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:338
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Product details
Overview
TPS61181ARTET from Texas Instruments is a white-LED driver IC for notebook LCD backlighting, integrating a 1.5-A/40-V boost regulator, six 30-mA current sinks, and adaptive output voltage control. It supports up to 10 series WLEDs at 120 mA total, operates from 4.5 V to 24 V input, delivers up to 38 V output, and features 1% typical current matching and 1000:1 PWM dimming.
For engineers reviewing the TPS61181ARTET datasheet, TPS61181ARTET pinout, TPS61181ARTET application, or TPS61181ARTET equivalent, key selection considerations include its integrated PFET driver for true shutdown, overvoltage/short-circuit/open-LED protection, minimal output ripple under PWM dimming, and WQFN-16 package with thermal performance optimized for space-constrained display power designs.
Technical Context
The TPS61181ARTET employs current-mode PWM control with integrated loop compensation and a fixed 1-MHz switching frequency to enable compact magnetics (4.7–10 µH) and low-output-capacitor solutions. Its adaptive boost regulation dynamically adjusts VO to maintain only 400 mV across the lowest IFB pin, minimizing power loss in current sinks.
It implements dual-stage fault response: pulse-by-pulse overcurrent limiting (1.5 A min) followed by isolation-FET shutdown during sustained short-circuit or open-WLED events. The internal LDO powers analog/logic circuits from VBAT, with Cin requiring a 0.1-µF bypass capacitor and strict isolation from EN or other noisy nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 24 V - supports wide battery input including 2-cell Li-ion (8.4 V) and 3-cell (12.6 V) configurations without external pre-regulation. |
| Max Output Voltage | 38 V - sufficient for driving up to 10 white LEDs in series (typical VF ≈ 3.2–3.5 V each) with margin for temperature drift and aging. |
| Switch FET Rating | 1.5-A/40-V integrated N-channel MOSFET - eliminates need for external high-voltage switch; RDS(on) ≤ 0.45 Ω ensures low conduction loss. |
| Current Sink Accuracy | ±1% typical matching, ±2.5% max mismatch - enables uniform brightness across 6 independent LED strings without per-channel calibration. |
| PWM Dimming Range | 1000:1 (0.1% to 100% duty @ 100 Hz) - supports high-contrast display dimming while maintaining linearity and minimizing audible ceramic capacitor noise. |
| Protection Features | Overvoltage (39 V typ), short-circuit (1.7 V ΔV detection), open-LED detection, thermal shutdown (160 °C), and true shutdown - enables robust system-level fault containment without external supervision. |
| Package | WQFN-16 (3.0 mm × 3.0 mm, 0.5-mm pitch) - thermally enhanced exposed pad supports 14.6 °C/W junction-to-board resistance for sustained 120-mA LED current. |
Pinout & Package
TPS61181ARTET is housed in a 16-pin WQFN package (3.0 mm × 3.0 mm, 0.5-mm pitch) with an exposed thermal pad. The package supports reflow soldering and provides low thermal resistance (RθJB = 14.6 °C/W) for continuous operation in notebook backlight applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND | Power ground | Internal connection to MOSFET source; must be tied to low-impedance PCB ground plane adjacent to SW and inductor to minimize switching noise. |
| SW | Switch node | Drain of internal MOSFET; connects to external Schottky diode cathode and inductor; requires tight layout to reduce EMI and ringing. |
| VBAT | Battery input | Main power input (4.5–24 V); supplies internal LDO and serves as reference for Fault pull-up and short-circuit detection. |
| VO | Boost output monitor | Feedback point for adaptive output regulation; connected directly to anode of LED string(s); not a power output pin. |
| ISET | Current programming | Resistor-connected pin setting total LED current via KISET × VISET; 1.229 V reference enables precise 20-mA/channel configuration. |
| Cin | LDO output | 3.15-V regulated supply for internal circuitry; requires dedicated 0.1-µF ceramic bypass capacitor; must not connect to EN or other signals. |
| IFB1–IFB6 | Current sink feedback | Cathode inputs for 6 independent LED strings; device regulates lowest IFB to 400 mV; unused pins may be left open or grounded. |
| GND | Signal ground | Analog/digital reference for EN, DCTRL, ISET, and fault reporting; separate from PGND but tied at single point near Cin capacitor. |
| DCTRL | PWM dimming input | Logic-level control (0.8–2 V thresholds) accepting 100 Hz–1 kHz PWM signal; replicates duty cycle on all IFB currents with minimal AC ripple. |
| EN | Enable input | Active-high logic control (2 V min); enables internal LDO and initiates soft-start; pulling low reduces quiescent current to ≤18 µA. |
| Fault | PFET gate driver | Open-drain output driving external PFET gate; pulls low to connect VBAT to boost input during normal operation; high during fault or startup. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Boost Regulation | Maintains only 400 mV headroom across lowest IFB pin, reducing power dissipation in current sinks and improving efficiency at high LED counts. |
| Integrated PFET Driver | Enables true shutdown by disconnecting battery from boost input during fault or EN=low, eliminating standby leakage and supporting system-level safety isolation. |
| Minimized PWM Ripple | Optimized internal timing and control loop suppresses output capacitor AC ripple across full 0.1–100% dimming range, preventing visible flicker and audible capacitor squeal. |
| Comprehensive Fault Protection | Detects and responds to overvoltage (39 V), short-circuit (ΔV ≥ 1.7 V), open-LED (zero IFB current), and thermal overload (160 °C) with automatic recovery or latch-off as appropriate. |
| Single-Supply Operation | Internal LDO powered from VBAT eliminates need for external bias rail; Cin pin provides clean 3.15-V supply for analog core, simplifying BOM and layout. |
Applications
| Notebook LCD Backlight | UMPC Display Backlight |
|---|---|
|
Use Scenario: Driving 10-series white LEDs in a 13.3-inch notebook panel with 120 mA total current and 250 cd/m² brightness. IC Role / Device Role / Timing Role: Primary LED current controller and adaptive boost regulator; manages PWM dimming synchronization, current matching, and fault isolation. Use Value: Enables uniform brightness, flicker-free dimming down to 0.1%, and >90% efficiency at 19-V input while occupying <25 mm² PCB area. |
Use Scenario: Powering dual 6-string WLED arrays in a 7-inch UMPC with variable ambient light sensing and dynamic contrast adjustment. IC Role / Device Role / Timing Role: Dual-string current sink manager with independent IFB feedback and shared boost stage; supports fast PWM dimming transitions (<10 µs rise/fall). Use Value: Delivers 1% current matching between strings for consistent color gamut and eliminates need for per-string DACs or op-amps. |
| Media Tablet Backlight | Industrial Panel PC Backlight |
|
Use Scenario: Backlighting a 10.1-inch media tablet display operating from 8.4-V Li-ion battery with thermal derating above 60°C ambient. IC Role / Device Role / Timing Role: High-efficiency LED driver with integrated thermal shutdown and adaptive output voltage scaling to maintain brightness across battery discharge. Use Value: Maintains constant luminance over 4.5–12.6 V input range using real-time VO adjustment, reducing brightness droop by >40% vs fixed-output boost drivers. |
Use Scenario: Reliable backlight solution for a fanless industrial panel PC deployed in factory environments with wide temperature (-40°C to +85°C) and ESD exposure. IC Role / Device Role / Timing Role: Fault-tolerant LED controller with open/short-WLED detection, overvoltage clamping, and latch-off behavior during sustained overcurrent. Use Value: Prevents catastrophic failure during LED string degradation; enables predictive maintenance via Fault pin status reporting to host MCU. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white-LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61180RTET | Lower per-channel current (25 mA vs 30 mA); identical pinout, package, and feature set otherwise. | Supports max 150 mA total (6 × 25 mA) vs 180 mA (6 × 30 mA); less headroom for high-brightness or aging LED strings. | Select TPS61180RTET only if total LED current requirement is ≤150 mA and cost sensitivity outweighs margin for current drift. |
| LM3409QMHX/NOPB | External MOSFET controller (no integrated switch); requires external 40-V N-FET and separate current-sense amplifiers for multi-string operation. | Greater design flexibility but higher BOM count, larger footprint, and no integrated PWM dimming or IFB regulation loop. | Choose LM3409QMHX/NOPB when system requires >38-V output, >1.5-A peak current, or custom protection logic beyond TPS61181ARTET's integrated capabilities. |
Compared with TPS61181ARTET, TPS61180RTET offers identical integration and layout compatibility but reduced current capacity, while LM3409QMHX/NOPB trades integration for scalability and higher voltage/current headroom-making TPS61181ARTET optimal for compact, production-ready notebook backlight designs demanding precision, reliability, and minimal external components.
Availability
TPS61181ARTET is available at Aetrix Electronics and suitable for notebook LCD backlighting, UMPC display systems, and industrial panel PC illumination requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.
Supply support for TPS61181ARTET 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 leader specializing in analog, embedded processing, and power management technologies, with decades of leadership in LED driver innovation and display power solutions.
The TPS61181ARTET belongs to TI's high-precision white-LED driver product line, designed specifically for media-size LCD backlighting where compact size, current matching accuracy, and robust fault handling are critical in battery-powered portable devices.
FAQ
What is the maximum number of white LEDs the TPS61181ARTET can drive in series?
The TPS61181ARTET supports up to 10 white LEDs in series, based on its 38-V maximum output voltage and typical forward voltage of 3.2–3.5 V per LED at 20 mA. At cold temperatures or with high-VF binning, the practical limit may be 9 LEDs to maintain regulation margin. The device's adaptive VO control ensures minimum headroom across all operating conditions, and the datasheet confirms "up to 10 WLED in series, 120 mA total" in the typical application schematic. TPS61181ARTET achieves this using six parallel 30-mA current sinks, allowing flexible string configuration.
How does the TPS61181ARTET implement true shutdown functionality?
The TPS61181ARTET implements true shutdown by driving the Fault pin high during EN=low or fault conditions, which turns off an external PFET placed between VBAT and the boost inductor input. This physically isolates the battery from the LED string and boost circuit, reducing system standby current to ≤18 µA. Unlike conventional shutdown modes that leave input paths active, TPS61181ARTET's integrated PFET driver ensures zero DC leakage through the power path. This behavior is confirmed in the Functional Description section, which states the PFET is "turned off during device shutdown (thereby giving true shutdown) to prevent any leakage current from the battery."
What is the purpose of the ISET pin on the TPS61181ARTET, and how is LED current programmed?
The ISET pin on the TPS61181ARTET sets total LED current via an external resistor using the relationship IOUT = KISET × VISET/RISET, where KISET = 1000 (typical) and VISET = 1.229 V (typical). For example, a 62-kΩ resistor yields 20 mA per channel (120 mA total). The pin provides a precision 1.229-V reference with ±25-mV tolerance, enabling 1% typical current accuracy. This method eliminates need for external DACs or current-sense resistors, and the datasheet specifies ISET current as 20 µA in electrical characteristics. TPS61181ARTET uses this single resistor to program all six channels simultaneously while maintaining matching.
Does the TPS61181ARTET support analog dimming, or is it PWM-only?
The TPS61181ARTET supports PWM dimming only-not analog dimming. Brightness control is implemented exclusively via a logic-level PWM signal applied to the DCTRL pin, which directly modulates the current sink outputs with matched duty cycle and frequency (100 Hz to 1 kHz recommended). The datasheet explicitly states "The devices support pulse width modulation (PWM) brightness dimming" and provides no specifications, circuit examples, or functional description for analog (DC) dimming. Attempting analog control via ISET or other pins will not produce linear brightness adjustment and may violate operating conditions. TPS61181ARTET's architecture is optimized for low-ripple, high-ratio PWM dimming up to 1000:1.
What thermal performance can be expected from the TPS61181ARTET in a standard 2-layer PCB layout?
In a standard 2-layer PCB layout with 1-oz copper and the recommended thermal pad connection, the TPS61181ARTET achieves a junction-to-board thermal resistance (RθJB) of 14.6 °C/W, as specified in the Thermal Information table. At 120 mA total LED current and 19-V input, typical power dissipation is ~350 mW; this results in ~5.1°C junction-to-board temperature rise above board temperature. With ambient at 60°C and board temperature at 70°C, junction temperature remains well below the 125°C maximum operating limit. The WQFN-16 package's exposed thermal pad is essential-TI's layout guidelines require direct connection to a solid inner-plane or thermal via array for reliable operation. TPS61181ARTET's thermal shutdown triggers at 160°C with 15°C hysteresis.
TPS61181ARTET Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 24V
- Voltage - Output:
- 38V
- Current - Output / Channel:
- 30mA
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WQFN (3x3)
TPS61181ARTET FAQ
1.How can I place an order for TPS61181ARTET through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61181ARTET 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 TPS61181ARTET reliable?
The price and inventory of TPS61181ARTET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61181ARTET is usually 5 days.
3.What payment methods are accepted for TPS61181ARTET?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61181ARTET transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61181ARTET?
TPS61181ARTET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61181ARTET 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 TPS61181ARTET?
For technical support, including TPS61181ARTET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61181ARTET requirements.
6.How does Aetrix verify that TPS61181ARTET is sourced from the original manufacturer or authorized distributors?
All TPS61181ARTET 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 TPS61181ARTET meets industry standards.
7.What is the process for return or replacement of TPS61181ARTET?
All TPS61181ARTET units undergo pre-shipment inspection (PSI). If there is an issue with TPS61181ARTET, 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 TPS61181ARTET part is unused and in its original packaging.
Return procedure for TPS61181ARTET:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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