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Texas Instruments TPS61181RTET
- Part No.:
- TPS61181RTET
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
TPS61181RTET.pdf
- Description:
- IC LED DRV RGLTR PWM 25MA 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:430
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Product details
Overview
TPS61181RTET from Texas Instruments is a 1.0 MHz, 40 V/1.5 A integrated boost WLED driver with six 25 mA current sinks, built-in LDO for IC supply, and true shutdown capability. It delivers precise current matching (<2.5%) and supports up to 10-series WLED strings in notebook LCD backlight systems with 1000:1 PWM dimming range.
For engineers reviewing the TPS61181RTET datasheet, TPS61181RTET pinout, TPS61181RTET application, or TPS61181RTET equivalent, this page provides verified technical context, validated pin functions, confirmed WLED current regulation specs, and real-world design implications for media-form-factor display power management.
Technical Context
The TPS61181RTET integrates a current-mode PWM boost regulator with internal 1.5 A/40 V MOSFET and auto-adaptive output voltage control that regulates the lowest IFB pin to 400 mV-dynamically adjusting VO to match WLED forward voltage while maintaining efficiency. Its 1.0 MHz switching frequency enables compact passive component selection (4.7–10 µH inductor, 2.2–10 µF output capacitor).
It features six independent current sinks with ≤2.5% matching accuracy, PWM dimming control via DCTRL pin (100 Hz–1 kHz), and fault protection including over-voltage (39 V), short-circuit detection (1.7–2.5 V ΔVBAT–VO), and thermal shutdown (160 °C). The built-in LDO powers the IC from VBAT, eliminating need for external 3.3 V supply unlike TPS61180.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 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 pre-regulation. |
| Switching Frequency | 1.0 MHz - enables use of small 4.7 µH inductors and reduces EMI filtering requirements in space-constrained notebook designs. |
| Boost Output Voltage | Up to 38 V - sufficient for driving up to 10 white LEDs in series (VF ≈ 3.2–3.6 V each) while maintaining headroom for regulation. |
| WLED Current Accuracy | ±3% at 20 mA - achieved via 1.229 V ISET reference and 1000× current gain, ensuring consistent brightness across all six channels. |
| Current Matching | <2.5% (Km) - differential error between max/min channel current relative to average, critical for uniform backlight luminance. |
| PWM Dimming Range | 1000:1 at 100 Hz - enables deep dimming without visible flicker; duty cycle linearity maintained across full range per Figure 8–9. |
| Thermal Shutdown | 160 °C with 15 °C hysteresis - protects against sustained overload in sealed notebook chassis with limited airflow. |
Pinout & Package
TPS61181RTET is housed in a thermally enhanced 16-pin QFN package (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad (Pin 16 = Fault, not thermal pad; thermal pad is unmarked and must be soldered to PCB ground plane).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 1) | Power ground reference | Internally connected to source of internal PWM switch; must be low-impedance path to minimize switching noise coupling. |
| SW (Pin 2) | Switch node | Connects to drain of internal MOSFET, external Schottky diode anode, and inductor; high dv/dt node requiring tight layout. |
| VBAT (Pin 3) | Battery input & LDO input | Supplies boost stage and feeds internal LDO; under-voltage lockout triggers at 4.2 V (typ) to prevent brownout operation. |
| VO (Pin 4) | Boost output monitor | Connected to WLED string anodes; feedback loop senses minimum IFB voltage to auto-adjust VO for optimal efficiency. |
| ISET (Pin 5) | Current programming input | Resistor sets total WLED current (e.g., 62 kΩ → 20 mA per channel); voltage regulated at 1.229 V ±25 mV. |
| Cin (Pin 6) | LDO output & IC supply | Provides 3.15 V (typ) to analog/logic circuits; requires 0.1 µF ceramic bypass capacitor placed <1 mm from pin. |
| IFB1–IFB6 (Pins 7–9, 12–14) | Current sink feedback inputs | Each connects to cathode of one WLED string; IC regulates lowest IFB to 400 mV to maintain constant current. |
| GND (Pin 10) | Signal ground | Reference for logic-level pins (EN, DCTRL, Fault); must be separated from PGND until single-point star ground near IC. |
| DCTRL (Pin 11) | PWM dimming control | Accepts 100 Hz–1 kHz logic-level signal; rising/falling edges directly modulate WLED current without added latency. |
| EN (Pin 15) | Enable input | Logic high enables internal LDO and PWM controller; 32 ms low pulse initiates true shutdown (ISD < 18 µA). |
| Fault (Pin 16) | PFET gate driver & fault indicator | Drives external PFET between VBAT and inductor; pulls low during normal operation, high during fault or startup. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A/40 V MOSFET | Eliminates need for external high-side switch, reducing BOM count and PCB area in ultra-thin notebook backlight solutions. |
| Auto-adaptive boost output | VO dynamically tracks minimum WLED string VF, minimizing power loss across current sinks and improving system efficiency by up to 5% vs fixed-output drivers. |
| True shutdown with PFET control | Fault pin drives external PFET to disconnect battery during fault or shutdown, achieving <18 µA quiescent current and preventing battery drain. |
| Low-audible-noise PWM dimming | Optimized control loop minimizes output capacitor AC ripple across 100 Hz–1 kHz dimming range, suppressing ceramic capacitor piezoelectric squeal in quiet environments. |
| WLED open/short protection | Detects open strings (removes from feedback loop) or shorts (limits IFB voltage to 17 V) without full shutdown-maintaining partial backlight functionality in multi-string systems. |
Applications
| Notebook LCD Backlight | UMPC Display Backlight |
|---|---|
|
Use Scenario: Driving 6–10 white LEDs in series for 13.3″–15.6″ notebook displays with dynamic brightness control. IC Role / Device Role / Timing Role: Primary WLED current regulator and boost converter controller; manages PWM dimming timing via DCTRL pin with sub-millisecond response. Use Value: Delivers <2.5% current matching across all strings, enabling uniform luminance without software calibration, and supports 1000:1 dimming for HDR content rendering. |
Use Scenario: Powering compact 7″–10″ UMPC displays where board space and thermal envelope are severely constrained. IC Role / Device Role / Timing Role: Integrated power management IC combining boost conversion, current regulation, and fault isolation in single 3×3 mm QFN package. Use Value: Reduces solution size by >40% vs discrete boost + current sink designs; built-in soft-start prevents inrush current during cold boot in portable devices. |
| Media Form Factor LCD | Industrial Panel PC Backlight |
|
Use Scenario: Backlighting high-resolution tablets and convertible laptops requiring flicker-free dimming and robust fault handling. IC Role / Device Role / Timing Role: Adaptive voltage regulator that adjusts VO in real time to LED VF drift over temperature, maintaining stable current without closed-loop recalibration. Use Value: Achieves <3% current accuracy from –40°C to +85°C ambient, eliminating brightness shift during thermal cycling in consumer media devices. |
Use Scenario: Reliable backlight for industrial panel PCs operating in extended temperature ranges and subject to vibration/shock. IC Role / Device Role / Timing Role: Fault-tolerant WLED driver with over-voltage, short-circuit, and thermal protection-ensures continued operation even with partial LED failure. Use Value: Maintains partial backlight functionality during single-string open-circuit faults, improving system uptime in mission-critical HMI applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61182RTET | 1.3 MHz switching frequency (vs 1.0 MHz); identical pinout, package, and feature set except oscillator frequency. | Better EMI profile in noise-sensitive RF sections; slightly lower efficiency at light loads due to higher switching losses. | Select when system-level EMI testing fails at 1.0 MHz or when co-location with other 1.0 MHz converters causes beat-frequency interference. |
| LM3409QMHX/NOPB | External MOSFET controller (no integrated switch); requires external 40 V N-channel FET and separate current sense amplifier. | Higher design flexibility for >1.5 A output or custom thermal management; larger solution size and higher BOM cost. | Choose when output current exceeds 1.5 A or when discrete FET selection is required for ruggedized industrial environments. |
Compared with TPS61181RTET, TPS61182RTET offers EMI advantage without layout changes, while LM3409QMHX/NOPB trades integration for scalability-making TPS61181RTET optimal for space- and cost-constrained notebook backlight designs requiring plug-and-play reliability.
Availability
TPS61181RTET is available at Aetrix Electronics and suitable for notebook LCD backlight, UMPC display backlight, and media-form-factor LCD applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for volume production.
Supply support for TPS61181RTET 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 and embedded processing technologies, with decades of expertise in power management ICs for portable electronics.
The TPS6118x family was designed specifically for high-efficiency, low-noise WLED backlighting in thin-profile media devices-emphasizing integration, thermal resilience, and seamless PWM dimming performance.
FAQ
What is the maximum number of WLEDs the TPS61181RTET can drive in series?
The TPS61181RTET supports up to 10 white LEDs in series, based on its 38 V maximum output voltage rating and typical WLED forward voltage of 3.2–3.6 V per diode. At 3.6 V per LED, 10-series yields 36 V, leaving 2 V headroom for regulation margin and thermal VF drift. Driving more than 10 LEDs risks violating the VO overvoltage threshold or falling below minimum duty cycle limits.
Does the TPS61181RTET require an external 3.3 V supply?
No, the TPS61181RTET does not require an external 3.3 V supply. Unlike the TPS61180, it integrates an LDO linear regulator powered from VBAT, delivering a regulated ~3.15 V output at Pin 6 (Cin) to power internal circuitry. An external 0.1 µF ceramic capacitor is mandatory at Cin for LDO stability.
How does the TPS61181RTET handle WLED string failures?
The TPS61181RTET detects open WLED strings by monitoring IFB pin voltage and removes the affected string from the feedback loop-maintaining regulation on remaining strings. For shorted strings, it limits IFB voltage to 17 V and disables that channel. Full shutdown occurs only if all six strings fail open or severe overvoltage (>39 V) persists after regulation attempts.
What is the purpose of the Fault pin on the TPS61181RTET?
On the TPS61181RTET, the Fault pin (Pin 16) serves dual roles: it drives the gate of an external PFET to isolate the battery during faults or shutdown (true shutdown), and outputs a logic-high signal during startup or fault conditions for system-level reporting. During normal operation, it pulls low to enable the PFET and connect VBAT to the boost circuit.
Can the TPS61181RTET operate with input voltage below 5 V?
No, the TPS61181RTET cannot operate with input voltage below 5 V. Its VBAT under-voltage lockout triggers at 4.2 V (typical), disabling the device to prevent unstable regulation. Operation is guaranteed only within the specified 5 V to 24 V input range, making it unsuitable for single-cell Li-ion (nominal 3.7 V) or USB-powered (5 V nominal but droops under load) applications without upstream boosting.
TPS61181RTET 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):
- 5V
- Voltage - Supply (Max):
- 24V
- Voltage - Output:
- 38V
- Current - Output / Channel:
- 25mA
- 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)
TPS61181RTET FAQ
1.How can I place an order for TPS61181RTET through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61181RTET 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 TPS61181RTET reliable?
The price and inventory of TPS61181RTET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61181RTET is usually 5 days.
3.What payment methods are accepted for TPS61181RTET?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61181RTET transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61181RTET?
TPS61181RTET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61181RTET 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 TPS61181RTET?
For technical support, including TPS61181RTET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61181RTET requirements.
6.How does Aetrix verify that TPS61181RTET is sourced from the original manufacturer or authorized distributors?
All TPS61181RTET 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 TPS61181RTET meets industry standards.
7.What is the process for return or replacement of TPS61181RTET?
All TPS61181RTET units undergo pre-shipment inspection (PSI). If there is an issue with TPS61181RTET, 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 TPS61181RTET part is unused and in its original packaging.
Return procedure for TPS61181RTET:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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