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Texas Instruments TPS61181RTER
- Part No.:
- TPS61181RTER
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
TPS61181RTER.pdf
- Description:
- IC LED DRV RGLTR PWM 25MA 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,775
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Product details
Overview
TPS61181RTER from Texas Instruments is a highly integrated white LED (WLED) boost driver IC for notebook and media-form-factor LCD backlight systems. It integrates a 1.5 A/40 V power MOSFET, six precision current sinks (25 mA each), true shutdown, overvoltage protection, and auto-adaptive boost output regulation. It supports up to 10 WLEDs in series with ≤2.5% current matching and 1000:1 PWM dimming range - deployed in high-efficiency, low-noise notebook display backlight designs.
For engineers reviewing the TPS61181RTER datasheet, TPS61181RTER pinout, TPS61181RTER application, or TPS61181RTER equivalent, this page delivers verified technical context, validated pin functions, real-world application constraints (e.g., 1.0 MHz switching, 400 mV IFB regulation threshold), and confirmed alternative options for WLED backlight power management in portable computing displays.
Technical Context
The TPS61181RTER implements current-mode PWM control with fully integrated loop compensation, enabling stable regulation across 5–24 V input and up to 38 V output. Its boost converter dynamically adjusts VO to maintain only ~400 mV headroom above the lowest IFB voltage, minimizing power loss in the current sinks.
It features dual-protection architecture: pulse-by-pulse overcurrent limiting (1.5 A min) on the internal MOSFET, plus external PFET gate drive (Fault pin) for input-output isolation during short-circuit or overcurrent faults - ensuring battery disconnection and true shutdown with <18 µA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5 V to 24 V - supports wide-range battery inputs including 2-cell Li-ion (7.2–8.4 V) and 3-cell (10.8–12.6 V) configurations. |
| Switching Frequency | 1.0 MHz (typ) - enables compact external components (e.g., 4.7 µH inductor, 4.7 µF output cap) and reduces EMI in portable systems. |
| Integrated Power Switch | 1.5 A / 40 V N-channel MOSFET - eliminates need for external high-voltage switch; RDS(on) = 0.45 Ω (max) minimizes conduction loss. |
| Current Sink Accuracy | ±3% (20 mA typical) with ≤2.5% matching across six channels - ensures uniform brightness in multi-string WLED arrays. |
| IFB Regulation Threshold | 400 mV (min) - sets precise current sink reference; VO auto-adjusts to maintain this voltage at the lowest IFB node. |
| PWM Dimming Range | 100 Hz to 1 kHz frequency; 0.1% to 100% duty cycle - achieves 1000:1 brightness control without visible flicker or audible ceramic capacitor noise. |
| Protection Features | OVP (39 V typ), short-circuit detection (ΔV = 1.7–2.5 V), thermal shutdown (160 °C), and WLED open/short fault handling - enables robust operation in unattended backlight systems. |
Pinout & Package
TPS61181RTER is housed in a thermally enhanced 16-pin QFN package (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad (PGND-connected). The package supports high-power dissipation (RθJA = 48.7 °C/W on multilayer board) and requires standard reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 1) | Power ground reference | Internal connection to MOSFET source; must be low-impedance copper pour tied to thermal pad for thermal and EMI performance. |
| SW (Pin 2) | Switch node | Drain of internal MOSFET; connects to inductor and Schottky diode - high dv/dt node requiring tight layout and minimal trace length. |
| VBAT (Pin 3) | Battery input supply | Primary power input (5–24 V); supplies internal LDO (TPS61181/2) and provides reference for Fault pin pull-up and short-circuit detection. |
| VO (Pin 4) | Boost output monitor | Feedback node for auto-adaptive output regulation; connected to WLED string anodes - determines VO setpoint via lowest IFB voltage. |
| ISET (Pin 5) | Current programming input | Sets total WLED current via external resistor (e.g., 62 kΩ → 20 mA); IOUT = KISET × VISET/RISET, where KISET = 1000 (typ). |
| Cin (Pin 6) | IC supply output | 3.15 V (typ) regulated output from internal LDO; requires 0.1 µF bypass capacitor - not to be connected to EN or other noisy nodes. |
| IFB1–IFB6 (Pins 7–9, 12–14) | Current sink feedback inputs | Each monitors cathode voltage of one WLED string; IC regulates lowest IFB to 400 mV - unused pins grounded (TPS61181/2) for safe disable. |
| GND (Pin 10) | Signal ground | Analog/digital reference for internal circuitry; separate from PGND but tied at single point near thermal pad. |
| DCTRL (Pin 11) | PWM dimming input | Accepts logic-level PWM signal (0.1–1 kHz); directly controls ON/OFF state of all six current sinks with matched timing. |
| EN (Pin 15) | Enable control | Active-high logic input; enables internal LDO and full device operation - must not be tied to Cin to avoid startup failure. |
| Fault (Pin 16) | Fault gate driver output | Drives external PFET gate for input-output isolation; pulls low during normal operation; goes high during fault or startup to disconnect battery. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-adaptive boost output | VO dynamically tracks minimum IFB voltage (400 mV target), reducing power loss in current sinks by up to 15% vs fixed-output boost drivers. |
| True shutdown with PFET control | Fault pin drives external PFET to fully isolate battery during shutdown - leakage <1 µA, eliminating standby drain in always-on display systems. |
| Integrated loop compensation | Eliminates external compensation network; stable operation across full load, input, and output voltage ranges without tuning. |
| Low-audible-noise PWM dimming | Minimized output AC ripple across 0.1–100% duty cycle and 100 Hz–1 kHz frequency - prevents piezoelectric squeal from ceramic output capacitors. |
| WLED open/short fault tolerance | TPS61181 detects single-string open fault and continues regulating remaining strings; shuts down only if all six IFB pins report zero current. |
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 controller and adaptive boost regulator; manages PWM dimming timing, fault reporting, and thermal safety. Use Value: Enables >90% efficiency at 120 mA total output with <3% current mismatch - critical for uniform screen luminance and battery runtime extension. | Use Scenario: Powering compact 7″–10″ ultra-mobile PC displays under space-constrained PCB layouts. IC Role / Device Role / Timing Role: Integrated power + current regulation IC; replaces discrete boost + current mirror solutions, reducing BOM count by ≥7 parts. Use Value: 3×3 mm QFN footprint and 1.0 MHz switching allow <20 mm² solution size - ideal for thin, fanless UMPC form factors. |
| Media Tablet Backlight | Industrial Panel Display Backlight |
Use Scenario: High-brightness backlight for 8″–12″ media tablets operating across –20°C to 70°C ambient. IC Role / Device Role / Timing Role: Adaptive voltage regulator with thermal shutdown (160°C) and cold-start WLED warm-up support (OVP holdover). Use Value: Maintains regulated current even as WLED VF rises at low temperature - avoids brightness drop during cold boot. | Use Scenario: Reliable backlight for industrial HMIs and medical displays requiring long-term stability and fault logging. IC Role / Device Role / Timing Role: Fault-reporting WLED driver with isolated battery disconnect (Fault pin), OVP, and short-circuit recovery. Use Value: Fault pin status enables system-level diagnostics; true shutdown prevents battery drain during maintenance or idle states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61182RTER | 1.3 MHz switching frequency (vs. 1.0 MHz); identical pinout, package, and feature set. | Better EMI profile in noise-sensitive RF environments; slightly lower efficiency at light loads due to higher switching loss. | Select when system-level EMI compliance (e.g., CISPR-22 Class B) is prioritized over peak efficiency. |
| RT8532DGQW | Fixed 38 V output; no auto-adaptive VO; 1.2 MHz switching; 40 V/1.2 A MOSFET; no Fault pin or PFET drive. | Lacks input-output isolation and true shutdown; requires external circuitry for battery disconnect and fault reporting. | Choose for cost-sensitive, non-critical portable displays where isolation and ultra-low shutdown current are not required. |
Compared with TPS61181RTER, TPS61182RTER offers higher-frequency operation for tighter EMI control but trades off light-load efficiency, while RT8532DGQW reduces integration (no adaptive VO, no Fault-driven PFET) - making TPS61181RTER optimal for notebooks demanding reliability, efficiency, and battery isolation.
Availability
TPS61181RTER is available at Aetrix Electronics and suitable for notebook backlight design, UMPC display integration, and industrial panel display development requiring stable component supply, full production traceability, and long-term lifecycle support.
Supply support for TPS61181RTER 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 ICs - with decades of expertise in high-efficiency DC/DC conversion and display power solutions.
The TPS6118x family was engineered specifically for high-current, multi-string WLED backlighting in portable computing devices - emphasizing adaptive voltage regulation, low-noise dimming, and robust fault protection in ultra-compact packages.
FAQ
What is the maximum number of WLEDs the TPS61181RTER can drive in series?
The TPS61181RTER supports up to 10 white LEDs in series, assuming typical forward voltage of ~3.2 V per LED (32 V total), within its 38 V maximum output voltage rating. With proper thermal design and 4.7 µH inductor, it delivers up to 120 mA total current across six 25 mA current sinks - sufficient for full-brightness operation in 13–15″ notebook displays. Exceeding 10 LEDs risks violating the 15 V minimum VO regulation limit.
Does the TPS61181RTER require an external LDO or IC supply?
No - the TPS61181RTER integrates a linear regulator that generates its internal supply (3.15 V typical) from the VBAT pin when enabled. Pin 6 (Cin) is the LDO output and requires only a 0.1 µF bypass capacitor. Unlike the TPS61180, it does not need an external 3.3 V rail. Connecting Cin to EN or other nodes will prevent startup, as specified in the TI datasheet SLVS801E.
How does the TPS61181RTER handle a single open WLED string?
The TPS61181RTER detects zero current on the open IFB pin and automatically removes that channel from the VO regulation loop. It continues regulating the remaining active strings at their programmed current (e.g., five strings at 25 mA each), maintaining display functionality. This behavior differs from the TPS61180, which shuts down entirely upon detecting any open string - confirming TPS61181RTER's superior fault resilience in multi-string notebook backlights.
What is the purpose of the Fault pin on the TPS61181RTER?
On the TPS61181RTER, the Fault pin (Pin 16) serves two critical roles: (1) it drives the gate of an external PFET to physically disconnect the battery from the boost circuit during overcurrent, short-circuit, or thermal faults; and (2) it signals system-level fault status - pulled high during startup/fault, low during normal operation. This enables true shutdown with <1 µA battery leakage, a key requirement for notebook standby power budgets.
Can the TPS61181RTER achieve 1000:1 dimming with 1 kHz PWM frequency?
No - at 1 kHz PWM frequency, the TPS61181RTER supports a minimum duty cycle of ~1%, yielding only a 100:1 dimming range. The full 1000:1 range (0.1% duty cycle) is achievable only at 100 Hz. This trade-off is documented in the TI datasheet: higher dimming frequencies improve flicker immunity but reduce achievable depth due to internal timing constraints. For deep dimming, use 100–200 Hz; for flicker-free operation in video playback, 500–1000 Hz is recommended.
TPS61181RTER 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)
TPS61181RTER FAQ
1.How can I place an order for TPS61181RTER through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61181RTER 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 TPS61181RTER reliable?
The price and inventory of TPS61181RTER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61181RTER is usually 5 days.
3.What payment methods are accepted for TPS61181RTER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61181RTER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61181RTER?
TPS61181RTER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61181RTER 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 TPS61181RTER?
For technical support, including TPS61181RTER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61181RTER requirements.
6.How does Aetrix verify that TPS61181RTER is sourced from the original manufacturer or authorized distributors?
All TPS61181RTER 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 TPS61181RTER meets industry standards.
7.What is the process for return or replacement of TPS61181RTER?
All TPS61181RTER units undergo pre-shipment inspection (PSI). If there is an issue with TPS61181RTER, 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 TPS61181RTER part is unused and in its original packaging.
Return procedure for TPS61181RTER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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