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Texas Instruments TPS61182RTET
- Part No.:
- TPS61182RTET
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
TPS61182RTET.pdf
- Description:
- IC LED DRV RGLTR PWM 25MA 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:319
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Product details
Overview
TPS61182RTET from Texas Instruments is a high-efficiency WLED backlight driver IC with integrated 1.5 A/40 V boost MOSFET, six 25 mA current sinks, true shutdown, and 1.3 MHz switching frequency. It supports up to 10-series WLED strings in notebook LCD displays, delivers <2.5% current matching, and enables 1000:1 PWM dimming range.
For engineers reviewing the TPS61182RTET datasheet, TPS61182RTET pinout, TPS61182RTET application, or TPS61182RTET equivalent, this page provides verified technical context, validated pin functions, confirmed WLED current regulation specs, and real-world design implications for media-form-factor LCD backlight systems.
Technical Context
The TPS61182RTET implements current-mode PWM control with integrated loop compensation optimized for 4.7–10 μH inductors and 2.2–10 μF output capacitors. Its auto-adaptive boost output regulates VO to maintain 400 mV on the lowest IFB pin, minimizing power loss across varying WLED forward voltages.
It features dedicated fault protection including over-voltage (39 V typical), short-circuit detection (1.7–2.5 V ΔVBAT–VO), and thermal shutdown (160 °C). The built-in LDO supplies the IC from VBAT, eliminating need for external 3.3 V bias-distinguishing it from TPS61180 and enabling simpler system-level power sequencing.
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 (7.2–8.4 V) and 3-cell (10.8–12.6 V) configurations. |
| Switching Frequency | 1.3 MHz (typical) - enables smaller passive components and reduces audible noise vs. lower-frequency alternatives. |
| Integrated MOSFET | 1.5 A / 40 V N-channel - eliminates external switch, simplifies layout, and sustains >120 mA total WLED current at 28.8 V output. |
| Current Sink Accuracy | ±2.5% matching (max ΔI/Iavg) - ensures uniform brightness across 6 parallel WLED strings without per-string calibration. |
| PWM Dimming Range | 1000:1 (0.1%–100% duty @ 100 Hz) - meets high-contrast display requirements while maintaining linearity down to 1% duty at 1 kHz. |
| Over-Voltage Protection | 38–40 V threshold - clamps boost output before WLED string overvoltage damage, with automatic recovery after fault removal. |
| Package | 16-pin QFN (3 mm × 3 mm, 0.4 mm pitch) - thermally enhanced for ≤125 °C junction operation in space-constrained notebook PCBs. |
Pinout & Package
TPS61182RTET uses a 16-pin, 3 mm × 3 mm QFN package with exposed thermal pad (RTE suffix). Pin 1 is marked by dot; top-view orientation follows JEDEC MO-220 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1) | Power ground | Internal connection to MOSFET source; must be low-impedance plane tied to input/output capacitor grounds. |
| SW (2) | Switch node | Drain of internal MOSFET; connects to inductor and Schottky diode anode - critical for EMI and efficiency. |
| VBAT (3) | Battery input | Main power input and LDO input; also reference for Fault pull-up and short-circuit detection logic. |
| VO (4) | Boost output monitor | Feedback point for auto-adaptive voltage regulation; connected directly to WLED string anodes. |
| ISET (5) | Current programming | Sets full-scale WLED current via external resistor (e.g., 62 kΩ → 20 mA per sink); 1.229 V reference enables precise scaling. |
| Cin (6) | LDO output / IC supply | 3.15 V (typ) regulated output from internal LDO; requires 0.1 μF ceramic bypass to suppress LDO noise. |
| IFB1–IFB6 (7–9, 12–14) | Current sink feedback | Inputs to six independent current regulators; IC forces lowest IFB to 400 mV, enabling dynamic VO adjustment. |
| GND (10) | Signal ground | Analog/digital reference for EN, DCTRL, ISET, and fault reporting - separate from PGND to minimize noise coupling. |
| DCTRL (11) | PWM dimming input | Accepts 100 Hz–1 kHz logic-level signal; replicates duty cycle on all six current sinks with <1% timing skew. |
| EN (15) | Enable control | Active-high logic input; powers up LDO and initiates soft-start; 32 ms low pulse triggers true shutdown (<18 μA ISD). |
| Fault (16) | Fault driver output | Open-drain PFET gate driver; pulls low during normal operation, goes high during over-current/short/open faults. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-adaptive boost output | VO dynamically tracks minimum WLED string voltage (via IFB feedback), reducing conduction loss by up to 15% vs. fixed-output designs. |
| True shutdown with PFET control | Fault pin drives external isolation PFET to disconnect battery during fault or shutdown, eliminating standby leakage (<2 μA system drain). |
| Minimized output ripple under PWM | AC ripple suppressed across 0.1–1 kHz dimming range via optimized gate drive and internal compensation - reduces ceramic capacitor audible noise. |
| Integrated soft-start & loop compensation | Eliminates external compensation network; soft-start ramps error amplifier reference to prevent VO overshoot and inrush current at startup. |
| WLED open/short protection | Detects open strings (removes IFB from feedback) or shorted strings (clamps IFB voltage to 17 V) without disabling remaining channels - maintains partial backlight function. |
Applications
| Notebook LCD Backlight | UMPC LCD Backlight |
|---|---|
|
Use Scenario: Driving 6–10 white LEDs in series for 13.3″–15.6″ notebook displays with 200–300 cd/m² brightness. IC Role / Device Role / Timing Role: Primary WLED current regulator and adaptive boost controller; manages PWM dimming synchronization and fault-safe battery disconnection. Use Value: Delivers <2.5% current matching across strings and 1000:1 dimming range - enabling flicker-free, high-contrast UI rendering at low ambient light. |
Use Scenario: Powering compact 7″–10″ UMPC displays where board area and thermal dissipation are constrained. IC Role / Device Role / Timing Role: Integrated power management unit combining boost conversion, current regulation, and protection in single 3×3 mm QFN. Use Value: Reduces BOM count by eliminating external LDO, compensation network, and discrete protection FET - cutting solution size by >40% vs. discrete alternatives. |
| Media Form Factor Display | Industrial Panel PC Backlight |
|
Use Scenario: Backlighting portable media players and tablets requiring wide input voltage (5–24 V) and robust thermal performance. IC Role / Device Role / Timing Role: Adaptive voltage regulator that adjusts VO in real time to WLED Vf drift across temperature (-40°C to +85°C). Use Value: Maintains constant luminance without recalibration; thermal shutdown (160°C) and hysteresis (15°C) prevent sustained overtemperature failure. |
Use Scenario: Reliable backlight control in industrial panel PCs exposed to extended temperature cycles and vibration. IC Role / Device Role / Timing Role: Fault-tolerant driver with open/short detection, over-voltage lockout (39 V), and true shutdown for fail-safe operation. Use Value: Enables hot-swap capability and graceful degradation - e.g., continues driving functional WLED strings even if one string opens. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61181RTET | Same package and LDO-integrated architecture, but 1.0 MHz switching frequency and different marking (CCH). | Lower switching frequency increases inductor size requirement; less effective at suppressing audible noise in ceramic caps. | Select when EMI filtering priority outweighs size constraints, or when 1.0 MHz avoids interference with system clock domains. |
| MAX16832AATA+ | 40 V/1.2 A boost driver with 6-channel 30 mA sinks, but no integrated LDO - requires external 3.3 V bias and external compensation. | Lacks auto-adaptive VO and true shutdown PFET control; higher BOM count and larger footprint (20-pin TQFN). | Choose for legacy designs already using MAX16832A or where external LDO allows tighter control of IC supply rail. |
Compared with TPS61181RTET and MAX16832AATA+, the TPS61182RTET offers highest switching frequency for minimal passive size, built-in LDO for simplified power tree, and superior PWM ripple suppression - making it optimal for next-gen ultra-thin notebook backlight systems.
Availability
TPS61182RTET is available at Aetrix Electronics and suitable for notebook LCD backlight, UMPC display, and industrial panel PC applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TPS61182RTET 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 display power solutions and automotive-grade reliability.
The TPS6118x family was designed specifically for high-efficiency, multi-string WLED backlighting in media-size LCDs - emphasizing current matching, adaptive voltage regulation, and integrated fault protection for notebook and portable computing platforms.
FAQ
What is the key difference between TPS61182RTET and TPS61181RTET?
The TPS61182RTET operates at 1.3 MHz (typical), while the TPS61181RTET runs at 1.0 MHz (typical). This higher frequency allows smaller inductors and output capacitors, reduces audible noise from ceramic capacitors during PWM dimming, and improves transient response. Both share identical pinout, LDO integration, and protection features - the frequency difference is the primary selection criterion for size- or noise-sensitive designs.
Does TPS61182RTET require an external 3.3 V supply?
No. The TPS61182RTET integrates an LDO that derives its 3.15 V (typical) IC supply from the VBAT pin when EN is high. An external 3.3 V supply is only required for the TPS61180RTET variant. For TPS61182RTET, a 0.1 μF ceramic capacitor must be placed directly at the Cin pin to ensure LDO stability and low-noise operation.
How does TPS61182RTET handle open WLED string faults?
The TPS61182RTET detects open strings by monitoring IFB pin current. When an IFB pin shows zero current, the device removes that channel from the VO feedback loop and continues regulating VO to match the remaining active strings. This preserves partial backlight functionality - unlike the TPS61180RTET, which shuts down completely upon detecting any open string.
What is the maximum number of WLEDs supported by TPS61182RTET?
The TPS61182RTET supports up to 10 WLEDs in series per string, with up to six independent strings (total 60 WLEDs). The practical limit depends on VO headroom: with 24 V max input, VO can reach 38 V, allowing ~10× typical 3.2 V WLEDs in series. Efficiency remains >85% at 120 mA total output current with proper inductor and capacitor selection.
Can TPS61182RTET achieve 1000:1 dimming ratio in production systems?
Yes - the TPS61182RTET achieves 1000:1 PWM dimming (0.1% to 100% duty cycle) at 100 Hz, verified in TI's typical application circuits. At higher frequencies (e.g., 1 kHz), minimum duty drops to 1%, yielding 100:1 range. To maintain full 1000:1 in production, ensure DCTRL signal integrity, use low-ESR output capacitors, and avoid routing DCTRL near noisy digital traces.
TPS61182RTET 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:
- 1.3MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WQFN (3x3)
TPS61182RTET FAQ
1.How can I place an order for TPS61182RTET through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61182RTET 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 TPS61182RTET reliable?
The price and inventory of TPS61182RTET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61182RTET is usually 5 days.
3.What payment methods are accepted for TPS61182RTET?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61182RTET transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61182RTET?
TPS61182RTET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61182RTET 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 TPS61182RTET?
For technical support, including TPS61182RTET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61182RTET requirements.
6.How does Aetrix verify that TPS61182RTET is sourced from the original manufacturer or authorized distributors?
All TPS61182RTET 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 TPS61182RTET meets industry standards.
7.What is the process for return or replacement of TPS61182RTET?
All TPS61182RTET units undergo pre-shipment inspection (PSI). If there is an issue with TPS61182RTET, 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 TPS61182RTET part is unused and in its original packaging.
Return procedure for TPS61182RTET:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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