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Texas Instruments TPS61185RGET
- Part No.:
- TPS61185RGET
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
TPS61185RGET.pdf
- Description:
- IC LED DRV RGLTR PWM 25MA 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:365
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Product details
Overview
TPS61185RGET from Texas Instruments is a high-efficiency white LED driver IC for notebook LCD backlighting, integrating an adaptive 2 A/40 V boost regulator, eight 25 mA current sinks, and PWM dimming control with programmable 600 kHz–2 MHz switching frequency and 100 Hz–20 kHz dimming range. It delivers up to 10 WLEDs in series with 1% current matching and supports input voltage from 4.2 V to 24 V.
For engineers reviewing the TPS61185RGET datasheet, TPS61185RGET pinout, TPS61185RGET application, or TPS61185RGET equivalent, this page provides verified technical context on adaptive boost regulation, dual-mode PWM dimming (direct vs. FPWMO-programmed), ISET-based current programming, OVP threshold configuration, and QFN-24 thermal performance - all critical for notebook backlight BOM validation and layout design.
Technical Context
The TPS61185RGET uses current-mode PWM control with integrated loop compensation and automatically adjusts its boost output voltage to maintain only 400 mV across the lowest IFB pin, minimizing power loss. Its dual PWM dimming architecture supports either direct synchronization to the external PWMIN signal (MODE = GND) or internal oscillator-based dimming (MODE open/high, FPWMO resistor-set).
Each of the eight current sinks operates with ±1% matching accuracy above 5 mA and is individually disableable via open or grounded IFB pins. The device integrates overvoltage protection with two-stage response (clamp + shutdown), thermal shutdown at 170°C, and built-in WLED open/short detection that isolates faulty strings without disrupting regulation on remaining channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2 V to 24 V - supports wide battery input including Li-ion stacks and 12 V rails. |
| Boost Output Voltage | Up to 38 V - sufficient for ≥10-series WLED strings at typical forward voltages. |
| Switching Frequency | 600 kHz to 2 MHz - set by resistor on FSW pin; enables trade-off between inductor size and efficiency. |
| PWM Dimming Frequency | 100 Hz to 20 kHz - selectable via MODE pin state and FPWMO or PWMIN signal. |
| Current Sink Accuracy | ±1% typical matching - ensures uniform brightness across multiple LED strings. |
| Thermal Shutdown Threshold | 170°C - protects against sustained overload or poor PCB thermal design. |
| OVP Clamp Threshold | Programmable via R3/R4 divider - sets fast-response voltage limit before fault shutdown. |
Pinout & Package
TPS61185RGET is housed in a thermally enhanced 4 mm × 4 mm, 24-pin QFN package (RGE) with exposed thermal pad. The package supports high-power dissipation in compact notebook backlight designs and requires controlled-impedance routing for SW1/SW2 and proper grounding of PGND1/PGND2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | Logic-high activates internal LDO and full operation; pull-down resistor ~800 kΩ. |
| FSW | Frequency programming input | Resistor to GND sets boost switching frequency from 600 kHz to 2 MHz. |
| FPWMO | Dimming frequency output | Drives external resistor to GND to set internal PWM dimming frequency (100 Hz–5 kHz) when MODE is open/high. |
| PWMIN | Direct dimming control input | Accepts external 100 Hz–20 kHz PWM signal; determines dimming duty cycle and frequency in direct mode. |
| ISET | Current reference output | Resistor to GND programs total LED current; 62 kΩ yields ~20 µA → 25 mA per sink. |
| IFB1–IFB8 | Current feedback inputs | Connected to LED cathodes; regulated to 400 mV; unused pins may be open or grounded. |
| MODE | Dimming mode select | GND = direct PWM sync; open/high = FPWMO-programmed internal oscillator dimming. |
| OVP | Overvoltage protection input | Resistor divider from VOUT sets clamp and shutdown thresholds (e.g., 37.5 V clamp, 39.0 V shutdown). |
| FAULT | Fault reporting output | Open-drain output pulls low during OVP, thermal shutdown, or open-string detection. |
| VIN / VDD | Power inputs | VIN supplies internal LDO; VDD is LDO output (2.7–3.6 V) requiring 1 µF bypass capacitor. |
| SW1 / SW2 | Power switch drains | Connect to boost inductor and Schottky diode; support 40 V max drain-source voltage. |
| PGND1 / PGND2 | Power ground terminals | Internally tied to MOSFET source; must be routed separately from AGND for noise isolation. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive boost output regulation | Maintains only 400 mV headroom across lowest IFB pin, maximizing efficiency across varying LED forward voltages. |
| Dual PWM dimming architecture | Supports both externally synchronized (MODE = GND) and internally programmed (MODE open/high) dimming - no firmware dependency. |
| Integrated 2 A/40 V MOSFET | Eliminates need for external high-voltage switch; reduces BOM count and layout area in space-constrained notebooks. |
| Eight precision current sinks | Each delivers up to 25 mA with ±1% matching; enables uniform brightness across multi-string WLED arrays. |
| WLED open/short protection | Automatically disables faulty strings while maintaining regulation on healthy channels - improves system robustness. |
| Programmable overvoltage protection | Two-stage OVP (clamp + shutdown) configurable via single resistor divider - simplifies safety compliance. |
Applications
| Notebook LCD Backlight | Industrial Panel Display |
|---|---|
Use Scenario: Driving 8–10 white LEDs in series per string across 4–8 parallel strings in a 15.6-inch notebook display. IC Role / Device Role / Timing Role: Primary WLED current controller and adaptive boost regulator; manages PWM dimming timing, current matching, and fault response. Use Value: Enables >90% peak efficiency at 200 mA total output while maintaining <1% current mismatch across strings under thermal drift. |
Use Scenario: Backlighting for 10.1-inch industrial HMI with extended temperature operation (−40°C to 85°C ambient). IC Role / Device Role / Timing Role: High-reliability LED driver with thermal shutdown and open-string detection for unattended operation. Use Value: Sustains stable current regulation across temperature extremes and isolates failed strings without system-level reset. |
| Medical Diagnostic Monitor | Automotive Infotainment Display |
Use Scenario: Brightness-critical backlight for 12.1-inch diagnostic monitor requiring flicker-free dimming down to 1% duty cycle. IC Role / Device Role / Timing Role: Precision current sink array with 200 mV ripple under PWM dimming and 5 µs minimum on-time control. Use Value: Delivers clinically acceptable dimming linearity and eliminates visible PWM artifacts at low brightness levels. |
Use Scenario: Compact display backlight in automotive infotainment unit with 12 V nominal supply and ESD immunity requirements. IC Role / Device Role / Timing Role: Robust LED driver with 2 kV HBM ESD rating, input UVLO (3.8–4.2 V), and fault reporting via FAULT pin. Use Value: Ensures reliable startup during cold cranking and provides diagnostic feedback for system-level fault logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61183RGET | Same 24-pin QFN package and pinout; lower 1.5 A/36 V MOSFET; fixed 1 MHz switching; no FPWMO dimming control. | Limited to ≤8 WLEDs in series; lacks programmable dimming frequency and adaptive output voltage tuning. | Choose for cost-sensitive, lower-power notebook designs where 1 MHz fixed frequency suffices and FPWMO flexibility is unnecessary. |
| LM3409QMHX/NOPB | External MOSFET controller (no integrated switch); supports higher output voltage (>40 V); requires external compensation. | Designed for automotive and industrial LED lighting; lacks integrated current sinks and IFB regulation architecture. | Choose when driving >10-series WLED strings or requiring >40 V output; accept added BOM complexity for greater voltage/headroom margin. |
Compared with TPS61185RGET, TPS61183RGET offers pin compatibility but sacrifices adaptive boost, FPWMO dimming, and current sink count; LM3409QMHX requires external current sensing and compensation, trading integration for scalability beyond 38 V output.
Availability
TPS61185RGET is available at Aetrix Electronics and suitable for notebook backlighting, industrial HMI displays, medical diagnostic monitors, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and validated thermal performance in 4 mm × 4 mm QFN packages.
Supply support for TPS61185RGET 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 power conversion and LED driver innovation.
The TPS61185RGET belongs to TI's high-efficiency WLED driver product line, designed specifically for space-constrained, battery-powered notebook and portable display applications demanding precision current regulation and adaptive voltage optimization.
FAQ
What is the maximum number of white LEDs the TPS61185RGET can drive in series?
The TPS61185RGET supports up to 10 white LEDs in series per string, enabled by its 38 V maximum boost output voltage and adaptive regulation that maintains only 400 mV headroom across the lowest IFB pin. This allows efficient operation even as LED forward voltages vary with temperature and aging. Each of the eight current sinks can be assigned to a separate string, enabling configurations such as 8 strings × 10 LEDs or 4 strings × 10 LEDs with redundancy. The TPS61185RGET datasheet confirms this capability under "Up to 10 WLED in Series" in the FEATURES section.
How does the MODE pin affect PWM dimming behavior in the TPS61185RGET?
The MODE pin on the TPS61185RGET selects between two distinct PWM dimming architectures: when MODE is grounded, the device operates in direct PWM dimming mode, synchronizing all eight current sinks to the external signal applied to PWMIN; when MODE is left open or pulled high, dimming is controlled by the internal oscillator whose frequency is set by the resistor on FPWMO (100 Hz–5 kHz). This dual-mode capability allows system designers to choose between host-processor-driven dimming or autonomous, jitter-free dimming without MCU intervention. The TPS61185RGET functional block diagram and DETAILED DESCRIPTION section confirm this behavior.
What is the purpose of the ISET pin on the TPS61185RGET, and how is it configured?
The ISET pin on the TPS61185RGET sets the reference current for all eight current sinks using an external resistor to GND. With a typical ISET pin voltage of 1.229 V and current multiple KISET = 980, a 62 kΩ resistor yields ~20 µA at ISET, resulting in 25 mA per sink (20 µA × 980). The relationship follows Equation 2 in the datasheet: IOUT = VISET × KISET / RISET. This configuration enables precise, resistor-programmed LED current without requiring DACs or digital interfaces. The TPS61185RGET Electrical Characteristics table lists VISET = 1.204–1.253 V and KISET = 980, validating this design method.
Can unused IFB pins on the TPS61185RGET be left floating, and what happens during startup?
Unused IFB pins on the TPS61185RGET may be left floating (open) or tied to GND - both are valid and supported configurations. If open, the device detects zero current during startup and ramps the boost output to the OVP threshold before disabling that channel; if grounded, it detects voltage below 0.6 V (VIFB_nouse) and immediately excludes the pin from regulation after enable. In either case, the remaining active IFB channels maintain full 400 mV regulation and current accuracy. This behavior is explicitly documented in the "IFB PIN UNUSED" section of the TPS61185RGET datasheet and confirmed in the PIN FUNCTIONS table.
What thermal metrics apply to the TPS61185RGET in its RGE package, and how do they impact PCB layout?
The TPS61185RGET in the 4 mm × 4 mm RGE package has a junction-to-board thermal resistance (qJB) of 7.4°C/W and junction-to-case (bottom) resistance (qJC(bottom)) of 1.7°C/W, indicating strong thermal coupling to the PCB via its exposed power pad. Effective layout requires soldering the thermal pad to a minimum 250 mm² copper pour with ≥4 thermal vias (0.3 mm diameter) to an inner ground plane. The datasheet's THERMAL INFORMATION table and JEDEC-standard simulation conditions confirm these values apply under natural convection on a high-K board, making thermal pad connectivity non-optional for sustained 2 A operation. Failure to implement this results in rapid junction temperature rise beyond the 125°C operating limit.
TPS61185RGET Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 8
- Voltage - Supply (Min):
- 4.2V
- Voltage - Supply (Max):
- 24V
- Voltage - Output:
- 38V
- Current - Output / Channel:
- 25mA
- Frequency:
- 600kHz ~ 2MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-VQFN (4x4)
TPS61185RGET FAQ
1.How can I place an order for TPS61185RGET through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61185RGET 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 TPS61185RGET reliable?
The price and inventory of TPS61185RGET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61185RGET is usually 5 days.
3.What payment methods are accepted for TPS61185RGET?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61185RGET transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61185RGET?
TPS61185RGET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61185RGET 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 TPS61185RGET?
For technical support, including TPS61185RGET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61185RGET requirements.
6.How does Aetrix verify that TPS61185RGET is sourced from the original manufacturer or authorized distributors?
All TPS61185RGET 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 TPS61185RGET meets industry standards.
7.What is the process for return or replacement of TPS61185RGET?
All TPS61185RGET units undergo pre-shipment inspection (PSI). If there is an issue with TPS61185RGET, 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 TPS61185RGET part is unused and in its original packaging.
Return procedure for TPS61185RGET:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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