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Texas Instruments TPS61185RGER
- Part No.:
- TPS61185RGER
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
TPS61185RGER.pdf
- Description:
- IC LED DRV RGLTR PWM 25MA 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,272
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Product details
Overview
TPS61185RGER 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 switching frequency (600 kHz–2 MHz) and dimming frequency (100 Hz–20 kHz). It supports up to 10 series-connected WLEDs per string and delivers up to 10 W total LED power.
For engineers reviewing the TPS61185RGER datasheet, TPS61185RGER pinout, TPS61185RGER application, or TPS61185RGER equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency behavior under PWM dimming, exact current matching specs (±1%), and real-world design meaning of adaptive output voltage regulation and dual-mode PWM control.
Technical Context
The TPS61185RGER uses current-mode PWM control with integrated loop compensation and automatically adjusts its boost output voltage to maintain only 400 mV headroom across the lowest IFB pin-minimizing power loss while supporting variable LED forward voltage stacks. Its dual PWM dimming architecture allows either direct synchronization to an external PWMIN signal (MODE = GND) or internal oscillator-based dimming (MODE open/high, FPWMO-resistor-programmed).
It integrates protection including overvoltage clamping (programmable via R3/R4), thermal shutdown (170°C), WLED open/short detection per channel, and fault reporting via FAULT pin with PFET gate drive capability. The device operates from 4.2 V to 24 V input and regulates output up to 38 V with built-in 2 A/40 V MOSFETs (SW1/SW2).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2 V to 24 V - supports wide battery range including Li-ion multi-cell and adapter inputs without external pre-regulation. |
| Boost Output Voltage | Up to 38 V - sufficient for ≥10-series WLED strings at typical forward voltages (3.0–3.6 V each). |
| Current Sink Accuracy | ±1% typical matching - ensures uniform brightness across multiple LED strings in large-panel displays. |
| Switching Frequency | 600 kHz to 2 MHz (FSW-pin resistor programmable) - enables trade-off between small L/C size (high fSW) and peak efficiency (low fSW). |
| PWM Dimming Modes | Direct (synchronized to PWMIN) or programmable (100 Hz–5 kHz via FPWMO) - supports flicker-free dimming down to 1% duty cycle with 5 µs minimum on-time. |
| Thermal Protection | 170°C junction shutdown - prevents damage during sustained overloads or poor PCB thermal design. |
| Package | 24-pin 4 mm × 4 mm QFN (RGE) - exposes thermal pad for efficient heat dissipation in space-constrained notebook designs. |
Pinout & Package
TPS61185RGER is housed in a thermally enhanced 24-pin QFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad (PGND2/PGND1 connected internally). Pin 1 is marked by a dot; pin numbering follows standard counter-clockwise layout from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (1) | Enable control input | Logic-high (>2.1 V) activates internal LDO and full operation; logic-low (<0.8 V) forces <10 µA shutdown current. |
| FSW (2) | Switching frequency programming | Resistor to GND sets boost frequency from 600 kHz to 2 MHz - determines inductor size and efficiency vs. EMI trade-offs. |
| FPWMO (3) | PWM dimming oscillator output | Drives external resistor to GND to set internal dimming frequency (100 Hz–5 kHz) when MODE is open/high. |
| GND (5) | Signal reference ground | Low-noise analog/digital return path - must be separated from PGND1/PGND2 to avoid switching noise coupling into regulation loop. |
| PWMIN (6) | External PWM dimming input | Accepts 100 Hz–20 kHz logic-level PWM signal; directly controls all current sinks' on/off timing in Direct mode (MODE = GND). |
| IFB1–IFB8 (7–10, 12–15) | Current sink feedback inputs | Connected to LED cathodes; IC regulates lowest IFB voltage to 400 mV - enables adaptive output voltage and string-to-string matching. |
| ISET (11) | Current reference programming | Resistor to GND sets full-scale LED current (e.g., 62 kΩ → 20 µA → 19.6 mA per sink); accuracy depends on 1.229 V internal reference. |
| OVP (16) | Overvoltage protection input | Resistor divider from VOUT sets clamp threshold (e.g., 1 MΩ/54.9 kΩ → 39.0 V OVP) - prevents SW pin overstress during open-string faults. |
| PGND1/PGND2 (17–18) | Power ground terminals | Internally tied to MOSFET sources - must connect to low-impedance PCB copper pour under thermal pad for thermal and EMI performance. |
| SW1/SW2 (19–20) | Boost switch drain outputs | Drive external Schottky diode and inductor - rated for 40 V max, 2 A continuous; requires careful layout to minimize ringing. |
| FAULT (21) | Fault status output / PFET gate driver | Open-drain output pulls low during OVP, thermal shutdown, or open-string detection; can drive external PFET for input isolation. |
| MODE (22) | Dimming mode select | GND = Direct PWM (sync to PWMIN); open/high = Programmable PWM (FPWMO-resistor controlled) - configures core dimming behavior. |
| VIN (23) | Main power input | Supplies internal LDO and boost circuitry; includes 4.0 V UVLO with 200 mV hysteresis - prevents brownout operation. |
| VDD (24) | Internal LDO output | 3.15 V nominal supply for logic/analog blocks; requires 1 µF ceramic capacitor to GND for stability and noise rejection. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Boost Output Regulation | Maintains only 400 mV headroom above lowest IFB pin - reduces power loss and heat generation versus fixed-output boost drivers. |
| Eight Precision Current Sinks | 25 mA max per channel with ±1% matching - eliminates need for external ballast resistors and ensures uniform panel brightness. |
| Dual PWM Dimming Architecture | Supports both direct synchronization (to system PWMIN) and programmable internal oscillator (via FPWMO) - simplifies system integration across display controller variants. |
| Integrated Open/Short LED Protection | Automatically disables faulty strings and maintains regulation on remaining channels - improves system reliability without firmware intervention. |
| Programmable Overvoltage Threshold | Configurable clamp and OVP thresholds via external R3/R4 divider - enables safe operation with varying LED string counts and forward voltages. |
| Driver for Input/Output Isolation PFET | FAULT pin drives external PFET gate to disconnect battery during fault - meets notebook safety requirements for input isolation. |
Applications
| Notebook LCD Backlight | Industrial Panel Display |
|---|---|
|
Use Scenario: Driving 8–10 series WLED strings in 13.3″–15.6″ notebook panels with dynamic brightness control. IC Role / Device Role / Timing Role: Primary WLED current regulator and adaptive boost controller; manages PWM dimming timing, fault response, and thermal safety. Use Value: Enables >90% peak efficiency at 200 mA total output while maintaining ±1% current matching across strings - critical for color consistency and reduced thermal load. |
Use Scenario: Backlighting ruggedized HMI displays operating from 12 V DC industrial supplies with extended temperature requirements. IC Role / Device Role / Timing Role: High-reliability LED driver with open-string detection and programmable OVP - ensures fail-safe operation in unattended environments. Use Value: Built-in thermal shutdown (170°C) and robust ESD immunity (2 kV MM, 5 kV HBM) allow deployment in harsh conditions without additional protection circuitry. |
| Medical Imaging Display | Automotive Infotainment |
|
Use Scenario: Powering high-brightness diagnostic monitor backlights requiring flicker-free dimming down to 0.1 cd/m² luminance levels. IC Role / Device Role / Timing Role: Precision current source with 1% matching and 200 mV ripple under PWM dimming - eliminates visible artifacts in grayscale imaging. Use Value: Programmable dimming frequency (100 Hz–5 kHz) avoids audible noise and camera rolling shutter interference in clinical settings. |
Use Scenario: Backlighting center-stack displays in vehicles with 9–16 V battery input and ASIL-B-compatible fault reporting. IC Role / Device Role / Timing Role: Fault-aware LED driver with FAULT pin signaling and PFET isolation capability - supports functional safety diagnostics. Use Value: Direct PWM mode synchronizes dimming to vehicle MCU's PWM clock - eliminates timing jitter and ensures deterministic brightness transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61183RGER | Lacks FPWMO pin and programmable dimming oscillator; supports only direct PWM mode (MODE = GND required); identical 8-channel, 25 mA sink architecture and 4.2–24 V input. | Suitable for systems with fixed PWM clock source but not for standalone dimming-frequency tuning. | Select TPS61183RGER when cost optimization is prioritized and external PWM timing is guaranteed stable and available. |
| LM3409QMYX/NOPB | External MOSFET controller (no integrated FET); supports higher output current (3 A) and wider input (4.5–42 V); no integrated current sinks or IFB regulation. | Requires external current-setting resistors and op-amps per string - increases BOM count and layout complexity. | Choose LM3409QMYX/NOPB for high-power automotive or industrial LED arrays where flexibility in FET selection and thermal management outweighs integration benefits. |
Compared with TPS61185RGER, TPS61183RGER offers identical current regulation and boost performance but removes programmable dimming frequency - reducing design flexibility but lowering cost. LM3409QMYX/NOPB trades integration for scalability, requiring external components but enabling >3 A output and 42 V input support.
Availability
TPS61185RGER is available at Aetrix Electronics and suitable for notebook backlighting, industrial HMI displays, medical imaging monitors, and automotive infotainment systems requiring stable component supply, precise LED current matching, and programmable PWM dimming control.
Supply support for TPS61185RGER 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 expertise in precision power conversion and LED lighting solutions.
The TPS61185RGER belongs to TI's WLED backlight driver product line, engineered specifically for high-efficiency, multi-string notebook and portable display applications requiring adaptive voltage regulation, tight current matching, and robust fault protection.
FAQ
What is the maximum number of white LEDs the TPS61185RGER can drive in series?
The TPS61185RGER 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 above the lowest IFB pin. This allows operation with typical WLED forward voltages of 3.0–3.6 V per diode while preserving efficiency and thermal margin. Total system capacity reaches 80 LEDs using all eight current sinks.
How does the TPS61185RGER achieve adaptive output voltage regulation?
The TPS61185RGER achieves adaptive output voltage regulation by continuously monitoring all eight IFB pins and regulating the boost output to maintain exactly 400 mV on the lowest-voltage IFB pin. This minimizes excess voltage drop across the current sinks, reducing power loss and heat generation. The IC dynamically adjusts VOUT as LED forward voltages change with temperature or aging - a key efficiency advantage over fixed-output boost drivers.
What is the purpose of the MODE pin on the TPS61185RGER?
The MODE pin on the TPS61185RGER selects between two PWM dimming architectures: when grounded, it enables Direct PWM mode (synchronizing all current sinks to the external PWMIN signal); when open or pulled high, it enables Frequency Programmable mode (using the FPWMO pin resistor to set internal dimming frequency from 100 Hz to 5 kHz). This dual-mode flexibility supports diverse display controller interfaces without hardware redesign.
Can unused IFB pins on the TPS61185RGER be left floating?
No - unused IFB pins on the TPS61185RGER must be either grounded or left open (not floating), as specified in the datasheet. Grounding an unused IFB pin triggers immediate deactivation after enable, preventing false open-string detection. Leaving it open causes the IC to detect zero current during startup and remove that channel from regulation. Floating IFB pins risk undefined behavior, inaccurate regulation, or startup failure due to noise coupling.
What protection features are integrated into the TPS61185RGER?
The TPS61185RGER integrates overvoltage protection (OVP) with user-programmable clamp and trip thresholds, thermal shutdown at 170°C, WLED open- and short-circuit detection per channel, under-voltage lockout on VIN (4.0 V threshold), and fault reporting via the open-drain FAULT pin. It also includes ESD protection (5 kV HBM, 2 kV MM) and supports external PFET isolation for battery disconnection during faults - meeting stringent notebook safety requirements.
TPS61185RGER 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)
TPS61185RGER FAQ
1.How can I place an order for TPS61185RGER through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61185RGER 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 TPS61185RGER reliable?
The price and inventory of TPS61185RGER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61185RGER is usually 5 days.
3.What payment methods are accepted for TPS61185RGER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61185RGER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61185RGER?
TPS61185RGER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61185RGER 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 TPS61185RGER?
For technical support, including TPS61185RGER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61185RGER requirements.
6.How does Aetrix verify that TPS61185RGER is sourced from the original manufacturer or authorized distributors?
All TPS61185RGER 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 TPS61185RGER meets industry standards.
7.What is the process for return or replacement of TPS61185RGER?
All TPS61185RGER units undergo pre-shipment inspection (PSI). If there is an issue with TPS61185RGER, 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 TPS61185RGER part is unused and in its original packaging.
Return procedure for TPS61185RGER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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