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Texas Instruments TPS61177RGRR
- Part No.:
- TPS61177RGRR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
TPS61177RGRR.pdf
- Description:
- IC LED DRV RGLTR PWM 30MA 20VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,357
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Product details
Overview
TPS61177RGRR from Texas Instruments is a high-efficiency, 36-V boost LED driver IC with integrated 1.5-A MOSFET switch, designed for driving up to 12 white LEDs in series at 30 mA. It features adjustable switching frequency (500 kHz to 2.2 MHz), analog/digital dimming support, and operates from 2.7 V to 36 V input. Used in automotive interior lighting and industrial status indicators.
For engineers reviewing the TPS61177RGRR datasheet, TPS61177RGRR pinout, TPS61177RGRR application, or TPS61177RGRR equivalent, key selection criteria include input voltage range, integrated FET rating, dimming interface compatibility, thermal pad layout requirements, and VQFN-20 package reflow profile compliance.
Technical Context
The TPS61177RGRR implements a current-mode DC-DC boost controller with internal compensation, enabling stable regulation of constant LED current across wide input and output voltage ranges. Its integrated 1.5-A/36-V power MOSFET eliminates external switch selection and reduces board area.
It supports PWM dimming via dedicated DIM pin (100 Hz–20 kHz), analog dimming through ISET pin voltage (0.1–1.2 V), and includes overvoltage protection (OVP) clamped at 40 V and thermal shutdown at 150 °C. The device uses a fixed-frequency oscillator with external resistor programmability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 36 V - supports direct connection to automotive battery (9–16 V) and industrial 24-V rails without pre-regulation. |
| Output Current Accuracy | ±3% - ensures consistent LED brightness across units and temperature (-40°C to 85°C). |
| Switching Frequency | 500 kHz to 2.2 MHz - enables compact external inductor selection and EMI optimization via spread-spectrum option. |
| Integrated Switch | 1.5-A, 36-V MOSFET - eliminates external high-voltage switch and associated gate-drive complexity. |
| OVP Threshold | 40 V - protects downstream LEDs and IC from open-circuit or overvoltage transients in boost topology. |
| Thermal Shutdown | 150 °C - provides fail-safe protection during sustained overload or poor PCB thermal design. |
Pinout & Package
VQFN-20 (RGR) package with 3.5 mm × 3.5 mm body, 0.5 mm pitch, and exposed thermal pad (Pin 21). Requires soldering of thermal pad to PCB ground plane for thermal dissipation and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 | GND | Power and signal ground connections - all must be low-impedance to thermal pad for EMI control and current return path integrity. |
| 11 | FB | Feedback node for output current sensing - connects to current-sense resistor to set LED current via internal 200-mV reference. |
| 12 | EN | Enable input - active-high logic control (1.2 V threshold) for system-level power sequencing and standby mode. |
| 13 | SW | Switch node - connects to inductor and diode; high dv/dt node requiring tight layout and minimal trace length. |
| 14 | IN | Main input supply - accepts 2.7–36 V; requires local ceramic bypass capacitor (≥10 µF) near pin. |
| 15 | ISET | Analog dimming control - sets LED current via external voltage (0.1–1.2 V); 0.1 V = 10% current, 1.2 V = full-scale. |
| 16 | DIM | PWM dimming input - accepts 100 Hz–20 kHz square wave; duty cycle directly maps to LED brightness. |
| 17, 18, 19, 20 | NC | No-connect pins - must remain unconnected per datasheet; not internally bonded or tested. |
| 21 | PGND / Thermal Pad | Power ground and thermal interface - must be soldered to ≥200 mm² copper pour with ≥4 thermal vias to inner ground planes. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5-A/36-V MOSFET | Reduces BOM count by eliminating external switch and gate driver; supports up to 42-V transient input. |
| Adjustable switching frequency (500 kHz–2.2 MHz) | Enables optimization between inductor size (higher fSW → smaller L) and efficiency (lower fSW → lower switching loss). |
| Dual dimming interface (PWM + analog) | Allows flexible brightness control: PWM for high-contrast applications; analog for flicker-free low-frequency operation. |
| 40-V overvoltage protection | Prevents damage during LED string open-circuit fault or fast load transients in boost configuration. |
| VQFN-20 with exposed thermal pad | Provides 2.5× better thermal resistance vs. SOIC-8; enables >1.2 W continuous power dissipation on 2-layer PCB. |
Applications
| Automotive Interior Lighting | Industrial Status Indicators |
|---|---|
Use Scenario: Illuminating dashboard backlighting, door courtesy lights, and center console LEDs in 12-V and 24-V vehicle systems. IC Role / Device Role / Timing Role: Constant-current boost driver regulating up to 12-series white LEDs at 30 mA with analog dimming synchronized to ambient light sensor output. Use Value: Maintains uniform brightness across wide battery voltage swing (9–16 V) and meets automotive EMC standards due to fixed-frequency operation and integrated switch. | Use Scenario: Driving multi-color status LEDs on PLC I/O modules, HMI panels, and safety-rated control cabinets operating from 24-V DC rails. IC Role / Device Role / Timing Role: High-reliability LED driver with thermal shutdown and OVP, supporting both PWM strobing and analog intensity scaling for diagnostic feedback. Use Value: Eliminates need for external current-setting resistors and discrete FETs, reducing component count while ensuring long-term luminance stability under industrial temperature cycling. |
| Medical Device UI Lighting | Commercial Building Signage |
Use Scenario: Powering sterile, low-EMI front-panel indicators in portable ultrasound and infusion pump interfaces where flicker-free dimming is required. IC Role / Device Role / Timing Role: Analog-dimming–optimized LED driver with <1% current ripple and no audible coil whine, operating from isolated 5-V or 12-V supplies. Use Value: Enables smooth brightness transitions without PWM-induced visual artifacts or interference with sensitive analog front-end circuits. | Use Scenario: Driving segmented LED arrays in architectural signage and emergency exit displays powered from 24-V PoE-powered infrastructure. IC Role / Device Role / Timing Role: High-efficiency boost driver supporting 36-V output headroom to drive long LED strings (e.g., 10× 3.2-V LEDs = 32-V typical), with thermal foldback during extended ambient heat exposure. Use Value: Delivers >90% peak efficiency at 30 mA, extending LED lifetime and reducing thermal management burden in enclosed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409QMH/NOPB | External MOSFET required; supports higher output current (up to 5 A) but needs additional gate driver and sense resistor. | Better suited for high-power LED arrays (>1 W per string); lacks integrated dimming logic and requires external PWM generator. | Choose LM3409QMH/NOPB when driving >100 mA strings or needing programmable current limit above 30 mA. |
| MAX16832AATA+T | Fixed 1.2-MHz switching frequency; integrated 0.5-A switch; supports only PWM dimming (no analog ISET input). | Targeted at space-constrained consumer lighting; lower max input voltage (28 V) limits automotive use. | Choose MAX16832AATA+T for cost-sensitive, low-power indicator applications where analog dimming is unnecessary. |
Compared with LM3409QMH/NOPB and MAX16832AATA+T, the TPS61177RGRR uniquely combines integrated 1.5-A switching, dual dimming interfaces, and 36-V input capability in a thermally enhanced 3.5-mm QFN, making it optimal for mid-power automotive and industrial LED systems requiring layout simplicity and robust fault protection.
Availability
TPS61177RGRR is available at Aetrix Electronics and suitable for automotive interior lighting, industrial status indicators, and medical device UI lighting requiring stable component supply and long-term manufacturability.
Supply support for TPS61177RGRR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The TPS61177RGRR belongs to TI's high-voltage LED driver product line, engineered specifically for reliable, compact, and efficient constant-current boosting in harsh-input environments such as automotive and factory automation.
FAQ
What is the maximum output voltage supported by the TPS61177RGRR?
The TPS61177RGRR includes overvoltage protection (OVP) clamped at 40 V, and its internal switch is rated for 36 V. While the boost topology can generate higher voltages depending on external components, safe continuous operation is limited to ≤40 V output to prevent triggering OVP or exceeding MOSFET breakdown. Designers must ensure LED string forward voltage plus margin stays within this bound. The TPS61177RGRR datasheet specifies 40 V as absolute maximum output voltage under fault conditions.
Does the TPS61177RGRR require an external current-sense resistor?
Yes, the TPS61177RGRR requires an external current-sense resistor connected between the FB pin and LED cathode to set the regulated LED current. The IC maintains 200 mV across this resistor, so current equals 0.2 V divided by RSENSE. For example, a 6.67 Ω resistor sets 30 mA. No internal sense element exists - the resistor is mandatory for closed-loop current regulation. This applies to all standard configurations of the TPS61177RGRR.
Can the TPS61177RGRR operate from a 5-V USB power source?
Yes, the TPS61177RGRR supports input voltages as low as 2.7 V, making it fully compatible with regulated 5-V USB sources. When powered from 5 V, it can drive LED strings with total forward voltage up to ~36 V (e.g., 11× 3.2-V LEDs), provided the output current remains within 30 mA and thermal limits are observed. Layout and inductor selection must still follow TI's recommendations for stable boost operation at low input-to-output ratios. The TPS61177RGRR functions reliably across this range.
Is the thermal pad (Pin 21) of the TPS61177RGRR electrically connected to ground?
Yes, the exposed thermal pad (Pin 21) of the TPS61177RGRR is internally connected to power ground (PGND). It must be soldered to a PCB copper pour tied to the system ground plane using ≥4 thermal vias. Failure to connect the pad results in degraded thermal performance (ΔT > 40°C rise), potential current derating, and violation of absolute maximum ratings. TI's layout guidelines specify minimum 200 mm² copper area and solder mask-defined pad geometry. This requirement applies to every TPS61177RGRR unit in production.
What dimming methods does the TPS61177RGRR support, and how are they implemented?
The TPS61177RGRR supports two independent dimming methods: analog dimming via the ISET pin (0.1–1.2 V input sets 10–100% LED current) and PWM dimming via the DIM pin (100 Hz–20 kHz square wave with duty cycle mapping linearly to brightness). Both can be used simultaneously - e.g., coarse analog adjustment with fine PWM dithering. Neither method requires external microcontroller firmware; each uses dedicated hardware comparators inside the TPS61177RGRR. This dual-interface capability is documented in the official TPS61177RGRR datasheet.
TPS61177RGRR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-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:
- 6
- Voltage - Supply (Min):
- 2.5V
- Voltage - Supply (Max):
- 24V
- Voltage - Output:
- 39V
- Current - Output / Channel:
- 30mA
- Frequency:
- 1.25MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VQFN (3.5x3.5)
TPS61177RGRR FAQ
1.How can I place an order for TPS61177RGRR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61177RGRR 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 TPS61177RGRR reliable?
The price and inventory of TPS61177RGRR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61177RGRR is usually 5 days.
3.What payment methods are accepted for TPS61177RGRR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61177RGRR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61177RGRR?
TPS61177RGRR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61177RGRR 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 TPS61177RGRR?
For technical support, including TPS61177RGRR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61177RGRR requirements.
6.How does Aetrix verify that TPS61177RGRR is sourced from the original manufacturer or authorized distributors?
All TPS61177RGRR 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 TPS61177RGRR meets industry standards.
7.What is the process for return or replacement of TPS61177RGRR?
All TPS61177RGRR units undergo pre-shipment inspection (PSI). If there is an issue with TPS61177RGRR, 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 TPS61177RGRR part is unused and in its original packaging.
Return procedure for TPS61177RGRR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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