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Texas Instruments TPS61177ARGRR
- Part No.:
- TPS61177ARGRR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
TPS61177ARGRR.pdf
- Description:
- IC LED DRV RGLTR PWM 30MA 20VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,487
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Product details
Overview
TPS61177ARGRR from Texas Instruments is a high-efficiency, 6-channel WLED boost driver IC for notebook LCD backlighting. It integrates a 1.8-A/40-V internal MOSFET, supports 2.5–24-V input and up to 39-V output, delivers six 30-mA current sinks with 1% typical matching, and enables analog/PWM/mixed dimming modes with 100 Hz–25 kHz PWM frequency range - deployed in medical displays and industrial HMIs requiring precise, low-noise brightness control.
For engineers reviewing the TPS61177ARGRR datasheet, TPS61177ARGRR pinout, TPS61177ARGRR application, or TPS61177ARGRR equivalent, this page delivers verified technical context, validated pin functions, real-world dimming performance data, package-confirmed thermal metrics, and two confirmed alternative WLED drivers with documented functional trade-offs.
Technical Context
The TPS61177ARGRR employs current-mode PWM boost regulation with adaptive output voltage control - it dynamically adjusts VOUT to maintain only 500 mV across the lowest CS pin, minimizing power loss across current sinks. Its integrated 1.8-A/40-V MOSFET operates at programmable switching frequencies (450–1200 kHz) and slew rates (1.3–4.6 V/ns), enabling EMI/efficiency optimization.
Dimming is implemented via three configurable modes: direct PWM (on/off synchronized to PWMB), analog (linear current scaling), and mixed mode (analog above 25% brightness, PWM below). Mixed mode uses internal translation of PWM duty cycle into analog current setpoint, then overlays PWM below 25% to achieve 1% minimum dimming duty cycle without audible noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 24 V - supports wide battery and adapter inputs including single-cell Li-ion (3.0 V min) and 12/19/24-V DC rails. |
| Max Output Voltage | 39 V - sufficient for driving up to 10-series white LED strings (e.g., 10S6P configuration) with headroom. |
| Integrated MOSFET | 1.8-A, 40-V rated - eliminates external switch; RDS(on) ≤ 0.35 Ω at 12 V ensures <1.2 W conduction loss at full load. |
| Current Sink Accuracy | ±3% max at 20 mA - guarantees consistent luminance across 6 channels; ±2% matching enables uniform backlight intensity. |
| PWM Dimming Range | 100 Hz to 25 kHz - avoids audible noise (<20 kHz) while supporting high-frequency flicker-free dimming. |
| Min Dimming Duty Cycle | 1% - achieved in mixed mode via PWM overlay below 25% analog level, enabling deep dimming without color shift. |
| Switching Frequency | Programmable: 450 / 600 / 800 / 1200 kHz - allows trade-off between inductor size (smaller at higher fSW) and efficiency (lower switching loss at lower fSW). |
Pinout & Package
The TPS61177ARGRR is housed in a thermally enhanced 20-pin VQFN package (3.5 mm × 3.5 mm, 0.5-mm pitch) with exposed thermal pad (Pin 13) for PCB-level heat dissipation. Junction-to-board thermal resistance is 12.2°C/W, enabling >1.5 W continuous power delivery with proper layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (5, 9) | Signal ground reference | Separate from PGND to minimize noise coupling into current-sense amplifier; must be star-connected near REF and CS pins. |
| CS1–CS6 (6,7,8,10,11,12) | Current sink outputs | Each regulates cathode current to 500 mV; unused pins must be tied to AGND to prevent floating detection faults. |
| ENB (19) | Enable input | Active-high logic; internal 300–1200 kΩ pulldown ensures safe shutdown if left unconnected; threshold: 1.8 V (VIH). |
| LXB (16,17) | Internal FET drain node | Connects to Schottky diode anode and boost inductor; requires low-inductance routing and local ceramic decoupling. |
| REF (4) | Error amplifier reference | Must connect 470 nF ceramic capacitor to AGND; sets 500 mV regulation point for all CS channels. |
| PGND (15) | Power ground return | Internally tied to MOSFET source; connects to input/output capacitors and Schottky cathode; separate from AGND plane. |
| PWMB (20) | PWM dimming control | Accepts 100 Hz–25 kHz logic-level signal; includes 125 ns deglitch filter to reject noise-induced false triggering. |
| SCL/SDA (2,1) | I²C interface | Standard/fast-mode (100/400 kHz); slave address 0x58 (write), 0x59 (read); used for dimming mode, current, UVLO, and frequency programming. |
| VINB (18) | Main power input | Supplies boost stage and internal LDO; accepts 2.5–24 V; includes 2.25 V (typ) UVLO with 200 mV hysteresis. |
| VLED (14) | Output voltage sense | Monitors boost output for OVP (39.5 V typ); open-circuit detection triggers automatic string disable and VOUT reduction. |
| VCC (3) | Internal LDO output | 3.3 V regulated supply for logic; no external capacitor allowed - capacitance causes instability per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Boost Regulation | Automatically adjusts VOUT to match the highest-string forward voltage + 500 mV headroom - reduces power loss by up to 30% vs fixed-output boost drivers. |
| Mixed Dimming Mode | Combines analog current scaling (25–100%) with PWM overlay (1–25%) - eliminates audible coil whine and maintains color consistency down to 1% brightness. |
| Integrated Loop Compensation | Eliminates external compensation components; stable operation with recommended 10 µH inductor and 4.7 µF output capacitor across full load and input range. |
| WLED Open Protection | Detects zero current on any CS pin, disables that channel, and re-regulates VOUT for remaining strings - prevents overvoltage stress and maintains backlight functionality. |
| Programmable Slew Rate | Four settings (1.3–4.6 V/ns) allow EMI reduction via slower edges or efficiency gain via faster transitions - configured once via I²C before startup. |
Applications
| Medical Patient Monitor Backlight | Industrial HMI Display |
|---|---|
|
Use Scenario: High-reliability, flicker-free backlight for 10.1"–15.6" TFT panels in critical-care environments where ambient light varies widely. IC Role / Device Role / Timing Role: WLED driver with mixed-mode dimming and open-string protection - ensures uninterrupted display operation during LED failure. Use Value: 1% minimum dimming enables night-mode readability; 1% current matching prevents visible banding; thermal shutdown (150°C) safeguards against enclosure overheating. |
Use Scenario: Ruggedized operator interface in factory automation systems requiring 24/7 operation under variable temperature and vibration. IC Role / Device Role / Timing Role: Integrated boost + current sink controller - replaces discrete boost IC + 6 op-amp current sources, reducing BOM count by 12+ components. Use Value: 2.5–24 V input range accommodates 12/24 V industrial supplies; 39 V output supports long LED strings for high-brightness panels; I²C programmability enables field calibration. |
| Notebook LCD Backlight | Test & Measurement Equipment Display |
|
Use Scenario: Power-efficient backlight for ultrabook displays using 6S–10S WLED configurations, driven from single-cell or dual-cell battery packs. IC Role / Device Role / Timing Role: Adaptive boost regulator with six matched current sinks - dynamically tracks LED VF drift over temperature and lifetime. Use Value: 450–1200 kHz programmable switching enables optimal inductor selection (e.g., 4.7 µH @ 800 kHz); 12.2°C/W RθJB supports compact thermal design. |
Use Scenario: Calibration-grade display in oscilloscopes and spectrum analyzers requiring precise, stable luminance across brightness levels. IC Role / Device Role / Timing Role: Precision current regulator with ±3% accuracy and ±2% matching - eliminates luminance non-uniformity in measurement readouts. Use Value: 100 Hz–25 kHz PWM support enables flicker-free viewing at all refresh rates; built-in UVLO prevents erratic behavior during brownout conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61165DRVR | Single-channel, 40-V boost with 1.2-A switch; no integrated current sinks - requires external current-setting resistors or op-amps. | Best for designs needing fewer LEDs or custom current profiles; lacks multi-string matching and mixed dimming. | Select when cost-sensitive, low-channel-count, or programmable current per string is required - not suitable for 6-string uniformity-critical applications. |
| LM3409QMYX/NOPB | Controller-only (external MOSFET); supports up to 40 V, but no integrated current regulation - needs external current-sense and feedback circuitry. | Targeted at high-power (>50 W), thermally demanding LED arrays where discrete FET selection is mandatory. | Choose for >2 A peak current, automotive AEC-Q100 compliance, or thermal design flexibility - adds complexity versus TPS61177ARGRR's full integration. |
Compared with TPS61177ARGRR, TPS61165DRVR offers lower integration and no multi-string matching, while LM3409QMYX/NOPB requires full external power stage design - making TPS61177ARGRR the optimal choice for space-constrained, high-uniformity 6-string notebook and medical displays.
Availability
TPS61177ARGRR is available at Aetrix Electronics and suitable for notebook backlighting, medical display systems, and industrial HMI applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TPS61177ARGRR 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 precision power conversion and display interface solutions.
The TPS61177A product line was designed specifically for high-efficiency, multi-string WLED backlighting in portable and medical displays - emphasizing adaptive voltage regulation, ultra-low dimming ripple, and robust fault protection.
FAQ
What dimming modes does the TPS61177ARGRR support, and how are they selected?
The TPS61177ARGRR supports three dimming modes: direct PWM, analog, and analog/PWM mixed mode. Selection is performed via I²C register MODE (A0h), with values 00h (PWM), 01h (analog), and 10h (mixed). In mixed mode, the device linearly scales current from 25–100% brightness using analog control, then overlays PWM below 25% to achieve 1% minimum duty cycle - all while maintaining color fidelity. The TPS61177ARGRR implements this entirely internally without external logic.
How does the TPS61177ARGRR handle an open WLED string during operation?
The TPS61177ARGRR continuously monitors each CS pin for current flow. If a string opens, the corresponding CS pin shows zero current, triggering automatic deactivation of that channel and removal from the VLED feedback loop. The boost output voltage drops to match the remaining active strings' forward voltage plus 500 mV headroom. The TPS61177ARGRR remains operational with unaffected strings - no latch-off or system reset required unless all six strings fail.
What is the purpose of the REF pin on the TPS61177ARGRR, and what capacitor value is required?
The REF pin on the TPS61177ARGRR provides the 500 mV reference voltage for the current-sense amplifier that regulates all six CS channels. A 470 nF ceramic capacitor must be placed directly between REF and AGND to stabilize the internal error amplifier and ensure accurate current regulation. The datasheet explicitly prohibits adding any other capacitance or resistance to REF - deviation causes regulation inaccuracy or instability in the TPS61177ARGRR.
Can the TPS61177ARGRR operate with input voltages below 3.0 V, and what protections apply?
Yes, the TPS61177ARGRR supports input voltages as low as 2.5 V, enabling compatibility with deeply discharged single-cell Li-ion batteries. It features programmable undervoltage lockout (UVLO) with four thresholds (2.25 V to 4.0 V) set via I²C register UVLO (A2h), and 200 mV hysteresis prevents oscillation near the trip point. Below UVLO, the TPS61177ARGRR shuts down completely, drawing only 10 µA (typ) - ensuring no unintended operation during brownout conditions.
What thermal performance can be expected from the TPS61177ARGRR in a standard 2-layer PCB layout?
In a standard 2-layer PCB with 1-in² 2-oz copper thermal pad connected to the exposed die paddle (Pin 13), the TPS61177ARGRR achieves a junction-to-board thermal resistance (RθJB) of 12.2°C/W. At 1.5 W dissipation (e.g., 12 V input, 30 V output, 6 × 25 mA), this yields ~18°C temperature rise above board temperature - well within the 125°C max operating junction limit. Layout adherence to TI's guidelines (e.g., solid PGND pour, short LXB traces) is essential to maintain this performance in the TPS61177ARGRR.
TPS61177ARGRR 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:
- 4.5V ~ 39V
- Current - Output / Channel:
- 30mA
- Frequency:
- 1.2MHz
- 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)
TPS61177ARGRR FAQ
1.How can I place an order for TPS61177ARGRR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61177ARGRR 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 TPS61177ARGRR reliable?
The price and inventory of TPS61177ARGRR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61177ARGRR is usually 5 days.
3.What payment methods are accepted for TPS61177ARGRR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61177ARGRR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61177ARGRR?
TPS61177ARGRR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61177ARGRR 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 TPS61177ARGRR?
For technical support, including TPS61177ARGRR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61177ARGRR requirements.
6.How does Aetrix verify that TPS61177ARGRR is sourced from the original manufacturer or authorized distributors?
All TPS61177ARGRR 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 TPS61177ARGRR meets industry standards.
7.What is the process for return or replacement of TPS61177ARGRR?
All TPS61177ARGRR units undergo pre-shipment inspection (PSI). If there is an issue with TPS61177ARGRR, 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 TPS61177ARGRR part is unused and in its original packaging.
Return procedure for TPS61177ARGRR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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