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Texas Instruments TPS923654DRRR
- Part No.:
- TPS923654DRRR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
TPS923654DRRR.pdf
- Description:
- 65-V, 4-A BOOST OR BUCK-BOOST LE
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS923654DRRR from Texas Instruments is a 65V, 4A non-synchronous boost/buck-boost LED driver with integrated 150mΩ low-side NMOS FET, supporting inductive fast dimming (IFD), constant-current/constant-voltage (CC/CV) operation, and 100kHz–2.2MHz programmable switching frequency. It delivers precise LED current regulation for high-brightness lighting systems requiring fast transient response and wide input range (4.5V–65V).
For engineers reviewing the TPS923654DRRR datasheet, TPS923654DRRR pinout, TPS923654DRRR application, or TPS923654DRRR equivalent, key selection criteria include its 6.5A cycle-by-cycle current limit, WSON-12 package thermal performance (RθJA = 47.4°C/W), hybrid dimming linearity up to 2,000:1 at 20kHz, and support for common-cathode LED arrays in machine vision and medical illumination.
Technical Context
The TPS923654DRRR implements adaptive off-time current mode control with smart sampling to enable inductive fast dimming (IFD), achieving high dimming accuracy without external analog multipliers or complex timing circuits. Its error amplifier output (COMP) interfaces with an external RC network to set loop bandwidth, while the FSET pin configures switching frequency via resistor selection (e.g., 59kΩ → 400kHz).
It supports four distinct dimming modes-PWM (150ns min pulse width), analog (256:1), hybrid (2,000:1 at 20kHz), and flexible dimming-each selected by static logic levels on ADIM/HD and EN/PWM pins at startup. The device integrates full protection: LED open/short, sense resistor fault, thermal foldback (configurable via TEMP pin), and cycle-by-cycle current limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 65V - supports wide-range industrial and automotive power rails without pre-regulation |
| Max Output Current | 4A - enables driving high-power LED strings (e.g., 12× 350mA LEDs) in boost configuration |
| Switching FET RDS(on) | 150mΩ typical - reduces conduction loss and thermal stress in high-current applications |
| Current Limit | 5.8A–7.6A (typ 6.5A) - provides robust overcurrent protection during short-circuit or startup transients |
| Dimming Resolution | 2,000:1 at 20kHz hybrid dimming - meets machine vision strobe requirements with minimal brightness quantization |
| Thermal Shutdown | 165°C with 15°C hysteresis - prevents permanent damage under sustained overload or poor heatsinking |
| Operating Junction Temp | –40°C to +125°C - qualified for industrial and outdoor lighting environments |
Pinout & Package
TPS923654DRRR uses a 12-pin WSON package (3.0mm × 3.0mm, 0.5mm pitch) with exposed thermal pad connected to PGND/AGND. This compact, thermally enhanced layout supports single-layer PCB designs and simplifies thermal management in space-constrained LED drivers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switching node | Connects internally to low-side NMOS drain; ties to inductor and Schottky diode anode in boost topology |
| CSP / CSN | Current sense differential inputs | Measure LED current via external sense resistor; threshold fixed at 200mV for full-scale regulation |
| EN/PWM | Enable / PWM dimming input | High = always-on; PWM signal = direct PWM dimming; rising edge initiates soft-start sequence |
| ADIM/HD | Analog dimming / hybrid dimming select | Pull low = hybrid dimming; PWM input = analog dimming; high = PWM-only mode |
| FAULT | Open-drain fault indicator | Pulls low on LED open/short, thermal shutdown, or current-limit fault; requires external pull-up |
| FSET | Frequency set input | Resistor-to-AGND sets switching frequency from 100kHz to 2.2MHz; determines EMI profile and efficiency trade-off |
| TEMP | Thermal foldback configuration | Resistor-to-AGND sets foldback curve slope; direct AGND connection disables foldback |
| COMP | Error amplifier output | Drives external compensation network (RC) to stabilize current regulation loop bandwidth |
| VIN | Main power input | Supplies internal LDO and power stage; UVLO triggers at ~3.0V with 0.2V hysteresis |
| VCC | Internal LDO output | 5.15V ±0.15V regulated supply for analog circuitry; requires 1μF capacitor to AGND |
| PGND / AGND | Power / analog ground | Internally tied at thermal pad; separate routing recommended for noise-sensitive analog sections |
| Thermal Pad | Ground & thermal interface | Must be soldered to PCB copper pour for thermal dissipation and electrical grounding |
Key Features
| Feature | Design Value |
|---|---|
| Inductive Fast Dimming (IFD) | Enables sub-microsecond LED current transitions without external analog multipliers or digital controllers |
| Hybrid Dimming (2,000:1 @ 20kHz) | Combines analog control above 12.5% duty cycle and PWM below it-eliminates flicker while preserving resolution |
| Configurable Thermal Foldback | Adjustable via TEMP pin resistor to reduce LED current before thermal shutdown, extending system uptime |
| Integrated 150mΩ Low-Side FET | Reduces BOM count and board area vs. discrete switch solutions; supports up to 4A continuous output |
| Common-Cathode LED Support | Simplifies wiring and connector design in multi-string architectures, lowering system cost and failure points |
| Full Protection Suite | Includes LED open/short, CSP/CSN resistor fault, cycle-by-cycle current limit, and thermal shutdown with fault reporting |
Applications
| Machine Vision Illumination | Medical Surgical Lighting |
|---|---|
Use Scenario: High-speed synchronized strobing for industrial camera inspection of moving parts. IC Role / Device Role / Timing Role: LED driver with 150ns PWM minimum pulse width and inductive fast dimming for microsecond-level light control. Use Value: Enables precise exposure timing without motion blur, supporting >10k fps imaging with consistent LED intensity across frames. |
Use Scenario: Adjustable-intensity surgical headlight requiring flicker-free, color-stable illumination during procedures. IC Role / Device Role / Timing Role: Constant-current LED controller with hybrid dimming and thermal foldback for stable brightness under variable load and ambient temperature. Use Value: Delivers 2,000:1 dimming range at 20kHz-eliminating perceptible flicker while maintaining CRI >90 across all brightness levels. |
| Fire Alarm Strobe | LCD Backlighting |
Use Scenario: High-luminance emergency strobes meeting UL 1971 visibility requirements in daylight. IC Role / Device Role / Timing Role: Boost-mode LED driver with 65V input capability and robust fault handling for 24V/48V DC power systems. Use Value: Sustains 4A peak current into high-Vf LED strings while detecting open-circuit faults and signaling via FAULT pin. |
Use Scenario: Adaptive backlight for industrial displays requiring CC/CV operation and dynamic brightness scaling. IC Role / Device Role / Timing Role: Dual-mode controller regulating LED current (CC) or voltage (CV) for TEC or battery charging auxiliary functions. Use Value: Eliminates need for separate CV charger IC; supports seamless transition between backlight dimming and auxiliary power delivery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS923654DMTR | VSON-14 package (4.5mm × 3.0mm); lower RθJA (39.1°C/W) but larger footprint | Better thermal performance in high-power, forced-air-cooled systems; less suitable for ultra-compact layouts | Select when board space allows and junction temperature margin is critical above 3W dissipation |
| TPS923655DRRR | Identical WSON-12 package and 6.5A current limit, but includes spread spectrum EMI reduction (±7%, 2kHz modulation) | Preferred for EMC-sensitive environments (e.g., medical devices); slightly reduced dimming fidelity at lowest brightness | Choose when CISPR-22/32 compliance is required and hybrid dimming ratio >2,000:1 is not mandatory |
Compared with TPS923654DRRR, TPS923654DMTR offers superior thermal resistance but occupies more PCB area, while TPS923655DRRR trades minor dimming linearity for measurable EMI reduction-making each optimal for distinct system-level priorities: thermal density, board size, or regulatory emissions.
Availability
TPS923654DRRR is available at Aetrix Electronics and suitable for machine vision illumination, medical surgical lighting, fire alarm strobes, and LCD backlighting requiring stable component supply, long-term manufacturability, and TI's extended product lifecycle support.
Supply support for TPS923654DRRR 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 and embedded processing technologies, with decades of expertise in power management and LED control ICs.
The TPS92365x family was designed specifically for high-performance, high-reliability LED lighting systems demanding wide input range, fast dimming, and integrated protection-targeting industrial, medical, and safety-critical illumination markets.
FAQ
What dimming modes does the TPS923654DRRR support, and how are they selected?
The TPS923654DRRR supports four dimming modes: PWM, analog, hybrid, and flexible dimming. Selection occurs at startup based on logic states applied to the ADIM/HD and EN/PWM pins. For example, pulling ADIM/HD low and applying a PWM signal to EN/PWM enables hybrid dimming. All configurations require stable logic levels for ≥1ms after VIN exits UVLO. The TPS923654DRRR datasheet Table 7-2 defines exact pin combinations and timing requirements for reliable mode entry.
What is the maximum LED string voltage the TPS923654DRRR can drive in boost configuration?
The TPS923654DRRR supports output voltages up to 63V per its recommended operating conditions, limited by the 65V absolute maximum rating on the SW pin. In boost mode, this allows driving LED strings with total forward voltage up to ~60V (accounting for diode drop and margin). The OVP pin enables programmable overvoltage protection using an external resistor divider to prevent damage during open-load or transient overvoltage events. The TPS923654DRRR maintains regulation stability across this range when paired with appropriate inductor and output capacitor values.
How does the thermal foldback function work on the TPS923654DRRR, and can it be disabled?
The TPS923654DRRR thermal foldback reduces LED current gradually as junction temperature rises, preventing abrupt thermal shutdown. It is configured via the TEMP pin: connecting a resistor to AGND sets the foldback slope, while directly shorting TEMP to AGND disables the feature entirely. The foldback threshold starts at 130°C (with RTEMP = 20kΩ) and is fully customizable. This behavior is documented in the TPS923654DRRR electrical characteristics table and functional description section 7.3.4, ensuring predictable derating under sustained thermal stress.
What is the purpose of the COMP pin on the TPS923654DRRR, and what external components are required?
COMP is the error amplifier output pin used to connect an external compensation network (typically a series RC or R-C-RC network) between COMP and AGND. This network sets the control loop bandwidth and phase margin for stable current regulation. The TPS923654DRRR datasheet recommends starting with a 1nF capacitor and adjusting based on measured step response. Incorrect compensation can cause oscillation or slow transient recovery. The TPS923654DRRR application section 8.4 provides layout guidelines to minimize noise coupling into this sensitive analog node.
Does the TPS923654DRRR support constant-voltage (CV) mode, and for what applications is it intended?
Yes, the TPS923654DRRR supports constant-voltage (CV) mode alongside constant-current (CC) operation, enabling dual-use functionality. CV mode is explicitly intended for battery charging, TEC (thermoelectric cooler) control, and LCD backlight biasing where precise voltage regulation is required. The device automatically transitions between CC and CV based on load conditions, with dedicated OVP and current-limit protections active in both modes. This capability is detailed in the TPS923654DRRR description section and Figure 8-2 typical application schematic.
TPS923654DRRR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 65V
- Voltage - Output:
- 0V ~ 63V
- Current - Output / Channel:
- 4A
- Frequency:
- 100kHz ~ 2.2MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight, Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-WSON (3x3)
TPS923654DRRR FAQ
1.How can I place an order for TPS923654DRRR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS923654DRRR 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 TPS923654DRRR reliable?
The price and inventory of TPS923654DRRR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS923654DRRR is usually 5 days.
3.What payment methods are accepted for TPS923654DRRR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS923654DRRR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS923654DRRR?
TPS923654DRRR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS923654DRRR 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 TPS923654DRRR?
For technical support, including TPS923654DRRR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS923654DRRR requirements.
6.How does Aetrix verify that TPS923654DRRR is sourced from the original manufacturer or authorized distributors?
All TPS923654DRRR 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 TPS923654DRRR meets industry standards.
7.What is the process for return or replacement of TPS923654DRRR?
All TPS923654DRRR units undergo pre-shipment inspection (PSI). If there is an issue with TPS923654DRRR, 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 TPS923654DRRR part is unused and in its original packaging.
Return procedure for TPS923654DRRR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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