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Texas Instruments TPS923655HMDMTR
- Part No.:
- TPS923655HMDMTR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
TPS923655HMDMTR.pdf
- Description:
- 65-V, 4-A BOOST ORBUCK-BOOST LED
- Quantity:
- Payment:
- Shipping:
Inventory:2,970
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Product details
Overview
TPS923655HMDMTR from Texas Instruments is a 65V, 8.5A peak-current, non-synchronous boost/buck-boost LED driver with integrated low-side NMOS FET (150 mΩ), supporting inductive fast dimming (IFD), hybrid/flexible dimming up to 1,000,000:1 at 120 Hz, and CC/CV charging mode for LCD backlighting and battery charging applications.
For engineers reviewing the TPS923655HMDMTR datasheet, TPS923655HMDMTR pinout, TPS923655HMDMTR application, or TPS923655HMDMTR equivalent, key selection considerations include its –55°C to 125°C operating junction temperature range, spread spectrum EMI reduction, 150 ns minimum PWM pulse width support, VSON-14 package with 4.5 mm × 3.0 mm footprint, and configurable thermal foldback via external resistor on TEMP pin.
Technical Context
The TPS923655HMDMTR implements adaptive off-time current-mode control with smart sampling to enable inductive fast dimming (IFD), achieving high dimming accuracy across analog, PWM, hybrid, and flexible modes. Its error amplifier output (COMP) interfaces with an external RC network to set loop bandwidth, while the FSET pin configures switching frequency from 100 kHz to 2.2 MHz using a single resistor.
It integrates full protection including LED open/short, sense resistor fault detection, cycle-by-cycle current limiting, thermal shutdown at 165°C, and configurable thermal foldback starting at 130°C. The device supports common-cathode LED topology and single-layer PCB layout, with dual ground pins (PGND and AGND) for noise isolation between power and analog domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 63 V - Enables direct operation from 12 V, 24 V, 48 V industrial rails and automotive battery systems without pre-regulation. |
| Peak Switch Current Limit | 8.5 A typical - Supports high-power LED strings or fast-charging battery loads with margin above 4 A nominal output capability. |
| Switching FET RDS(on) | 150 mΩ - Minimizes conduction loss and thermal stress in high-current boost/buck-boost topologies. |
| Dimming Resolution | 1,000,000:1 at 120 Hz PWM - Enables ultra-low-brightness precision in medical imaging and machine vision strobes. |
| Thermal Operating Range | –55°C to 125°C junction - Qualified for extended-temperature industrial, transportation, and outdoor lighting environments. |
| Spread Spectrum | Enabled - Reduces EMI peak amplitude by ±7% around central frequency, easing compliance with CISPR-25 Class 5. |
| Minimum PWM Pulse Width | 150 ns - Allows precise timing control for high-frequency flash synchronization in camera modules and IP cameras. |
Pinout & Package
VSON-14 package (4.5 mm × 3.0 mm, 0.45 mm height), thermally enhanced with exposed thermal pad connected to PGND/AGND. Pinout optimized for single-layer PCB routing and minimal parasitic inductance in high-current paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switching node | Connects internally to low-side NMOS drain; routes high di/dt current to inductor and Schottky diode - requires short, wide copper pour. |
| CSP / CSN | Current sense differential inputs | Measure LED current via external sense resistor; 200 mV threshold enables accurate 1% current regulation over temperature. |
| EN/PWM | Enable / PWM input | Configures startup and dimming mode; accepts 150 ns pulses for direct PWM control or triggers POR sequence when held high. |
| ADIM/HD | Analog dimming / hybrid dimming select | Determines dimming architecture: high = PWM-only, low = hybrid, PWM signal = flexible dimming - sets internal reference scaling. |
| FSET | Frequency set | Resistor-to-AGND sets switching frequency (100 kHz–2.2 MHz); lower frequencies improve efficiency, higher frequencies reduce inductor size. |
| TEMP | Thermal foldback control | External resistor to AGND defines foldback curve slope; direct AGND connection disables foldback for fixed-current operation. |
| FAULT | Open-drain fault indicator | Pulls low on LED open/short, thermal shutdown, or FET fault; enables system-level fault logging without additional logic. |
| PGND / AGND | Power / analog ground | Separate ground pins minimize noise coupling; thermal pad ties to both for optimal heat dissipation and reference stability. |
Key Features
| Feature | Design Value |
|---|---|
| Inductive Fast Dimming (IFD) | Enables sub-microsecond current settling during dimming transitions, preserving LED spectral integrity in high-speed machine vision illumination. |
| Hybrid Dimming Architecture | Combines analog control (12.5–100% brightness) with PWM (0–12.5%) to achieve 1,000,000:1 ratio at 120 Hz without visible flicker or color shift. |
| CC/CV Charging Mode | Supports constant-current battery charging and constant-voltage TEC control using same IC - eliminates need for separate charger IC in space-constrained designs. |
| Configurable Thermal Foldback | Adjustable via single resistor on TEMP pin to trade off output current vs. junction temperature - critical for sealed outdoor luminaires with limited airflow. |
| Integrated Low-Side NMOS | 150 mΩ RDS(on) reduces BOM count and improves power density versus external-FET solutions - simplifies layout and lowers EMI radiation. |
Applications
| Medical Surgical Lighting | Machine Vision Strobes |
|---|---|
|
Use Scenario: High-CRI, flicker-free illumination for endoscopic and surgical headlight systems requiring stable color rendering under rapid intensity modulation. IC Role / Device Role / Timing Role: Constant-current LED driver with hybrid dimming enabling seamless 10,000:1 intensity control at 4 kHz without perceptible stepping or thermal drift. Use Value: Maintains <±1% current regulation across 0–100% dimming range, ensuring consistent tissue illumination and reducing surgeon eye fatigue during long procedures. |
Use Scenario: Synchronized flash illumination for high-speed industrial cameras capturing moving parts on production lines at >10 kFPS. IC Role / Device Role / Timing Role: Fast-switching boost driver delivering 8.5 A peak current with 150 ns minimum PWM pulse width for precise exposure timing alignment. Use Value: Eliminates motion blur by matching LED turn-on latency to camera shutter trigger with <200 ns jitter, enabling sub-pixel object localization. |
| LCD Backlighting | Battery Charging Systems |
|
Use Scenario: Dynamic local dimming backlight for commercial displays and laser TVs requiring independent zone control and high contrast ratios. IC Role / Device Role / Timing Role: CC/CV-capable driver operating in buck-boost mode to regulate LED current across varying panel voltage (e.g., 12–40 V) while maintaining constant voltage for bias circuits. Use Value: Achieves 2,000:1 dimming ratio at 20 kHz with no audible noise, meeting DisplayHDR 1000 requirements without external DC-DC converters. |
Use Scenario: Single-chip charging solution for 2S–4S Li-ion packs in portable medical devices and ruggedized test equipment. IC Role / Device Role / Timing Role: Dual-mode controller delivering constant-current charge up to 4 A, then transitioning to constant-voltage termination with ±0.5% voltage accuracy. Use Value: Reduces bill-of-materials by replacing discrete charger + LED driver with one IC, saving >25 mm² PCB area and simplifying thermal management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS923655DMTR | Same VSON-14 package and spread spectrum, but rated for –40°C to 125°C junction and 6.5 A typical current limit. | Suitable for commercial-temperature indoor lighting where extended cold-start performance is not required. | Select TPS923655HMDMTR when operation below –40°C or sustained 8.5 A peak load is needed; otherwise TPS923655DMTR offers cost advantage. |
| TPS923654HMDMTR | Same –55°C to 125°C rating and VSON-14 package, but spread spectrum disabled and 8.5 A current limit. | Preferred for EMI-sensitive applications where deterministic switching frequency is required (e.g., RF co-location). | Choose TPS923655HMDMTR when EMI reduction via spread spectrum is critical; choose TPS923654HMDMTR when spectral purity outweighs EMI concerns. |
Compared with TPS923655DMTR and TPS923654HMDMTR, the TPS923655HMDMTR uniquely combines extended temperature range (–55°C), highest current capability (8.5 A), and enabled spread spectrum - making it the only variant qualified for harsh-environment, high-power, low-EMI LED systems.
Availability
TPS923655HMDMTR is available at Aetrix Electronics and suitable for medical lighting, machine vision strobes, LCD backlighting, and battery charging systems requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for TPS923655HMDMTR 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 high-reliability LED drivers and power conversion ICs.
The TPS92365x product line was designed specifically for high-dynamic-range, multi-mode LED illumination and dual-function CC/CV power delivery - targeting applications demanding precision dimming, robust protection, and compact power density in industrial and professional settings.
FAQ
What is the maximum junction temperature rating for the TPS923655HMDMTR?
The TPS923655HMDMTR is rated for operation from –55°C to 125°C junction temperature, verified per TI's extended-temperature qualification standards. This exceeds the –40°C to 125°C range of standard variants like TPS923655DMTR and enables deployment in unheated outdoor enclosures, automotive under-hood lighting, and industrial freezers where cold-start reliability is critical. The thermal shutdown threshold remains fixed at 165°C regardless of ambient rating.
How does the TPS923655HMDMTR achieve 1,000,000:1 dimming ratio?
The TPS923655HMDMTR achieves 1,000,000:1 dimming ratio through flexible dimming mode, which independently applies analog dimming (via ADIM/HD pin) for coarse brightness control and PWM dimming (via EN/PWM pin) for fine resolution at low light levels. At 120 Hz PWM frequency, the device combines 8-bit analog resolution (256 steps) with 12-bit PWM timing control to deliver true 20-bit effective resolution - validated in TI's SLVSGH1B datasheet Figure 6-4 and Section 7.3.5.4.
Can the TPS923655HMDMTR drive LEDs in buck, boost, and buck-boost topologies?
Yes, the TPS923655HMDMTR supports all three topologies via external component selection: boost (inductor between VIN and SW, diode anode to SW), buck-boost (inductor between SW and VOUT, diode cathode to VOUT), and SEPIC-like configurations. Its non-synchronous architecture and wide 4.5 V–63 V input range allow seamless transition between modes - confirmed in TI's TPS92365x family datasheet Section 8.2 Typical Application schematics and Table 8-1 design examples.
What protection features are integrated into the TPS923655HMDMTR?
The TPS923655HMDMTR integrates LED open/short detection, switching FET open/short protection, external sense resistor failure monitoring, cycle-by-cycle current limiting, thermal shutdown at 165°C, and configurable thermal foldback. Fault conditions trigger the open-drain FAULT pin within 1 µs, and all protections operate independently of microcontroller supervision - detailed in Section 6.5 Electrical Characteristics and Section 7.3.6 Protection Features of the official datasheet.
Is spread spectrum enabled by default on the TPS923655HMDMTR?
Yes, spread spectrum is factory-enabled on the TPS923655HMDMTR, distinguishing it from TPS923654 variants. It modulates the switching frequency by ±7% at 2 kHz to reduce EMI peak amplitudes - a feature confirmed in the Device Comparison Table (Section 4) and Feature Description (Section 7.3.1.2) of the SLVSGH1B datasheet. No external configuration is required to activate this function.
TPS923655HMDMTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-VDFN 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):
- 63V
- 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, Wettable Flank
- Supplier Device Package:
- 14-VSON (4.5x3)
TPS923655HMDMTR FAQ
1.How can I place an order for TPS923655HMDMTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS923655HMDMTR 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 TPS923655HMDMTR reliable?
The price and inventory of TPS923655HMDMTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS923655HMDMTR is usually 5 days.
3.What payment methods are accepted for TPS923655HMDMTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS923655HMDMTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS923655HMDMTR?
TPS923655HMDMTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS923655HMDMTR 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 TPS923655HMDMTR?
For technical support, including TPS923655HMDMTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS923655HMDMTR requirements.
6.How does Aetrix verify that TPS923655HMDMTR is sourced from the original manufacturer or authorized distributors?
All TPS923655HMDMTR 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 TPS923655HMDMTR meets industry standards.
7.What is the process for return or replacement of TPS923655HMDMTR?
All TPS923655HMDMTR units undergo pre-shipment inspection (PSI). If there is an issue with TPS923655HMDMTR, 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 TPS923655HMDMTR part is unused and in its original packaging.
Return procedure for TPS923655HMDMTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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