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Texas Instruments TPS923655MDMTR
- Part No.:
- TPS923655MDMTR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
TPS923655MDMTR.pdf
- Description:
- 65-V, 4-A BOOST ORBUCK-BOOST LED
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
TPS923655MDMTR 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), hybrid/flexible dimming up to 1,000,000:1 at 120Hz, and CC/CV operation for LED driving and battery charging. It operates from 4.5V–63V input, delivers up to 6.5A cycle-by-cycle current limit, and features spread spectrum EMI reduction.
For engineers reviewing the TPS923655MDMTR datasheet, TPS923655MDMTR pinout, TPS923655MDMTR application, or TPS923655MDMTR equivalent, this device is selected for high-dynamic-range lighting control in machine vision strobes, medical surgical lamps, and LCD backlighting where precise analog+PWM dimming, wide VIN, and thermal robustness across –55°C to 125°C junction are critical.
Technical Context
The TPS923655MDMTR uses adaptive off-time current mode control with smart sampling to enable inductive fast dimming (IFD), achieving <150ns PWM pulse width support and high dimming accuracy across hybrid and flexible modes. Its dual-input dimming logic (EN/PWM and ADIM/HD pins) configures four distinct dimming schemes without external controllers.
It integrates constant-current (CC) and constant-voltage (CV) regulation with configurable OVP thresholds via resistor dividers on the OVP pin, cycle-by-cycle current limiting, and thermal foldback set via RTEMP on the TEMP pin-enabling system-level protection without added components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 63V - supports wide industrial and automotive supply rails including 12V, 24V, and 48V systems without pre-regulation. |
| Max Output Current | 4A continuous LED drive - enables high-brightness multi-string configurations with single-chip solution. |
| Current Limit | 6.5A typical cycle-by-cycle - protects against short-circuit and inrush events while maintaining stable operation under transient loads. |
| Switching Frequency | 100kHz to 2.2MHz - adjustable via FSET pin resistor; higher frequencies allow smaller magnetics; lower frequencies improve efficiency and thermal performance. |
| Dimming Resolution | 1,000,000:1 at 120Hz PWM - achieved via flexible dimming combining analog control (for high-brightness linearity) and PWM (for deep dimming), critical for medical imaging and machine vision. |
| Junction Temp Range | –55°C to +125°C - extended low-temp rating vs standard TPS923655 variants enables deployment in harsh environments like outdoor lighting and industrial automation. |
| Spread Spectrum | Enabled - ±7% frequency dithering at 2kHz reduces peak EMI emissions, easing compliance with CISPR-25 Class 5 in automotive applications. |
Pinout & Package
VSON-14 package (4.5mm × 3.0mm) with exposed thermal pad; optimized for high-power density and thermal dissipation in compact LED driver designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND / AGND | Power and analog ground | Separate ground paths minimize noise coupling between power switching and feedback circuits; thermal pad connects to both for enhanced heat transfer. |
| VIN | Main input supply | Accepts 4.5–63V DC; powers internal LDO and switching FET; UVLO threshold at 3.0V rising edge ensures reliable startup under brownout conditions. |
| VCC | Internal LDO output | 5.15V regulated supply for internal circuitry; requires 1μF capacitor to AGND; soft-start time depends on capacitor value. |
| EN/PWM | Enable or PWM dimming input | High = always-on; low = disable; PWM signal = direct PWM dimming; minimum 150ns pulse width supported for ultra-fast strobing. |
| ADIM/HD | Analog/hybrid dimming control | Pull-high = PWM-only; pull-low = hybrid dimming; PWM input = analog dimming; enables seamless transition between dimming methods at runtime. |
| FAULT | Open-drain fault indicator | Asserts low on LED open/short, FET failure, thermal shutdown, or sense resistor fault; allows system-level fault logging and safe shutdown. |
| TEMP | Thermal foldback configuration | Resistor-to-AGND sets foldback curve; direct AGND connection disables foldback; enables programmable derating before thermal shutdown. |
| FSET | Switching frequency set | Resistor-to-AGND selects frequency from 100kHz–2.2MHz; e.g., 59kΩ = 400kHz; determines tradeoff between efficiency, EMI, and component size. |
| COMP | Error amplifier output | Connects external compensation network (R+C) to AGND; bandwidth and phase margin tuned per application for stability with varying LED loads. |
| OVP | Overvoltage protection input | Resistive divider sets LED open-circuit detection threshold; prevents overvoltage damage to LEDs during string breakage or disconnection. |
| CSP / CSN | Current sense differential inputs | Monitor LED current via external sense resistor; 200mV reference enables accurate CC regulation; supports bidirectional sensing for buck-boost topology. |
| SW | Switching node | Drives external inductor and Schottky diode; connected internally to 150mΩ NMOS FET; layout requires minimized loop area for EMI and efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Inductive Fast Dimming (IFD) | Enables <150ns PWM pulses with sub-microsecond response, preserving LED current waveform integrity during rapid strobe sequences in machine vision. |
| Hybrid Dimming (2,000:1 @ 20kHz) | Combines analog control above 12.5% duty cycle and PWM below it-eliminates flicker and maintains linearity across full brightness range. |
| Configurable Thermal Foldback | Adjustable via RTEMP to reduce LED current gradually as temperature rises-prevents abrupt shutdown and extends operational uptime in enclosed fixtures. |
| Integrated Low-Side NMOS (150mΩ) | Eliminates external switch and gate driver; reduces BOM count and PCB area; supports up to 6.5A peak current with minimal conduction loss. |
| CC/CV Dual-Mode Operation | Supports constant-current LED driving and constant-voltage battery charging or TEC control from same IC-reducing system component count in multi-function devices. |
Applications
| Machine Vision Strobe | Medical Surgical Lamp |
|---|---|
|
Use Scenario: High-speed camera illumination synchronized to exposure timing in automated inspection systems. IC Role / Device Role / Timing Role: LED driver with <150ns PWM capability and IFD enabling precise microsecond-level light pulses without current droop. Use Value: Eliminates motion blur and ensures consistent photon delivery across frame rates up to 100kHz, improving defect detection accuracy. |
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 delivering 1,000,000:1 range at 120Hz-no visible flicker at any brightness level. Use Value: Enables surgeon-selectable brightness from ambient room light to intense focal illumination without perceptible stepping or color shift. |
| LCD Backlighting | Outdoor Street Lighting |
|
Use Scenario: Dynamic local dimming in large-format displays using segmented LED arrays. IC Role / Device Role / Timing Role: CC/CV-capable driver operating in constant-voltage mode for gate bias and constant-current for LED strings. Use Value: Reduces system-level component count by consolidating backlight and display bias supplies into one IC with shared thermal management. |
Use Scenario: Smart streetlight with adaptive dimming based on ambient light and traffic sensors across wide temperature ranges. IC Role / Device Role / Timing Role: Robust LED driver rated for –55°C to +125°C junction, supporting cold-start in arctic climates and sustained operation in desert heat. Use Value: Ensures reliable lumen maintenance and dimming fidelity over 10+ year field life without thermal derating or firmware intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS923655DMTR | VSON-14, same 6.5A current limit and spread spectrum, but rated for –40°C to +125°C junction only. | Suitable for commercial/industrial indoor lighting where extended low-temp operation is not required. | Select when cost sensitivity outweighs need for –55°C operation; identical pinout and firmware compatibility. |
| TPS923655DRRR | WSON-12 (3.0mm × 3.0mm), same electrical specs, no exposed thermal pad, RθJA = 47.4°C/W vs 39.1°C/W for VSON-14. | Better suited for space-constrained designs where footprint is prioritized over thermal performance. | Choose for compact PCB layouts with adequate airflow; requires tighter thermal design due to higher thermal resistance. |
Compared with TPS923655DMTR and TPS923655DRRR, the TPS923655MDMTR provides unique –55°C operational capability and lowest thermal resistance in VSON-14, making it optimal for outdoor, automotive, and mission-critical lighting where reliability across extreme ambient conditions is non-negotiable.
Availability
TPS923655MDMTR is available at Aetrix Electronics and suitable for machine vision strobes, medical surgical lamps, and outdoor street lighting requiring stable component supply, long-term lifecycle assurance, and guaranteed traceability.
Supply support for TPS923655MDMTR 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 driver innovation.
The TPS92365x product line was designed specifically for high-performance, thermally demanding LED lighting and power conversion applications-emphasizing wide input range, multi-mode dimming, and integrated protection in compact packages.
FAQ
What is the operating junction temperature range for TPS923655MDMTR?
The TPS923655MDMTR is rated for operation from –55°C to +125°C junction temperature, distinguishing it from standard TPS923655 variants (–40°C to +125°C). This extended low-temperature capability enables reliable startup and regulation in arctic outdoor lighting, automotive cold-soak conditions, and industrial freezer environments where conventional drivers may fail to initialize.
Does TPS923655MDMTR support both constant-current and constant-voltage modes?
Yes, the TPS923655MDMTR supports dual-mode operation: constant-current (CC) for LED driving and constant-voltage (CV) for battery charging or TEC control. The mode is determined by external feedback configuration-CC uses CSP/CSN current sense, while CV uses OVP pin voltage regulation-allowing one IC to serve multiple power conversion functions in space-constrained systems.
How does the hybrid dimming mode work on TPS923655MDMTR?
In hybrid dimming mode, the TPS923655MDMTR regulates LED current using analog dimming (via ADIM/HD pin) for brightness levels above 12.5% duty cycle and switches to PWM dimming (via EN/PWM pin) below 12.5%. This preserves linearity and eliminates flicker at high brightness while achieving deep dimming ratios up to 2,000:1 at 20kHz-ideal for medical and professional lighting.
What is the minimum PWM pulse width supported by TPS923655MDMTR?
The TPS923655MDMTR supports a minimum PWM pulse width of 150ns in direct PWM dimming mode, enabled when the ADIM/HD pin is held high and EN/PWM receives the PWM signal. This ultra-narrow pulse capability ensures precise strobe timing in high-speed machine vision cameras without current droop or delay, maintaining consistent photon flux per exposure.
Can TPS923655MDMTR be used in buck-boost topology?
Yes, the TPS923655MDMTR is explicitly designed for non-synchronous boost and buck-boost topologies, supporting common-cathode LED configurations and single-layer PCB layouts. Its integrated low-side NMOS FET, adaptive off-time control, and wide 4.5V–63V input range make it suitable for applications where output voltage may exceed or fall below input-such as automotive 12V systems driving 24V LED strings.
TPS923655MDMTR 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)
TPS923655MDMTR FAQ
1.How can I place an order for TPS923655MDMTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS923655MDMTR 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 TPS923655MDMTR reliable?
The price and inventory of TPS923655MDMTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS923655MDMTR is usually 5 days.
3.What payment methods are accepted for TPS923655MDMTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS923655MDMTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS923655MDMTR?
TPS923655MDMTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS923655MDMTR 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 TPS923655MDMTR?
For technical support, including TPS923655MDMTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS923655MDMTR requirements.
6.How does Aetrix verify that TPS923655MDMTR is sourced from the original manufacturer or authorized distributors?
All TPS923655MDMTR 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 TPS923655MDMTR meets industry standards.
7.What is the process for return or replacement of TPS923655MDMTR?
All TPS923655MDMTR units undergo pre-shipment inspection (PSI). If there is an issue with TPS923655MDMTR, 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 TPS923655MDMTR part is unused and in its original packaging.
Return procedure for TPS923655MDMTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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