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Diodes Incorporated PAM2842TJR
- Part No.:
- PAM2842TJR
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
PAM2842TJR.pdf
- Description:
- IC LED DRVR RGLTR PWM 3.5A 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,842
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Product details
Overview
PAM2842TJR from Diodes Incorporated is a high-power LED driver IC supporting buck, boost, and SEPIC topologies to drive up to 10 high-brightness LEDs in series with 30W output capability, 97% peak efficiency, and integrated 3.5A switch with 0.1Ω RDS(ON). It operates across 5.5–40V input, delivers precise constant-current regulation via 100mV ±5mV feedback voltage, and includes full protection suite (OVP, UVP, OTP, OCP) for automotive lighting and monitor backlighting applications.
For engineers reviewing the PAM2842TJR datasheet, PAM2842TJR pinout, PAM2842TJR application, or PAM2842TJR equivalent, key selection criteria include its adjustable switching frequency (160–1.2MHz), dual current-sense architecture (high-side/low-side), thermal shutdown at +150°C with +30°C hysteresis, and compatibility with analog/PWM dimming via COMP or Sense pins.
Technical Context
The PAM2842TJR integrates a 3.5A/40V power MOSFET with programmable switching frequency controlled by an external RT resistor, enabling optimization of inductor size versus conduction loss. Its dual-sense architecture supports both high-side and low-side current sensing, allowing flexible PCB layout across topology variants while maintaining 1% LED current load regulation.
It features two independent LDOs (VDD_5V and VDD_DR), each with 4.0V UVLO threshold and 200mV hysteresis, plus an overvoltage detection circuit on the OV pin with 1.2V threshold and 70mV hysteresis-designed to clamp output voltage before switch breakdown in boost/SEPIC no-load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology Support | Buck, boost, and SEPIC - enables design flexibility for varying VIN/VLED relationships without changing IC |
| Max Output Power | 30W - sufficient for 10× 3W LEDs in series with margin for thermal derating |
| Switch RDS(ON) | 0.1Ω @ VDD_DR = 5V - minimizes conduction loss in high-current paths |
| Feedback Voltage | 100mV ±5mV - sets LED current accuracy via sense-resistor value (ILED = 0.1/RSENSE) |
| Switching Frequency Range | 160kHz to 1.2MHz - selected via RT resistor; higher frequencies reduce inductor size but increase switching loss |
| Thermal Shutdown | +150°C with +30°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking |
| Input Voltage Range | 5.5V to 40V - compatible with 12V/24V automotive systems and industrial DC supplies |
Pinout & Package
Package: QFN6x6-40 with exposed thermal pad soldered to PCB ground plane for θJA = 18.1°C/W (requires thermal vias per datasheet Note 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1–6) | Power Ground | Low-impedance return path for high-current switch node; must be connected directly to thermal pad |
| HVIN (8) | High-Voltage Input | Primary input for boost/SEPIC topologies; rated to 40V absolute max |
| EN (9) | Enable Input | Active-high logic control with soft-start; 1.5V min high threshold ensures noise immunity |
| VDD-DR (10) | Driver LDO Output | 5V ±0.5V supply for internal gate driver; 90mA current limit supports external FET biasing |
| RT (12) | Frequency Adjustment | Resistor-to-ground sets switching frequency per FSW = 24×10¹²/(RRT + 12kΩ) Hz |
| AGND (13) | Analog Ground | Reference for feedback, compensation, and OV circuits; isolated from PGND to avoid noise coupling |
| Sense− / Sense+ (14/15) | Current Sense Inputs | Differential pair measuring sense-resistor voltage; supports high-side or low-side placement |
| COMP (17) | Compensation Node | Connects to external RC network for loop stability; also accepts PWM signal for dimming control |
| VDD_5V (21) | System LDO Output | 5V ±0.5V supply for logic and analog blocks; 74mA current limit powers external circuitry |
| OV (23) | Overvoltage Detection | Monitors output via resistive divider; triggers shutdown if voltage exceeds 1.2V threshold |
| SW (25–30) | Switch Drain | High-current output node connecting to inductor/diode; requires minimized trace area to reduce EMI |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Switching Frequency | 160kHz–1.2MHz via single RT resistor - balances inductor size, efficiency, and EMI in space-constrained designs |
| Dual Current-Sense Architecture | Supports both high-side and low-side sensing - simplifies layout in buck vs. boost/SEPIC configurations |
| Integrated Dual LDOs | VDD_5V (74mA) and VDD-DR (50mA) - eliminates need for external regulators while isolating analog/driver domains |
| Three-Dimensional Protection | OVP (1.2V OV pin), OTP (+150°C), and OCP (3.5A switch limit) - ensures robust operation under fault conditions |
| PWM & Analog Dimming | COMP pin accepts 100–200Hz PWM for flicker-free dimming; Sense pin supports filtered DC dimming to avoid audible noise |
Applications
| Automotive Headlamp Driver | Monitor Backlight Controller |
|---|---|
|
Use Scenario: Driving 8–10 high-brightness white LEDs in series for adaptive front-lighting systems (AFS) in 12V/24V vehicles. IC Role / Device Role / Timing Role: Constant-current LED driver with boost topology to maintain 32–42V output across battery voltage fluctuations. Use Value: 97% peak efficiency reduces thermal load in sealed headlamp housings; UVLO prevents startup below 5.5V during cranking. |
Use Scenario: Powering edge-lit LCD backlights in commercial displays requiring uniform brightness and 10,000-hour lifetime. IC Role / Device Role / Timing Role: SEPIC-based constant-current source delivering stable 350mA to parallel LED strings with wide input range. Use Value: ±1% LED current load regulation ensures consistent luminance; thermal shutdown protects against ambient temperature drift. |
| Industrial High-Bay Lighting | Architectural Accent Lighting |
|
Use Scenario: Driving 10× 3W LEDs in warehouse high-bay fixtures powered from 36V DC microgrids. IC Role / Device Role / Timing Role: Buck-mode LED driver regulating 3A output with minimal external components and high reliability. Use Value: 0.1Ω RDS(ON) limits conduction loss to <1W at full load; TSSOP-20 package allows automated assembly on standard SMT lines. |
Use Scenario: Controlling color-tunable RGBW LED modules in museum and retail display lighting with smooth dimming. IC Role / Device Role / Timing Role: PWM-dimmable LED driver using COMP pin interface for 0–100% linear brightness control. Use Value: 100–200Hz PWM dimming avoids visible flicker and audible coil whine; analog dimming option preserves color fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-power LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXLD1371 | Fixed 1MHz switching frequency; no RT pin; lower max output current (1.5A); no SEPIC support | Targeted at compact, cost-sensitive boost-only LED drivers with fewer than 5 LEDs | Select when board space is critical and topology is fixed to boost with lower power requirements |
| LM3409HV | External MOSFET driver; supports up to 40V VIN; adjustable frequency via RT; no integrated LDOs | Used where higher efficiency is needed via discrete FET selection and thermal management is prioritized | Choose when system-level thermal design allows discrete FET placement and higher BOM flexibility is required |
Compared with ZXLD1371 and LM3409HV, the PAM2842TJR uniquely integrates dual LDOs, SEPIC capability, and 3.5A switch in QFN6x6-40 - making it optimal for multi-topology, medium-power LED systems needing self-contained power and protection.
Availability
PAM2842TJR is available at Aetrix Electronics and suitable for automotive lighting, monitor backlighting, and industrial high-bay LED applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for PAM2842TJR 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and ICs, specializing in power management, signal integrity, and LED driver solutions for industrial and automotive markets.
The PAM2842 belongs to Diodes' high-efficiency LED driver product line, engineered specifically for multi-topology, constant-current driving of high-power LED arrays in thermally constrained environments.
FAQ
What is the recommended PCB layout practice for thermal management of the PAM2842TJR?
The QFN6x6-40 package requires the exposed thermal pad to be soldered to a dedicated PGND copper area on the PCB, connected via ≥6 thermal vias (0.3mm diameter) to inner or bottom-layer ground planes. Per datasheet Note 1, this achieves θJA = 18.1°C/W; insufficient thermal connection risks thermal shutdown above 125°C junction temperature under 3A load.
How does the PAM2842TJR implement overvoltage protection in boost topology?
In boost mode, the OV pin monitors output voltage via a resistive divider. When the divided voltage exceeds 1.2V (with 70mV hysteresis), the IC disables switching to prevent SW node voltage from exceeding 40V - critical during LED open-circuit conditions where unregulated output could destroy the internal MOSFET.
Can the PAM2842TJR operate in SEPIC topology with high-side current sensing?
Yes - the device supports high-side current sensing in SEPIC configuration, as confirmed in Figure 4 (page 9) of DS36412 Rev. 2-3. The Sense+/Sense− inputs accept differential voltage across a high-side sense resistor, enabling accurate current regulation while simplifying EMI filtering on the low-voltage side of the circuit.
What is the minimum PWM dimming frequency to avoid visible LED flicker?
The datasheet specifies 100Hz as the minimum PWM frequency for flicker-free operation. Below this threshold, human observers perceive visible blinking due to persistence of vision limitations; frequencies between 100–200Hz ensure smooth dimming while avoiding audible noise generated by magnetostrictive effects in inductors.
PAM2842TJR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- SEPIC, Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 5.5V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- 3.5A (Switch)
- Frequency:
- -
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
PAM2842TJR FAQ
1.How can I place an order for PAM2842TJR through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM2842TJR 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 PAM2842TJR reliable?
The price and inventory of PAM2842TJR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM2842TJR is usually 5 days.
3.What payment methods are accepted for PAM2842TJR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM2842TJR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM2842TJR?
PAM2842TJR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM2842TJR 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 PAM2842TJR?
For technical support, including PAM2842TJR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM2842TJR requirements.
6.How does Aetrix verify that PAM2842TJR is sourced from the original manufacturer or authorized distributors?
All PAM2842TJR 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 PAM2842TJR meets industry standards.
7.What is the process for return or replacement of PAM2842TJR?
All PAM2842TJR units undergo pre-shipment inspection (PSI). If there is an issue with PAM2842TJR, 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 PAM2842TJR part is unused and in its original packaging.
Return procedure for PAM2842TJR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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