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Diodes Incorporated PAM2842RGR
- Part No.:
- PAM2842RGR
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
PAM2842RGR.pdf
- Description:
- IC LED DRV RGLTR PWM 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,172
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Product details
Overview
PAM2842RGR 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 3 A maximum output current, 5.5–40 V input range, and peak efficiency of 97%. It integrates a power MOSFET, internal 5 V LDOs (VDD_DR and VDD_5V), and operates across –40°C to +85°C for automotive lighting and monitor backlighting.
For engineers reviewing the PAM2842RGR datasheet, PAM2842RGR pinout, PAM2842RGR application, or PAM2842RGR equivalent, key selection criteria include topology flexibility (buck/boost/SEPIC), dual dimming support (analog via COMP pin and PWM), overvoltage/overcurrent/thermal protection, and TSSOP-20 package thermal performance (θJA = 90°C/W).
Technical Context
The PAM2842RGR implements a current-mode DC-DC controller with integrated 0.1 Ω main switch, adjustable switching frequency (160–1.2 MHz via RT pin), and dual feedback paths for high-side or low-side current sensing. Its COMP pin serves as both error amplifier output and PWM dimming interface.
It features two independent LDO outputs (VDD_DR and VDD_5V), each with 4.0 V UVLO threshold and 200 mV hysteresis, and an OV pin with 1.2 V threshold (±0.1 V) and 70 mV hysteresis for output voltage limiting-critical in boost/SEPIC no-load conditions where switch voltage can reach VIN + VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology Support | Buck, boost, and SEPIC-enables design reuse across varying VIN/VLED relationships without changing IC. |
| Max Output Current | 3 A continuous-supports high-power LED strings (e.g., 10 × 1 W LEDs at 350 mA). |
| Input Voltage Range | 5.5 V to 40 V-covers 12 V/24 V automotive rails and industrial DC supplies. |
| Switch RDS(ON) | 0.1 Ω typical-reduces conduction loss and thermal stress in high-current operation. |
| Feedback Voltage | 100 mV ±5 mV-sets LED current accuracy via external sense resistor (ILED = 0.1 / RSENSE). |
| Thermal Shutdown | 150°C with 30°C hysteresis-prevents permanent damage and enables auto-recovery at ≤120°C junction. |
| Quiescent Current | 1.6 µA at EN low-minimizes standby power in always-on lighting systems. |
Pinout & Package
The PAM2842RGR is housed in a thermally enhanced TSSOP-20 package with exposed pad soldered to PGND for θJA = 90°C/W. Pin 1 is marked by a dot; pins 1–4 and 10–11 are dedicated PGND connections to minimize ground impedance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1,2,3,4,10,11) | Power Ground | Low-impedance return path for high-current switch node and input/output capacitors. |
| HVIN (5) | High-Voltage Input | Primary power input for boost/SEPIC; connects to input capacitor and inductor. |
| EN (6) | Enable Input | Active-high logic control with soft-start-prevents inrush current during power-up. |
| VDD-DR (7) | Driver LDO Output | 5 V supply for gate drive and internal circuitry; current-limited to 90 mA. |
| RT (8) | Frequency Adjustment | Resistor-to-ground sets switching frequency (200 kHz–1.2 MHz); determines inductor size trade-off. |
| AGND (9) | Analog Ground | Reference for sense pins and compensation network-must be isolated from PGND except at single point. |
| Sense– (12), Sense+ (13) | Current Sense Inputs | Differential inputs for LED current measurement; support high-side or low-side placement. |
| COMP (14) | Compensation & Dimming | Error amplifier output; accepts PWM signal for analog dimming control (100–200 Hz recommended). |
| VDD_5V (15) | System LDO Output | 5 V supply for external biasing; UVLO threshold 4.0 V ensures stable startup. |
| OV (16) | Overvoltage Monitor | Connects to resistive divider to limit output voltage-protects switch in boost/SEPIC open-circuit faults. |
| SW (17,18,19) | Switch Node | Drain terminals of integrated MOSFET; requires short, wide PCB trace to minimize ringing and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Triple Topology Flexibility | Single IC supports buck (VIN > VLED), boost (VIN < VLED), and SEPIC (VIN ≈ VLED)-reduces BOM count across lighting platforms. |
| Dual Dimming Interface | COMP pin accepts PWM (100–200 Hz) for flicker-free dimming; also supports analog dimming via external RC network on Sense pin. |
| Integrated Dual LDOs | VDD_DR powers gate drive; VDD_5V supplies external circuitry-eliminates need for discrete regulators in space-constrained designs. |
| Comprehensive Fault Protection | Independent OV, OC, UVLO, and thermal shutdown circuits with hysteresis prevent latch-up and enable safe recovery. |
| Thermally Optimized Package | TSSOP-20 with exposed thermal pad achieves 90°C/W θJA-enables 30 W output without forced air cooling in standard PCB layouts. |
Applications
| Automotive Headlamp Driver | Monitor Backlight Controller |
|---|---|
|
Use Scenario: Driving 8–10 high-brightness white LEDs in adaptive front-lighting systems (AFS) with 12 V battery input. IC Role / Device Role / Timing Role: Constant-current DC-DC controller implementing boost topology to maintain 350 mA per string despite battery voltage sag to 9 V. Use Value: Integrated 0.1 Ω switch and 97% peak efficiency reduce thermal load under hood; OV protection prevents switch failure during LED open-circuit events. |
Use Scenario: Powering edge-lit LCD backlights in commercial displays requiring precise brightness control and low EMI. IC Role / Device Role / Timing Role: SEPIC-based constant-current source enabling stable 350 mA output across 12–24 V input while isolating input/output grounds. Use Value: COMP-pin PWM dimming (100–200 Hz) eliminates audible noise; low quiescent current (<2 µA) extends standby time in smart displays. |
| Industrial High-Bay Lighting | Architectural Accent Lighting |
|
Use Scenario: Driving 10 × 1 W LEDs in warehouse high-bay fixtures powered from 24–48 V DC distribution rails. IC Role / Device Role / Timing Role: Buck-mode LED driver regulating 3 A output with 5.5–40 V input range to accommodate aging power supplies and line transients. Use Value: Thermal shutdown at 150°C with 30°C hysteresis ensures reliable operation in enclosed fixtures; AGND/PGND separation minimizes current-sense error. |
Use Scenario: Controlling color-tunable RGBW LED modules in museum and retail lighting with smooth analog dimming. IC Role / Device Role / Timing Role: High-side current sense configuration simplifies PCB layout in multi-channel drivers; VDD_5V powers external RGB LED biasing. Use Value: Dual LDO outputs eliminate external regulators; 100 mV feedback reference enables ±1% LED current accuracy for consistent color rendering. |
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-frequency boost-only controller (no buck/SEPIC); external MOSFET required; 1.25 V feedback voltage. | Lacks topology flexibility and integrated switch-requires additional FET, gate driver, and layout area. | Select when only boost operation is needed and discrete FET selection is preferred for thermal management. |
| LM3409QMH/NOPB | Adjustable-frequency buck controller only; 200 mV feedback voltage; no integrated LDOs. | Requires external 5 V bias supply; limited to buck topology-unsuitable for automotive VIN < VLED cases. | Choose for cost-sensitive buck-only applications where external bias and discrete FET are acceptable. |
Compared with ZXLD1371 and LM3409QMH, the PAM2842RGR delivers broader topology support, integrated power switch, dual LDOs, and lower feedback voltage-reducing component count and improving accuracy in multi-rail LED systems.
Availability
PAM2842RGR is available at Aetrix Electronics and suitable for automotive headlamps, monitor backlighting, industrial high-bay lighting, and architectural accent lighting requiring stable component supply and long-term production continuity.
Supply support for PAM2842RGR 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 lighting solutions with ISO/TS 16949-certified operations.
The PAM2842 belongs to Diodes' high-efficiency LED driver product line, designed specifically for automotive, industrial, and display lighting applications demanding robust fault protection and topology flexibility.
FAQ
What topologies does the PAM2842RGR support, and how is topology selected?
The PAM2842RGR supports buck, boost, and SEPIC topologies. Topology selection depends on input-output voltage relationship: use boost when VINMAX < VOMIN (e.g., 12 V supply driving 36 V LED string), buck when VINMIN > VOMAX, and SEPIC when VOUT falls within VIN range. External component placement (e.g., sense resistor location, diode orientation) defines the operating mode.
How is LED current set and dimmed on the PAM2842RGR?
LED current is set using a sense resistor (ILED = 0.1 V / RSENSE) between Sense+ and Sense– pins. Dimming is achieved either by applying a 100–200 Hz PWM signal to the COMP pin (for analog dimming) or by modulating the sense node with an external RC filter. High-side or low-side current sensing is selectable via PCB layout.
What is the function of the OV pin, and how should it be configured?
The OV pin monitors output voltage via a resistive divider and triggers overvoltage protection when voltage exceeds 1.2 V (±0.1 V). In boost/SEPIC configurations, it must be set above normal operating voltage but below 40 V to protect the internal switch-e.g., 37.2 V using 360 kΩ/12 kΩ divider. It features 70 mV hysteresis and is non-latching.
Why does the PAM2842RGR have two separate ground pins (PGND and AGND), and how should they be routed?
PGND carries high-switching currents from the MOSFET and input/output capacitors; AGND references precision analog circuits (sense, COMP, OV). They must be kept separate except at a single-point connection near the IC's exposed thermal pad. Mixing them introduces noise into current sensing and causes regulation errors or instability.
PAM2842RGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) 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:
- 20-TSSOP-EP
PAM2842RGR FAQ
1.How can I place an order for PAM2842RGR through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM2842RGR 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 PAM2842RGR reliable?
The price and inventory of PAM2842RGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM2842RGR is usually 5 days.
3.What payment methods are accepted for PAM2842RGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM2842RGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM2842RGR?
PAM2842RGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM2842RGR 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 PAM2842RGR?
For technical support, including PAM2842RGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM2842RGR requirements.
6.How does Aetrix verify that PAM2842RGR is sourced from the original manufacturer or authorized distributors?
All PAM2842RGR 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 PAM2842RGR meets industry standards.
7.What is the process for return or replacement of PAM2842RGR?
All PAM2842RGR units undergo pre-shipment inspection (PSI). If there is an issue with PAM2842RGR, 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 PAM2842RGR part is unused and in its original packaging.
Return procedure for PAM2842RGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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