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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Diodes Incorporated PAM2841SR

Name: PAM2841SR
Brand: Diodes Incorporated
SKU: PAM2841SR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PAM2841SR

Manufacturer:: Diodes Incorporated

Category:: LED Drivers

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: PAM2841SR.pdf

Description:: IC LED DRVR RGLTR PWM 1.5A 8MSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PAM2841SR from Diodes Incorporated is a 1.5A, 40V precision white LED driver IC in MSOP-8 package, operating from 2.7V–5.5V input and delivering up to 40V output for driving ≥10 series WLEDs. It integrates fixed 1MHz switching frequency, analog/PWM dimming support, overvoltage/overcurrent/thermal/UVLO protection, and achieves peak efficiency of 90% in boost topology.

For engineers reviewing the PAM2841SR datasheet, PAM2841SR pinout, PAM2841SR application, or PAM2841SR equivalent, key selection criteria include its 1.5A switch current limit, 200mV feedback reference, 40V OVP threshold, and dual-package availability (MSOP-8/U-DFN2020-8) for thermal and layout-sensitive WLED backlight designs.

Technical Context

The PAM2841SR implements a current-mode DC-DC boost controller with internal 1.5A MOSFET switch and precision 200mV feedback reference. Its control loop uses compensation via the COMP pin and supports four distinct dimming methods: ENA-pin PWM, Comp-pin PWM, analog DC voltage, and filtered PWM - each with defined startup delays and frequency ranges.

Protection architecture includes cycle-by-cycle overcurrent detection on the SW pin, open-load OVP triggered at 1.2V on the OVP pin (corresponding to ~40V output), thermal shutdown at +150°C with +30°C hysteresis, and UVLO activation at VIN < 2.2V with 200mV hysteresis - all enabling robust operation in automotive and industrial lighting environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.7V to 5.5V - supports single-cell Li-ion, USB, or regulated 3.3V/5V rails without external LDO.
Switch Current Limit	1.5A - sets maximum inductor peak current, enabling ≥10W LED strings at typical V_F = 3.2V.
Feedback Reference	200mV ±3mV - high-precision reference enables tight LED current regulation across temperature and supply variation.
Switching Frequency	1.0MHz ±300kHz - allows compact 4.7µH–22µH inductors and reduces EMI filtering burden.
OVP Threshold	40V - protects LEDs and output capacitor during open-circuit or string-failure conditions.
Quiescent Current	200µA typical - minimizes standby power loss in always-on display backlight systems.
Thermal Shutdown	+150°C with +30°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking.

Pinout & Package

PAM2841SR is packaged in MSOP-8 (3.0mm × 4.9mm, 0.65mm pitch) with exposed thermal pad, offering θ_JA = 180°C/W and θ_JC = 75°C/W for thermally constrained PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
1 PGND	Power Ground	High-current return path for SW node; must be routed separately from signal ground to avoid noise coupling.
2 VIN	Input Supply	Connects to 2.7–5.5V source; requires local 10µF ceramic capacitor placed adjacent to pin.
3 ENA	Enable Input	Active-high logic control (V_EH = 1.2V min); enables soft-start and supports direct PWM dimming at 100–200Hz.
4 COMP	Compensation Node	Connects external RC network to stabilize control loop; also accepts PWM for dimming via nMOS gate drive.
5 GND	Signal Ground	Reference for FB, OVP, and internal circuitry; must be tied to PGND at single-point star ground.
6 FB	Current Sense Feedback	Monitors voltage across external sense resistor (R_SENSE) to regulate LED current; 200mV target.
7 OVP	Overvoltage Protection	Resistor-divider input monitoring output voltage; triggers shutdown when >1.2V (≈40V at typical divider ratio).
8 SW	Switch Drain	Drives external Schottky diode and output capacitor; carries high di/dt; trace must be short and wide.

Key Features

Feature	Design Value
Four Dimming Methods	Supports ENA-PWM (100–200Hz), Comp-PWM (100–500Hz), analog DC, and filtered PWM - enabling flexible brightness control without external MCU.
Integrated Protection Suite	Combines OCP, OVP, UVLO, and thermal shutdown - eliminates need for discrete protection ICs in cost-sensitive displays.
1MHz Fixed-Frequency Operation	Enables use of small, low-profile inductors (4.7–22µH) and reduces EMI filter size versus lower-frequency alternatives.
200mV Precision Feedback	Delivers ±1.5% LED current accuracy over temperature and line, critical for uniform backlight luminance in multi-zone LCDs.
Soft-Start on Enable	Prevents inrush current and output overshoot during power-up, protecting LEDs and reducing stress on input capacitors.

Applications

Automotive Instrument Clusters

Industrial HMI Backlights

Use Scenario: Driving 12-series WLED strings in analog gauge clusters with variable ambient light compensation.

IC Role / Device Role / Timing Role: Boost controller regulating constant LED current while supporting analog dimming via microcontroller DAC output.

Use Value: 90% peak efficiency extends battery runtime; 40V OVP prevents damage during load dump transients.

Use Scenario: Powering segmented backlights in factory-floor HMIs exposed to wide temperature (-40°C to +85°C) and ESD events.

IC Role / Device Role / Timing Role: Primary WLED driver with integrated thermal shutdown and UVLO, ensuring fail-safe operation during brownouts.

Use Value: 150°C thermal shutdown and -40°C to +85°C operating range guarantee reliability in uncontrolled industrial enclosures.

Medical Diagnostic Displays

Consumer Tablet Backlights

Use Scenario: High-accuracy backlight for radiology monitors requiring consistent color temperature and luminance stability.

IC Role / Device Role / Timing Role: Precision current regulator using 200mV FB reference and low-drift external resistors to maintain <±2% LED current tolerance.

Use Value: Tight current regulation ensures grayscale fidelity and DICOM compliance across panel lifetime.

Use Scenario: Slim-profile tablet backlight with space-constrained PCB and demand for low-noise, flicker-free dimming.

IC Role / Device Role / Timing Role: Compact MSOP-8 LED driver supporting 200Hz ENA-PWM dimming to eliminate visible flicker at all brightness levels.

Use Value: 1MHz switching enables minimal inductor footprint (<2.0mm height), critical for ultra-thin device mechanical design.

Equivalent & Alternatives

The following parts are listed as comparable options for similar WLED boost driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AL8862SP-13	Higher 2.5A switch current, 60V OVP, but no integrated OVP pin - requires external resistor divider for overvoltage detection.	Targets higher-power LED arrays (>15W); lacks dedicated OVP pin, increasing BOM count for safety-critical designs.	Select when higher output power and extended OVP headroom are required, and external OVP implementation is acceptable.
RT9397BF	1.2A switch current, 36V max output, 500kHz switching - lower efficiency (~85%) and larger inductor requirement than PAM2841SR.	Suitable for mid-power portable displays; not recommended for 10+ LED strings above 36V or high-efficiency requirements.	Choose for cost-sensitive, lower-current applications where 1MHz operation and 40V capability are unnecessary.

Compared with AL8862SP-13 and RT9397BF, the PAM2841SR delivers optimal balance of 1.5A drive strength, 40V OVP headroom, 1MHz efficiency, and integrated protection - making it ideal for space-constrained, thermally demanding WLED backlight systems requiring high reliability and design simplicity.

Availability

PAM2841SR is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial HMIs, medical diagnostic displays, and consumer tablet backlights requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for PAM2841SR 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 connectivity solutions with ISO/TS 16949-certified facilities.

The PAM2841 belongs to Diodes' precision LED driver product line, engineered specifically for high-efficiency, thermally robust WLED backlighting in automotive, industrial, and medical displays where reliability and dimming flexibility are critical.

FAQ

What dimming methods does the PAM2841SR support, and what are their frequency limits?

The PAM2841SR supports four dimming methods: (1) PWM applied directly to the ENA pin (100–200Hz), (2) PWM applied to the COMP pin via nMOS gate (100–500Hz), (3) analog DC voltage control via feedback resistor network, and (4) filtered PWM interpreted as adjustable DC. Each method has documented startup delays (0.85ms for ENA, 0.08ms for COMP) and avoids visible flicker within specified ranges.

How does the OVP function work, and what external components are required?

The OVP function monitors output voltage via a resistor divider connected to the OVP pin. When the divided voltage exceeds 1.2V (typically corresponding to 40V at the output), the device shuts down. No external comparator or reference is needed - only two resistors forming a precise divider (e.g., 1MΩ + 30.1kΩ for 40V trip) are required to set the threshold.

What is the significance of the 200mV feedback reference voltage, and how does it affect LED current accuracy?

The 200mV ±3mV feedback reference determines LED current via I_LED = 0.2V / R_SENSE. Its tight tolerance and low drift ensure ±1.5% current regulation across temperature and supply variations, directly enabling consistent luminance and color point in multi-LED arrays without per-string calibration.

Can the PAM2841SR operate reliably at full load in an ambient temperature of 75°C?

Yes - the PAM2841SR is rated for operation from –40°C to +85°C ambient, with junction temperature limited to +150°C. At 75°C ambient and 1.5A switch current, proper PCB copper area (≥250mm² thermal pad exposure) and airflow ensure junction temperature remains below 135°C, well within safe margin before thermal shutdown activates.

PAM2841SR Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: DC DC Regulator

Topology:: Step-Up (Boost)

Internal Switch(s):: Yes

Number of Outputs:: 1

Voltage - Supply (Min):: 2.7V

Voltage - Supply (Max):: 5.5V

Voltage - Output:: 40V

Current - Output / Channel:: 1.5A (Switch)

Frequency:: 1MHz

Dimming:: Analog, PWM

Applications:: -

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-MSOP

PAM2841SR FAQ

1.How can I place an order for PAM2841SR through Aetrix?

Please submit a Request for Quotation (RFQ) for PAM2841SR 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 PAM2841SR reliable?

The price and inventory of PAM2841SR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM2841SR is usually 5 days.

3.What payment methods are accepted for PAM2841SR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM2841SR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PAM2841SR?

PAM2841SR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PAM2841SR 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 PAM2841SR?

For technical support, including PAM2841SR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM2841SR requirements.

6.How does Aetrix verify that PAM2841SR is sourced from the original manufacturer or authorized distributors?

All PAM2841SR 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 PAM2841SR meets industry standards.

7.What is the process for return or replacement of PAM2841SR?

All PAM2841SR units undergo pre-shipment inspection (PSI). If there is an issue with PAM2841SR, 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 PAM2841SR part is unused and in its original packaging.

Return procedure for PAM2841SR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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