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Diodes Incorporated PAM2861ABR
- Part No.:
- PAM2861ABR
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
PAM2861ABR.pdf
- Description:
- IC LED DRVR RGLTR PWM 1A TSOT25
- Quantity:
- Payment:
- Shipping:
Inventory:2,105
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Product details
Overview
PAM2861ABR from Diodes Incorporated is a 1A continuous-mode inductive step-down LED driver IC with integrated 40V NDMOS switch, designed for driving single or multiple series-connected LEDs from 6V–40V input supplies. It delivers up to 30W output power, supports DC/PWM brightness control via VSET pin, and features open/short LED protection, 97% peak efficiency, and ±5% output current accuracy.
For engineers reviewing the PAM2861ABR datasheet, PAM2861ABR pinout, PAM2861ABR application, or PAM2861ABR equivalent, key selection criteria include its internal switch rating (40V/1A), adjustable current sense threshold (100mV typ), soft-start programmability (1.5ms/nF), and TSOT25 package thermal resistance (θJA = 250°C/W) for compact LED lighting designs.
Technical Context
The PAM2861ABR implements a fixed-frequency current-mode buck converter architecture with high-side current sensing and internal 40V/0.3Ω NDMOS switch. Its VSET pin enables dual-function control: logic-level shutdown (<0.2V), linear dimming (0.3–2.5V), or PWM dimming (f < 500Hz), while ISENSE pin sets nominal LED current via external resistor (IOUT = 0.1/RS).
It integrates open-circuit LED protection, over-temperature shutdown at 150°C (40°C hysteresis), and operates across –40°C to +85°C ambient. Switching frequency is internally set at 233kHz (typ) with max 1MHz capability, and duty cycle is constrained to 25–75% for stable regulation under varying VIN and VLED conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 40V - supports wide-range industrial and automotive LED power rails without pre-regulation. |
| Max Output Current | 1A - sets upper bound for single-string high-brightness LED loads (e.g., 3× white LEDs @ 350mA–1A). |
| Current Sense Threshold | 100mV (±5%) - defines IOUT = 0.1/RS; enables precise current setting with low-power sense resistors (e.g., 0.1Ω → 1A). |
| Switching Frequency | 233kHz (typ) - balances EMI, inductor size, and efficiency; supports up to 1MHz for compact magnetics. |
| Efficiency | Up to 97% - minimizes thermal load in enclosed fixtures; achieved with low RDS(on) (0.3Ω) switch and Schottky diode compatibility. |
| Thermal Resistance θJA | 250°C/W (TSOT25) - requires PCB copper area ≥100mm² for 1A operation at 85°C ambient. |
| Shutdown Current | 40µA max - enables ultra-low standby power in battery-backed signage or emergency lighting. |
Pinout & Package
Package: TSOT25 (5-pin thin shrink small-outline transistor), 2.9mm × 2.8mm × 1.0mm, MSL3, matte tin-plated leads, 0.013g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 LX | Drain of internal NDMOS switch | Connects to inductor and flyback diode anode; carries peak switching current up to 1.5A. |
| 2 GND | Power and signal ground reference | Must be low-impedance connection to minimize noise coupling into current-sense path. |
| 3 VSET | Multi-function control input | Accepts 0.3–2.5V DC for linear dimming, PWM for digital dimming, or ≤0.2V for shutdown; capacitor-to-ground extends soft-start. |
| 4 ISENSE | High-side current sense input | Monitors voltage drop across external RS resistor between VIN and this pin; sets average LED current. |
| 5 VIN | Main power input | 6–40V supply input; requires ≥10µF X7R ceramic decoupling capacitor placed within 2mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 40V NDMOS switch | Eliminates external MOSFET and gate driver; reduces BOM count and layout area in space-constrained LED modules. |
| Single-pin VSET control | Unifies on/off, analog dimming, and PWM dimming into one pin-simplifies MCU GPIO usage and reduces system wiring. |
| Inherent open/short LED protection | Automatically disables output and enters low-IQ state if LED string opens or shorts-prevents device damage without external circuitry. |
| Soft-start programmability | External capacitor on VSET pin adds ~1.5ms/nF delay to output ramp-up-suppresses inrush current and avoids input rail sag. |
| ±5% output current accuracy | Ensures consistent luminance across production units without per-unit calibration-critical for uniform backlighting and signage. |
Applications
| Low-Voltage Halogen Replacement | Industrial Panel Lighting |
|---|---|
|
Use Scenario: Retrofitting 12V AC halogen lamps with efficient LED modules in commercial retail displays. IC Role / Device Role / Timing Role: Constant-current buck controller regulating 1A through 3–4 series white LEDs at 9–12V output. Use Value: Enables direct 12V DC replacement without transformers; 97% efficiency reduces heat sink requirements by >40% vs. linear drivers. |
Use Scenario: Powering ruggedized LED strips inside factory control panels exposed to vibration and wide temperature swings. IC Role / Device Role / Timing Role: Primary LED current regulator with built-in open-circuit protection and –40°C to +85°C operation. Use Value: Eliminates field failures due to LED string breakage; thermal shutdown prevents latch-up during ambient spikes. |
| LED Backlighting for HMI Displays | Illuminated Channel Letters & Signs |
|
Use Scenario: Driving edge-lit LCD backlights in medical or industrial human-machine interface displays requiring uniform brightness. IC Role / Device Role / Timing Role: Precision current source with <5% output variation across input voltage and temperature. Use Value: Maintains consistent luminance across 6–40V input range (e.g., 12V/24V/36V systems); eliminates visible brightness shifts during brownouts. |
Use Scenario: Powering outdoor channel letters with long LED strings powered from 24V or 36V DC distribution rails. IC Role / Device Role / Timing Role: High-voltage buck driver supporting up to 30W per channel with short-circuit fault containment. Use Value: Withstands 40V transients common in vehicle-mounted or solar-charged signage; shuts down safely on LED wire break. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8862SP-13 | 40V input, 1.2A max, external MOSFET required, no integrated switch | Requires external high-side FET and gate driver; higher BOM cost but supports >1A and custom thermal layout | Select when >1A output or discrete thermal management is needed; not pin-compatible. |
| MPQ4425AGU-AEC1-P | AEC-Q100 qualified, 36V input, 1.2A, integrated 40V MOSFET, 2.2MHz switching | Designed for automotive interior lighting; higher fSW allows smaller inductors but lower efficiency at 1A | Choose for automotive-grade reliability and PPAP support; requires revalidation of EMI filtering. |
Compared with AL8862SP-13 and MPQ4425AGU-AEC1-P, the PAM2861ABR offers lowest component count and highest efficiency at 1A in TSOT25, but lacks AEC-Q100 qualification and supports only up to 1MHz switching-making it optimal for cost-sensitive industrial and commercial LED lighting where footprint and thermal simplicity are prioritized.
Availability
PAM2861ABR is available at Aetrix Electronics and suitable for low-voltage halogen replacement, industrial panel lighting, and LED backlighting requiring stable component supply, RoHS-compliant packaging, and traceable sourcing.
Supply support for PAM2861ABR 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 lighting solutions with ISO/TS 16949 and IATF 16949 certified facilities.
The PAM2861 belongs to Diodes' LED Driver product line, engineered specifically for high-efficiency, compact constant-current buck conversion in non-automotive industrial and commercial lighting applications where integration, thermal simplicity, and cost-effectiveness are critical.
FAQ
What is the minimum recommended input capacitor value for PAM2861ABR?
The datasheet specifies a minimum 4.7µF X7R ceramic capacitor for input decoupling when the source is close to the IC. However, Diodes recommends ≥10µF X7R placed within 2mm of VIN and GND pins to ensure stability across 6–40V input range, suppress ripple-induced switching noise, and maintain 97% efficiency at full 1A load-especially critical below 12V input.
Can PAM2861ABR drive more than one LED string in parallel?
No-PAM2861ABR is designed for single-string constant-current operation. Driving parallel LED strings would cause current imbalance due to forward voltage mismatches, risking thermal runaway in the string with lower VF. For multi-string applications, use separate PAM2861ABR channels or a matrix driver IC with per-string current regulation.
How does the VSET pin behave during PWM dimming below 500Hz?
When driven with PWM <500Hz, the VSET pin modulates LED current from 1% to 100% of nominal value. The internal comparator responds to the duty cycle-not frequency-so 10% PWM duty yields ~10% average current. Below 500Hz, the device maintains full regulation bandwidth; above this, response rolls off and may cause flicker or reduced dimming linearity.
What failure modes trigger automatic shutdown in PAM2861ABR?
PAM2861ABR enters low-current shutdown during open LED (no current flow detected at ISENSE), shorted LED (excessive current sensed), junction temperature exceeding 150°C (with 40°C hysteresis), or VSET voltage ≤0.2V. In all cases, LX switching stops, quiescent current drops to ≤40µA, and the device remains latched until fault condition clears and VSET rises above 0.25V.
PAM2861ABR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1A
- Frequency:
- 233kHz ~ 1MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight, Lighting, Signage
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-25
PAM2861ABR FAQ
1.How can I place an order for PAM2861ABR through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM2861ABR 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 PAM2861ABR reliable?
The price and inventory of PAM2861ABR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM2861ABR is usually 5 days.
3.What payment methods are accepted for PAM2861ABR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM2861ABR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM2861ABR?
PAM2861ABR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM2861ABR 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 PAM2861ABR?
For technical support, including PAM2861ABR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM2861ABR requirements.
6.How does Aetrix verify that PAM2861ABR is sourced from the original manufacturer or authorized distributors?
All PAM2861ABR 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 PAM2861ABR meets industry standards.
7.What is the process for return or replacement of PAM2861ABR?
All PAM2861ABR units undergo pre-shipment inspection (PSI). If there is an issue with PAM2861ABR, 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 PAM2861ABR part is unused and in its original packaging.
Return procedure for PAM2861ABR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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