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Diodes Incorporated PAM2805EV1
- Part No.:
- PAM2805EV1
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Driver Evaluation Boards
- Package:
- Datasheet:
-
PAM2805EV1.pdf
- Description:
- EVAL BOARD FOR PAM2805
- Quantity:
- Payment:
- Shipping:
Inventory:4,060
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Product details
Overview
PAM2805 from Diodes Incorporated is a 3-mode step-up DC-DC white LED driver IC in SOT23-6 package, delivering up to 750mA output current with 95mV feedback voltage, 1.0MHz switching frequency, and integrated 2A/100mΩ NMOS switch. It enables flashlight applications with brightness cycling (100%/25%/8.5Hz blink) without external MCU control.
For engineers reviewing the PAM2805 datasheet, PAM2805 pinout, PAM2805 application, or PAM2805 equivalent, key selection criteria include low 0.9V start-up voltage, over-voltage protection at 4.5V, thermal shutdown at +150°C, and compatibility with single/dual-cell Li-ion or alkaline battery inputs.
Technical Context
The PAM2805 integrates a constant-frequency PWM controller with internal power switch, feedback regulation via 95mV reference, and mode sequencing logic triggered by power-cycle events. Its 1.0MHz oscillator enables compact 2.2–4.7µH inductors and ceramic input/output capacitors.
It implements analog current sensing for over-current protection (2A limit), voltage monitoring for over-voltage clamping (4.5V threshold), and thermal shutdown with 30°C hysteresis. The BLK pin accepts a 1µF capacitor to set blinking frequency at 8.5Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 750mA adjustable via external Rs resistor (95mV/Rs) |
| Switching Frequency | 1.0MHz fixed - enables use of small 2.2µH inductor and low-ESR ceramic caps |
| Feedback Voltage | 95mV typical - minimizes I²R loss in current-sense resistor for higher efficiency |
| Start-Up Voltage | 0.9V typical at 200mA load - supports deep-discharge single-cell alkaline or Li-ion operation |
| Over-Voltage Threshold | 4.5V - clamps output to protect LEDs and downstream circuitry |
| Thermal Shutdown | +150°C with +30°C hysteresis - prevents permanent damage during sustained overload |
| Internal Switch RDS(on) | 100mΩ - sustains high efficiency (>85% typical at 3W) even under 750mA load |
Pinout & Package
Package: SOT23-6, surface-mount, Pb-free, 3000 units per tape-and-reel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Input supply rail | Accepts 0.9–6V input; powers internal bias circuits and switch driver |
| 2 GND | Power ground reference | Common return for input cap, output cap, Rs, and BLK capacitor |
| 3 BLK | Blink timing node | Connects 1µF capacitor to set 8.5Hz oscillation for blink mode |
| 4 FB | Current-sense feedback | Monitors voltage across external Rs; regulates LED current to 95mV/Rs |
| 5 VOUT | Boost output node | Drives LED anode; connects to Schottky diode cathode and output capacitor |
| 6 SW | Switch node | Drives external Schottky diode anode and inductor; internal 2A/100mΩ NMOS drain |
Key Features
| Feature | Design Value |
|---|---|
| 3-mode cycling logic | Hardware-based state machine cycles bright → dim → blink → reset on >5s power-off, eliminating MCU dependency |
| Low-voltage start-up | Operates from 0.9V input - extends usable battery range in single-cell flashlight designs |
| Integrated 2A switch | 100mΩ RDS(on) reduces conduction loss and thermal stress vs. external FET solutions |
| Over-voltage protection | Clamps VOUT at 4.5V to prevent LED overvoltage failure in open-circuit or thermal derating conditions |
| Soft-start function | Gradually increases PWM duty cycle to limit inrush current and reduce mechanical stress on LEDs |
Applications
| Handheld Flashlight | Emergency Beacon |
|---|---|
Use Scenario: Portable battery-powered illumination tool with user-activated brightness modes. IC Role / Device Role / Timing Role: WLED driver providing regulated current and hardware-mode cycling (bright/dim/blink). Use Value: Eliminates need for microcontroller or mode-switching logic, reducing BOM count and firmware complexity. | Use Scenario: Low-power visual alert system powered by coin cell or AA batteries. IC Role / Device Role / Timing Role: Self-timed blink generator with built-in 8.5Hz oscillator via BLK pin capacitor. Use Value: Delivers consistent blink rate without external timing components or clock source. |
| Portable Diagnostic Light | Industrial Inspection Lamp |
Use Scenario: Compact medical or field-service light requiring stable 330mA or 750mA LED drive. IC Role / Device Role / Timing Role: Precision current regulator using 95mV FB reference and 1% Rs resistor. Use Value: Maintains ±3% LED current accuracy across temperature and input voltage variation. | Use Scenario: Ruggedized work lamp operating from 1–2 alkaline cells in variable ambient temperatures. IC Role / Device Role / Timing Role: High-efficiency boost converter with thermal shutdown (+150°C) and over-voltage clamp (4.5V). Use Value: Ensures safe, uninterrupted operation under load transients and battery voltage sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PAM2803 | Same pinout, lower max output current (500mA), no blinking mode | Suitable only for static-brightness flashlight designs without blink requirement | Select when blink functionality is unnecessary and thermal budget is constrained |
| ZXSC380 | Inductorless charge-pump topology, fixed 350mA output, no mode cycling | Requires fewer external components but limited to <1W LED loads and no programmable modes | Prefer for ultra-compact, low-cost single-brightness applications with strict size constraints |
Compared with PAM2805, PAM2803 sacrifices blink capability and peak current for reduced thermal load, while ZXSC380 trades mode flexibility and output headroom for component count reduction - making PAM2805 uniquely suited for multi-function handheld lighting where hardware-based mode cycling is critical.
Availability
PAM2805 is available at Aetrix Electronics and suitable for handheld flashlights, emergency beacons, portable diagnostic lights, and industrial inspection lamps requiring stable component supply despite end-of-life status.
Supply support for PAM2805 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 analog ICs, headquartered in Plano, Texas, serving automotive, industrial, computing, and consumer markets.
The PAM2805 belongs to Diodes' LED driver product line, designed specifically for cost-sensitive, battery-powered lighting applications requiring integrated mode control and wide-input-voltage operation.
FAQ
What is the minimum input voltage required for PAM2805 to start regulating LED current?
The PAM2805 starts up at 0.9V typical when driving 200mA LED current, enabling operation down to near-dead battery voltage in single-cell alkaline or Li-ion systems. This low start-up threshold is achieved via dedicated internal bias circuitry independent of output load.
How is LED brightness level controlled in the PAM2805's 3-mode cycling function?
Brightness levels are fixed by internal logic: 100% (full current), 25% (reduced current via duty-cycle modulation), and blinking (8.5Hz on/off). No external signal or resistor adjusts these levels - mode transitions occur automatically on power-on/off cycling with >5s off-time resetting to full brightness.
Can the PAM2805 drive more than one white LED in series?
Yes - the PAM2805 supports series-connected white LEDs as long as total forward voltage remains below its 4.5V over-voltage protection threshold and within the 6V absolute maximum output rating. Typical configuration uses 1–3 LEDs depending on VF and battery voltage.
Why does the datasheet recommend a Schottky diode rated for 2A?
The internal switch limits peak inductor current to 2A minimum; the external Schottky diode must handle this same peak current during discontinuous conduction mode. SS22 (2A/40V) is recommended to ensure reliable rectification without saturation or thermal runaway under transient loads.
PAM2805EV1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Packaging:
- Box
- Product Status:
- Obsolete
- Current - Output / Channel:
- 750mA
- Outputs and Type:
- 1 Non-Isolated Output
- Voltage - Output:
- -
- Features:
- Dimmable
- Voltage - Input:
- -
- Contents:
- Board(s)
- Utilized IC / Part:
- PAM2805
PAM2805EV1 FAQ
1.How can I place an order for PAM2805EV1 through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM2805EV1 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 PAM2805EV1 reliable?
The price and inventory of PAM2805EV1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM2805EV1 is usually 5 days.
3.What payment methods are accepted for PAM2805EV1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM2805EV1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM2805EV1?
PAM2805EV1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM2805EV1 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 PAM2805EV1?
For technical support, including PAM2805EV1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM2805EV1 requirements.
6.How does Aetrix verify that PAM2805EV1 is sourced from the original manufacturer or authorized distributors?
All PAM2805EV1 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 PAM2805EV1 meets industry standards.
7.What is the process for return or replacement of PAM2805EV1?
All PAM2805EV1 units undergo pre-shipment inspection (PSI). If there is an issue with PAM2805EV1, 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 PAM2805EV1 part is unused and in its original packaging.
Return procedure for PAM2805EV1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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