Contact Us 0755-83210559 ext. 805




For Reference Only

Part Number PAM2805AF
Manufacturer Diodes Incorporated
Description IC LED DRVR RGLTR 750MA SOT23-6
Datasheet PAM2805AF Datasheet
Package SOT-23-6
In Stock 103,736 piece(s)
Unit Price Request a Quote
Lead Time Can Ship Immediately
Estimated Delivery Time Jan 30 - Feb 4 (Choose Expedited Shipping)
Request for Quotation

Part Number # PAM2805AF (PMIC - LED Drivers) is manufactured by Diodes Incorporated and distributed by Heisener. Being one of the leading electronics distributors, we carry many kinds of electronic components from some of the world’s top class manufacturers. Their quality is guaranteed by its stringent quality control to meet all required standards.

For PAM2805AF specifications/configurations, quotation, lead time, payment terms of further enquiries please have no hesitation to contact us. To process your RFQ, please add PAM2805AF with quantity into BOM. does NOT require any registration to request a quote of PAM2805AF.

PAM2805AF Specifications

ManufacturerDiodes Incorporated
CategoryIntegrated Circuits (ICs) - PMIC - LED Drivers
Datasheet PAM2805AFDatasheet
TypeDC DC Regulator
TopologyStep-Up (Boost)
Internal Switch(s)Yes
Number of Outputs1
Voltage - Supply (Min)0.9V
Voltage - Supply (Max)5.5V
Voltage - Output-
Current - Output / Channel750mA
Operating Temperature-40°C ~ 85°C (TA)
Mounting TypeSurface Mount
Package / CaseSOT-23-6
Supplier Device PackageSOT-23-6

PAM2805AF Datasheet

Page 1

Page 2

PAM2805 Document number: DSxxxxx Rev. 1 - 0 1 of 9 July 2013 © Diodes Incorporated PAM2805 A Product Line of Diodes Incorporated 3-MODES/ 3W WLED DRIVER WITH 1 OR 2 CELL BATTERY Description The PAM2805 is a step-up DC-DC WLED driver with 3 modes cycling function (100% brightness,25% brightness and 8.5Hz blinking). The unique 3 modes cycling function can eliminate the needs of extra functional MCU or IC. The PAM2805 can deliver up to 750mA output current by setting an external resistor. The PAM2805 switches at a 1.0MHz constant frequency, allowing for the use of small value external inductor and ceramic capacitors. A low 95mV feedback voltage reduces the power loss in the RS for better efficiency. With its internal 2A, 100mΩ device can provide high efficiency even at heavy load. The PAM2805 is available in TSOT26 package. Features  3 Modes Cycling Function: Bright Dimming Blinking Power Off <5S Power Off <5S Power Off <5S  Reset to Bright Mode if Power Off time More Than 5S  Adjustable Output Current: Up to 750mA  8.5Hz Blinking Mode  Low Start-Up Voltage: 0.9V(typ)  Low SW on Resistance: 100mΩ  Over Temperature Protection  Over Voltage Protection  TSOT26 Package  Pb-Free Package Pin Assignments Applications  White LED Torch (Flashlight) Typical Applications Circuit ILED + 95mV/RS Top View TSOT26

Page 3

PAM2805 Document number: DSxxxxx Rev. 1 - 0 2 of 9 July 2013 © Diodes Incorporated PAM2805 A Product Line of Diodes Incorporated Pin Description Pin Number Pin Name Function 1 VIN Input Voltage 2 GND Power Ground 3 BLK Connect A 1µF CAP for blinking 4 FB Feedback 5 VOUT Output Voltage 6 SW Connected to an internal NMOS switch Block Diagram Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability. All voltages are with respect to ground. Parameter Rating Unit Supply Voltage 6 V Output Voltage 6 Storage Temperature Range -65 to +150 °C Lead Temperature (Soldering, 5 sec) 300 Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.) Parameter Rating Unit Operation Temperature Range -40 to +85 °C Junction Temperature Range -40 to +125

Page 4

PAM2805 Document number: DSxxxxx Rev. 1 - 0 3 of 9 July 2013 © Diodes Incorporated PAM2805 A Product Line of Diodes Incorporated Thermal Information Parameter Symbol Package Max Unit Thermal Resistance (Junction to Case) θJC TSOT26 130 °C/W Thermal Resistance (Junction to Ambient) θJA TSOT26 250 Internal Power Dissipation @ TA = 25°C PD TSOT26 400 mW Electrical Characteristics (@TA = +25°C, L = 2.2µH, CIN = 10µF, COUT = 10µF, CBLK = 1µF, VF = 3.4V unless otherwise specified.) Parameter Symbol Test Conditions Min Typ Max Units Input Voltage Range VIN 0.9 VF -0.2 (Note 1) V Feedback Voltage VFB 90 95 100 mV Start-Up Voltage VSTART VIN: 0V →3V, ILED = 200mA 0.9 V Hold Voltage VHOLD VIN: 3V → 0V, ILED: 750mA → 100mA 0.7 V Oscillator Frequency fOSC 0.85 1.0 1.15 MHz Over Temperature Shutdown OTS 150 °C Over Temperature Hysteresis OTH 30 °C Maximum Output Current Range IO(MAX) VIN = 2.4V 750 mA Quiescent Current IQ ILED = 0mA, VO = 3.4V, Device Switching at 1MHz 1 3 mA Switch On Resistance RDS(ON) VO = 3.4V 0.1 Ω Current Limit ILIM VO = 3.4V 2 A Over Voltage Protection (VOUT) VOVP 4.5 V Blinking Frequency FBLK CBLK = 1µF 8.5 10 Hz Note: 1. VF ---LED forward voltage

Page 5

PAM2805 Document number: DSxxxxx Rev. 1 - 0 4 of 9 July 2013 © Diodes Incorporated PAM2805 A Product Line of Diodes Incorporated Typical Performance Characteristics (@TA = +25°C, L = 2.2µF, CIN = 10µF, COUT = 10µF, CBLK = 1µF, unless otherwise specified.)

Page 6

PAM2805 Document number: DSxxxxx Rev. 1 - 0 5 of 9 July 2013 © Diodes Incorporated PAM2805 A Product Line of Diodes Incorporated Typical Performance Characteristics (cont.) (@TA = +25°C, L = 2.2µF, CIN = 10µF, COUT = 10µF, CBLK = 1µF, unless otherwise specified.)

Page 7

PAM2805 Document number: DSxxxxx Rev. 1 - 0 6 of 9 July 2013 © Diodes Incorporated PAM2805 A Product Line of Diodes Incorporated Application Information Inductor Selection The PAM2805 can use small value inductors due to its switching frequency of 1 MHz. The value of inductor will focus in the range of 2.2µH to 4.7µH for most PAM2805 applications. In typical high current white LED applications, it is recommended to use a 4.7µH inductor. The inductor should have low DCR (DC resistance) to minimize the I2R power loss, and it requires a current rating of 2A to handle the peak inductor current without saturating. Capacitor Selection An input capacitor is required to reduce the input ripple and noise for proper operation of the PAM2805. For good input decoupling, Low ESR (equivalent series resistance) capacitors should be used at the input. At least 2.2µF input capacitor is recommended for most applications. A minimum output capacitor value of 6.8µF is recommended under normal operating conditions, while a 10µF-22µF capacitor may be required for higher power LED current. A reasonable value of the output capaci tor depends on the LED current. The ESR of the output capacitor is the important parameter to determine the output voltage ripple of the converter, so low ESR capacitors should be used at the output to reduce the output voltage ripple. The small size of ceramic capacitors is an excellent choice for PAM2805 applications. The X5R and X7R types are preferred because they maintain capacitance over wide voltage and temperature ranges. Diode Selection It's indispensable to use a Schottky diode rated at 2A with the PAM2805. Using a Schottky diode with a lower forward voltage drop is better to improve the power LED efficiency, and its voltage rating should be greater than the output voltage. SS22 is recommended Schottky diode for rectifier. LED Current Setting The LED current is set by the single external Rs resistor connected to the FB pin as shown in the typical application circuit on Page 1. The typical FB reference is internally regulated to 95mV. The LED current is 95mV/R1. It's recommended to use a 1% or better precision resistor for the better LED current accuracy. The formula for RS selection is shown as follows:     V3VatmAI/mV95R INLEDS  Typically, for 1W(330mA) and 3W(750mA) LED light applications, the RS are 0.288Ω and 0.127Ω respectively. 3 Modes Cycling The PAM2805 has three modes: 100% brightness, 25% brightness and blinking (typical 8.5Hz). The mode change is triggered by power on/off actions and cycles in the following sequence: bright, dimming, blinking and back to bright mode. The PAM2805 will reset to the bright mode after being power off for more than 5 seconds. Low Voltage Start-Up and Soft-Start The PAM2805 has a build-in low voltage startup circuit for the best battery life solution. It can start up at 0.9V VIN typically when the preset LED current is 200mA. The soft-start function is made by clamping the output voltage of error amplifier with another voltage source which increases slowly from zero to near VIN dur ing the soft-start period. Therefore, the duty cycle of the PWM will be increased from zero to maximum in this period. The charging time of the inductor will be limited by the smaller duty so that the inrush current can be reduced to an acceptable value. Over Voltage Protection The output voltage of PAM2805 is monitored by Over Voltage Protection circuit. Once VOUT goes over VOVP, typically 4.5V, the power NMOS is turned off and SW pin stops switching. Then, the VOUT is clamped to around VOVP. Over Current Protection The inductor current during charging period is detected by a current sensing circuit. When the value is larger than current limiting ILIM, the power NMOS is turned off so that the inductor will be forced to leave charging stage and enter discharging stage. Therefore, the inductor peak current will not exceed ILIM, whose minimum value is 2A.

Page 8

PAM2805 Document number: DSxxxxx Rev. 1 - 0 7 of 9 July 2013 © Diodes Incorporated PAM2805 A Product Line of Diodes Incorporated Application Information PCB Layout Guidelines As for all switching power supplies, the layout and components placement of the PAM2805 is an important step in the design; especially at high peak currents and high switching frequencies. The input capacitor and output capacitor should be placed respectively as close as possible to the input pin and output pin of the IC; the inductor and schottky diode should be placed as close as possible to the switch pin by using wide and short traces for the main current path; the current sense resistor should be placed as close as possible between the ground pin and feedback pin. Ordering Information Part Number Marking Package Type Standard Package PAM2805AF ECXYW TSOT26 3000 Units/Tape&Reel Marking Information Top View TSOT26

Page 9

PAM2805 Document number: DSxxxxx Rev. 1 - 0 8 of 9 July 2013 © Diodes Incorporated PAM2805 A Product Line of Diodes Incorporated Package Outline Dimensions (All dimensions in mm.) TSOT26

PAM2805AF Reviews

Average User Rating
5 / 5 (178)
★ ★ ★ ★ ★
5 ★
4 ★
3 ★
2 ★
1 ★

Write a Review

Not Rated
Thanks for Your Review!


December 19, 2020

Wow super fast delivery, product as described good company!


December 15, 2020

★★★★★ Nice Item, Shipped Fast And As Promised! ★★★★★ THANKS!!!!! ★★★★★


December 15, 2020

I was glad to find this product being sold at a great price. They were the perfect replacement.


December 12, 2020

Worked good to turn my AC welder into a DC welder.


December 10, 2020

Excellent website experience for search any product I want, problem solvers. You guys I can trust and reply on.


December 8, 2020

I have used 2 of the 10 units so far and they work fine.


November 27, 2020

Perfectly satisfied with item. Top supplier on my list.

PAM2805AF Guarantees

Service Guarantee

Service Guarantees

We guarantee 100% customer satisfaction.

Our experienced sales team and tech support team back our services to satisfy all our customers.

Quality Guarantee

Quality Guarantees

We provide 90 days warranty.

If the items you received were not in perfect quality, we would be responsible for your refund or replacement, but the items must be returned in their original condition.

PAM2805AF Packaging

Verify Products
Customized Labels
Professional Packaging

PAM2805AF Related Products

SIT1602BI-83-XXS-38.000000X SIT1602BI-83-XXS-38.000000X SiTIME, -40 TO 85C, 7050, 50PPM, 2.25V-3, -, - View
SIT1602BI-83-25S-66.666600T SIT1602BI-83-25S-66.666600T SiTIME, -40 TO 85C, 7050, 50PPM, 2.5V, 6, -, - View
SIT1602BI-23-28E-18.432000E SIT1602BI-23-28E-18.432000E SiTIME, -40 TO 85C, 3225, 50PPM, 2.8V, 1, -, - View
ATS240 ATS240 CTS-Frequency Controls, CRYSTAL 24.0000MHZ SERIES T/H, HC49/US, - View
CKG57KX7T2E225K335JJ CKG57KX7T2E225K335JJ TDK Corporation, CAP CER 2.2UF 250V X7T SMD, Nonstandard SMD, - View
hotZXT13P20DE6TA ZXT13P20DE6TA Diodes Incorporated, TRANS PNP 20V 4A SOT23-6, SOT-23-6, - View
EL 1V EL 1V Sanken, DIODE GEN PURP 400V 1.5A AXIAL, Axial, - View
MC8641DVU1500KC MC8641DVU1500KC NXP, IC MPU MPC86XX 1.5GHZ 1023FCCBGA, 1023-BCBGA, FCCBGA, - View
8N3SV75EC-0054CDI 8N3SV75EC-0054CDI IDT, Integrated Device Technology Inc, IC OSC VCXO 25MHZ 6-CLCC, 6-CLCC, - View
TNPW2010422KBETF TNPW2010422KBETF Vishay Dale, RES SMD 422K OHM 0.1% 0.4W 2010, 2010 (5025 Metric), - View
AIT6-28-21PSX AIT6-28-21PSX Amphenol Industrial Operations, ER 37C 37#16 PIN PLUG, -, - View
5936-9 5936-9 Pomona Electronics, BANANA PLUG 2MM 10PCS WHITE, -, - View
Payment Methods
Delivery Services

Quick Inquiry


Certified Quality

Heisener's commitment to quality has shaped our processes for sourcing, testing, shipping, and every step in between. This foundation underlies each component we sell.

ISO9001:2015, ICAS, IAF, UKAS

View the Certificates

Do you have any question about PAM2805AF?

0755-83210559 ext. 805 heisener007 3008774228 Send Message

Featured Products






CAP TANT 10UF 16V 10% 1206















View More >>

PAM2805AF Tags

  • PAM2805AF
  • PAM2805AF PDF
  • PAM2805AF datasheet
  • PAM2805AF specification
  • PAM2805AF image
  • Diodes Incorporated
  • Diodes Incorporated PAM2805AF
  • buy PAM2805AF
  • PAM2805AF price
  • PAM2805AF distributor
  • PAM2805AF supplier
  • PAM2805AF wholesales

PAM2805AF is Available in