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The AP3441L is a 3A step-down DC-DC converter. At heavy load, the constant-frequency PWM control performs excellent stability and transient response. No external compensation components are required.

The AP3441L supports a range of input voltages from 2.7V to 5.5V allowing the use of a single Li+/Li-polymer cell, multiple Alkaline/NiMH cell, and other standard power sources. The output voltage is adjustable from 0.6V to the input voltage. The AP3441L employs internal power switch and synchronous rectifier to minimize external part count and realize high efficiency. During shutdown, the input is disconnected from the output and the shutdown current is less than 1μA. Other key features include over-temperature and short circuit protection, and under-voltage lockout to prevent deep battery discharge.

The AP3441L delivers 3A maximum output current while consuming only 55μA of no-load quiescent current. Ultra-low RDS(ON) integrated MOSFETs and 100% duty cycle operation make the AP3441L an ideal choice for high output voltage, high current applications which require a low dropout threshold. Pulse skip mode to maintain high efficiency at light-load conditions.

The AP3441L is available in W-DFN2020-8 (Type C) package.


  • Input Voltage: 2.7V to 5.5V
  • Output Voltage: 0.6V to VIN
  • 0.6V Reference Voltage with ±1.5% Precision
  • 55µA (Typ) No Load Quiescent Current
  • Shutdown Current: <1µA
  • 100% Duty Cycle Operation
  • 1MHz Switching Frequency
  • No External Compensation Required
  • Short Circuit Protection

AP3441L: Latch Off Protection

AP3441: Hiccup Mode Protection

  • Over Voltage Protection

AP3441L: Latch Off Protection

AP3441: Non Latch Off Protection

  • Thermal Shutdown


  • Post DC-DC Voltage Regulation
  • Set Top Boxes
  • Notebook Computer
  • PAD

Product Specifications

Product Parameters

Type Buck
Efficiency (%) 95 %
HS RDS(ON) (mΩ) N/A mΩ
LS RDS(ON) (mΩ) N/A mΩ
Frequency Typ (Hz) 1000 kHz
MinimumInput Voltage (V) 2.5 V
MaximumInput Voltage (V) 5.5 V
Output Current (mA) 3 A
Output Voltage (V) 0.6 to Vin V
Quiescent Current Typ (mA) 55 mA
Shutdown Current Typ (µA) N/A µA

Related Content


Technical Documents

Evaluation Boards and User Guides

Recommended Soldering Techniques


Orderable Part Number Status Package Environmental Compliance Packing Buy from Distributor /
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Qty. Carrier
AP3441LSHE-7 Obsolete U-DFN2020-8 GREEN 3000 T&R
AP3441LSHE-7B Active U-DFN2020-8 TPGP 3000 T&R


Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Avnet EU 3000 1/24/2022 Germany Buy Now
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Environmental Compliance Legend:
LFF: Pb-Free Finish and RoHS 5/6
TLFP: Totally Pb-Free Product and RoHS 6/6
LFGP: Pb-free Finish and Green Product, RoHS 5/6 and Halogen Free
TPGP: Totally Pb-Free and Green Product, RoHS 6/6 and Halogen Free
GREEN: Halogen-free and RoHS compliant
RoHS: RoHS compliant but NOT halogen-free


Product Change Notices

PCN # Issue Date Implementation Date Subject
PCN-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site
PCN-2493 2020-12-28 2021-03-28 Qualified Additional A/T Sites and Bill of Materials (BOM)