Diodes Incorporated
SOT25

Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details.

SOT25.png
SOT25

Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details.

SOT25.png
U DFN2020 6 Type F

Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details.

U-DFN2020-6-Type-F.png
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AP3428

1.5MHZ, 1A STEP-DOWN DC-DC BUCK CONVERTER

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Description

The AP3428/A is a 1A 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 AP3428/A supports a range of input voltages from 2.5V 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 AP3428/A 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 AP3428/A delivers 1A maximum output current while consuming only 40μA of no-load quiescent current. Ultra-low RDS(ON) integrated MOSFETs and 100% duty cycle operation make the AP3428/A an ideal choice for high output voltage, high current applications which require a low dropout threshold.

The AP3428/A is available in TSOT25, U-DFN2020-6 packages.

Feature(s)

  • Output Current: Up to 1A
  • Output Voltage: 0.6V to VIN
  • Input Voltage: 2.5V to 5.5V
  • 0.6V Reference Voltage With ±2% Precision
  • 40μA (Typ) No Load Quiescent Current
  • Shutdown Current: <1μA
  • 100% Duty Cycle Operation
  • 1.5MHz Switching Frequency
  • Internal Soft Start
  • No External Compensation Required
  • Current Limit Protection
  • Thermal Shutdown
  • TSOT25, U-DFN2020-6 Packages

Application(s)

  • Notebook PCs
  • TVs
  • Set-top-boxes
  • Networking Equipments

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Standard
Type Buck
Minimum Input Voltage (V) 2.5
Maximum Input Voltage (V) 5.5
Output Current (A) 1
Minimum Output Voltage (V) 0.6
Maximum Output Voltage (V) VIN
Quiescent Current Typ (µA) 40
Shutdown Current Typ (µA) 0.1
Frequency Typ (kHz) 1500
HS RDS(ON) (mΩ) 250
LS RDS(ON) (mΩ) 170

Technical Documents

Application Notes

Evaluation Boards and User Guides

Recommended Soldering Techniques

TN1.pdf

Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site
PCN-2480 2020-10-21 2021-01-21 Additional Qualified (AT) Assembly Test Site SIMAT