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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

Type Buck
Efficiency (%) 95 %
HS RDS(ON) (mΩ) 250 mΩ
LS RDS(ON) (mΩ) 170 mΩ
Frequency Typ (Hz) 1500 kHz
MinimumInput Voltage (V) 2.5 V
MaximumInput Voltage (V) 5.5 V
Output Current (mA) 1 A
Output Voltage (V) 0.6 to VIN V
Quiescent Current Typ (mA) 0.04 mA
Shutdown Current Typ (µA) 0.1 µA

Technical Documents

Application Notes

Evaluation Boards and User Guides

Recommended Soldering Techniques

TN1.pdf

Orderable Part Number Status Package Environmental Compliance Packing Buy from Distributor /
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Request Samples
Qty. Carrier
AP3428AKTTR-G1 Active TSOT25 TPGP 3000 T&R

AP3428AKTTR-G1

Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Future Electronics - Europe 3000 1/19/2022 England Contact Sales
Request Sample
AP3428AWT-7 Active TSOT25 TPGP 3000 T&R

AP3428AWT-7

Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Avnet EU 3000 1/19/2022 Germany Buy Now
Request Sample
AP3428KTTR-G1 Active TSOT25 TPGP 3000 T&R Contact Sales Request Sample
AP3428WT-7 Active TSOT25 TPGP 3000 T&R Contact Sales Request Sample

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

PCNs

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-2480 2020-10-21 2021-01-21 Additional Qualified (AT) Assembly Test Site SIMAT