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AP3435 Dataheets PDF



Part Number AP3435
Manufacturers BCD Semiconductor
Logo BCD Semiconductor
Description Synchronous Step Down DC-DC Converter
Datasheet AP3435 DatasheetAP3435 Datasheet (PDF)

Preliminary Datasheet 1.0MHz, 3.5A, Synchronous Step Down DC-DC Converter AP3435 General Description The AP3435 is a high efficiency step-down DC-DC voltage converter. The chip operation is optimized by peak-current mode architecture with built-in synchronous power MOS switchers. The oscillator and timing capacitors are all built-in providing an internal switching frequency of 1MHz that allows the use of small surface mount inductors and capacitors for portable product implementations. Integra.

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Preliminary Datasheet 1.0MHz, 3.5A, Synchronous Step Down DC-DC Converter AP3435 General Description The AP3435 is a high efficiency step-down DC-DC voltage converter. The chip operation is optimized by peak-current mode architecture with built-in synchronous power MOS switchers. The oscillator and timing capacitors are all built-in providing an internal switching frequency of 1MHz that allows the use of small surface mount inductors and capacitors for portable product implementations. Integrated Soft Start (SS), Under Voltage Lock Out (UVLO), Thermal Shutdown Detection (TSD) and Short Circuit Protection are designed to provide reliable product applications. The device is available in adjustable output voltage versions ranging from 0.8V to 0.9×VIN (2.7V≤VIN≤5.5V), and is able to deliver up to 3.5A. The AP3435 is available in PSOP-8 package. Features • High Efficiency Buck Power Converter • Output Current: 3.5A • Low RDS(ON) Internal Switches:100mΩ (VIN=5V) • Adjustable Output Voltage from 0.8V to 0.9×VIN • Wide Operating Voltage Range: 2.7V to 5.5V • Built-in Power Switches for Synchronous Rectification with High Efficiency • Feedback Voltage: 800mV • 1.0MHz Constant Frequency Operation • Thermal Shutdown Protection • Low Drop-out Operation at 100% Duty Cycle • No Schottky Diode Required • Input Over Voltage Protection Applications • LCD TV • Set Top Box • Post DC-DC Voltage Regulation • PDA and Notebook Computer Dec. 2012 Rev. 1. 0 PSOP-8 Figure 1. Package Type of AP3435 BCD Semiconductor Manufacturing Limited 1 Preliminary Datasheet 1.0MHz, 3.5A, Synchronous Step Down DC-DC Converter AP3435 Pin Configuration MP Package (PSOP-8) 18 27 36 45 Figure 2. Pin Configuration of AP3435 (Top View) Pin Description Pin Number 1 2 3 4 5 6 7 8 Pin Name VCC NC GND FB EN PGND SW VIN Function Supply input for the analog circuit No connection Ground pin Feedback pin. Receive the feedback voltage from a resistive divider connected across the output Chip enable pin. Active high, internal pull-high with 200kΩ resistor Power switch ground pin Switch output pin Power supply input for the MOSFET switch Dec. 2012 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 2 Preliminary Datasheet 1.0MHz, 3.5A, Synchronous Step Down DC-DC Converter AP3435 Functional Block Diagram EN 5 VCC 1 VIN 8 Saw-Tooth Generator Oscillator Over-Current Comparator FB 4 Bias Generator Soft Start Bandgap Reference Current + Sensing _ _+ + Error Modulator Amplifier Control Logic Buffer & Dead Time Control Logic _ + Over Voltage Comparator Reverse Inductor Current Comparator _ + 3 GND Figure 3. Functional Block Diagram of AP3435 7 SW 6 PGND Ordering Information AP3435 - Circuit Type Package MP: PSOP-8 G1: Green TR: Tape & Reel Package PSOP-8 Temperature Range -40 to 80°C Part Number AP3435MPTR-G1 Marking ID 3435MP-G1 Packing Type Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G1" in the part number, are RoHS compliant and green. Dec..


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