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Back to DC-DC Buck Converters - Automotive

AP64350Q

AUTOMOTIVE-COMPLIANT, 3.8V TO 40V INPUT, 3.5A LOW IQ SYNCHRONOUS BUCK WITH PROGRAMMABLE FREQUENCY

Evaluation Boards and User Guides

AP64350QSP-EVM-Manual-User-Guide.pdf (677 KB)

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Description

The AP64350Q is an automotive-compliant, 3.5A, synchronous buck converter with a wide input voltage range of 3.8V to 40V. The device fully integrates a 75mΩ high-side power MOSFET and a 45mΩ lowside power MOSFET to provide high-efficiency step-down DC-DC conversion.

The AP64350Q device is easily used by minimizing the external component count due to its adoption of peak current mode control.

The AP64350Q design is optimized for Electromagnetic Interference (EMI) reduction. The device has a proprietary gate driver scheme to resist switching node ringing without sacrificing MOSFET turn-on and turn-off times, which reduces high-frequency radiated EMI noise caused by MOSFET switching. AP64350Q also features Frequency Spread Spectrum (FSS) with a switching frequency jitter of ±6%, which reduces EMI by not allowing emitted energy to stay in any one frequency for a significant period of time.

The device is available in an SO-8EP package.

Feature(s)

AEC-Q100 Qualified with the Following Results
Device Temperature Grade 1: -40°C to +125°C TA Range
Device HBM ESD Classification Level H2
Device CDM ESD Classification Level C5
VIN: 3.8V to 40V
3.5A Continuous Output Current
0.8V ± 1% Reference Voltage
22μA Low Quiescent Current (Pulse Frequency Modulation)
Programmable Switching Frequency: 100kHz to 2.2MHz
External Clock Synchronization: 100kHz to 2.2MHz
Up to 85% Efficiency at 5mA Light Load
Proprietary Gate Driver Design for Best EMI Reduction
Frequency Spread Spectrum (FSS) to Reduce EMI
Low-Dropout (LDO) Mode
Precision Enable Threshold to Adjust UVLO
Protection Circuitry
Undervoltage Lockout (UVLO)
Output Overvoltage Protection (OVP)
Cycle-by-Cycle Peak Current Limit
Thermal Shutdown
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
The AP64350Q is suitable for automotive applications requiring specific change control; this part is AEC-Q100 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. https://www.diodes.com/quality/product-definitions/

Application(s)

12V Automotive Power Systems
Automotive Infotainment
Automotive Instrument Clusters
Automotive Telematics
Advanced Driver Assistance Systems

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP)	Automotive
Type	Buck
Minimum Input Voltage (V)	3.8
Maximum Input Voltage (V)	40
Output Current (A)	3.5
Minimum Output Voltage (V)	0.8
Maximum Output Voltage (V)	VIN
Quiescent Current Typ (µA)	22
Shutdown Current Typ (µA)	1
Frequency Typ (kHz)	100,2200 Adj.
HS RDS(ON) (mΩ)	75
LS RDS(ON) (mΩ)	45
Features	Enable,Light Load Efficiency,Soft-start Fixed,Frequency Adjustable,External Clock Synchronization,External Loop Compensation,UVLO Adjustable,Frequency Spread Spectrum,OVP,Overcurrent Protection,Thermal Shutdown,Synchronous Rectification