AP6435xQ - Series of 3.5A Automotive Compliant Synchronous Buck Converters for POL Applications
Diodes Incorporated has launched the series (AP6435xQ) of 3.5A automotive compliant synchronous buck converters that includes AP64350Q, AP64351Q, and AP64352Q for Point of Load (POL) applications. The AP6435xQ combines a low quiescent current with a wide input voltage range of 3.8V to 40V. The design of the AP6435xQ’s gate drive/bootstrap allows the device to operate in low dropout (LDO) mode to achieve near 100% duty cycle.
The fully integrated 75mΩ high-side power MOSFET and 45mΩ low-side power MOSFET allows the AP6435xQ to provide high-efficiency step-down DC-DC conversion. To increase efficiency as the load current approaches zero, the devices enter pulse frequency modulation (PFM), resulting in a quiescent current of just 22μA. The frequency spread spectrum (FSS) with a switching frequency jitter of ±6% and a proprietary gate driver scheme of the AP6435xQ reduces high frequency radiated EMI noise caused by MOSFET Switching.
The AP64350Q and AP64352Q have an adjustable switching frequency, and they can be synchronized to an external clock. This feature helps in design flexibility to deliver a choice of low frequency with extremely high efficiency or high frequency for small form factor solutions whose switching frequency is outside the AM band.
The New converters are suitable to be used in applications such as automotive applications including infotainment systems, instrument clusters, telematics, advanced driver assistance systems (ADAS), and forward lighting.
Features of AP6435xQ Series
- VIN: 3.8V to 40V
- 3.5A Continuous Output Current
- 0.8V ± 1% Reference Voltage
- 22μA Low Quiescent Current (Pulse Frequency Modulation)
- Adjustable switching frequency of AP64350Q and AP64352Q: 100kHz - 2.2MHz
- Switching frequency of AP64351Q: 570kHz
- AP64351Q and AP64352Q have programmable soft-start, which reduces in-rush currents
- AP64350Q and AP64351Q have external compensation to optimize loop response
- Up to 85% Efficiency at 5mA Light Load