iPad® automotive charger reference design

This reference design provides customers an extremely small form factor but still compliant to the iPad® charge current requirement of up to 2.1A at 5V.

The switching buck, TPS54340, features switching frequency that is up to 2MHz which is above the audio band requirements.

Customers can leverage the small form factor of this reference design and can provide USB charging capability at multiple space-constraint locations within the car. ESD protection on USB pins is provided via TPD2E001.

Features Include:

– Small form factor design, PCB size: 1100X700 mils only
– Switching frequency of TPS54340 can be up to 2MHz which is above the audio band
– TPS5430 provides up to 2.1A @ 5V outputs
– ESD protection on USB pins via TPD2E001

This reference design includes:

The TPD2E001, low-capacitance 2-Channel +/-15 kV ESD-protection array for high-speed data interfaces

The TPD2E001 is a low-capacitance ±15-kV ESD-protection diode array designed to protect sensitive electronics attached to communication lines. Each channel consists of a pair of diodes that steer ESD current pulses to VCC or GND. The TPD2E001 protects against ESD pulses up to ±15-kV Human-Body Model (HBM), ±8-kV Contact Discharge, and ±15-kV Air-Gap Discharge, as specified in IEC 61000-4-2. This device has a 1.5-pF capacitance per channel, making it ideal for use in high-speed data IO interfaces.

The TPS54340, 42 V input, 3.5 A, step-down DC/DC converter with Eco-mode™

The TPS54340 is a 42 V, 3.5 A, step down regulator with an integrated high side MOSFET. The device survives load dump pulses up to 45 V per ISO 7637. Current mode control provides simple external compensation and flexible component selection. A low ripple pulse skip mode reduces the no load supply current to 146 µA. Shutdown supply current is reduced to 1 µA when the enable pin is pulled low.

Undervoltage lockout is internally set at 4.3 V but can be increased using the enable pin. The output voltage start up ramp is internally controlled to provide a controlled start up and eliminate overshoot.

A wide switching frequency range allows either efficiency or external component size to be optimized. Frequency foldback and thermal shutdown protects internal and external components during an overload condition.

Learn more by downloading the reference design below