AMS2596S datasheet(11/15 Pages) ADMOS

11 / 15 page

AMS2596

3A 30V Step-Down Converter

3/4/2010

www.advanced-monolithic.com

Phone (925) 443-0722

Fax (925) 443-0723

Output Power and Thermal Limits

The AMS2596 junction temperature, Step-Down

converter and LDO current capability depends on the

internal dissipation and the junction to case thermal

resistance of the SO8 exposed paddle package. This

gives the junction temperature rise above the device

paddle and PCB temperature.

The temperature of the paddle and PCB will be

elevated above the ambient temperature due to the

total losses of the step down converter and losses of

other circuits and or converters mounted to the PCB.

Tjmax=Pd·θjc+Tpcb+Tamb

The losses associated with the AMS2596 overall

efficiency are;

1. Output Diode Conduction Losses

2. Inductor DCR Losses

3. AMS2596 Internal losses

a. Power Switch Forward Conduction

and Switching Losses

b. Quiescent Current Losses

The internal losses contribute to the junction

temperature

rise

above

the

case

and

PCB

temperature.

The junction temperature depends on many factors

and should always be verified in the final application

at the maximum ambient temperature. This will assure

that the device does not enter over-temperature

shutdown when fully loaded at the maximum ambient

temperature.

Figure 2. AMS2596 SO-8 Evaluation Board Top

Figure 3. AMS2596 SO-8 Evaluation Board Bottom

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