AS1310 datasheet(21/30 Pages) AMSCO

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[v1-11] 2015-Jan-28

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AS1310 − Application Information

Thermal Shutdown

To prevent the AS1310 from short-term misuse and overload

conditions the chip includes a thermal overload protection. To

block the normal operation mode all switches will be turned

OFF. The device is in thermal shutdown when the junction

temperature exceeds 150°C. To resume the normal operation

the temperature has to drop below 140°C.

A good thermal path has to be provided to dissipate the heat

generated within the package. Otherwise it’s not possible to

operate the AS1310 at its usable maximal power. To dissipate

as much heat as possible from the package into a copper plane

with as much area as possible, it’s recommended to use multiple

vias in the printed circuit board. It’s also recommended to solder

the Exposed Pad (pin 9) to the GND plane.

Note(s): Continuing operation in thermal overload conditions

may damage the device and is considered bad practice.

Always ON Operation

In battery powered applications with long standby times as

blood glucose meters, remote controls, soap dispensers, etc., a

careful battery management is required. Normally a complex

power management control makes sure that the DCDC is only

switched ON, when it is really needed. With AS1310 this

complex control can be saved completely, since the AS1310 is

perfectly suited to support always-ON operations of the

application. The efficiency at standby currents of e.g. 2μAs is

around 45% (see Figure 21).

Figure 21:

Efficiency vs. Output Current for Always ON Operation;

VOUT=3.3V

100

0.001

0.01

0.1

100

Output Current (mA)

Vin = 1.1V

Vin = 1.5V

L1: XPL2010-682M

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