ams Datasheet Page 21
[v1-11] 2015-Jan-28 Document Feedback
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
v i as i n t h e p r in te d ci rc u it b o ar d . I t ’s a l so r ec o m m en d ed t o s o ld e r
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;
V
OUT
=3.3V
0
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1 10 100
Output Current (mA)
Efficiency (%)
V i n = 1. 1V
Vin = 1.5V
L1: XPL2010-682M
