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AS1323
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
Figure 21. Typical Application
10μH
1
VBATT
5
LX
10 μ F
3
SHDNN
AS1323
2
VSS
4
VOUT
10 μ F
9.1 Inductor Selection
The control scheme of the AS1323 allows for a wide range if inductor values. A 10μH inductor should be sufficient for most applications (see
Smaller inductance values typically offer smaller physical size for a given series resistance, allowing the smallest overall circuit dimensions.
Applications using larger inductance values may startup at lower battery voltages, provide higher efficiency and exhibit less ripple, but they may
reduce the maximum output current. This occurs when the inductance is sufficiently large to prevent the maximum current limit (I LIMIT ) from
being reached before the maximum on-time (t ON ) expires (see Electrical Characteristics on page 4) .
For maximum output current, the inductor value should be chosen such that the controller reaches the current-limit before the maximum on-time
is triggered:
L > --------------------------------
V BATT ? t ON
I LIMIT
(EQ 1)
t ONMAX is 6μs (typ)
I LIMIT is 400mA (typ)
For larger inductor values, the peak inductor current (I PEAK ) can be determined by:
The inductor ’s incremental saturation current rating should be greater than the peak switching current. However, it is generally advisable to bias
I OUTMAX = --- ? I PEAK ? ? ? ? ? ? η
V BATT -
1
V BATT ? t ON
I PEAK = --------------------------------
L
the inductor into saturation by as much as 20%, although this will slightly reduce efficiency.
9.2 Maximum Output Current
The maximum output current (I OUTMAX ) is a function of I PEAK , V IN , V OUT , and the overall efficiency ( η ) as indicated in the formula for
determining I OUTMAX :
----------------
2 V OUT
(EQ 2)
(EQ 3)
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