參數(shù)資料
型號： AS1326A-BTDT
廠商： AUSTRIAMICROSYSTEMS AG
元件分類： DC/DC變換器
英文描述： Adj. 650mA, 1MHz, Boost
中文描述： 高電流0.8A的DC - DC升壓轉(zhuǎn)換器
文件頁數(shù)： 13/18頁
文件大?。?/td> 1108K
代理商： AS1326A-BTDT
www.austriamicrosystems.com
Revision 1.05
13 - 18
AS1326
Datasheet - Application Information
Inductor Selection
The AS1326A/AS1326B high switching-frequency allows the use of a small 3.3μH surface-mount inductor. The induc-
tor should generally have a saturation current rating exceeding the N-channel switch current limit; however, it is
acceptable to bias the inductor current into saturation by as much as 20% if a slight reduction in efficiency is accept-
able.
Lower current-rated inductors may be used if ISET is used to reduce the peak inductor current
(see Setting the Switch
Current Limit on page 12)
. For high efficiency, select an inductor with a high-frequency ferrite core material to reduce
core losses. To minimize radiated noise, use a toroid or shielded inductor. Connect the inductor from the battery to the
pin LX as close to the device as possible.
Figure 23. Efficiency vs. I
OUT
; V
IN
= 2V, V
OUT
= 3.3V
96
Figure 24. Efficiency vs. I
OUT
; V
IN
= 3V, V
OUT
= 5V
96
External Schottky Diode
For output voltages greater than 4V, an external Schottky diode must be connected between pin LX and POUT, in par-
allel with the integrated synchronous rectifier
(see Figure 25)
. The diode should be rated for 0.5A. An external diode is
also recommended for applications that must start with input voltages at or below 1.8V. The Schottky diode carries cur-
rent during startup and after the synchronous rectifier turns off; thus, its current rating only needs to be 500mA.
Note:
Connect the diode as close to the IC as possible.
For circuits that do not require startup with inputs below 1.8V and have an output of 4V or less, the external
diode is not needed.
Caution:
Do not use ordinary rectifier diodes as their slow switching speeds and long reverse-recovery times render
them unacceptable.
Table 7. Recommended Inductors
Part Number
MOS6020-332
LPS4018-332
DO1608C-272
L
DCR
46m
Ω
80m
Ω
80m
Ω
Current Rating Dimensions (L/W/T)
1.8A
2.0A
2.1A
6.6x4.45x2.92mm
Manufacturer
Coilcraft
3.3μH
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