AS1326
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 19. Typical AS1326A Application Circuit
V IN = 2.4V
33μF
+
3.3μH
8
LX
10
ONN
6
CLK/SEL
1
ISET
2
AS1326A
9
POUT
10 Ω
100μF
+
V OUT = 3.3V
800mA
REF
5
10nF
4
FB
OUT
330nF
3
GND
7
PGND
Setting the Output Voltages
For a fixed 3.3V output, connect pin FB to GND. To set adjustable output voltages between 2.5 and 5.0V, connect a
resistor voltage-divider to pin FB from pin OUT to GND ( Figure 20 ).
Figure 20. Application Circuit using External Feedback Resistors
V IN = 2.4V
33μF
+
3.3μH
8
LX
10
ONN
6
CLK/SEL
1
ISET
AS1326A
9
POUT
5
10 Ω
100μF
+
V OUT
2
OUT
10nF
REF
4
R 1
330nF
3
FB
R 2
GND
7
PGND
For the circuit shown in Figure 20 , the input bias current into FB is <20nA, permitting large-value resistor-divider net-
works while maintaining accuracy. Place the resistor-divider network as close to the device as possible. Use a ≤ 270k Ω
resistor for R 2 , then calculate R 1 as:
R 1 = R 2 ? ? -------------- – 1 ?
Where:
V FB (the boost-regulator feedback set point) is 1.24V.
V OUT
? V FB ?
(EQ 1)
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