AS1330 austriamicrosystems, AS1330 Datasheet - Page 10

• Manufacturer Part Number: AS1330
• Description: 4mhz, Low Voltage, Dc-dc Step-up Converter
• Manufacturer: austriamicrosystems

AS1330
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
The AS1330 is ideal for space critical applications where ultra-small size is critical as in medical diagnostic equipment,
hand-held instruments, digital cameras, MP3 players, GPS receivers, and PC or Memory cards.
Along with
which the AS1330 converters are perfectly suited.
Adjustable Output Voltage
The integrated error amplifier is an internally compensated trans-conductance (g
0.8V reference voltage is compared to the voltage at pin FB to generate an error signal at the output of the error ampli-
fier. A voltage divider from V
Sense Function
The AS1330 offers a sense function for monitoring a voltage (e.g.: the battery voltage). The sense function can work in
three different modes:
Figure 20. AS1330 - Boost Converter, Single AA Cell to 3.0V fixed Output Voltage
www.austriamicrosystems.com/DC-DC_Step-Up/AS1330
- SENSE to GND: The POK is related to V
- SENSE to VIN: If the pin SENSE is directly connected to pin VIN, the internal reference voltage (0.8V) is used to
- SENSE to a voltage divider: With the voltage divider the threshold voltage on which the POK reacts can be set. If
compare it with V
SENSE is below 0.8V
the monitored voltage is higher then the user set threshold voltage the POK is high, when the monitored voltage
is lower the POK goes low
AA Battery
Vthreshold
Figure 1 on page
320kΩ
1.2V
680kΩ
RIN1
RIN2
IN
. The POK goes high when the voltage on SENSE is above 0.8V and low when the voltage on
On
Off
4.7µF
(see Figure 21 on page
OUT
1,
C1
Figure
to GND programs the output voltage from 1.8 to 3.0V via pin FB as:
(see Figure
20,
Vthreshold = 0.8V(1 + (R
VIN
EN
Figure 21
1µH
V
L1
OUT
20). The threshold voltage can be set with the following equation:
OUT
AS1330-3.0
= 0.8V(1 + (R
SENSE
(see Figure 22 on page
and
11).
SW
Revision 1.04
Figure 22 on page
GND
1
/R
IN1
2
/R
))
IN2
))
VOUT
POK
FB
11).
11depict a few of the many applications for
m
) type (current output). The internal
4.7µF
C2
V
3.0V
OUT
(EQ 1)
(EQ 2)
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