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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 Figure 1 on page 1, Figure 20, Figure 21 and Figure 22 on page 11depict a few of the many applications for

which the AS1330 converters are perfectly suited.

Adjustable Output Voltage

0.8V reference voltage is compared to the voltage at pin FB to generate an error signal at the output of the error ampli-

(EQ 1)

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:

- SENSE to VIN: If the pin SENSE is directly connected to pin VIN, the internal reference voltage (0.8V) is used to

SENSE is below 0.8V (see Figure 21 on page 11).

- SENSE to a voltage divider: With the voltage divider the threshold voltage on which the POK reacts can be set. If

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 (see Figure 20). The threshold voltage can be set with the following equation:

(EQ 2)

Figure 20. AS1330 - Boost Converter, Single AA Cell to 3.0V fixed Output Voltage

AA Battery

AS1330-3.0

C2

4.7µF

On

Off

L1

1µH

C1

4.7µF

SW

3.0V

EN

FB

VIN

VOUT

SENSE

POK

GND

RIN1

320k

Ω

RIN2

680k

Ω

Vthreshold

1.2V