AS1330 datasheet(11/18 Pages) AMSCO

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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

The integrated error amplifier is an internally compensated trans-conductance (gm) type (current output). The internal 0.8V reference voltage is

compared to the voltage at pin FB to generate an error signal at the output of the error amplifier. A voltage divider from VOUT to GND programs

the output voltage from 1.8 to 3.0V via pin FB as:

VOUT = 0.8V(1 + (R1/R2))

(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 GND: The POK is related to VOUT (see Figure 22 on page 11).

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

POK goes high when the voltage on SENSE is above 0.8V and low when the voltage on 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:

Vthreshold = 0.8V(1 + (RIN1/RIN2))

(EQ 2)

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

AA Battery

AS1330-3.0

4.7µF

Off

1µH

4.7µF

VOUT

3.0V

VIN

VOUT

SENSE

POK

GND

RIN1

320k

Ω

RIN2

680k

Ω

Vthreshold

1.2V

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