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AS1330

4MHz, Low Voltage, DC-DC Step-Up Converter

austriamicrosystems AG 

AS1330

Datasheet - Application Information

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

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

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

(EQ 1)

a Sense Function

v 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).

ill - 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).

t - 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

G s threshold voltage can be set with the following equation:

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

(EQ 2)

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

m te L1

1µH

a on AA Battery

c Vthreshold

1.2V

C1

4.7µF

SW

VIN

AS1330-3.0

l On

a RIN1

Off

320kΩ

ic RIN2

Techn 680kΩ

EN

SENSE

GND

VOUT

POK

FB

C2

4.7µF

VOUT

3.0V

www.austriamicrosystems.com/DC-DC_Step-Up/AS1330

Revision 1.06

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