AS1331 datasheet(13/17 Pages) AMSCO

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AS1331

Datasheet - D e t a i l e d D e s c r i p t i o n

Output Voltage Selection

The AS1331 is available in two versions (see Ordering Information on page 15). One version can only operate at one

fixed output voltage (see Figure 25) and the other version can operate with user-adjustable output voltages from 2.5V

to 3.3V by connecting a voltage divider between the pins

VOUT and FB (see Figure 24).

Figure 24. LiIon to Adjustable Output Voltage

The output voltage can be adjusted by selecting different values for R1 and R2.

Calculate VOUT by:

Where:

VFB = 1.25V, VOUT = 2.5V to 3.3V;

R2 (the predefined resistor in the resistor devider) should be

≤ 270kΩ.

R3 (the Pull-up resistor for the LBO pin) should be ~100k

Ω.

Figure 25. LiIon to 3.3V with POK - Fixed Output Voltage

LiIon Battery

AS1331-AD

22µF

Off

10µF

PGND

SW2

VOUT

2.5V to 3.3V

VIN

VOUT

SW1

6.8µH

LBO

LBI

GND

(EQ 2)

OUT

------

⎝⎠

⎛⎞

LiIon Battery

AS1331-

3.3V

22µF

Off

10µF

PGND

SW2

VOUT

3.3V

300mA

VIN

VOUT

SW1

6.8µH

LBO

LBI

GND

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