AS1335 datasheet(12/19 Pages) AMSCO

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AS1335

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 AS1335 is perfect for mobile communications equipment, LED matrix displays, bar-graph displays, instrument-

panel meters, dot matrix displays, set-top boxes, white goods, professional audio equipment, medical equipment,

industrial controllers to name a few applications.

Adjustable Output Voltage

For the fixed output voltage (VOUT=1.0V) connect pin FB to VOUT (see Figure 19). For the adjustable output voltage

version connect a voltage divider to pin FB (see Figure 20).

The voltage divider from VOUT to GND programs the output voltage from 0.6V to 5.25V via pin FB as:

VOUT = 0.6V(1 + (R1/R2))

(EQ 1)

Figure 19. AS1335 - Step-Down Converter, Single Li-Ion to 1.0V / 1.5A fixed Output

Figure 20. AS1335 - Step-Down Converter, Single Li-Ion to 3.3V adjustable Output

AS1335-100

COUT

100µF

CIN

22µF

VIN

2.7V to 4.2V

VOUT

1.0V, 1.5A

2.2µH

GND

VIN

POK

GND

PGND

RSI

100k

AS1335-AD

COUT

100µF

CIN

22µF

VIN

3.35V to 5.25V

VOUT

3.3V

2.2µH

GND

VIN

POK

GND

PGND

RSI

100k

680k

150k

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