AS1326 Просмотр технического описания (PDF) - austriamicrosystems AG

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AS1326

High Current, 0.8A DC-DC Step-Up Converters

austriamicrosystems AG 

AS1326

Datasheet - Application Information

9 Application Information

Figure 19. Typical AS1326A Application Circuit

VIN = 2.4V

+

33µF

3.3µH

10nF

8

LX

10

ONN

6

CLK/SEL

1

ISET

2

REF

4

FB

3

GND

7

PGND

AS1326A

9

POUT

10Ω

+

100µF

5

OUT

330nF

VOUT = 3.3V

800mA

Setting the Output Voltages

For a fixed 3.3V output, connect pin FB to GND. To set adjustable output voltages between 2.5 and 5.0V, connect a

resistor voltage-divider to pin FB from pin OUT to GND (Figure 20).

Figure 20. Application Circuit using External Feedback Resistors

VIN = 2.4V

+

33µF

3.3µH

10nF

8

LX

10

ONN

6

CLK/SEL

1

ISET

2

REF

AS1326A

3

GND

7

PGND

9

POUT

5

OUT

R1

4

FB

R2

+

100µF

10Ω

330nF

VOUT

For the circuit shown in Figure 20, the input bias current into FB is <20nA, permitting large-value resistor-divider net-

works while maintaining accuracy. Place the resistor-divider network as close to the device as possible. Use a ≤ 270kΩ

resistor for R2, then calculate R1 as:

R1

=

R2

⋅

⎛

⎝

V-----O----U----T-

VFB

–

1⎠⎞

(EQ 1)

Where:

VFB (the boost-regulator feedback set point) is 1.24V.

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Revision 1.05

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