C11 datasheet(14/72 Pages) AMSOSRAM

14 / 72 page

AS3688

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (ptr,tje)

Revision 1.1.1 / 20060707

12 - 70

7.2

Step Up DC/DC Converter

The DCDC step up converter is only available in the AS3688 version (not available for the AS3688B – marking

‘AS3688B’).

The Step Up DC/DC Converter is a high-efficiency current mode PWM regulator, providing output voltage up to

25V and a load current up to 50mA. A constant switching-frequency results in a low noise on the supply and

output voltages.

Figure

10 – Step Up DCDC Converter Block Diagrammö Option: Current Feedback with Overvoltage protection

TBD: Final Datasheet: Add internal logic with overvoltage detection.

Step Up DC/DC

Converter

4.7µF

C10

1.5nF

SENSE_N

DCDC_GATE

DCDC_FB

1µF

Battery

10µH

D10

D12

D11

White LEDs,

Backlight

CURR1

CURR2

Current Sinks

each 0.625-40mA

C11

15nF

100k

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