AS3689 datasheet(15/72 Pages) AMSOSRAM

15 / 72 page

AS3689

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (mlg, ptr)

Revision 1.0.2 / 20070115

13 - 70

Where:

Ustepup_out = Step Up DC/DC Converter output voltage.

R3 = Feedback resistor R3.

R4 = Feedback resistor R4.

IDCDC_FB = Tuning current at pin 29 (DCDC_FB); 0 to 31µA.

Table

7 – Voltage Feedback Example Values

Ivtuning

Ustepup_out

µ A

R3 = 1MΩ, R4 not used

R3 = 500kΩ, R4 = 50kΩ

13.75

14.25

14.75

15.25

15.75

6.25

16.25

7.25

16.75

8.25

17.25

9.25

17.75

10.25

18.25

11.25

18.75

12.25

19.25

13.25

19.75

14.25

20.25

15.25

20.75

16.25

21.25

…

31.25

28.75

32.25

29.25

Caution:

The voltage on CURR1, CURR2 and CURR6 must not exceed 15V – see also section ‘High

Voltage Current Sinks’.

7.2.4 PCB Layout Tips

To ensure good EMC performance of the DCDC converter, keep its external power components C2, R2, L1, Q1,

D1 and C9 close together. Connect the ground of C2, Q1 and C9 locally together and connect this path with a

single via to the main ground plane. This ensures that local high-frequency currents will not flow to the battery.

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