AS3675 datasheet(15/81 Pages) AMSCO

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AS3675

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

IDCDC_FB = Tuning current at ball DCDC_FB; 0 to 31µA

Note: The voltage on CURR1, CURR2 and CURR6 must not exceed 15V (see page 25)

8.2.4

PCB Layout Hints

To ensure good EMC performance of the DCDC converter, keep its external power components C6, R1, L1, Q1, D1

and C9 close together. Connect the ground of C6, R1 and C9 locally together and connect this with a short path to

AS3675 VSS. This ensures that local high-frequency currents will not flow to the battery.

8.2.5

Step up Registers

Table 9. Voltage Feedback Example Values

IDCDC_FB

UStep up_out

µA

R2 = 1M

Ω, R3 not used

R2 = 500k

Ω, R3 = 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

Table 10. Reg. control

Addr: 00

Reg. control

This register enables/disables the Charge Pump and the Step Up DC/DC

Converter.

Bit

Bit Name

Default Access

Description

step_up_on

0R/W

Enable the step up converter

Disable the Step Up DC/DC Converter

Enable the Step Up DC/DC Converter

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