AS3687 datasheet(12/55 Pages) AMSCO

12 / 55 page

AS3687/87XM

Datasheet

www.austriamicrosystems.com/AS3687

1v3-4

11 - 54

R2 = Feedback resistor R2.

R3 = Feedback resistor R3.

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

Table

4 – Voltage Feedback Example Values

Ivtuning

Ustepup_out

µ A

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

Caution:

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

Voltage Current Sinks’.

7.1.4 PCB Layout Hints

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.

7.1.5 Step up Registers

Reg. Control

Addr: 00

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

Bit

Bit Name

Default

Access

Description

step_up_on

R/W

Enable the step up converter

0b = Disable the Step Up DC/DC Converter.

1b = Enable the Step Up DC/DC Converter.

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