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AS3658F-BCTP Datasheet(PDF) 18 Page - ams AG

Part # AS3658F-BCTP
Description  Power and Audio Management Unit for Portable Devices
PDF  158 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3658F-BCTP Datasheet(HTML) 18 Page - ams AG

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Revision 1v13
17 - 157
AS3658
Data Sheet Confidential - Detail ed Descri ption-Power Management Functions
The DC/DC Step Up converter is a high efficiency current mode PWM regulator, which provides an output voltage
dependent on the maximum VDS voltage of the external transistor, and maximum load current selectable by the
external shunt resistor.
For Example:
5V,500mA @ 1.1Mhz
25V,50mA @ 1.1MHz
40V,20mA @ 550kHz
A constant switching frequency results in a low noise on supply and output voltage.
8.1.1 Feedback selection
For step up DCDC 1, the feedback is always DCDC_FB1.
For step up DCDC 2 following feedback selections are possible:
Stpup2_fb selects the type of feedback for the DCDC_step_up2 converter:
DCDC_CURR1, DCDC_CURR2, DCDC_CURR3 or DCDC_FB2 feedback (see Figure 5)
Setting stpup2_fb to 00b enables the feedback on DCDC_FB2, stpup2_fb to 01b enables feedback at pin
DCDC_CURR1, setting step_up_fb to 10b enables feedback at pin DCDC_CURR2 and setting step_up_fb to 11b
enables feedback at pin DCDC_CURR3. The Step-up converter is regulated such that the required current at the
feedback path can be supported.
Always choose the path with the higher voltage drop as feedback to guarantee adequate supply for the other,
unregulated path.
To protect the DCDC output voltage against overvoltage, if a LED string is broken, set stpup2_prot=1. In this mode the
output voltage will be limited by limiting the DCDC_FB voltage to 1.25V (select the external resistor network to adjust
this limitation voltage).
Cout
Output capacitor
2.2
µF
ceramic,
±20%
L
Inductor
10
µH
Use inductors with small Cparasitic
(<100pF) to get high efficiency
tMIN_ON
Minimum on time
130
ns
MDC
Maximum duty cycle
91
%
Table 5. DC/DC Converter parameters
Symbol
Parameter
Min
Typ
Max
Unit
Note



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