AS3515_08 datasheet(33/67 Pages) AMSCO

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AS3515 V15

austriamicrosystems

Data Sheet, Confidential

www.austriamicrosystems.com

Revision 3.1

- 66

6.11 Charge-Pump Step-Down Converter

6.11.1 General

This converter will be used to supply the core voltage for a microprocessor.

•

Input Voltage CPVDD

•

Output Voltage 0.85 to 1.8 V

•

Voltage setting via P_CVDD and CVDDp<1:0> bits in 16 steps

•

regulated 2:1 charge pump with pulse skipping

•

scaleable switches according to BVDD

•

Bypass LDO for higher currents or lower battery voltages respectively

•

Driver strength: 50mA / 200mA with bypass LDO

Figure 13 Charge Pump Block Diagram

Mode_1

VBAT Length Reg.

Mode_2

CPVDD Length Reg.

Mode_3

ChPump Length Reg.

Charge-Pump

With ext. C-Fly

500kHz

2u2F

330nF

LDO4

3.56V

clamp

CVDD

CPVDD

BVDD

VB1V

2u2F

CVDD Regulator

6.11.2 Functional Description

To reduce the power consumption when using CVDDs below 1.8V, CPVDD is automatically set to 3.3V and can be further reduced to

3.1V if needed.

Table 32 CVDD programming

CPVDD

P_CVDD

CVDD

CPVDDp=0 CPVDDp=1

VSS

OFF

3.3V

3.1V

150k to VSS

1.0V

3.3V

3.1V

Open

1.2V

3.3V

3.1V

150k to DVDD

1.5V

3.3V

3.1V

DVDD

1.8V

3.56V

Additional the CVDD voltage can be trimmed with two register bits in the range of 0mV to -150mV

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