AS3515_08 datasheet(30/67 Pages) AMSCO

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AS3515 V15

austriamicrosystems

Data Sheet, Confidential

www.austriamicrosystems.com

Revision 3.1

- 66

6.10 Low Drop Out Regulators

6.10.1 General

These LDO’s are designed to supply sensitive analogue circuits, audio devices, AD and DA converters, micro-controller and other

peripheral devices.

The design is optimised to deliver the best compromise between quiescent current and regulator performance for battery powered

devices.

Stability is guaranteed with ceramic output capacitors of 1μF +/-20% (X5R) or 2.2μF +100/-50% (Z5U). The low ESR of these caps

ensures low output impedance at high frequencies. Regulation performance is excellent even under low dropout conditions, when the

power transistor has to operate in linear mode. Power supply rejection is high enough to suppress high ripple on the battery at the output.

The low noise performance allows direct connection of noise sensitive circuits without additional filtering networks. The low impedance of

the power device enables the device to deliver up to 150mA even at nearly discharged batteries without any decrease of performance.

Figure 11 LDO Block Diagram

Vref

1.8V

Low Noise

DC reference

High Gain

Low Bandwidth

Amplifier

Low Gain

Ultra High Bandwidth

Amplifier

PMOS

Power Device

Ω max.

VBAT

3V-5.5V

Vout

1.85-3.4V

150mA Load

μF

Z5U

external

GND

C_comp

(internal)

Vout

1.7 - 3.56V

200mA load

BVDD

3-5.5V

6.10.2 LDO1

This LDO generates the analog supply voltage used for the AS3515 itself.

•

Input voltage is BVDD

•

Output voltage is AVDD (typ. 2.9V)

6.10.3 LDO2

This LDO generates the digital supply voltage used for the AS3515 itself, microprocessor peripheral supply and external components like

SD-Cards, Nand-Flashes, FM-Radio…

•

Input Voltage is BVDD

•

Output Voltage is DVDD (typ. 2.9V)

•

Driver strength: 200mA

6.10.4 LDO3

This LDO will be used to supply the periphery voltage for a microprocessor.

•

Input Voltage BVDD

•

Output Voltage is PVDD 1.7 to 3.3V

•

Driver strength: 200mA

•

Programmable via P_PVDD pin and PVDDp bit in 8 steps

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