AS3722 datasheet(43/199 Pages) AMSOSRAM

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[v1-01] 2015-Sep-07

AS3722 − Detailed Descriptions- Power Management Functions

Figure 39:

Extended Input Range LDO Block Diagram

Figure 40:

Tracking LDO3 Block Diagram

LDO3 can operate in three different modes (ldo3_mode). As

normal PMOS LDO for high intput votlages operating from

VIN_LDO3_4, as NMOS LDO on lower input voltages (<1.7V)

from VIN_LDO3_LV or as switch between VIN_LDO3_SW and

LDO3.

LDO3 has a special tracking function to follow SD1 or SD6

(selectable in OTP) output voltage as long as the DCDC is

enabled, if it is disabled the LDO operates in normal PMOS

mode. With ldo3_vtrack_tr an offset can be programmed for the

PMOS tracking to compensate voltage drops along the supply

lines.

Extended Input Range LDO Block

Diagram: Shows the internal structure

of the NMOS linear regulator.

Tracking LDO3 Block Diagram: Shows

the internal structure of the LDO3 linear

regulator consisting of a PMOS and a

NMOS LDO as well as a switch.

NMOS

Power

Device

0.6?

VIN_LDOx

Error

Amplifier

LDOx

VSS

Vref

0.8V

low noise

CLOAD_LDOx

VSUP

2.2uF

LDO3

PMOS

0.6-1.5V

300mA

1.7V input

LDO3

NMOS

0.6-1.0V

100mA

LDO3

350mOhm

2.2uF

(1.2-3.3V)

(1.7-5.5V)

(0.6-1.5V)

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