PM6641 datasheet(7/47 Pages) STMICROELECTRONICS

7 / 47 page

PM6641

Pin settings

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SS_1S5

Positive terminal of the external Soft-Start Capacitor for 1.5 V rail.

See Chapter 7.6: Outputs Soft-Start on page 28 section for details.

COMP_1S5

Loop Compensation Output for 1.5 V rail. Chapter 7.3: SW regulators

control loop on page 24 and Chapter 8.4: SW regulator compensation

components selection on page 38 sections for details.

VFB_1S5

Feedback Input for 1.5 V rail.

See Chapter 7.5: Output voltage divider on page 27 section for details

SGND_1S5

Switcher power ground for 1.5 V rail.

SGND_1S5

Switcher power ground for 1.5 V rail.

VSW_1S5

Switch node for 1.5 V rail.

VSW_1S5

Switch node for 1.5 V rail.

VIN_1S5

Power supply input for 1.5 V rail.

EN_1S05

Enable input for 1.05 V rail.

EN_1S5

Enable input for 1.5 V rail.

EN_VTT

Enable Input for VTT rail. High in S0 System States. See Chapter 7.1.4: S3

and S5 power management pins on page 22 section for details.

EN_1S8

Enable Input for 1.8 V (VDDQ) rail. High in S0-S3 System States.

See Chapter 7.1.4: S3 and S5 power management pins on page 22 section

for details.

AGND

Analog and Signal Ground.

SET_PH1

Switching Regulator Phase Control.

See Chapter 7.9: Phase management on page 30 section for details.

AGND

Analog and Signal Ground.

AVCC

Analog Circuitry Supply. Connect to +5 V by a simple RC filter.

VTTGND

LDO Linear Regulator Power Ground.

VTT

LDO Linear Regulator Output. DDR2-3 Termination Voltage. See

Chapter 7.1: Memory supply on page 20 and Chapter 7.1.2: VTT LDO and

VTTREF buffered reference on page 21 sections for details.

LDOIN

LDO Linear Regulator Input. Typically connected to the 1.8 V rail.

VTTREF

Reference Voltage Buffer Output. See Chapter 7.1: Memory supply on

page 20 and Chapter 7.1.2: VTT LDO and VTTREF buffered reference on

page 21 sections for details.

DSCG

Tracking/Non-tracking Discharge Selection for DDR2-3 Section. See

Chapter 7.7: Outputs Soft-End on page 29 section for details.

VTTFB

Feedback Input for VTT Linear Regulator Output.

VCC

+5 V Switching Circuitry Supply. Bypass to AGND by a 100 nF capacitor.

Table 2. Pin functions (continued)

N°

Function

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