PM8903 datasheet(6/34 Pages) STMICROELECTRONICS

6 / 34 page

Pin description and connection diagrams

PM8903

6/34

Doc ID 022748 Rev 1

PSKIP / MS

Pulse-skip and master/slave definition.

Connect with a resistor to GND or leave it floating to define:

Pulse-skip feature status;

Master/slave for synchronization;

Switching frequency.

See

Section 5.8 on page 18.

9COMP

Error amplifier output.

Connect with an (RF - CF) // CP to FB. See Figure 1

The device cannot be disabled by pulling low this pin.

Error amplifier inverting input.

Connect with RFB or RFB // (RS - CS) to VSEN and with an (RF - CF) // CP to

COMP. A resistor ROS to GND sets the output voltage ratio. See Figure 1

GND

All the internal references are referred to this pin. Connect to the PCB Signal

Ground.

VCC

Device power supply.

Operative voltage is 2.9 V - 5.5 V. Filter with at least 1

μF MLCC vs. GND.

13, 14

VIN

Power input voltage, connected to embedded high-side drain.

Supply range is from 2.8 V to 6 V. Bypass VIN pins to PGND pins close to the

IC package with high quality MLCC capacitors (at least 10

μF). See Figure 1.

15, 16

PGND

Power ground connection, connected to embedded low-side MOSFET source.

Connect to PGND PCB plane. See

Figure 1.

Thermal pad

Thermal pad connects the silicon substrate and makes good thermal contact

with the PCB. Connect to the PCB PGND plane.

Table 2.

Pin description (continued)

Pin#

Name

Function

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