PM8903ATR datasheet(6/33 Pages) STMICROELECTRONICS

6 / 33 page

Pin description and connection diagrams

PM8903A

6/33

Doc ID 024147 Rev 1

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

PM8903ATR Datasheet(PDF) 6 Page - STMicroelectronics