STw4141

STw4141 pinout

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B4

VOUT2

Output voltage 2

C4

GND

Signal ground

D4

EN

Enable Input:

EN = Low - Device in shutdown mode,

EN = High - Enable device

This pin must be connected either to VDD or GND.

Table 1.

STw4141 pin description (continued)

Pin

Symbol

Description

PGND pin

This is the ground pin related to power signal. This pin should be connected to the board ground

plane by short and wide track or multiply vias to reduce impedance and EMI.

GND pins

This is the ground pin related to analog signal.

PVDD pin

This pin is designed to provide power to the device. This path leads high currents. It should be

wide and short to minimize track impedance to reduce losses and EMI.

VDD pin

This pin is designed to provide signal supply voltage to the device. There is no specific

requirement for its related track design.

VLX1/VLX2 pins External coil is connected on those pins. It should be placed as closed as possible to the device

in order minimize resistances which cause looses. These paths lead high currents.

VOUT1 pin3

It is the first output voltage of this device. This path leads high currents. It should be wide and

short to minimize track impedance to reduce losses and EMI.

VOUT2 pin

It is the second output voltage of this device. This path leads high currents. It should be wide and

short to minimize track impedance to reduce losses and EMI.

FB1 pin

Intended to measure VOUT1 voltage in order to ensure the regulation of this output.

FB2 pin

Intended to measure VOUT2 voltage in order to ensure the regulation of this output.

ENABLE pin

This is the enable pin of the device. Pulling this pin to ground, forces the device into shutdown

mode. Pulling this pin to VDD enables the device. This pin must be terminated.

MODE/SYNC pin The MODE/SYNC pin is a multipurpose pin which provides mode selection and frequency

synchronization.

The device can also be synchronized to an external clock signal from 600 kHz to 1.5 MHz by the

MODE/SYNC pin. During synchronization, the mode is forced to PWM mode and the top switch

turn-on is synchronized to the rising edge of the external clock.

AUTO pin

This pin allows the device to automatically switch from PWM to PFM mode following load on both

2 outputs.

STATE pin

This output pin informs user in which state the device is working: PWM or PFM mode.

VSEL pin

consumption when entering into sleep mode.