Features

• Input voltage range VIN from 2.4 V to 5.5V

• Constant on time (COT) Control for fast

transient

• DCM mode operation

• 1% Vout accuracy

• Output current up to 3A

• Power good output

• 4MHz switching frequency

• Overcurrent and short circuit protection

• Low Rcson: 26 mΩ for both high side and low

side

• Output discharge function

• Small 1.2 x 0.8mm WLCSP package

Applications

• Optical modules

• Smart phones

• Wearable electronics

• Camera modules

• Industrial IoT (smart sensors) / NB-IoT

Description

The RS53203/04/05 are a family of small size, high

efficiency step-down converters optimized for high

density application. The device can operate at

switching frequency up to 4MHz to reduce the size

of external components.

The device employes PFM/PWM mode operation.

At PFM/PWM mode, the device transits between

PFM and PWM mode automatically to save power

at light load condition. At forced PWM mode, the

device operates at 4MHz switching frequency.

With 4 selectable output voltage options, the device

requires minimum number of external components

for output voltage setting.

The input voltage of RS53203/04/05 is from 2.4V to

5.5V. The output current is up to 3A.

RS53203/04/05 are available in a 0.8mm x 1.2 mm,

6-pin WLCSP package.