Product Overview:

This IC is a secondary step buck DC-DC controller with a built-in Power Good function, developed using CMOS process technology.

Users can select between PWM control (S-19952 series) and PWM/PFM switching control (S-19953 series) via an option.

The S-19952 series is fixed to PWM control and can be used without interfering with the AM radio band.

The S-19953 series operates in PWM mode under heavy loads and automatically switches to PFM mode under light loads. This PWM/PFM switching control enables high-efficiency operation tailored to the device’s operating conditions.

This IC is housed in a compact package, and the application circuit can be constructed with a minimum of one inductor and two capacitors. With an oscillation frequency of up to 2.25 MHz and miniaturized external components, it is suitable for space-saving applications.

Features

Input Voltage: 2.7 V to 5.5 V

Output Voltage: 0.8 V to 3.3 V

Output Current: 600 mA

VOUT Terminal Voltage Accuracy: ±1.5% (Tj = −40°C to +125°C)

Efficiency: 95%

Oscillation Frequency: 2.25 MHz (typical)

Overcurrent Protection: 1.1 A (typical) (pulse-by-pulse mode)

Thermal shutdown: 170°C (typical) (detection temperature)

Short-circuit protection: Hiccup control, Latch control

100% duty cycle operation

Output discharge function: Selectable “Enabled” / “Disabled”

Power Good function: N-channel open-drain output

Soft-start function: 0.35 ms (typical)

Undervoltage lockout (UVLO): 2.43 V (typical) (detection voltage)

Input and output capacitors: Ceramic capacitors can be used

Operating temperature range: Ta = −40°C to +125°C

Lead-free (100% Sn), halogen-free

Compliant with AEC-Q100*1

*1. Please contact our sales department for details.

Applications:

Secondary power supplies for automotive equipment

Camera modules

Automotive applications (engine, transmission, suspension, ABS, EV/HEV/PHEV-related equipment, etc.)

Regulated power supplies for automotive equipment