General Description

The APW7190 is a single-phase, constant-on-time, synchronous PWM controller, which drives N-channel MOS FETs. The APW7190 allows wide input voltage that is either a single 5~12V or two supply voltage(s) for various applications. An internal 0.5V temperature-compensated reference voltage with high accuracy is designed to meet the requirement of low output voltage applications.

The PWM controller operates fixed 300kHz pseudo-constant frequency PWM with an adaptive constant-on-time control. The device provides excellent transient response and accurate DC voltage output in either PFM or PWM Mode. In Pulse Frequency Mode (PFM), the APW7190 provides very high efficiency over light to heavy loads with loading-modulated switching frequencies. The device works in ultrasonic mode with PFM at no load. The unique ultrasonic mode maintains the switching frequency above 20kHz, which eliminates noise in audio applications.

The APW7190 is equipped with accurate current-limit, output under-voltage, and output over-voltage protections. A Power-On-Reset function monitors the voltage on VCC to prevent wrong operation during power-on. The APW7190 has a 4ms digital soft-start to ramp up the output voltage with programmable slew rate to reduce the start-up current. A soft-stop function actively discharges the output capacitors with controlled reverse inductor current.

The APW7190 is available in TDFN3x3-10 package.

Features

● Operating with Single 5~12V Supply Voltage or Two Supply Voltages

● ±0.6 0.5V Reference

- Over Line, Load Regulation, and Operating Temp.

● Drive Dual Low Cost N-Channel MOSFETs

- Adaptive Shoot-Through Protection

● Power-On-Reset Monitoring on VCC Pin

● High Efficiency at Light Load

● Constant-On-Time Control Scheme

- Switching Frequency Compensation for PWM Operation

● 300kHz Constant Switching Frequency

● Integrated MOSFET Drivers and Bootstrap Diode

● Internal Integrated Soft-Start

● Built-In Ultrasonic Mode Control Scheme with PFM

● Adaptive Dead-Time Control

● Power Good Monitoring

● 70 Under-Voltage Protection

● 125 Pre-Over-Voltage and Over-Voltage Protection

● Adjustable Current-Limit Protection

- Using Low-Side MOSFET’s RDS(ON)

● Over-Temperature Protection

● 3mmx3mm TDFN-10 (TDFN3x3-10) Package

● Lead Free and Green Devices Available (RoHS Compliant)

Applications

● Mother Board

● Low Cost PC

● 5V or 12V-Input DC/DC Regulators