EC3228
EC3228 is High-Performance PWM Controller manufactured by E-CMOS.
High-Performance PWM Controller
General Description
Features
The EC3228 is a single-phase, constant-on-time,
- synchronous PWM controller, which drives N-channel
- MOSFETs. The EC3228 steps down high voltage to
- generate low-voltage chipset or RAM supplies in notebook
- puters.
The EC3228 provides excellent transient response and
- accurate DC voltage output in either PFM or PWM Mode. In
- Pulse Frequency Mode (PFM), the EC3228 provides very
- high efficiency over light to heavy loads with loading-
- modulated switching frequencies. In PWM Mode, the
- converter works nearly at constant frequency for low-noise
- requirements.
- The EC3228 is equipped with accurate positive current-
- limit, output under-voltage, and output over-voltage protections, perfect for NB applications. The Power-On-
- Reset function monitors the voltage on VCC to prevent
- wrong operation during power-on. The EC3228 has a 1ms
- digital soft-start and built-in an integrated output
- discharge method for soft-stop. An internal integrated
- soft-start ramps 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 EC3228 is available in 10pin TDFN 3x3 package.
Adjustable Output Voltage from +0.7V to +5.5V 0.7V Reference Voltage ±1% Accuracy Over-Temperature Operates from an Input Battery Voltage Range of +1.8V to +32V Power-On-Reset Monitoring on VCC Pin Excellent Line and Load Transient Responses PFM Mode for Increased Light Load Efficiency Selectable PWM Frequency from 4 Preset Values Integrated MOSFET Drivers Integrated Bootstrap Forward P-CH MOSFET Adjustable Integrated Soft-Start and Soft-Stop Selectable Forced PWM or Automatic PFM/PWM Mode Power Good Monitoring 70% Under-Voltage Protection 125% Over-Voltage Protection Adjustable Current-Limit Protection Using Sense Low-Side MOSFET’s RDS(ON) Over-Temperature...
