EC3228 Datasheet, PDF (1/16 Pages) E-CMOS Corporation – High-Performance PWM Controller

High-Performance PWM Controller
EC3228
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 
computers.
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 R_DS(ON)
Over-Temperature Protection
TDFN-10 3x3 Package
Lead Free and Green Devices Available
(RoHS Compliant)
Applications
 Notebook
 Table PC
 Hand-Held Portable
 AIO PC
 LCD Monitor / TV
 Battery Charger
 ADSL Modem
 Telecom / Networking Equipment
E-CMOS Corp. (www.ecmos.com.tw)
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3G15N-Rev.P002