EN2340QI Datasheet, PDF (10/20 Pages) Enpirion, Inc. – 204A Voltage Mode Synchronous Buck PWM

Functional Block Diagram
EN2340QI
Figure 4: Functional Block Diagram
Functional Description
Synchronous Buck Converter
The EN2340QI is a highly integrated synchronous,
buck converter with integrated controller, power
MOSFET switches and integrated inductor. The
nominal input voltage (PVIN) range is 4.5V to 14V
and can support up to 4A of continuous output
current. The output voltage is programmed using
an external resistor divider network. The control
loop utilizes a Type IV Voltage-Mode compensation
network and maximizes on a low-noise PWM
topology. Much of the compensation circuitry is
internal to the device. However, a phase lead
capacitor is required along with the output voltage
feedback resistor divider to complete the Type IV
compensation network.. The high switching
frequency of the EN2340QI enables the use of
small size input and output capacitors, as well as a
wide loop bandwidth within a small foot print.
Protection Features:
The power supply has the following protection
features:
• Programmable Over-Current Protection
• Thermal Shutdown with Hysteresis.
• Under-Voltage Lockout Protection
Additional Features:
• Switching Frequency Synchronization.
• Programmable Soft-Start
• Power OK Output Monitoring
©Enpirion 2012 all rights reserved, E&OE
06878
Enpirion Confidential
April 16, 2012
www.enpirion.com, Page 10
Rev: B