EN5339QI
Functional Block Diagram
Figure 4: Functional Block Diagram
Functional Description
Overview
Stability and Compensation
The EN5339QI utilizes an internal compensation
network that is designed to provide stable operation
over a wide range of operating conditions. The
output compensation circuit may be customized to
improve transient performance or reduce output
voltage ripple with dynamic loads.
The EN5339QI is a highly integrated synchronous
buck converter with an internal inductor utilizing
advanced CMOS technology to provide high
switching frequency, while also maintaining high
efficiency. The EN5339QI is a high power density
device packaged in a tiny 4x6x1.1mm 24-pin QFN
package. Its high switching frequency allows for the
use of very small MLCC input and output filter
capacitors and results in a total solution size as
small as 55mm2.
The EN5339QI buck converter uses Type III
voltage mode control to provide pin-point output
voltage accuracy, high noise immunity, low output
impedance and excellent load transient response.
The EN5339QI features include Power OK, under
voltage lockout (UVLO), over current protection,
short circuit protection, and thermal overload
protection.
Soft-Start
The EN5339QI has an internal soft-start circuit that
controls the ramp of the output voltage. The control
circuitry limits the VOUT ramp rate to levels that are
safe for the Power MOSFETs and the integrated
inductor.
The EN5339QI has a constant startup up time
which is independent of the VOUT setting. The
output rising slew rate is proportional to the output
voltage. The startup time is approximately 1.4ms
from when the ENABLE is first pulled high until
VOUT reaches the regulated voltage level.
Enpirion 2012 all rights reserved, E&OE
www.enpirion.com, Page 11
06903
September 12, 2012
Rev: B
ENPIRION [ ENPIRION, INC. ]
