EP5348UI-E Enpirion, EP5348UI-E Datasheet - Page 7

• Manufacturer Part Number: EP5348UI-E
• Description: Power Management Development Tools EP5348UI Eval Board 400mA/5MHz Buck Reg
• Manufacturer: Enpirion
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of EP5348UI-E

• Product: Power Management Development Tools
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: EP5348UI

Detailed Description
Functional Overview
The EP5348UI requires only 2 small MLCC
capacitors and a few small-signal components
for a complete DC-DC converter solution. The
device integrates MOSFET switches, PWM
controller,
compensation, and inductor into a tiny 2.0mm x
1.75mm
Advanced package design, along with the high
level of integration, provides very low output
ripple and noise. The EP5348UI uses voltage
mode control for high noise immunity and load
matching to advanced ≤90nm loads.
external resistor divider is used to program
output setting over the 0.6V to V
specified in the Electrical Characteristics Table.
The EP5348UI provides the industry’s highest
power density of any 400mA DC-DC converter
solution.
The
integration is Enpirion’s proprietary power
MOSFET technology. The advanced MOSFET
switches are implemented in deep-submicron
CMOS to supply very low switching loss at high
switching frequencies and to allow a high level
of integration. The semiconductor process
allows seamless integration of all switching,
control, and compensation circuitry.
The proprietary magnetics design provides
high-density/high-value magnetics in a very
small footprint.
carefully
compensation circuitry yielding an optimal
solution with assured performance over the
entire operating range.
Protection features include under-voltage lock-
out (UVLO), over-current protection (OCP),
short circuit protection, and thermal overload
protection.
Integrated Inductor
The EP5348UI utilizes a proprietary low loss
integrated inductor.
inductor greatly simplifies the power supply
design process. The inherent shielding and
compact construction of the integrated inductor
reduces the noise that can couple into the
©Enpirion 2011 all rights reserved, E&OE
05721
key
x
matched
Gate-drive,
enabler
0.9mm
Enpirion magnetics are
to
The integration of the
of
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loop
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6/15/2011
7
traces of the printed circuit board. Further, the
package layout is optimized to reduce the
electrical path length for the high di/dT currents
that are always present in DC-DC converters.
The integrated inductor provides the optimal
solution to the complexity, output ripple, and
noise that plague low power DC-DC converter
design.
Control Matched to sub 90nm Loads
The EP5348UI utilizes a type III compensation
network.
impedance matched to the sub 90nm process
technology that is used in today’s advanced
ICs. Voltage mode control also provides a high
degree of noise immunity at light load currents
so that low ripple and high accuracy are
maintained over the entire load range.
very high switching frequency allows for a very
wide control loop bandwidth and hence
excellent transient performance.
Soft Start
Internal soft start circuits limit the rate of output
voltage rise when the device starts up from a
power down condition, or when the “ENABLE”
pin is asserted “high”. Digital control circuitry
controls the V
turn-on ramp.
The EP5348UI has a fixed V
Therefore, the ramp rate will vary with the
output voltage setting. Output voltage rise time
is given in the Electrical Characteristics Table.
Excess bulk capacitance on the output of the
device can cause an over-current condition at
startup.
the output, including the output filter capacitor,
and bulk and decoupling capacitance at the
load, is given as:
C
The nominal value for the output filter capacitor
is 10uF. See the applications section for more
details.
Over Current/Short Circuit Protection
The current limit function is achieved by
sensing the current flowing through a sense P-
OUT_TOTAL_MAX
The maximum total capacitance on
Voltage mode control is inherently
OUT
= 9.333 x 10
rise time to ensure a smooth
www.enpirion.com
-4
/ V
OUT
OUT
turn-on time.
EP5348UI
Rev: B
The