ep5352q Enpirion, ep5352q Datasheet - Page 7

• Manufacturer Part Number: ep5352q
• Description: 500/600/800ma Synchronous Buck Regulators With Integrated Inductor
• Manufacturer: Enpirion

March 2007
Detailed Description
Functional Overview
T
converter solution requiring only two low cost
MLCC capacitors. MOSFET switches, PWM
controller,
inductor are integrated into the tiny 5mm x
4mm x 1.1mm package to provide the smallest
footprint
efficiency and high performance. The converter
uses voltage mode control to provide the
simplest
immunity. The device operates at a 4 MHz
switching
frequency allows for a wide control loop
bandwidth
performance. The 4 MHz switching frequency
enables the use of very small components
making possible this unprecedented level of
integration.
E
technology provides very low switching loss at
frequencies of 4 MHz and higher, allowing for
the use of very small internal components, and
very wide control loop bandwidth.
magnetic design allows for integration of the
inductor into the very low profile 1.1mm
package. Integration of the inductor virtually
eliminates the design/layout issues normally
associated
converters.
and faster integration into various applications
to meet demanding EMI requirements.
O
values via a three pin VID voltage select
scheme.
the selection of any voltage in the 0.6 to V
V
components that must be qualified and
reduces inventory problems. The VID pins can
be toggled on the fly to implement glitch free
dynamic voltage scaling.
©Enpirion 2007 all rights reserved, E&OE
he EP53x2Q family is a complete DCDC
npirion’s
dropout
utput voltage is chosen from seven preset
.
This
possible
implementation
An external divider option enables
frequency.
Gate-drive,
proprietary
All of this enables much easier
providing
with
reduces
while
switch-mode
The
compensation,
excellent
power
the
and
maintaining
high
number
high
MOSFET
switching
transient
Unique
DCDC
noise
high
and
IN
of
-
7
Protection features include under-voltage lock-
o
short circuit protection, and thermal overload
protection.
Integrated
Enpirion has introduc
p
The EP53x2Q family utilizes a low loss, planar
construction inductor. The use of an internal
inductor localizes the noises associated with
the output loop currents. The inherent shielding
and compact construction of the integrated
inductor reduces the radiated noise that
couples into the traces of the circuit board.
Further, the package layout is optimized to
reduce the electrical path length for the AC
ripple currents that are a major source of
radiated emissions from DCDC converters.
The integrated inductor significantly reduces
parasitic effects that can harm loop stability,
and makes layout very simple.
Soft Start
Internal soft
w
condition or when the “ENABLE” pin is
asserted “high”. Digital control circuitry limits
the V
the Power MOSFETS and the integrated
inductor. The soft start ramp rate is nominally
3.3mV/µSec.
O
The current limit function is achieved
s
MOSFET which is compared to a reference
current. When this level is exceeded the P-
FET is turned off and the N-FET is turned on,
pulling V
for a period of 1mS and then a normal soft start
is initiated. If the over current condition still
persists, this cycle will repeat in a “hiccup”
mode.
ensing the current flowing through a sense P-
ut (UVLO), over-current protection (OCP),
roduct family featuring integrated inductors.
hen the device starts up from a power down
ver Current/Short Circuit Protection
OUT
OUT
ramp rate to levels that are safe for
Inductor
low. This condition is maintained
start circuits limit in-rush current
EP5382Q/EP5362Q/EP5352Q
ed the world’s first
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