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EN2360QI Datasheet(PDF) 16 Page - Enpirion, Inc.

Part # EN2360QI
Description  6A Voltage Mode Synchronous Buck PWM DC-DC Converter with Integrated Inductor
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Manufacturer  ENPIRION [Enpirion, Inc.]
Direct Link  http://www.enpirion.com
Logo ENPIRION - Enpirion, Inc.

EN2360QI Datasheet(HTML) 16 Page - Enpirion, Inc.

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07514
September 17, 2012
Rev: A
EN2360QI
©Enpirion 2012 all rights reserved, E&OE
Enpirion Confidential
www.enpirion.com, Page 16
Thermal Overload Protection
Thermal shutdown circuit will disable device
operation when the junction temperature exceeds
approximately 150ºC. After a thermal shutdown
event, when the junction temperature drops by
approx 20ºC, the converter will re-start with a
normal soft-start.
Input Under-Voltage Lock-Out (UVLO)
Internal circuits ensure that the converter will not
start switching until the input voltage is above the
specified minimum voltage. Hysteresis, input de-
glitch and output leading edge blanking ensures
high noise immunity and prevents false UVLO
triggers.
Application Information
Output Voltage Programming and Loop
Compensation
The EN2360QI uses a Type IV Voltage Mode
compensation network. Type IV Voltage Mode
control is a proprietary Enpirion control scheme that
maximizes control loop bandwidth to deliver
excellent load transient responses and maintain
output regulation with pin point accuracy. For ease
of use, most of this network has been customized
and is integrated within the device package. The
EN2360QI output voltage is programmed using a
simple resistor divider network (RA and RB). The
feedback voltage at VFB is nominally 0.6V. RA is
predetermined based on Table 5 and RB can be
calculated based on Figure 10. The values
recommended for COUT, CA, RCA and REA make up
the external compensation of the EN2360QI. It will
vary with each PVIN and VOUT combination to
optimize on performance. The EN2360QI solution
can be optimized for either smallest size or highest
performance. Please see Table 5 for a list of
recommended RA, CA, RCA, REA and COUT values for
each solution.
Figure 8: VOUT Resistor Divider & Compensation
Components. See Table 5 for details.
Input Capacitor Selection
The EN2360QI requires a 22µF/1206 input
capacitor. Low-cost, low-ESR ceramic capacitors
should be used as input capacitors for this
converter. The dielectric must be X5R or X7R
rated. Y5V or equivalent dielectric formulations
must not be used as these lose too much
capacitance with frequency, temperature and
bias voltage. In some applications, lower value
capacitors are needed in parallel with the larger,
capacitors in order to provide high frequency
decoupling.
Table
3
contains
a
list
of
recommended input capacitors.
Recommended Input Capacitors
Description
MFG
P/N
22µF, 16V,
X5R, 10%,
1206
Murata
GRM31CR61C226ME15
22µF, 16V,
X5R, 20%,
1206
Taiyo Yuden
EMK316ABJ226ML-T
Table 3: Recommended Input Capacitors
Output Capacitor Selection
As seen from Table 5, the EN2360QI has been
optimized for use with one 100µF/1206 plus two
47µF/1206 output capacitors for best performance.
For the smallest solution size configuration see
Table 5. Low ESR ceramic capacitors are required
with X5R or X7R rated dielectric formulation. Y5V
or equivalent dielectric formulations must not
be used as these lose too much capacitance
with frequency, temperature and bias voltage.
Table 4 contains a list of recommended output
capacitors
Output ripple voltage is determined by the
aggregate output capacitor impedance. Capacitor
impedance, denoted as Z, is comprised of
capacitive reactance, effective series resistance,
ESR, and effective series inductance, ESL
reactance.
Placing output capacitors in parallel reduces the
impedance and will hence result in lower ripple
voltage.


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