en5312q Enpirion, en5312q Datasheet - Page 9

• Manufacturer Part Number: en5312q
• Description: 1a Synchronous Buck Regulator With Integrated Inductor
• Manufacturer: Enpirion

March 2007
Figure 4. External Divider.
The output voltage is selected by the following
formula:
R
gain. Then R
V
0.6V to V
dropout voltage including margin).
Dynamically Adjustable Output
The EN5312QI is designed to allow for
dynamic switching between the predefined VID
voltage levels The inter-voltage slew rate is
optimized to prevent excess undershoot or
overshoot
transition. The slew rate is identical to the soft-
start slew rate of 1.65V/mS.
Dynamic transitioning between internal VID
settings and the external divider is not allowed.
Input and Output Capacitors
The input capacitance requirement is 4.7uF.
Enpirion recommends that a low ESR MLCC
capacitor be used. The input capacitor must
use a X5R or X7R or equivalent dielectric
©Enpirion 2007 all rights reserved, E&OE
V
R
V
OUT
OUT
a
b
IN
must be chosen as 200KΩ to maintain loop
=
V
4.7uF
=
can be programmed over the range of
OUT
1
. 0
2 .
603
−
x
IN
10
. 0
V
603
– 0.6V (0.6 is the nominal full load
5
as
b
(
1
V
V
V
is given as:
ENABLE
V
S0
S1
S2
Ω
+
in
Ra
Rb
the
)
GND
output
V
Sense
V
V
out
FB
voltage
Ra
Rb
10µF
levels
V
OUT
9
formulation.
formulations lose capacitance with frequency,
bias, and with temperature, and are not
suitable for switch-mode DC-DC converter
input and output filter applications.
The output capacitance requirement is a
minimum of 10uF.
designed to be stable with up to 60uF of total
output
modification to the compensation network.
Capacitance above the 10uF minimum should
be added if the transient performance is not
sufficient
recommends a low ESR MLCC type capacitor
be used.
The output capacitor must use a X5R or X7R
or equivalent dielectric formulation.
equivalent
capacitance
temperature and are not suitable for switch-
mode DC-DC converter input and output filter
applications.
Cin
Murata
Panasonic
Taiyo Yuden
Cout
Manufacturer
Manufacturer
Taiyo Yuden
Panasonic
Murata
GRM219R61A475KE19D
GRM319R61A475KA01D
GRM31MR60J475KA01L
GRM219R60J475KE01D
capacitance
GRM219R60J106KE19D
GRM319R60J106KE01D
LMK212BJ475KG-T
LMK316BJ475KD-T
JMK212BJ475KD-T
using
JMK212BJ106KD-T
JMK316BJ106KF-T
ECJ-2FB1A475K
ECJ-3YB1A475K
ECJ-2FB0J475K
ECJ-3YB0J475K
ECJ-2FB0J106K
ECJ-3YB0J106K
dielectric
with
Y5V or equivalent dielectric
Part #
Part #
the
frequency,
The control loop is
10uF.
without
formulations
www.enpirion.com
Value
4.7uF
4.7uF
4.7uF
4.7uF
4.7uF
4.7uF
4.7uF
4.7uF
4.7uF
4.7uF
4.7uF
Value
10uF
10uF
10uF
10uF
10uF
10uF
WVDC
WVDC
6.3V
6.3V
6.3V
10V
10V
10V
10V
10V
10V
10V
10V
6.3V
6.3V
6.3V
6.3V
6.3V
6.3V
bias,
EN5312QI
requiring
Enpirion
Case Size
Y5V or
Case Size
0805
1206
0805
1206
0805
1206
0805
1206
0805
1206
0805
0805
1206
0805
1206
0805
1206
lose
and