EN5312QI 查看數據表（PDF） - Enpirion, Inc.
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EN5312QI Datasheet PDF : 16 Pages
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March 2007
VIN
4.7uF
ENABLE
Vin
VSense
Vout
VS0
VFB
VS1
VS2
GND
VOUT
Ra
10µF
Rb
Figure 4. External Divider.
The output voltage is selected by the following
formula:
( ) VOUT
= 0.603V
1+
Ra
Rb
Ra must be chosen as 200KΩ to maintain loop
gain. Then Rb is given as:
R = 1.2x105 Ω
b VOUT − 0.603
VOUT can be programmed over the range of
0.6V to VIN – 0.6V (0.6 is the nominal full load
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 as the output voltage levels
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
EN5312QI
formulation. Y5V or equivalent dielectric
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. The control loop is
designed to be stable with up to 60uF of total
output capacitance without requiring
modification to the compensation network.
Capacitance above the 10uF minimum should
be added if the transient performance is not
sufficient using the 10uF.
Enpirion
recommends a low ESR MLCC type capacitor
be used.
The output capacitor must use a X5R or X7R
or equivalent dielectric formulation. Y5V or
equivalent dielectric formulations lose
capacitance with frequency, bias, and
temperature and are not suitable for switch-
mode DC-DC converter input and output filter
applications.
Cin
Manufacturer
Part #
Value WVDC Case Size
Murata
GRM219R61A475KE19D 4.7uF
10V
GRM319R61A475KA01D 4.7uF
10V
GRM219R60J475KE01D 4.7uF
10V
GRM31MR60J475KA01L 4.7uF
10V
0805
1206
0805
1206
Panasonic
ECJ-2FB1A475K
ECJ-3YB1A475K
ECJ-2FB0J475K
ECJ-3YB0J475K
4.7uF
4.7uF
4.7uF
4.7uF
10V
10V
6.3V
6.3V
0805
1206
0805
1206
Taiyo Yuden
Cout
Manufacturer
LMK212BJ475KG-T
LMK316BJ475KD-T
JMK212BJ475KD-T
Part #
4.7uF
4.7uF
4.7uF
Value
10V
10V
6.3V
0805
1206
0805
WVDC Case Size
Murata
GRM219R60J106KE19D
GRM319R60J106KE01D
10uF
10uF
6.3V
6.3V
0805
1206
Panasonic
ECJ-2FB0J106K
ECJ-3YB0J106K
10uF
10uF
6.3V
6.3V
0805
1206
Taiyo Yuden
JMK212BJ106KD-T
JMK316BJ106KF-T
10uF
10uF
6.3V
6.3V
0805
1206
©Enpirion 2007 all rights reserved, E&OE
9
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