EP5352Q Datasheet, PDF (9/16 Pages) Enpirion, Inc. – 500/600/800mA Synchronous Buck Regulators With Integrated Inductor

V_IN
2.2uF
4.7uF
ENABLE
V_in
V_Sense
V_out
VS0
V_FB
VS1
VS2
GND
V_OUT
Ra
10μF
Rb
Figure 5. External Divider.
The output voltage is selected by the following
formula:
( ) V_OUT
= 0.603V
1+
Ra
Rb
R_a must be chosen as 200KΩ to maintain loop
gain. Then R_b is given as:
R ^{= 1.2x105 Ω}
b _{VOUT − 0.603}
Dynamically Adjustable Output
The EP53x2Q are 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 3.3mV/uS.
Dynamic transitioning between internal VID
settings and the external divider is not allowed.
Input and Output Capacitors
The input capacitance requirement is as
follows:
EP5352Q, EP5362Q = 2.2uF
EP5382Q = 4.7uF
Enpirion recommends that a low ESR MLCC
capacitor be used. The input capacitor must
use a X5R or X7R or equivalent dielectric
EP5382Q/EP5362Q/EP5352Q
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 of the control loop. 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 #
Murata
GRM21BR71A225KA01L
GRM31MR71A225KA01L
GRM21BR70J225KA01L
Value
2.2uF
WVDC
10V
6.3V
Case Size
0805
1206
0805
Panasonic
ECJ-2FB1A225K
ECJ-3YB1A225K
ECJ-2YB0J225K
10V
0805
1206
6.3V
0805
Taiyo Yuden LMK107BJ225KA-T
LMK212BJ225KG-T
Cin
Manufacturer Part #
Murata
GRM219R61A475KE19D
GRM319R61A475KA01D
GRM219R60J475KE01D
GRM31MR60J475KA01L
Value
4.7uF
10V
0603
0805
WVDC
10V
6.3V
Case Size
0805
1206
0805
1206
Panasonic
ECJ-2FB1A475K
ECJ-3YB1A475K
ECJ-2FB0J475K
ECJ-3YB0J475K
10V
0805
1206
6.3V
0805
1206
Taiyo Yuden LMK212BJ475KG-T
LMK316BJ475KD-T
JMK212BJ475KD-T
Cout
Manufacturer
Part #
Murata GRM219R60J106KE19D
GRM319R60J106KE01D
Value
10uF
10V
0805
1206
6.3V
0805
WVDC Case Size
6.3V
0805
1206
Panasonic
ECJ-2FB0J106K
ECJ-3YB0J106K
6.3V
0805
1206
Taiyo Yuden
JMK212BJ106KD-T
JMK316BJ106KF-T
6.3V
0805
1206
©Enpirion 2009 all rights reserved, E&OE
03132
9
4/28/2009
www.enpirion.com
Rev:B