MP1593 Datasheet PDF - MPS
Part Number | MP1593 | |
Description | Step Down Converter | |
Manufacturers | MPS | |
Logo | ||
There is a preview and MP1593 download ( pdf file ) link at the bottom of this page. Total 11 Pages |
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General Description
The MP1593 is a step-down regulator with an
internal Power MOSFET. It achieves 3A
continuous output current over a wide input
supply range with excellent load and line
regulation.
Current mode operation provides fast transient
response and eases loop stabilization.
Fault condition protection includes cycle-by-cycle
current limiting and thermal shutdown.
Adjustable soft-start reduces the stress on the
input source at turn-on. In shutdown mode the
regulator draws 20µA of supply current.
The MP1593 requires a minimum number of
readily available external components to
complete a 3A step down DC to DC converter
solution.
Ordering Information
Part Number ∗
MP1593DN
Package
SOIC8 w/ Exposed
Paddle
Temperature
-40 to + 85°C
∗ For Tape & Reel use suffix - Z (e.g. MP1593DN-Z)
MP1593
3A, 28V
Step Down Converter
PRELIMINARY
Features
3A Output Current
Programmable Soft-Start
100mΩ Internal Power MOSFET Switch
Stable with Low ESR Output Ceramic
Capacitors
Up to 95% Efficiency
20µA Shutdown Mode
Fixed 385KHz Frequency
Thermal Shutdown
Cycle-by-Cycle Over Current Protection
Wide 4.75 to 28V Operating Input
Range
Output Adjustable From 1.22
Under Voltage Lockout
Available in 8 pin SOIC Package
Applications
Distributed Power Systems
Battery Charger
Pre-Regulator for Linear Regulators
Typical Application Circuit
INPUT
4.75to28V
IN BS
SW
EN M P1593
omSS
.c GND
FB
COMP
OUTPUT
2.5V,3A
www.datasheet4uMP1593 Rev 1.0_02/27/04
www.monolithicpower.com
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Monolithic Power Systems
MP1593
3A, 28V
Step Down Converter
PRELIMINARY
INPUT
4.75 to 28V
C1
10µF/35V
OPEN
NOT USED
C5
10nF
IN BS
SW
EN MP1593
SS
GND
FB
COMP
C6
Open
C3
3.9nF
R3
3.9K
L1
15µH
D1
R1
10.5K
R2
10K
OUTPUT
2.5V/3A
C2
22µF/10V
Ceramic
Figure 2: MP1593 with Murata 22µF, 10V Ceramic Output Capacitor
Application Information
Setting the Output Voltage
The output voltage is set using a resistive
voltage divider from the output voltage to FB
(see Figure 2). The voltage divider divides the
output voltage down by the ratio:
VFB = VOUT * R2 / (R1 + R2)
Thus the output voltage is:
VOUT = 1.222 * (R1 + R2) / R2
R2 can be as high as 100KΩ, but a typical
value is 10KΩ. Using that value, R1 is
determined by:
R1 = 8.18 * (VOUT – 1.222) (KΩ)
For example, for a 3.3V output voltage, R2 is
10KΩ, and R1 is 17KΩ.
Inductor
The inductor is required to supply constant
current to the output load while being driven by
the switched input voltage. A larger value
inductor results in less ripple current that in
turn results in lower output ripple voltage.
However, the larger value inductor has a larger
physical size, higher series resistance, and/or
lower saturation current. Choose an inductor
that does not saturate under the worst-case
load conditions. A good rule for determining
the inductance is to allow the peak-to-peak
ripple current in the inductor to be
approximately 30% of the maximum load
current. Also, make sure that the peak
inductor current (the load current plus half the
peak-to-peak inductor ripple current) is below
the 3.3A minimum current limit. The
inductance value can be calculated by the
equation:
L = (VOUT) * (VIN-VOUT) / (VIN * f * ∆I)
Where VOUT is the output voltage, VIN is the
input voltage, f is the switching frequency, and
∆I is the peak-to-peak inductor ripple current.
Table 2 lists a number of suitable inductors
from various manufacturers.
MP1593 Rev 1.0_02/27/04
www.monolithicpower.com
5
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for MP1593 electronic component. |
Information | Total 11 Pages | |
Link URL | [ Copy URL to Clipboard ] | |
Download | [ MP1593.PDF Datasheet ] |
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