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PDF MP1410 Data sheet ( Hoja de datos )

Número de pieza MP1410
Descripción 2A Step Down DC to DC Converter
Fabricantes MPS 
Logotipo MPS Logotipo



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Monolithic Power Systems
MP1410
2A Step Down
DC to DC Converter
www.dataGsheeetn4ue.croaml Description
The MP1410 is a monolithic step down switch
mode regulator with a built in internal Power
MOSFET. It achieves 2A 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. In
shutdown mode the regulator draws 25µA of
supply current.
The MP1410 requires a minimum number of
readily available standard external components.
Ordering Information
Part Number * Package
Temperature
MP1410ES
SOIC8
-20 to +85 °C
MP1410EP
PDIP8
-20 to +85 °C
EV0012
Evaluation Board
* For Tape & Reel use suffix - Z (e.g. MP1410ES-Z)
Features
2A Output Current
0.22Internal Power MOSFET Switch
Stable with Low ESR Output Ceramic
capacitors
Up to 95% Efficiency
20µA Shutdown Mode
Fixed 380KHz frequency
Thermal Shutdown
Cycle-by-cycle over current protection
Wide 4.75 to 15V operating input range
Output Adjustable from 1.22 to 13V
Programmable under voltage lockout
Available in 8 pin SO
Evaluation Board Available
Applications
PC Monitors
Distributed Power Systems
Battery Charger
Pre-Regulator for Linear Regulators
Figure 1: Typical Application Circuit
INPUT
4.75 to 15V
ENABLE
SHUTDOWN
MP1410
OUTPUT
2.5V/2A
Efficiency versus Output
Current and Voltage. VIN=10V
95
5.0V
90
3.3V
85
2.5V
80
75
70
0 0.5 1 1.5 2
Ou t pu t Cu r r e n t ( A)
MP1410 Rev 1.6_ 07/25/03
www.monolithicpower.com
1

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MP1410 pdf
Monolithic Power Systems
MP1410
2A Step Down
DC to DC Converter
www.datasIhneept4uut.cComapacitor
The input current to the step-down converter is
discontinuous, and therefore an input capacitor
C1 is required to supply the AC current to the
step-down converter while maintaining the DC
input voltage. A low ESR capacitor is required
to keep the noise at the IC to a minimum.
Ceramic capacitors are preferred, but tantalum
or low-ESR electrolytic capacitors may also
suffice.
The input capacitor value should be greater
than 10µF. The capacitor can be electrolytic,
tantalum or ceramic. However since it absorbs
the input switching current it requires an
adequate ripple current rating. Its RMS current
rating should be greater than approximately
1/2 of the DC load current.
For insuring stable operation C2 should be
placed as close to the IC as possible.
Alternately a smaller high quality ceramic
0.1µF capacitor may be placed closer to the IC
and a larger capacitor placed further away. If
using this technique, it is recommended that
the larger capacitor be a tantalum or
electrolytic type. All ceramic capacitors should
be placed close to the MP1410.
Output Capacitor
The output capacitor is required to maintain
the DC output voltage. Low ESR capacitors
are preferred to keep the output voltage ripple
low. The characteristics of the output
capacitor also affect the stability of the
regulation control system. Ceramic, tantalum,
or low ESR electrolytic capacitors are
recommended. In the case of ceramic
capacitors, the impedance at the switching
frequency is dominated by the capacitance,
and so the output voltage ripple is mostly
independent of the ESR. The output voltage
ripple is estimated to be:
VRIPPLE ~= 1.4 * VIN * (fLC/fSW)^2
Where VRIPPLE is the output ripple voltage, VIN
is the input voltage, fLC is the resonant
frequency of the LC filter, fSW is the switching
frequency. In the case of tanatalum or low-
ESR electrolytic capacitors, the ESR
dominates the impedance at the switching
frequency, and so the output ripple is
calculated as:
VRIPPLE ~= I * RESR
Where VRIPPLE is the output voltage ripple, I is
the inductor ripple current, and RESR is the
equivalent series resistance of the output
capacitors.
Output Rectifier Diode
The output rectifier diode supplies the current
to the inductor when the high-side switch is off.
To reduce losses due to the diode forward
voltage and recovery times, use a Schottky
rectifier.
Tables 3 provides the Schottky rectifier part
numbers based on the maximum input voltage
and current rating.
Table 3: Schottky Rectifier Selection Guide
VIN (Max)
15V
20V
2A Load Current
Part Number
Vendor
30BQ15
4
B220
1
SK23
6
SR32
6
Table 4 lists some rectifier manufacturers.
Table 4: Schottky Diode Manufacturers
# Vendor
Web Site
1 Diodes, Inc.
www.diodes.com
2 Fairchild Semiconductor www.fairchildsemi.com
3 General Semiconductor www.gensemi.com
4 International Rectifier
www.irf.com
5 On Semiconductor
www.onsemi.com
6 Pan Jit International
www.panjit.com.tw
Choose a rectifier who’s maximum reverse
voltage rating is greater than the maximum
input voltage, and who’s current rating is
greater than the maximum load current.
MP1410 Rev 1.6_ 07/25/03
www.monolithicpower.com
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