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PDF MP1494 Data sheet ( Hoja de datos )

Número de pieza MP1494
Descripción High-Efficiency 2A 16V 500kHz Synchronous Step-Down Converter
Fabricantes MPS 
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MP1494
The Future of Analog IC Technology
DESCRIPTION
The MP1494 is a high-f requency, synchronous,
rectified, st ep-down, switch-mode converter
with built-in power MOSFETs. It o ffers a very
compact solution to achieve a 2A continuous
output curr ent with e xcellent loa d and line
regulation o ver a wide input supply range. The
MP1494 ha s synchronous mode operation fo r
higher efficiency over t he output current load
range.
Current-mode operation provides fast transien t
response and eases loop stabilization.
Full protection feature s include over-current
protection and thermal shut down.
The MP149 4 requires a minimal number of
readily-available standard external components,
and is available in a space- saving 8-pin
TSOT23 package.
High-Efficiency, 2A, 16V, 500kHz
Synchronous, Step-Down Converter
FEATURES
Wide 4.5V-to-16V Operating Input Range
100m /40mLow RDS(ON) Internal Power
MOSFETs
High-Efficiency Synchronous Mode
Operation
Fixed 500kHz Switching Frequency
Synchronizes from a 200kHz-to-2MHz
External Clock
AAM Power-Save Mode
Internal Soft-Start
OCP Protection and Hiccup
Thermal Shutdown
Output Adjustable from 0.8V
Available in an 8-pin TSOT-23 Package
APPLICATIONS
Notebook Systems and I/O Power
Digital Set-Top Boxes
Flat-Panel Television and Monitors
Distributed Power Systems
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit M PS website u nder Q uality Ass urance. “ MPS” a nd “The
Future of Analog IC Technology” are Registered Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
4.5V-16V
VIN
C1
22
EN/
SYNC
C3 R3
0.1 90.9k
R5
10k
2 IN
6 EN/SYNC
R4
5 10
BST
SW 3
C4
L1
7 VCC
1 AAM GND
4
FB 8
R1
R9
33k
40.2k
R2
13k
3.3V/2A
C2
47
MP1494 Rev. 1.04
www.MonolithicPower.com
12/26/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
1
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MP1494 pdf
MP1494 – SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Performance waveforms are tested on the evaluation board of the Design Example section.
VIN = 12V, VOUT = 3.3V, AAM=0.5V, TA = 25°C, unless otherwise noted.
Startup through
Input Voltage
IOUT = 0A
Shutdown through
Input Voltage
IOUT =0A
VOUT/AC
50mV/div.
IOUT
1A/div.
VIN
5V/div.
VOUT
2V/div.
VSW
5V/div.
IINDUCTOR
2A/div.
VIN
5V/div.
VOUT
2V/div.
VSW
5V/div.
IINDUCTOR
2A/div.
Startup through
Input Voltage
IOUT = 2A
VIN
5V/div.
VOUT
2V/div.
VSW
5V/div.
IINDUCTOR
2A/div.
Shutdown through
Input Voltage
IOUT = 2A
VIN
5V/div.
VOUT
2V/div.
VSW
5V/div.
IINDUCTOR
2A/div.
Startup through Enable
IOUT = 0A
VEN
5V/div.
VOUT
2V/div.
VSW
5V/div.
IINDUCTOR
2A/div.
Shuthdown through Enable
IOUT = 0A
Startup through Enable
IOUT = 2A
Shutdown through Enable
IOUT = 2A
VEN
5V/div.
VOUT
2V/div.
VEN
5V/div.
VOUT
2V/div.
VEN
5V/div.
VOUT
2V/div.
VSW
5V/div.
IINDUCTOR
2A/div.
VSW
5V/div.
IINDUCTOR
2A/div.
VSW
5V/div.
IINDUCTOR
2A/div.
MP1494 Rev. 1.04
www.MonolithicPower.com
12/26/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
5

5 Page





MP1494 arduino
MP1494 – SYNCHRONOUS STEP-DOWN CONVERTER
APPLICATION INFORMATION
Setting the Output Voltage
The external resistor divider sets the output
voltage (see Typical Application on page 1). The
feedback resistor R1 also sets the feedback loop
bandwidth with the internal compensation
capacitor (see Typical Application on page 1).
Choose R1 around 40k. R2 is then given by:
R1
R2 =
V
1OUT
0.807 V
The T-type network—as shown in Figure 4—is
highly recommended when VOUT is low.
FB 8
RT
R1
VOUT
R2
Figure 4: T-Type Network
Table 1 lists the re commended T -type resist ors
value for common output voltages.
Table 1: Resistor Selection for Common Output
Voltages
VOUT (V)
R1 (k) R2 (k) Rt (k)
1.0 20.5(1%
) 82(1%) 82(1%)
1.2 30.1(1%
) 60.4(1%) 82(1%)
1.8 40.2(1%
) 32.4(1%) 56(1%)
2.5 40.2(1%
) 19.1(1%) 33(1%)
3.3 40.2(1%
) 13(1%) 33(1%)
5 40.2(1%
) 7.68(1%) 33(1%)
Selecting the Inductor
Use a1µH-t o-10µH inductor with a DC current
rating of at least 25% percent higher than the
maximum load current for most applications. For
highest efficiency, use an inductor with a DC
resistance less than 15m. For most designs,
the inductance value can be derived from the
following equation.
L1
=
VOUT ×−(VIN VOUT )
VIIN ×Δ L × fOSC
Where ΔIL is the inductor ripple current.
Choose th e inductor ripple current to b e
approximately 30% of th e maximum load current.
The maximum inductor peak current is:
IL(MAX)
= ILOAD
+
ΔIL
2
Use a larg er inductor for improved efficiency
under light-load conditions—below 100mA.
Setting the AAM Voltage
The AAM voltage sets the transitio n point from
AAM to CCM. Select a voltage to balance
efficiency, stability, ripple, and transient.
A low AAM voltage improves stabilit y and ripple,
but degrades transient and efficiency during AAM.
Likewise, a high AAM voltage improves th e
transient a nd efficien cy during AAM, b
ut
degrades stability and ripple.
The AAM voltage comes from the tap of a
resistor divider from V CC (5V) to GND, as shown
in Figure 5.
VCC(5V)
R3
AAM
R4
Figure 5: AAM Network
Generally, choose R4 to be around 10k
R3 is:
R3
=
R4⎜⎛
VCC
AAM
1⎟⎞
, then
MP1494 Rev. 1.04
www.MonolithicPower.com
12/26/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
11

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