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PDF MP3428 Data sheet ( Hoja de datos )
| Número de pieza | MP3428 | |
| Descripción | 13A Current Mode / Boost Converter | |
| Fabricantes | MPS | |
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MP3428
13A Current Mode, Boost Converter
with Input Disconnecting Function
The Future of Analog IC Technology
PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE
MPS CONFIDENTIAL AND PROPRIETARY INFORMATION– INTERNAL USE ONLY
DESCRIPTION
The MP3428 is a 600 kHz fixed frequency, high
efficiency, wide input range, current mode boost
converter with input disconnecting function and
adjustable inrush current limit. This converter is
specially designed for systems where a voltage
bus must be protected to prevent systems from
being interrupted or damaged by the load short
conditions. It features internally a current limit
switch gate drive, a 10mΩ, 24V power switch
and a synchronous gate driver for high
converter efficiency. An external compensation
pin gives the user flexibility in setting loop
dynamics and obtaining the optimal transient
performance at all conditions.
The MP3428 also includes under-voltage
lockout, switching current limiting and thermal
shutdown to prevent damage in the event of
output overload. The MP3428 is available in a
low profile 22-pin 3mmx4mm FCQFN package.
TYPICAL APPLICATION
FEATURES
• Fully Compliant to Intel Thunderbolt
Power Spec.
• Input Disconnecting Function
• Input Current Limit Switch Gate Drive
• SR Gate Drive
• Internal 10mΩ, 24V Power MOSFET
• Enhanced PWM Mode for Fast Transient
Response
• 3V-20V Wide Input Range
• Output Voltage as High as 22V
• Programmable UVLO, UVLO Hysteresis
and Soft-Start
• Low Shutdown Current < 1µA
• Thermal Shutdown at 160°C
• Available in 3x4mm FCQFN22 Package
APPLICATIONS
• Thunderbolt Interface
• Notebook and Tablet
• Hot Swap Power Management
• Telecom Power Supply
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
MP3428 Rev. 0.1
www.MonolithicPower.com
4/10/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
Preliminary Specifications Subject to Change
© 2013 MPS. All Rights Reserved.
1
1 page  
MP3428 – 13A CURRENT MODE, BOOST CONVERTER WITH INPUT DISCONNECTING FUNCTION
PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE
MPS CONFIDENTIAL AND PROPRIETARY INFORMATION– INTERNAL USE ONLY
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.3V, VOUT = 12V, L = 1.5µH, TA = 25°C, unless otherwise noted.
Insert
Performance Curve
Provide Source File
(Excel Data & Chart)
(Format > Picture > Layout > In Front of Text)
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MP3428 Rev. 0.1
www.MonolithicPower.com
4/10/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
Preliminary Specifications Subject to Change
© 2013 MPS. All Rights Reserved.
5
5 Page 
MP3428 – 13A CURRENT MODE, BOOST CONVERTER WITH INPUT DISCONNECTING FUNCTION
PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE
MPS CONFIDENTIAL AND PROPRIETARY INFORMATION– INTERNAL USE ONLY
Compensation
The output of the transconductance error
amplifier (COMP) is used to compensate the
regulation control system. The system uses two
poles and one zero to stabilize the control loop.
The poles are FP1 set by the output capacitor
COUT and the load resistance and FP2 set by the
compensation capacitor CCOMP and the
compensation resistor RCOMP. These are
determined by the equations:
FP1
=
1
2 × ∏×RLOAD
× COUT
(Hz)
FP2
=
GEA
2 × ∏×AVEA × CCOMP
(Hz)
FP3
=
1
2 × ∏×RCOMP × CCOMP
(Hz)
Where RLOAD is the load resistance, GEA is the
error amplifier transconductance, and AVEA is
the error amplifier voltage gain.
The DC loop gain is,
A VDC
=
A VEA
× VIN × RLOAD × VFB
0.5 × VOUT
× GCS
(V / V)
Where GCS is the compensation voltage to
inductor current gain, and the VFB is the
feedback regulation threshold.
There is also a right-half-plane zero (FRHPZ) that
exists in continuous conduction mode (inductor
current does not drop to zero on each cycle)
step-up converters. The frequency of the right
half plane zero is:
Then slowly increase the resistor R6 and check
the load step response on a bench to make
sure the ringing and overshoot on the output
voltage at the edge of the load steps is minimal.
Finally, the compensation needs to be checked
by calculating the DC loop gain and the
crossover frequency. The crossover frequency
where the loop gain drops to 0dB (a gain of 1)
can be obtained visually by placing a -
20dB/decade slope at each pole, and a
+20dB/decade slope at each zero. The
crossover frequency should be at least one
decade below the frequency of the right-half-
plane zero at maximum output load current to
obtain high enough phase margin for stability.
Layout Considerations
High frequency switching regulators require
very careful layout for stable operation and low
noise. All components must be placed as close
to the IC as possible. Keep the path between
L1, D1, and COUT extremely short for minimal
noise and ringing. CIN must be placed close to
the INCL pin for best decoupling. All feedback
components must be kept close to the FB pin to
prevent noise injection on the FB pin trace. The
ground return of CIN and COUT should be tied
close to the GND pin. See the MP3428 demo
board layout for reference.
FRHP
=
RLOAD
2× ∏×L
×
(
VIN
VOUT
)2
(Hz)
The “Component Selection” table lists generally
recommended compensation components for
different input voltages, output voltages and
capacitances of most frequently used output
ceramic capacitors. Ceramic capacitors have
extremely low ESR, therefore the second
compensation capacitor (from COMP to GND)
is not required.
For faster control loop and better transient
response, set the capacitor C7 to the
recommended value in the table.
MP3428 Rev. 0.1
www.MonolithicPower.com
4/10/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
Preliminary Specifications Subject to Change
© 2013 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MP3428.PDF ] | |
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