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PDF MP2362 Data sheet ( Hoja de datos )
| Número de pieza | MP2362 | |
| Descripción | 380KHz Step-Down Converter | |
| Fabricantes | MPS | |
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MP2362
Dual 2A, 23V, 380KHz Step-Down Converter
with Frequency Synchronization
The Future of Analog IC Technology
DESCRIPTION
The MP2362 is a dual monolithic step-down
switch mode converter with built-in internal
power MOSFETs. It achieves 2A continuous
output current for each output over a wide input
supply range with excellent load and line
regulation. Each channel can be independently
synchronized to a frequency up to 1.2MHz.
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 40µA of
supply current.
The MP2362 requires a minimum number of
readily available standard external components.
EVALUATION BOARD REFERENCE
Board Number
EV2362DF-00A
Dimensions
2.2”X x 1.6”Y x 0.4”Z
FEATURES
• 2A Current for Each Output
• 0.18Ω Internal Power MOSFET Switch
• Stable with Low ESR Output Ceramic
Capacitors
• Up to 90% Efficiency
• 40µA Shutdown Mode
• Fixed 380KHz Frequency
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Wide 4.75V to 23V Operating Input Range
• Each Output Adjustable from 1.22V to 16V
• Configurable for Single Output with Double
the Current
• Programmable Under Voltage Lockout
• Frequency Synchronization Input
• Available in TSSOP20 with Exposed Pad
Package
APPLICATIONS
• Distributed Power Systems
• I/O and Core supplies
• Set top boxes
• Cable Modems
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
12V
3.3V @ 2A
SYNC CLOCK
OFF ON
10nF
B230A
1 SYNCA
ENA 20
2 NC1
COMPA 19
3 BSA
FBA 18
4 INA
SGB 17
5 SWA
6 PGA
MP2362
PGB 16
SWB 15
7 SGA
8 FBB
INB
NC2
14
13 10nF
9 COMPB
BSB 12
10 ENB
SYNCB 11
10nF
B230A
OFF ON
5V @ 2A
10nF
Efficiency vs
Output Current Voltage
95 VOUT = 5.0V
90 VOUT = 3.3V
85 VOUT = 2.5V
80
75
VIN = 10V
70
0 0.5 1 1.5 2
OUTPUT CURRENT (A)
MP2362 Rev. 0.93
1/25/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
1
1 page  
MP2362 — DUAL 2A, 23V, 380KHZ STEP-DOWN CONVERTER
OPERATION
The MP2362 is a dual channel current mode
regulator. The COMP pin voltage is proportional
to the peak inductor current. At the beginning of
a cycle, the upper transistor M1 is off, and the
lower transistor M2 is on (see Figure 1). The
COMP pin voltage is higher than the current
sense amplifier output, and the current
comparator’s output is low. The rising edge of
the 380KHz CLK signal sets the RS Flip-Flop.
Its output turns off M2 and turns on M1 thus
connecting the SW pin and inductor to the input
supply. The increasing inductor current is
sensed and amplified by the Current Sense
Amplifier. Ramp compensation is summed to
Current Sense Amplifier output and compared
to the Error Amplifier output by the Current
Comparator.
When the sum of the Current Sense Amplifier
output and the Slope Compensation signal
exceeds the COMP pin voltage, the RS Flip-
Flop is reset and the MP2362 reverts to its
initial M1 off, M2 on state.
If the sum of the Current Sense Amplifier output
and the Slope Compensation signal does not
exceed the COMP voltage, the falling edge of
the CLK resets the Flip-Flop.
The output of the Error Amplifier integrates the
voltage difference between the feedback and
the 1.22V bandgap reference. The polarity is
such that a voltage at the FB pin lower than
1.22V increases the COMP pin voltage. Since
the COMP pin voltage is proportional to the
peak inductor current, an increase in its voltage
increases current delivered to the output. The
lower 10Ω switch ensures that the bootstrap
capacitor voltage is charged during light load
conditions. External Schottky Diode D1 carries
the inductor current when M1 is off (see Figure 1).
INA/
INB
SYNCA/
SYNCB
ENA/
ENB
INTERNAL
REGULATORS
OSCILLATOR SLOPE
35/380KHz COMP
CLK
+
1.0V --
--
SHUTDOWN
COMPARATOR
LOCKOUT
COMPARATOR
2.5V/
2.29V
+
+
--
CURRENT
SENSE
AMPLIFIER
+
--
+ SQ
RQ
-- CURRENT
COMPARATOR
1.8V
FREQUENCY
FOLDBACK
COMPARATOR
-- 0.7V 1.222V +
ERROR
AMPLIFIER
SGA/
SGB
FBA / FBB
Figure 1—Functional Block Diagram
(Diagram portrays ½ of the MP2362)
5V
BSA/
BSB
SWA/
SWB
COMPA/
COMPB
PGA/
PGB
MP2362 Rev. 0.93
1/25/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
5
5 Page 
MP2362 — DUAL 2A, 23V, 380KHZ STEP-DOWN CONVERTER
PACKAGE INFORMATION
TSSOP20F
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
MP2362 Rev. 0.93
1/25/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
11
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| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MP2362.PDF ] | |
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