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PDF MP2305 Data sheet ( Hoja de datos )
| Número de pieza | MP2305 | |
| Descripción | 23V Synchronous Rectified Step-Down Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MP2305 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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TM
The Future of Analog IC Technology TM
DESCRIPTION
The MP2305 is a monolithic synchronous buck
regulator. The device integrates 130mΩ
MOSFETS that provide 2A continuous load
current over a wide operating input voltage of
4.75V to 23V. Current mode control provides
fast transient response and cycle-by-cycle
current limit.
An adjustable soft-start prevents inrush current
at turn-on. Shutdown mode drops the supply
current to 1µA.
This device, available in an 8-pin SOIC
package, provides a very compact system
solution with minimal reliance on external
components.
EVALUATION BOARD REFERENCE
Board Number
EV2305DS-00A
Dimensions
2.0”X x 1.5”Y x 0.5”Z
MP2305
2A, 23V Synchronous Rectified
Step-Down Converter
FEATURES
• 2A Output Current
• Wide 4.75V to 23V Operating Input Range
• Integrated 130mΩ Power MOSFET Switches
• Output Adjustable from 0.923V to 20V
• Up to 93% Efficiency
• Programmable Soft-Start
• Stable with Low ESR Ceramic Output Capacitors
• Fixed 340KHz Frequency
• Cycle-by-Cycle Over Current Protection
• Input Under Voltage Lockout
APPLICATIONS
• Distributed Power Systems
• Networking Systems
• FPGA, DSP, ASIC Power Supplies
• Green Electronics/ Appliances
• Notebook Computers
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
INPUT
4.75V to 23V
C5
10nF
21
7 IN
EN
BS 3
SW
8
SS
MP2305
5
FB
GND
COMP
46
C3
3.3nF
OUTPUT
3.3V
2A
MP2305-TAC01
Efficiency vs
Load Current
100
95 VOUT = 3.3V
90
85 VOUT = 2.5V
80
75
70
65
60
55
50
0 0.5 1.0 1.5 2.0 2.5
LOAD CURRENT (A)
MP2305-EC01
MP2305 Rev. 1.7
4/17/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
1
1 page  
TM
MP2305 – 2A, 23V SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
OPERATION
FUNCTIONAL DESCRIPTION
The MP2305 is a synchronous rectified,
current-mode, step-down regulator. It regulates
input voltages from 4.75V to 23V down to an
output voltage as low as 0.923V, and supplies
up to 2A of load current.
The MP2305 uses current-mode control to
regulate the output voltage. The output voltage
is measured at FB through a resistive voltage
divider and amplified through the internal
transconductance error amplifier. The voltage at
the COMP pin is compared to the switch current
measured internally to control the output
voltage.
The converter uses internal N-Channel
MOSFET switches to step-down the input
voltage to the regulated output voltage. Since
the high side MOSFET requires a gate voltage
greater than the input voltage, a boost capacitor
connected between SW and BS is needed to
drive the high side gate. The boost capacitor is
charged from the internal 5V rail when SW is low.
When the MP2305 FB pin exceeds 20% of the
nominal regulation voltage of 0.923V, the over
voltage comparator is tripped and the COMP
pin and the SS pin are discharged to GND,
forcing the high-side switch off.
+
FB 5
1.1V --
+
0.3V --
SS 8
0.923V
--
+
+
OVP
RAMP
OSCILLATOR
CLK
100/340KHz
ERROR
AMPLIFIER
CURRENT
SENSE
AMPLIFIER
+
--
-- S Q
RQ
+ CURRENT
COMPARATOR
2 IN
5V
1 BS
3 SW
COMP 6
EN 7
2.5V +
--
EN OK
LOCKOUT
COMPARATOR
1.2V
+
1.5V --
SHUTDOWN
COMPARATOR
Figure 1—Functional Block Diagram
4 GND
OVP
EN
IN < 4.10V
IN
INTERNAL
REGULATORS
5V
MP2305_F01_BD01
MP2305 Rev. 1.7
4/17/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet MP2305.PDF ] | |
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