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电源稳压芯片应用

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带使能端的稳压电源设计资料

MP2303A

3A,  28V,  360kHz  Synchronous  Rectified

Step-Down  Converter

文档内容节选

MP2303A 3A 28V 360kHz Synchronous Rectified StepDown Converter Integrated MOSFET Switches FEATURES 3A Output Current Wide 47V to 28V Operating Input Range Output Adjustable from 080V to 25V Up to 95 Efficiency Programmable SoftStart Stable with Low ESR Ceramic Output Capacitors Fixed 360kHz Frequency CyclebyCycle Over Current Protection Available in thermally enhanced 8Pin SOIC Input Under Voltage Lockout and PDIP8 packages APPLICATIONS Distributed Power System......

MP2303A
3A, 28V, 360kHz Synchronous Rectified
Step-Down Converter
The Future of Analog IC Technology
DESCRIPTION
The MP2303A is a monolithic synchronous
buck regulator. The device integrates a 150mΩ
high-side MOSFET and a 80mΩ low-side
MOSFET that provide 3A continuous load
current over a wide operating input voltage of
4.7V to 28V. Current mode control provides fast
transient response and cycle-by-cycle current
limit.
An adjustable soft-start prevents inrush current
at turn-on. In shutdown mode, the supply
current drops to lower than 1μA.
This device, available in an 8-pin SOIC and
PDIP-8 packages, provides a very compact
system solution with minimal reliance on
external components.
FEATURES
3A Output Current
Wide 4.7V to 28V Operating Input Range
Integrated MOSFET Switches
Output Adjustable from 0.80V to 25V
Up to 95% Efficiency
Programmable Soft-Start
Stable with Low ESR Ceramic Output Capacitors
Fixed 360kHz Frequency
Cycle-by-Cycle Over Current Protection
Input Under Voltage Lockout
Available in thermally enhanced 8-Pin SOIC
and PDIP-8 packages
Distributed Power Systems
Pre-Regulator for Linear Regulators
Notebook Computers
APPLICATIONS
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.
TYPICAL APPLICATION
C5
10nF
100
90
V
IN
=5V
V
IN
=12V
2
IN
7
EN
8
1
BS
3
SW
80
70
60
50
40
MP2303A
SS
GND
4
FB
COMP
6
V
IN
=28V
V
IN
=24V
5
V
OUT
=3.3
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT CURRENT
MP2303A Rev.1.1
7/25/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
1
MP2303A – 3A, 28V, 360kHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
ORDERING INFORMATION
Part Number
MP2303ADN*
MP2303ADP**
Package
SOIC8E
PDIP8
Top Marking
M2303ADN
MP2303A
Free Air Temperature (T
A
)
-40C to +85C
-40C to +85C
* For Tape & Reel, add suffix –Z (e.g. MP2303ADN–Z);
For RoHS compliant packaging, add suffix –LF (e.g. MP2303ADN–LF–Z)
**
For Tape & Reel, add suffix –Z (e.g. MP2303ADP–Z);
For RoHS compliant packaging, add suffix –LF (e.g. MP2303ADP–LF–Z)
PACKAGE REFERENCE
TOP VIEW
8
7
6
5
SS
EN
COMP
FB
BS
IN
SW
GND
1
2
3
4
8
7
6
5
SS
EN
COMP
FB
TOP VIEW
BS
IN
SW
GND
1
2
3
4
MP2303A_PD01-PDIP8
ABSOLUTE MAXIMUM RATINGS
(1)
Supply Voltage V
IN
........................-0.3V to +30V
Switch Voltage V
SW
.................. -1V to V
IN
+ 0.3V
Boost Voltage V
BS
.......... V
SW
- 0.3V to V
SW
+ 6V
All Other Pins ..................................-0.3V to +6V
Junction Temperature ...............................150°C
Continuous Power Dissipation
(T
A
=
(2)
+25°C)
SOIC8E ...................................................... 2.5W
PDIP8 ........................................................ 1.2W
Lead Temperature ....................................260°C
Storage Temperature .............. -65°C to +150°C
Thermal Resistance
(4)
SOIC8E .................................. 50 ...... 10...
C/W
PDIP8 .................................... 105 ..... 45...
C/W
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature T
J
(MAX), the junction-to-
ambient thermal resistance
θ
JA
, and the ambient temperature
T
A
. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by P
D
(MAX) = (T
J
(MAX)-T
A
)/θ
JA
. Exceeding the maximum allowable power
dissipation will cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB..
θ
JA
θ
JC
Recommended Operating Conditions
(3)
Input Voltage V
IN
.............................. 4.7V to 28V
Output Voltage V
OUT
....................... 0.80V to 25V
Maximum Junction Temp. (T
J
) ................ +125°C
MP2303A Rev.1.1
7/25/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
2
MP2303A – 3A, 28V, 360kHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
(5)
V
IN
= 12V, T
A
= +25°C, unless otherwise noted.
Parameter
Shutdown Supply Current
Supply Current
Feedback Voltage
OVP Threshold Voltage
Error Amplifier Voltage Gain
Error Amplifier Transconductance
High-Side Switch-On Resistance
Low-Side Switch-On Resistance
High-Side Switch Leakage Current
Upper Switch Current Limit
Lower Switch Current Limit
COMP to Current Sense
Transconductance
Oscillation Frequency
Short Circuit Oscillation Frequency
Maximum Duty Cycle
Minimum On Time
EN Shutdown Threshold Voltage
EN Threshold Voltage Hysteresis
EN Input Current
Input Under Voltage Lockout
Threshold
Input Under Voltage Lockout
Threshold Hysterisis
Soft-Start Current
Thermal Shutdown
V
FB
Symbol Condition
V
EN
= 0V
V
EN
= 2.7V, V
FB
= 1.0V
4.7V
V
IN
28V,
T
A
= +25
°
C
-40
°
C
≤
T
A
≤
+85
°
C
A
EA
G
EA
R
DS(ON)1
R
DS(ON)2
V
EN
= 0V, V
SW
= 0V
4.3
From Drain to Source
G
CS
F
osc1
F
osc2
D
MAX
T
A
= +25
°
C
-40
°
C
≤
T
A
≤
+85
°
C
V
FB
= 0V
V
FB
= 0.7V
V
EN
Rising
V
EN
= 5V
UVLO
V
IN
rising, T
A
= +25
°
C
0
°
C
≤
T
A
≤
+70
°
C
3.6
3.2
125
V
SS
= 0V
6
160
3.95
310
290
85
1.0
55
90
180
1.3
205
I
C
=
10μA
550
0.780
0.765
0.90
0.95
400
820
150
80
0
6.0
1.25
7
360
410
430
Min
Typ
(5)
0.3
1.45
0.800
Max
3.0
1.6
0.820
0.835
1.00
1100
Units
μA
mA
V
V
V
V/V
μA/V
mΩ
mΩ
μA
A
A
A/V
kHz
kHz
kHz
%
ns
V
mV
μA
V
V
mV
μA
°C
10
1.6
2
4.3
4.5
Notes:
5) 100% production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization.
MP2303A Rev.1.1
7/25/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
3
MP2303A – 3A, 28V, 360kHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
PIN FUNCTIONS
Pin #
1
2
Name Description
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel MOSFET
BS
switch. Connect a 0.01μF or greater capacitor from SW to BS to power the high side switch.
Power Input. IN supplies the power to the IC, as well as the step-down converter switches.
IN
Drive IN with a 4.7V to 28V power source. Bypass IN to GND with a suitably large capacitor to
eliminate noise on the input to the IC. See
Input Capacitor.
Power Switching Output. SW is the switching node that supplies power to the output. Connect
SW
the output LC filter from SW to the output load. Note that a capacitor is required from SW to
BS to power the high-side switch.
GND Ground (Connect Exposed Pad to Pin 4)
Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a
FB
resistive voltage divider from the output voltage. The feedback threshold is 0.80V. See
Setting
the Output Voltage.
Compensation Node. COMP is used to compensate the regulation control loop. Connect a
series RC network from COMP to GND to compensate the regulation control loop. In some
COMP
cases, an additional capacitor from COMP to GND is required. See
Compensation
Components.
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on
EN
the regulator, drive it low to turn it off. Connect EN with IN through a resistive voltage divider
for automatic startup. Do not float this pin.
Soft-start Control Input. SS controls the soft-start period. Connect a capacitor from SS to GND
SS
to set the soft-start period. A 0.1μF capacitor sets the soft-start period to 15ms. To disable the
soft-start feature, leave SS unconnected.
3
4
5
6
7
8
MP2303A Rev.1.1
7/25/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
4
MP2303A – 3A, 28V, 360kHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
= 12V, V
OUT
= 3.3V, T
A
= +27ºC, unless otherwise noted.
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
5
10
15
20
120
100
80
60
40
20
V
FB
=1V
25
30
0
0
V
EN
=0V
10
20
30
40
50
6
5
4
3
2
1
0
V
FB
=0.6V
0
0.2
0.4
0.6
0.8
1.0
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
1
2
3
V
IN
=12V
V
IN
=5V
V
IN
=28V
1.0
0.5
0
-0.5
-1.0
-1.5
1.0
0.5
0
-0.5
V
IN
=5V
V
IN
=12V
V
IN
=24V
V
IN
=28V
0
0.5
1
1.5 2.0 2.5 3.0 3.5
-1.0
-1.5
-2.0
0
5
10
15
20
25
30
I
OUT
=1.5A
I
OUT
=3A
V
IN
=24V
-2.0
-2.5
4
5
6
-3.0
MP2303A Rev.1.1
7/25/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
5
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