TM
MP2303
3A, 28V, 340KHz Synchronous Rectified
Step-Down Converter
The Future of Analog IC Technology
TM
INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE
DESCRIPTION
The MP2303 is a monolithic synchronous buck
regulator. The device integrates power
MOSFETS that provide 3A continuous load
current over a wide operating input voltage of
4.75V 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 1µA.
This device, available in 8-pin SOIC and 3x3
10-pin QFN packages, provides a very compact
system solution with minimal reliance on
external components.
FEATURES
•
•
•
•
•
•
•
•
•
•
•
3A Output Current
Wide 4.75V to 28V Operating Input Range
Integrated Power MOSFET Switches
Output Adjustable from 0.8V to 25V
Up to 95% Efficiency
Programmable Soft-Start
Stable with Low ESR Ceramic Output Capacitors
Fixed 340KHz Frequency
Cycle-by-Cycle Over Current Protection
Input Under Voltage Lockout
Thermally Enhanced 8-Pin SOIC and
3x3 QFN10 Packages
Distributed Power Systems
Pre-Regulator for Linear Regulators
Notebook Computers
APPLICATIONS
•
•
•
EVALUATION BOARD REFERENCE
Board Number
EV2303DN-00A
Dimensions
2.0”X x 1.5”Y x 0.5”Z
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
C5
10nF
BS
SS
Efficiency vs
Load Current
100
90
V
IN
= 12V
MP2303
SW
GND
COMP
FB
EFFICIENCY (%)
VIN
4.75V-28V
IN
EN
80
70
60
V
IN
= 24V
C3
3.3nF
V
OUT
= 5V
0
0.5
1.0
1.5
2.0
2.5
3.0
VOUT
5V/3A
50
LOAD CURRENT (A)
MP2303_TAC01
MP2303-EC01
MP2303 Rev. 0.92
5/2/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
1
TM
MP2303 – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE
PACKAGE REFERENCE
TOP VIEW
TOP VIEW
IN
BS
IN
SW
GND
1
2
3
4
8
7
6
5
SS
EN
COMP
FB
1
2
3
4
5
10
9
8
7
6
SS
BS
EN
COMP
FB
SW
GND
GND
GND
MP2303_PD01_SOIC8N
EXPOSED PAD
ON BACKSIDE
MP2303_PD02_QFN10
Part Number*
MP2303DN
*
Package
SOIC8N
(Exposed Pad)
Temperature
–40°C to +85°C
Part Number*
MP2303DQ
*
Package
3mm x 3mm
QFN10
Temperature
–40°C to +85°C
For Tape & Reel, add suffix –Z (eg. MP2303DN–Z)
For RoHS compliant packaging, add suffix –LF (eg.
MP2303DN–LF–Z)
For Tape & Reel, add suffix –Z (eg. MP2303DQ–Z)
For RoHS compliant packaging, add suffix –LF (eg.
MP2303DQ–LF–Z)
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
Lead Temperature ....................................260°C
Storage Temperature ............. –65°C to +150°C
Recommended Operating Conditions
(2)
Input Voltage V
IN
............................ 4.75V to 28V
Output Voltage V
OUT
........................ 0.8V to 25V
Ambient Operating Temperature ... –40°C to +85°C
Thermal Resistance
(3)
SOIC8N .................................. 50 ...... 10...
°C/W
3x3 QFN10 ............................. 50 ...... 12...
°C/W
Notes:
1) Exceeding these ratings may damage the device.
2) The device is not guaranteed to function outside of its
operating conditions.
3) Measured on approximately 1” square of 1 oz copper.
θ
JA
θ
JC
ELECTRICAL CHARACTERISTICS
(4)
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
V
FB
Symbol Condition
V
EN
= 0V
V
EN
= 2.7V, V
FB
= 1.0V
4.75V
≤
V
IN
≤
28V,
T
A
= +25
°
C
–40
°
C
≤
T
A
≤
+85
°
C
A
EA
G
EA
∆I
C
=
±10µA
550
0.780
0.772
0.90
0.95
400
820
Min
Typ
(4)
0.3
1.3
0.800
Max
3.0
1.5
0.820
0.828
1.00
1100
Units
µA
mA
V
V
V
V/V
µA/V
MP2303 Rev. 0.92
5/2/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
2
TM
MP2303 – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE
ELECTRICAL CHARACTERISTICS
(4)
(continued)
V
IN
= 12V, T
A
= +25°C, unless otherwise noted.
Parameter
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 Shutdown Threshold Voltage
Hysteresis
EN Lockout Threshold Voltage
EN Lockout Hysteresis
Input Under Voltage Lockout
Threshold
Input Under Voltage Lockout
Threshold Hysterisis
Soft-Start Current
Thermal Shutdown
UVLO
V
IN
rising, T
A
= +25
°
C
–40
°
C
≤
T
A
≤
+85
°
C
3.8
3.5
210
V
SS
= 0V
6
160
Symbol Condition
R
DS(ON)1
R
DS(ON)2
V
EN
= 0V, V
SW
= 0V
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
1.1
300
270
110
90
220
1.5
220
2.2
–40
°
C
≤
T
A
≤
+85
°
C
2.1
210
4.05
4.30
4.70
2.5
2.7
2.8
Min
Typ
(4)
125
125
0
6.3
1.25
9
340
380
400
Max
Units
mΩ
mΩ
µA
A
A
A/V
KHz
KHz
KHz
%
ns
V
mV
V
V
mV
V
V
mV
µA
°C
10
4.3
2.0
Note:
4) 100% production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization.
MP2303 Rev. 0.92
5/2/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
3
TM
MP2303 – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE
PIN FUNCTIONS
3x3
SOIC8N
QFN10
Pin #
Pin #
1
9
Name Description
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-
BS
Channel MOSFET 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. Drive IN with a 4.75V to 28V power source. Bypass IN to GND with a
IN
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
SW
output. Connect 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.
Ground. SOIC8: Connect the exposed pad to pin 4. 3x3 QFN10: Connect to pins
GND
3, 4 and 5 and ensure that said pins are tied together.
Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB
FB
with a resistive voltage divider from the output voltage. The feedback reference
voltage is 0.8V. 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
COMP
control loop. In some 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 higher
EN
than 2.7V to turn on the regulator, drive it lower than 1.1V to turn it off. Pull up to
the IN pin with 100kΩ resistor for automatic startup.
Soft-start Control Input. SS controls the soft-start period. Connect a capacitor from
SS
SS to GND to set the soft-start period. See
Soft-Start Capacitor.
2
1
3
4
5
2
3, 4, 5
6
6
7
7
8
8
10
MP2303 Rev. 0.92
5/2/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
4
TM
MP2303 – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
= 12V, V
O
= 3.3V, L = 10µH, C1 = 10µF, C2 = 22µF x 2, T
A
= +25°C, unless otherwise noted.
Feeback Voltage vs.
Efficiency vs
Temperature
Load Current
95
0.810
FEEDBACK VOLTAGE (V)
90
V
IN
= 12V
EFFICIENCY (%)
85
80
75
70
65
60
55
50
0
0.5
1.0
1.5
2.0
0.805
0.800
0.795
0.790
0.7850
0.780
-40
V
IN
= 12V
V
IN
= 28V
V
IN
= 24V
V
IN
= 4.75V
V
OUT
= 2.5V
2.5
3.0
3.5
-20
LOAD CURRENT (A)
MP2303-EC02
TEMPERATURE (oC)
0
20
40
60
80
MP2303-TPC01
UVLO Rising vs.
Temperature
4.5
2.70
Enable Lockout Threshold
vs. Temperature
345
2.65
2.60
2.55
2.50
2.45
2.40
2.35
Oscillator Frequency
UVLO THRESHOLD (V)
4.4
4.3
4.2
4.1
4.0
3.9
3.8
3.7
-40
-20
0
20
40
60
80
ENABLE VOLTAGE (V)
FREQUENCY (KHz)
340
335
330
TEMPERATURE (oC)
2.30
-40
-20
TEMPERATURE (oC)
0
20
40
60
80
325
-40
-20
TEMPERATURE (oC)
0
20
40
60
80
MP2303-TPC02
MP2303-TPC03
MP2303-TPC04
MP2303 Rev. 0.92
5/2/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
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