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
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
2.2
–40
°
C
≤
T
A
≤
+85
°
C
2.1
210
4.05
4.30
4.70
Symbol Condition
Min
Typ
(4)
220
2.5
2.7
2.8
Max
Units
mV
V
V
mV
V
V
mV
µA
°C
Note:
4) 100% production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization.
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 4.75V 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 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 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 higher than 2.7V
EN
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 to GND
SS
to set the soft-start period. See
Soft-Start Capacitor.
3
4
5
6
7
8
MP2303 Rev. 0.91
3/10/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
3
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