MP1410
2A Step Down
DC to DC Converter
MPS
Table 1: Pin Designator
#
1
2
Name
BS
IN
Description
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side n-channel MOSFET switch.
Connect a 10nF 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 15V 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 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.
Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a resistive
voltage divider from the output voltage. The feedback threshold is 1.22V.
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.
See Compensation.
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the
regulator, drive it low to turn it off. For automatic startup, leave EN unconnected.
No Connect
3
SW
4
5
GND
FB
6
7
8
COMP
EN
N/C
Figure 2: Functional Block Diagram
IN
2
Internal
Regulators
Slope
Compensation
Oscillator
40/400KHz
Shutdown
Comparator
0.7V
7
CLK
R
Current
Comparator
Q
M2
Σ
Current
Sense
Amplifier
5V
M1
S
Q
1
BS
3
SW
EN
1uA
1.8V
4
GND
2.30/2.53V
Lockout
Comparator
Frequency
Foldback
Comparator
0.7V
5
1.22V
FB
Error Amplifier
gm= 630uA/Volt
6
COMP
MP1410 Rev 1.6_ 07/25/03
3
MPS [ MONOLITHIC POWER SYSTEMS ]
