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Rev. E, Sep 2005
ML3406
Pin Configuration
Marking Rule
Description
Symbol
1 Product Name: DC-DC Step Down
7
2 Product Series: 01:ML3406
1
Vout=FB
B
Vout=1.5V
5
3 Item
Vout=1.8V
8
4
Pin Functions
Run (Pin1):
Run control Input. Forcing this pin above 1.5V enables the
part. Forcing this pin below 0.3V shuts down the device. In
shutdown, all functions are disabled drawing <1µA supply
current. Do not leave RUN floating.
GND (Pin 2):
Ground Pin.
SW (Pin 3):
Switch Node Connection to Inductor. This pin connects to
the drains of the internal main and synchronous power
MOSFET switches.
Vin (Pin 4):
Main Supply Pin. Must be closely decoupled to GND, Pin 2,
with a 2.2µF or greater ceramic capacitor.
VFB (Pin 5) (ML3406-FB):
Feedback Pin. Receives the feedback voltage from an
external resistive divider across the output.
Vout (Pin5) (ML3406-1.5V, 1.8V)
Output voltage Feedback Pin. An internal resistive divider
divides the output voltage down for comparison to the
internal reference voltage