Diodes AP3407/A - Manual (Page 2)

Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A
Dec. 2011 Rev. 1. 3 BCD Semiconductor Manufacturing Limited
2
1
2
3 4
5 EN
GND
SW
FB
VIN
1
2
3 4
5 VIN
GND
EN
SW
FB
Pin Configuration
K Package
(SOT-23-5)
(For AP3407) (For AP3407A)
Figure 2. Pin Configuration of AP3407/A (Top View)
Pin Description
Pin Number
AP3407 AP3407A
Pin Name Function
1 3 EN
Control input pin. Forcing this pin above 1.5V enables
the IC. Forcing this pin below 0.4V shuts down the IC.
When the IC is in shutdown mode, all functions are
disabled to decrease the supply current below 1.2A
2 2 GND Ground pin
3 5 SW
Power switch output pin. Inductor connection to drain
of the internal PFET and NFET switches
4 1 VIN
Supply input pin. Bypass to GND with a 4.7
µF or
greater ceramic capacitor
5 4 FB
This is the feedback pin of the device. Connect this pin
directly to the output if the fixed output voltage version
is used. For the adjustable version an external resistor
divider is connected to this pin.