Step-down (Buck)

DC-DC Converters

AKM's Step-Down DCDC Converters are most suitable for wide-range input and output applications and able to realize efficient power components for car infotainment systems. Samples are available.

High-accuracy Step-down DC-DC Converter
with 4.5A MOSFET

AP3440ABN

The AP3440ABN is a synchronous rectification PWM control step-down DC-DC converter of the current mode with excellent transient load response characteristics.

The recommended operational temperature ranges from −40 to 125ºC. It is capable for automotive use that demands high reliability.

The AP3440ABN is equipped with Output Over-Current Protection, Output Over-Voltage Protection, Under Voltage Lock Out, Thermal Protection, and Power-good function.

Supporting High Reliability Systems

The output voltage is constantly monitored by ±2% high precision power good function. When the output voltage is in an abnormal state, the AP3440 sends the error flag signal to microcomputers promptly. It supports a fail-safe environment with appropriate data saving processing.

Downsizing PCB

The AP3440 integrates a MOSFET that can supply maximum output current of 4.5A in a 5mm × 5mm 28-pin QFN package with a heat dissipation pad on the back surface. 2.1MHz operation helps miniaturizing peripheral components. Therefore, a printed circuit board can be downsized.

150℃ warranty

Electrical characteristics are guaranteed in Tj = -40 to 150℃, assuming operation environments that require high reliability.

Lineup

Step-down (Buck) DC-DC Converters

Part Number
Part
Status
Number of 
Outputs
Topology
Synchronous
Power MOSFET
Input Voltage 
(MIN.)
[V]
Input Voltage 
(TYP.)
[V]
Input Voltage 
(MAX.)
[V]
Output Voltage
[V]
Output Current
(MAX.)
[A]
Other
Operating
Temperature
[℃]
Device
Package
Number
of Pins
AP3440ABN122
MP
1
Step - down
Yes
Internal
4.1

                                
5.5
1.227
4.5
Automotive grade
-40 to 125
HWQFN
28
AP3440ABN182
MP
1
Step - down
Yes
Internal
4.1

                                
5.5
1.822
4.5
Automotive grade
-40 to 105
HWQFN
28
AP3440ABN111
MP
1
Step-down
Yes
Internal
4.1

                                
5.5
1.112
4.5
Automotive grade
-40 to 105
HWQFN
28