AP3440ABN111 Datasheet, PDF (1/17 Pages) Asahi Kasei Microsystems – High-Accurate Step-Down DC-DC Converter with 4.5A MOSFET

[AP3440]
AP3440ABN111
High-Accurate Step-Down
DC-DC Converter with 4.5A MOSFET
1. General Description
The AP3440 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 AP3440 supports input voltage from 4.1V to 5.5V and its output voltage is 1.112V. It integrates
power MOSFET corresponding to a 4.5A output current at the maximum. The AP3440 is equipped with
Output Over-Current Protection, Output Over-Voltage Protection, Under Voltage Lock Out, Thermal
Protection, and Power-good function. The AP3440 is housed in a 28-pin QFN0505 package.
2. Features
Input Voltage Range
: 4.1V ~ 5.5V
Output Voltage
Output Current Peak
: 1.112V (+2.07%, −1.80%)
: 4.5A
Oscillation Frequency
: 2100 kHz
External Synchronization (supporting Master/Slave mode), Frequency Range : 1800kHz ~ 2250kHz
Integrated Power MOSFET
Soft Start Function
High-Accurate Power-Good Function
Discharging Function of Output Capacitor
Protection Functions: Over Current, Over Voltage, Under Voltage Lock Out and Thermal Protections
Recommended Operational Temperature Range: Ta=−40 ~ 125ºC
Package: 28-pin QFN0505 (Exposed Pad and Pins are Plated)
PG
FSIN
EN
EN
SGND
SS
C4
CC
VO1
C3
VO2
C5
R1
AP3440
SW6
SW5
SW4
L1
SW3
SW2
SW1
NC
Vin
C1
Vout
C2
016008997-E-00
Figure 1. Application
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2016/10