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AP3440ABN182 Datasheet Preview

AP3440ABN182 Datasheet

High-Accurate Step-Down DC-DC Converter

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[AP3440]
AP3440ABN182
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 1.822V. 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
: 1.822V (+1.81%, 1.87%)
Output Current Peak
: 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)
016008997-E-00
Figure 1. Application
-1-
2016/10




AKM

AP3440ABN182 Datasheet Preview

AP3440ABN182 Datasheet

High-Accurate Step-Down DC-DC Converter

No Preview Available !

[AP3440]
3. Table of Contents
1. General Description ............................................................................................................................ 1
2. Features .............................................................................................................................................. 1
3. Table of Contents................................................................................................................................ 2
4. Block Diagram ..................................................................................................................................... 3
5. Ordering Guide.................................................................................................................................... 3
6. Pin Configurations and Functions....................................................................................................... 4
Pin Configurations ......................................................................................................................... 4
Functions ....................................................................................................................................... 4
7. Absolute Maximum Ratings ................................................................................................................ 5
8. Recommended Operating Conditions................................................................................................. 6
9. Electrical Characteristics..................................................................................................................... 7
10. Timing Chart........................................................................................................................................ 8
11. Functional Descriptions....................................................................................................................... 9
11.1 Normal Operation........................................................................................................................ 9
11.2 External Synchronous Function.................................................................................................. 9
11.3 Extrenal Synchronous Clock Output........................................................................................... 9
11.4 Power Good Function ................................................................................................................. 9
11.5 Over Voltage Protection (OVP)................................................................................................. 10
11.6 Under Voltage Lockout (UVLO)................................................................................................ 10
11.7 Over Current Protection (OCL: Over Current Limit) ................................................................. 10
11.8 Thermal Protection (TSD: Thermal Shut Down)....................................................................... 11
11.9 Output Capacitor Discharge ..................................................................................................... 11
12. Typical Characteristics...................................................................................................................... 12
13. Recommended External Circuits ...................................................................................................... 13
14. Layout Examples............................................................................................................................... 14
VIN Capacitor Wiring................................................................................................................... 14
GND Wiring.................................................................................................................................. 14
Switching Node Connection ........................................................................................................ 14
Soft Start Capacitor ..................................................................................................................... 14
15. Package ............................................................................................................................................ 15
Outline Dimensions ..................................................................................................................... 15
Recommended Land ................................................................................................................... 15
Marking ........................................................................................................................................ 15
16. Revision History ................................................................................................................................ 16
IMPORTANT NOTICE .......................................................................................................................... 17
016008997-E-00
-2-
2016/10



Part Number AP3440ABN182
Description High-Accurate Step-Down DC-DC Converter
Maker AKM
Total Page 3 Pages
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