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Part Number: ACT4088

 

MFG: ACT

Package Cooled: 09+

 

Description: The ACT4088 is a current-mode step-down DC/DC converter that supplies up to 1.5A into 5V from a 12V in...


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ACT4088 General Description


The ACT4088 is a current-mode step-down DC/DC converter that supplies up to 1.5A into 5V from a 12V input. 1.4MHz switching frequency allows the use of tiny external components, and internal loop  ompensation provides simple, stable power supplies with a minimum of external components. Optimized for use with ceramic input and output capacitors, the ACT4088 provides a very compact 1.5A power supply for space constrained mobile and consumer applications.

The ACT4088 operates over a wide input voltage range and utilizes current-mode operation to provide excellent line and load transient response while requiring no external compensation components. Fault protection includes cycle-by-cycle current limiting, frequency fold-back, hiccup mode, and thermal shutdown. Internal soft-start provides a controlled startup with no overshoot, even at light loads.

The ACT4088 is available in a tiny SOT23-6 package and requires very few external components.

ACT4088 Maximum Ratings

PARAMETER
VALUE
UNIT
IN Supply Voltage
SW Voltage
BST Voltage
EN, FB Voltage
Continuous SW Current
Junction to Ambient Thermal Resistance ( JA)
Maximum Power Dissipation
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10 sec)
-0.3 to 32
-1 to VIN + 1
VSW - 0.3 to VSW + 7
-0.3 to 6
Internally Limited
220
0.5
-40 to 150
-55 to 150
300
V
V
V
V
A
°C/W
W
°C
°C
°C

: Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating conditions for long periods may affect device reliability.

ACT4088 Features

` Wide 4.5V to 28V Input Voltage Range
` 1.5A Output Current (12VIN to 5VOUT)
` Output Adjustable Down to 0.81V
` 0.3 Internal Power MOSFET
` Up to 92% Efficiency
` Stable with Low ESR Ceramic Output Capacitors
` Fixed 1.4MHz Operating Frequency
` Internal Soft-Start Function
` Over Current Protection with Hiccup-Mode
` Thermal Shutdown
` Available in a SOT23-6 Package

ACT4088 Typical Application

· TFT LCD Monitors
· Portable DVDs, Headphones, MP3 Players, etc.
· Car-Powered or Battery-Powered Equipment
· Set-Top Boxes
· Telecom Power Supplies
· DSL and Cable Modems and Routers

ACT4088 Connection Diagram

ACT4088 Connection Diagram

ACT4088 datasheet

ACT4088US-T
PDF/DataSheet Download

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