FEATURES
• Wide 4.5V to 28V Input Voltage Range
• 1.5A Output Current (12VIN to 5VOUT)
• Output Adjustable Down to 0.81V
• 0.3Ω 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
APPLICATIONS
• TFT LCD Monitors
• Portable DVD, Headphones, MP3 Players, etc.
• Car-Powered or Battery-Powered Equipment
• Set-Top Boxes
• Telecom Power Supplies
• DSL and Cable Modems and Routers
TYPICAL APPLICATION CIRCUIT
ACT4088
28V, 1.5A, 1.4MHz Step-Down
DC/DC Converter in SOT23-6
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 compensation
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.
4.5V to 28V
VIN
IN
BST
ON
OFF
SW
EN
FB
G
VOUT
Data Sheet Rev. 3.0, Nov. 13, 2019 | Subject to change without notice
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