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Qorvo

ACT4088US-T8082 Datasheet Preview

ACT4088US-T8082 Datasheet

1.4MHz Step-Down DC/DC Converter

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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
1 of 12
www.qorvo.com




Qorvo

ACT4088US-T8082 Datasheet Preview

ACT4088US-T8082 Datasheet

1.4MHz Step-Down DC/DC Converter

No Preview Available !

ORDERING INFORMATION
PART NUMBER
ACT4088US-T
ACT4088US-T8082
TEMPERATURE RANGE
-40°C to 85°C
-40°C to 85°C
PACKAGE
SOT23-6
SOT23-6
PIN CONFIGURATION
ACT4088
28V, 1.5A, 1.4MHz Step-Down
DC/DC Converter in SOT23-6
PINS
6
6
PACKING
TAPE & REEL
TAPE & REEL
TOP MARK
FRWJ
FRWJ
SW
1
6 BST
IN 2 ACT4088 5 G
EN
3
4 FB
SOT23-6
PIN DESCRIPTIONS
PIN NUMBER NAME
DESCRIPTION
1
SW Switch Output. Connect this pin to the switching end of the inductor.
2
IN
Power supply input. Bypass this pin with a 10µF ceramic capacitor to G, placed as close to the IC
as possible.
Enable Input. EN is pulled up to 5V with a 2µA current, and contains a precise 1.24V logic
3
EN threshold. Drive this pin to a logic-high or leave unconnected to enable the IC. Drive to a logic-low
to disable the IC and enter micro-power shutdown mode.
4
FB
Feedback Input. The voltage at this pin is regulated to 0.81V. Connect to the center point of a
resistive voltage-divider between OUT and G to set the output voltage.
5
G
Ground and Heat sink. Connect this pin to a large, uncovered PCB copper area for best heat
dissipation.
6
BST
Bootstrap. This pin acts as the power supply for the high-side switch’s gate driver. Connect a 22nF
capacitor between this pin and SW.
Data Sheet Rev. 3.0, Nov. 13, 2019 | Subject to change without notice
2 of 12
www.qorvo.com


Part Number ACT4088US-T8082
Description 1.4MHz Step-Down DC/DC Converter
Maker Qorvo
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