ACT4088 28V, 1.5A, 1.4MHz Step-Down DC/DC Converter in SOT23-6 FEATURES GENERAL DESCRIPTION Wide 4.5V to 28V Input Voltage Range The ACT4088 is a current-mode step-down DC/DC converter that supplies up to 1.5A into 5V from a 12V 1.5A Output Current (12VIN to 5VOUT) input. 1.4MHz switching frequency allows the use of tiny Output Adjustable Down to 0.81V external components, and internal loop compensation 0.3 Internal Power MOSFET provides simple, stable power supplies with a minimum Up to 92% Efficiency of external components. Optimized for use with ceramic Stable with Low ESR Ceramic Output Capacitors input and output capacitors, the ACT4088 provides a Fixed 1.4MHz Operating Frequency very compact 1.5A power supply for space constrained mobile and consumer applications. Internal Soft-Start Function Over Current Protection with Hiccup-Mode The ACT4088 operates over a wide input voltage range Thermal Shutdown and utilizes current-mode operation to provide excellent line and load transient response while requiring no Available in a SOT23-6 Package external compensation components. Fault protection includes cycle-by-cycle current limiting, frequency fold- APPLICATIONS back, hiccup mode, and thermal shutdown. Internal soft-start provides a controlled startup with no overshoot, TFT LCD Monitors even at light loads. Portable DVD, Headphones, MP3 Players, etc. The ACT4088 is available in a tiny SOT23-6 package Car-Powered or Battery-Powered Equipment and requires very few external components. Set-Top Boxes Telecom Power Supplies DSL and Cable Modems and Routers TYPICAL APPLICATION CIRCUIT 4.5V to 28V V IN BST IN V SW OUT ON EN OFF FB G Data Sheet Rev. 3.0, Nov. 13, 2019 Subject to change without notice 1 of 12 www.qorvo.com ACT4088 28V, 1.5A, 1.4MHz Step-Down DC/DC Converter in SOT23-6 ORDERING INFORMATION PART NUMBER TEMPERATURE RANGE PACKAGE PINS PACKING TOP MARK ACT4088US-T -40C to 85C SOT23-6 6 TAPE & REEL FRWJ ACT4088US-T8082 -40C to 85C SOT23-6 6 TAPE & REEL FRWJ PIN CONFIGURATION 1 6 SW BST 2 5 IN ACT4088 G 3 4 EN FB SOT23-6 PIN DESCRIPTIONS PIN NUMBER NAME DESCRIPTION 1 SW Switch Output. Connect this pin to the switching end of the inductor. Power supply input. Bypass this pin with a 10F ceramic capacitor to G, placed as close to the IC 2 IN as possible. Enable Input. EN is pulled up to 5V with a 2A 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. Feedback Input. The voltage at this pin is regulated to 0.81V. Connect to the center point of a 4 FB resistive voltage-divider between OUT and G to set the output voltage. Ground and Heat sink. Connect this pin to a large, uncovered PCB copper area for best heat 5 G dissipation. Bootstrap. This pin acts as the power supply for the high-side switchs gate driver. Connect a 22nF 6 BST 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