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RT7240

Richtek
Part Number RT7240
Manufacturer Richtek
Description Synchronous Step-Down Converter
Published Sep 20, 2013
Detailed Description Reference Design Sample & Design Tools Buy ® RT7235/36/39/40 5A, 18V, 650kHz, ACOT® Synchronous Step-Down Conver...
Datasheet PDF File RT7240 PDF File

RT7240
RT7240

Overview
Reference Design Sample & Design Tools Buy ® RT7235/36/39/40 5A, 18V, 650kHz, ACOT® Synchronous Step-Down Converter General Description The RT7235/36/39/40 is a synchronous step-down DC/ DC converter with Advanced Constant On-Time (ACOT®) mode control.
It achieves high power density to deliver up to 5A output current from a 4.
5V to 18V input supply.
The proprietary ACOT® mode offers an optimal transient response over a wide range of loads and all kinds of ceramic capacitors, which allows the device to adopt very low ESR output capacitor for ensuring performance stabilization.
In addition, RT7235/36/39/40 keeps an excellent constant switching frequency under line and load variation and the integrated synchronous power switches with the ACOT® mode operation provides high efficiency in whole output current load range.
Cycle-by-cycle current limit provides an accurate protection by detection of low-side MOSFET and external soft-start setting eliminates input current surge during startup.
Protection functions include thermal shutdown for RT7235/36/39/40, output undervoltage protection (UVP) / overvoltage protection (OVP) for RT7235/36.
When the UVP/OVP is triggered, the device will enter latch mode for TSSOP-14 (Exposed Pad), and hiccup mode for WDFN-10L 3x3.
The RT7235/36 are available in TSSOP-14 (Exposed Pad) and WDFN-10L 3x3 packages, and the RT7235 is operated in forced continuous conduction mode.
The RT7239/40 are available in the SOP-8 (Exposed Pad) package, and the RT7239 is operated in forced continuous conduction mode.
Features  ACOT® Mode Enables Fast Transient Response  4.
5V to 18V Input Voltage Range  5A Output Current  35mΩ Internal Low Site N-MOSFET  Advanced Constant On-Time Control  Support All Ceramic Capacitors  Up to 95% Efficiency  650kHz Switching Frequency at all Load Current (RT7235, RT7239)  Discontinuous Operating Mode at Light Load (RT7236, RT7240)  Adjustable Output Voltage from 0.
765V to 8V  Adjustable Soft-Start  Cycle-...


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