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4A, 18V, 650kHz, ACOT® Synchronous Step-Down Converter

RT6201A/RT6201B

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The RT6201A/B 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 4A 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, RT6201A/B 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 a valley detection of low side MOSFET and external soft-start setting eliminates input current surge during startup. Protection functions include thermal shutdown for RT6201A/B.

The RT6201A/B are available in the SOP-8 (Exposed Pad) package.

Applications

  • Industrial and Commercial Low Power Systems
  • Computer Peripherals
  • LCD Monitors and TVs
  • Green Electronics/Appliances
  • Point of Load Regulation for High-Performance DSPs, FPGAs, and ASICs
Key Spec.
RT6201A RT6201B
Status Active Active
Vin (min) (V) 4.5 4.5
Vin (max) (V) 18 18
Vout (min) (V) 0.765 0.765
Vout (max) (V) 8 8
Output Adj. Method Resistor Resistor
Iout (max) (A) 4 4
Current Limit (typ) (A) 5.4 5.4
Freq (typ) (kHz) 650 650
Ext Sync No No
Ron_HS (typ) (mOhm) 120 120
Ron_LS (typ) (mOhm) 50 50
Iq (typ) (mA) 1 1
Features ACOT Control;OCP;PSM ACOT Control;Force PWM;OCP
Package Type PSOP-8 PSOP-8
Features
  • ACOTTM Mode Enables Fast Transient Response
  • 4.5V to 18V Input Voltage Range
  • 4A Output Current
  • 50mΩ Internal Low Side N-MOSFET
  • Advanced Constant On-Time Control
  • Support All Ceramic Capacitors
  • Up to 95% Efficiency
  • 650kHz Switching Frequency at all Load Current (RT6201B)
  • Discontinuous Operating Mode at Light Load (RT6201A)
  • Adjustable Output Voltage from 0.765V to 8V
  • Adjustable Soft-Start
  • Cycle-by-Cycle Current Limit
  • Input Under Voltage Lockout
  • Thermal Shutdown
  • RoHS Compliant and Halogen Free
Datasheet
TitleLast UpdateShareDownload
4A, 18V, 650kHz, ACOT® Synchronous Step-Down Converter2013/10/23
Technical Documents
TitleLast UpdateShareDownload
ACOT® Stability Testing2020/04/13
The Calculation of Output DC Offset for ACOT™ Control Buck Converter with Feed-forward Compensator2019/12/12
ACOT™ (Advanced Constant-On Time) Synchronous Step-Down Converters2019/12/12
Comparing Buck Converter Topologies2019/12/12
Buck Converter Selection Criteria2019/12/12
Videos
TitleLast UpdateShareViews
How to estimate control loop bandwidth from the transient response time?2017/03/30 786
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT6201AHGSPPSOP-82500 Not available Buy from Distributor
RT6201BHGSPPSOP-82500 Not available Buy from Distributor
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