3A, 1MHz, 6V CMCOT Synchronous Step-Down Converter


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The RT5797A is a high efficiency synchronous step-down DC/DC converter. Its input voltage range is from 2.7V to 6V and provides an adjustable regulated output voltage from 0.6V to 3.4V while delivering up to 3A of output current.

The internal synchronous low on-resistance power switches increase efficiency and eliminate the need for an external Schottky diode. The Current Mode Constant-On-time (CMCOT) operation with internal compensation allows the transient response to be optimized over a wide range of loads and output capacitors. The RT5797A is available in the WDFN-8L 2x2 and WDFN-8SL 2x2 packages.


Key Spec.
Status Active
Vin (min) (V) 2.7
Vin (max) (V) 6
Number of Outputs 1
Vout (min) (V) 0.6
Vout (max) (V) 3.4
Output Adj. Method Resistor
Iout (max) (A) 3
Current Limit (typ) (A) 3.7
Freq (typ) (kHz) 1000
Ext Sync No
Ron_HS (typ) (mOhm) 100
Ron_LS (typ) (mOhm) 70
Iq (typ) (mA) 0.022
Features Enable Input;Fast Transient Response;Internal Compensation;OCP;OVP;PSM;Power Good;UVP
Package Type WDFN2x2-8;WDFN2x2-8S
  • Efficiency Up to 95%
  • RDS(ON) 100mΩ HS / 70mΩ LS
  • VIN Range 2.7V to 6V
  • VREF 0.6V with ±1% Accuracy at 25ºC
  • CMCOTTM Control Loop Design for Best Transient Response, Robust Loop Stability with Low-ESR (MLCC) COUT
  • Soft-Start 1.2ms
  • Power Saving in Light Load
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3A, 1MHz, 6V CMCOT Synchronous Step-Down Converter2016/04/06
Technical Documents
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Richtek Selection Guide [Oct., 2020]2020/12/30
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How to estimate control loop bandwidth from the transient response time?2017/03/30 1357
Evaluation Boards
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3A, 1MHz, 6V CMCOT Synchronous Step-Down Converter2021/01/21
Reference Design
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Richtek Load Transient Tool2021/01/21
Design Tool
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Richtek Designer™ Web Simulation Tool : RT5797AHGQW2020/09/23
Richtek Designer™ Web Simulation Tool : RT5797ALGQW2020/09/23
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT5797AHGQWWDFN2x2-82500 Not available Not available
RT5797AHGQWAWDFN2x2-8S2500 Request Buy from Distributor
RT5797ALGQWWDFN2x2-82500 Request Buy from Distributor