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

RT5797B

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The RT5797B 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 RT5797B is available in the WDFN-8L 2x2 package.

Applications

  • STB, Cable Modem, & xDSL Platforms
  • LCD TV Power Supply & Metering Platforms
  • General Purpose Point of Load (POL)
  • Internet of Things
Key Spec.
RT5797B
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
Preset Vout (V)
Output Adj. Method Resistor
Iout (max) (A) 3
Current Limit (typ) (A) 3.7
Freq (typ) (kHz) 1000
Freq (min) (kHz)
Freq (max) (kHz)
Ext Sync No
Ron_HS (typ) (mOhm) 100
Ron_LS (typ) (mOhm) 70
Iq (typ) (mA) 0.3
Features Force PWM;OCP;OVP;UVP
Package Type WDFN2x2-8
Features
  • Efficiency Up to 95%
  • RDSON 100mΩ HS / 70mΩ LS
  • VIN Range 2.7V to 6V
  • VREF 0.6V with ±1% Accuracy at 25°C
  • CMCOT™ Control Loop Design for Best Transient Response, Robust Loop Stability with Low-ESR (MLCC) COUT
  • Soft-Start 1.2ms
Datasheet
TitleLast UpdateShareDownload
3A, 1MHz, 6V CMCOT Synchronous Step-Down Converter2016/01/29
Videos
TitleLast UpdateShareViews
How to estimate control loop bandwidth from the transient response time?2017/03/30 522
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2018/11/01
Design Tool
TitleLast UpdateShare
Richtek Designer™ Web Simulation Tool : RT5797BHGQW2019/04/16
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT5797BHGQWWDFN2x2-82500 Request Buy from Distributor
RT5797BLGQWWDFN2x2-82500 Not available Buy from Distributor
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