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4A, 23V, 500kHz, ACOTTM Synchronous Buck Converter

RT6219

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The RT6219 is a synchronous Buck converter with Advanced Constant On-Time (ACOTTM) mode control which provides a very fast transient response with no external compensators. The RT6219 operates from 5V to 23V input voltage, provides complete protection functions including Over Current Protection(OCP), Under Voltage Protection (UVP) and Over Voltage Protection (OVP). This IC also provides a 1.5ms internal soft-start function and an open-drain power good indicator.

Applications

  • Laptop Computers
  • Tablet PCs
  • Networking Systems
  • Servers
  • Personal Video Recorders
  • Flat Panel Television and Monitors
  • Distributed Power Systems
Key Spec.
RT6219A RT6219B
Status Active Active
Vin (min) (V) 5 5
Vin (max) (V) 23 23
Number of Outputs 1 1
Vout (min) (V) 0.6 0.6
Vout (max) (V) 5 5
Output Adj. Method Resistor Resistor
Iout (max) (A) 4 4
Current Limit (typ) (A) 6 6
Freq (typ) (kHz) 500 500
Ext Sync No No
Ron_HS (typ) (mOhm) 67 67
Ron_LS (typ) (mOhm) 41 41
Iq (typ) (mA) 0.1 0.11
Features ACOT Control;Built-in Bootstrap Switch;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;Fast Transient Response;OCP;OVP;PSM;Power Good;Stable with Ceramic Capacitor;UVP ACOT Control;Built-in Bootstrap Switch;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;Fast Transient Response;Force PWM;OCP;OVP;Power Good;Stable with Ceramic Capacitor;UVP
Package Type WDFN3x3-10 WDFN3x3-10
Features
  • 5V to 23V Input Voltage Range
  • Adjustable from 0.6V to 5V Output Range
  • Up to 98% Duty for 2S Battery Application
  • 500kHz Switching Frequency
  • ACOTTM Mode Performs Fast Transient Response
  • Integrated MOSFETs
    ► 67mΩ of High-Side MOSFET
    ► 41mΩ of Low-Side MOSFET
  • Supports MLCC Output Capacitors
  • Internal Soft-Start (1.5ms typ)
  • Built-in OVP/UVP/OCP
  • Power Good Indicator
  • Thermal Shutdown
Datasheet
TitleLast UpdateShareDownload
4A, 23V, 500kHz, ACOTTM Synchronous Buck Converter2018/01/09
Technical Documents
TitleLast UpdateShareDownload
ACOT™ Stability Testing2019/03/18
ACOT™ (Advanced Constant-On Time) Synchronous Step-Down Converters2018/11/15
Comparing Buck Converter Topologies2018/09/20
Buck Converter Selection Criteria2016/08/04
The Calculation of Output DC Offset for ACOT™ Control Buck Converter with Feed-forward Compensator2016/07/07
Videos
TitleLast UpdateShareViews
How to estimate control loop bandwidth from the transient response time?2017/03/30 628
Evaluation Boards
TitleLast UpdateShareDownload
4A, 23V, 500kHz, ACOT™ Synchronous Buck Converter2018/11/08
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2019/01/09
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT6219AGQWWDFN3x3-101500 Not available Buy from Distributor
RT6219AHGQWWDFN3x3-101500 Not available Buy from Distributor
RT6219BHGQWWDFN3x3-101500 Not available Buy from Distributor
RT6219BLGQWWDFN3x3-101500 Not available Buy from Distributor
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