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6A, 23V, 500kHz, ACOTTM Synchronous Buck Converter with LDO for System 3.3V

RT7290A

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The RT7290A is a synchronous Buck converter with Advanced Constant On-Time (ACOTTM) mode control. The main control loop of the RT7290A uses an ACOTTM mode control which provides a very fast transient response with no external compensators. The RT7290A operates from 5V to 23V input voltage, provides a 3.3V LDO and a 300kHz CLK to drive an external charge pump. OCP, UVP and OVP are included in the RT7290A. 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.
RT7290A
Status Active
Vin (min) (V) 5
Vin (max) (V) 23
Number of Outputs 1
Vout (min) (V) 3.267
Vout (max) (V) 3.333
Output Adj. Method Fixed
Iout (max) (A) 6
Freq (typ) (kHz) 500
Ext Sync No
Ron_HS (typ) (mOhm) 31
Ron_LS (typ) (mOhm) 20
Iq (typ) (mA) 0.1
Features ACOT Control;Built-in Bootstrap Switch;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;Fast Transient Response;Low Dropout;OCP;OVP;PSM;Power Good;Stable with Ceramic Capacitor;UVP
Package Type UQFN3x3-16(FC)
Features
  • 5V to 23V Input Voltage Range
  • PWM Frequency Fixed 500kHz
  • ACOTTM Mode Performs Fast Transient Response
  • Integrated MOSFETs
    ► 31mΩ of High-Side MOSFET
    ► 20mΩ of Low-Side MOSFET
  • Support Output MLCC Stable
  • Internal Soft-Start (1.5ms typ)
  • Built-in OVP/UVP/OCP
  • Power Good Indicator
  • Fixed 300kHz VCLK to Support Charge Pump
  • Individual EN for PWM and LDO
  • Thermal Shutdown
Datasheet
TitleLast UpdateShareDownload
6A, 23V, 500kHz, ACOTTM Synchronous Buck Converter with LDO for System 3.3V2015/05/19
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?2017/03/30 583
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2019/01/09
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