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8A, 23V, 500kHz Synchronous Step-Down Converter with 3.3V/5V LDO

RT7238B/RT7238C/RT7238D/RT7238E

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The RT7238B/C/D/E is an advanced constant on-time (ACOTTM) mode synchronous step-down converter. The main control loop of RT7238B/C/D/E using an advanced constant on-time (ACOTTM) mode control which provides a very fast transient response. The RT7238B/C/D/E operates from 8V to 23V input voltage. For the RT7238D, the output voltage can be adjusted between 0.6V to 5V.

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.
RT7238B RT7238C RT7238D RT7238E
Status Active Active Active Active
Vin (min) (V) 8 8 8 8
Vin (max) (V) 23 23 23 23
Number of Outputs 2 2 2 2
Vout (min) (V) 3.35 5.1 0.6 5
Vout (max) (V) 3.35 5.1 5 5
Preset Vout (V)
Output Adj. Method Fixed Fixed Resistor Fixed
Iout (max) (A) 8 8 8 8
Current Limit (typ) (A) 9 9 12 9
Freq (typ) (kHz) 500 500 500 500
Freq (min) (kHz) 450 450 450 450
Freq (max) (kHz) 550 550 550 550
Ext Sync No No No No
Ron_HS (typ) (mOhm) 27 27 27 27
Ron_LS (typ) (mOhm) 10 10 10 10
Iq (typ) (mA) 0.11 0.11 0.11 0.11
Features ACOT Control;Adjustable Current Limit;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;Fast Transient Response;Low Dropout;OVP;PSM;Power Good;Stable with Ceramic Capacitor;UVP ACOT Control;Adjustable Current Limit;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;Fast Transient Response;Low Dropout;OVP;PSM;Power Good;Stable with Ceramic Capacitor;UVP ACOT Control;Adjustable Current Limit;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;Fast Transient Response;Low Dropout;OVP;PSM;Power Good;Stable with Ceramic Capacitor;UVP ACOT Control;Adjustable Current Limit;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;Fast Transient Response;Low Dropout;OVP;PSM;Power Good;Stable with Ceramic Capacitor;UVP
Package Type UQFN3x3-10(FC) UQFN3x3-10(FC) UQFN3x3-10(FC) UQFN3x3-10(FC)
Features
  • Advanced Constant On-Time (ACOT) Control
  • 8V to 23V (RT7238B/C/D/E) Input Voltage Range @ 8A Output Current
  • ACOTTM Mode Performs Fast Transient Response
  • ACOTTM Architecture to Enable all MLCC Output Capacitor Usage
  • Fixed 500kHz Switching Frequency
  • High Efficient Internal Power MOSFET Switch
    ► 27mΩ (High-Side) and 10mΩ (Low-Side)
  • Adjustable Output Voltage from 0.6V to 5V (RT7238D)
  • Fixed 3.3V (RT7238B/D) or 5V (RT7238C/E) LDO Output Supplies 70mA
  • Pre-biased Soft-Start
  • Cycle-by-Cycle Over-Current Protection
  • Input Under-Voltage Lockout
  • Thermal Shutdown
  • Output Over/Under-Voltage Protection
Datasheet
TitleLast UpdateShareDownload
8A, 23V, 500kHz Synchronous Step-Down Converter with 3.3V/5V LDO2015/06/25
Technical Documents
TitleLast UpdateShareDownload
ACOT™ Stability Testing2019/03/18
ACOT™ (Advanced Constant-On Time) Synchronous Step-Down Converters2018/11/15
Richtek Wide Input Voltage Range DC/DC Power Solutions for Industrial, Automotive and LED lighting applications2018/11/01
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?2017/03/30 522
Evaluation Boards
TitleLast UpdateShareDownload
Synchronous Step-Down Converter’s Evaluation Board for RT7238 Integrated Chip2018/11/01
Synchronous Step-Down Converter’s Evaluation Board for RT7238 Integrated Chip2018/11/01
Synchronous Step-Down Converter’s Evaluation Board for RT7238 Integrated Chip2018/11/01
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2018/11/01
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT7238BGQUFUQFN3x3-10(FC)1500 Not available Buy from Distributor
RT7238CGQUFUQFN3x3-10(FC)1500 Not available Buy from Distributor
RT7238DGQUFUQFN3x3-10(FC)1500 Not available Buy from Distributor
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