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3A, 18V, 500kHz, ACOT™ Step-Down Converter

RT6234A/RT6234B

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The RT6234A/B is a high-efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 3A output current from a 4.5V to 18V input supply. The RT6234A/B adopts ACOT architecture to allow the transient response to be improved and keep in constant frequency. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. Fault conditions also include output under voltage protection and thermal shutdown.

Applications

  • Set Top Box
  • Portable TV
  • Access Point Router
  • DSL Modem
  • LCD TV
Key Spec.
RT6234A RT6234B
Status Active Active
Vin (min) (V) 4.5 4.5
Vin (max) (V) 18 18
Number of Outputs 1 1
Vout (min) (V) 0.8 0.8
Vout (max) (V) 6.5 6.5
Preset Vout (V)
Output Adj. Method Resistor Resistor
Iout (max) (A) 3 3
Current Limit (typ) (A) 4.8 4.8
Freq (typ) (kHz) 500 500
Freq (min) (kHz)
Freq (max) (kHz)
Ext Sync No No
Ron_HS (typ) (mOhm) 130 130
Ron_LS (typ) (mOhm) 70 70
Iq (typ) (mA) 0.8 0.8
Features ACOT Control;PSM ACOT Control;Force PWM
Package Type WDFN2x3-8 WDFN2x3-8
Features
  • Integrated 130mΩ / 70mΩ MOSFETs
  • 4.5V to 18V Supply Voltage Range
  • 500kHz Switching Frequency
  • ACOT Control
  • 0.8V ± 2% Voltage Reference
  • Output Adjustable from 0.8V to 6.5V
  • Monotonic Start-Up into Pre-Biased Outputs
Datasheet
TitleLast UpdateShareDownload
3A, 18V, 500kHz, ACOT™ Step-Down Converter2016/01/29
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?2017/03/30 522
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2018/11/01
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT6234AHGQWWDFN2x3-81500 Not available Buy from Distributor
RT6234BHGQWWDFN2x3-81500 Request Buy from Distributor
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