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24V, 3A, 800kHz, ACOTTM Step-Down Converter in 8 Pin TSOT-23

RT6217F

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The RT6217F is a simple, easy-to-use, 3A synchronous step-down DC-DC converter with an input supply voltage range of 4.5V to 24V. The device build-in an accurate 0.791V reference voltage and integrates low RDS(ON) power MOSFETs to achieve high efficiency in a TSOT-23-8 (FC) package.

The RT6217F adopts Advanced Constant On-Time (ACOTTM) control architecture to provide an ultrafast transient response with few external components and to operate in nearly constant switching frequency over the line, load, and output voltage range. The RT6217F has MODE Selection function. To connect MODE pin to ground to force the RT6217F into Pulse Skipping Mode for light load efficiency improvement. Pulling the MODE pin high (i.e. > 2V) will force the RT6217F into CCM that helps meet tight voltage regulation accuracy requirements.

The RT6217F senses both FETs current for a robust over-current protection. It features cycle-by-cycle current limit protection and prevent the device from the catastrophic damage in output short circuit, over current or inductor saturation. An internally soft-start function prevents inrush current during start-up. The device also includes input under-voltage lockout, output under-voltage protection, and over-temperature protection (thermal shutdown) to provide safe and smooth operation in all operating conditions. The RT6217F is offered in a TSOT-23-8 (FC) package.

Applications

  • Set Top Box
  • Portable TV
  • Access Point Router
  • DSL Modem
  • LCD TV
Key Spec.
RT6217F
Status Active
Vin (min) (V) 4.5
Vin (max) (V) 24
Number of Outputs 1
Vout (min) (V) 0.791
Vout (max) (V) 6
Output Adj. Method Resistor
Iout (max) (A) 3
Current Limit (typ) (A) 4.2
Freq (typ) (kHz) 800
Ext Sync No
Ron_HS (typ) (mOhm) 85
Ron_LS (typ) (mOhm) 40
Iq (typ) (mA) 0.15
Features ACOT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;OCP;Selectable (PSM or PWM);Stable with Ceramic Capacitor;UVP
Package Type TSOT-28(FC)
Features
  • 3A Converter With Built-in 85mΩ/40mΩ Low RDS(ON) Power FETs
  • Input Supply Voltage Range : 4.5V to 24V
  • Output Voltage Range : 0.791V to 6V
  • Advanced Constant On-Time (ACOTTM) Control
  • Ultrafast Transient Response
  • No Needs For External Compensations
  • Optimized for Low-ESR Ceramic Output Capacitors
  • 0.791V ±1.5% High-Accuracy Feedback Reference Voltage
  • Low Quiescent Current (150μA typ.)
  • Both HS/LS FETs Protection for Robust Over-Current Protection
  • Selectable Power Saving Mode (PSM) or Force PWM Mode
  • Light-load VOUT Ripple Reduction Technology in PSM
  • Steady Switching Frequency (800kHz typ.)
  • Internally Soft-Start Function (1500μs typ.)
  • Monotonic Start-up for Pre-biased Output
  • Input Under-Voltage Lockout (UVLO)
  • Output Under-Voltage Protection (UVP) with Hiccup Mode
  • Over-Temperature Protection (OTP) (Thermal Shutdown)
  • Enable Control
  • RoHS Compliant and Halogen Free
  • Available In TSOT-23-8 (FC) Package
Datasheet
TitleLast UpdateShareDownload
24V, 3A, 800kHz, ACOTTM Step-Down Converter in 8 Pin TSOT-232015/11/27
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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