6V Input, 1A, ACOT™ Buck Converter in SOT-563 with Both FETs OC Protection


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The RT5760 is a simple, easy-to-use, 1A synchronous step-down DC-DC converter with an input supply voltage range of 2.5V to 6V. The device build-in an accurate 0.6V reference voltage and integrates low RDS(ON) power MOSFETs to achieve high efficiency in a SOT-563 (FC) package.The RT5760 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 RT5760A operates in automatic PSM that maintains high efficiency during light load operation. The RT5760B operates in Forced PWM that helps meet tight voltage regulation accuracy requirements.The RT5760 senses both FETs current for a robust over-current protection. The device features cycle-by-cycle current limit protection and prevent the device from the catastrophic damage in output short circuit, over current or inductor saturation. A built-in 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 RT5760 is offered in a SOT-563 (FC) package.


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  • General Purpose for POL LV Buck Converter
Key Spec.
RT5760A RT5760B
Status Active Active
Vin (min) (V) 2.5 2.5
Vin (max) (V) 6 6
Number of Outputs 1 1
Vout (min) (V) 0.6 0.6
Vout (max) (V) 3.8 3.8
Preset Vout (V)
Output Adj. Method Resistor Resistor
Iout (max) (A) 1 1
Current Limit (typ) (A) 1.55 1.55
Freq (typ) (kHz) 2200 2200
Freq (min) (kHz)
Freq (max) (kHz)
Ext Sync No No
Ron_HS (typ) (mOhm) 120 120
Ron_LS (typ) (mOhm) 80 80
Iq (typ) (mA) 0.025 0.3
Features 100% Duty Cycle;ACOT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;Internal Compensation;OCP;OTP;PSM;Power Good;Stable with Ceramic Capacitor;UVP 100% Duty Cycle;ACOT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;Force PWM;Internal Compensation;OCP;OTP;Power Good;Stable with Ceramic Capacitor;UVP
Package Type SOT-563(FC) SOT-563(FC)
  • 1A Converter Integrated 120mΩ and 80mΩ FETs in Small SOT-563 (FC) Package
  • Input Supply Voltage Range : 2.5V to 6V
  • Output Voltage Range : 0.6V to VIN
  • Advanced Constant On-Time (ACOTTM) Control
    ► Ultrafast Transient Response
    ► No Needs for External Compensations
    ► Optimized for Low-ESR Ceramic Output Capacitors
  • High Accuracy Feedback Reference Voltage : 0.6V±1%
  • Both HS/LS FETs Protection for Robust Over-Current Protection
  • Optional for Operation Modes :
    ► Automatically Power Saving Mode (PSM) (RT5760A)
    ► Forced PWM Mode (RT5760B)
  • Fixed Switching Frequency : 2.2MHz
  • Internally Fixed Soft-Start (typ. 0.6ms)
  • Safe Start-Up from Pre-biased Output
  • Input Under-Voltage Lockout (UVLO)
  • Output Under-Voltage Protection (UVP) with Hiccup Mode
  • Over-Temperature Protection (OTP) (Thermal Shutdown)
  • Enable Control
  • Power Good Indication
  • RoHS Compliant and Halogen Free
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6V Input, 1A, ACOT™ Buck Converter in SOT-563 with Both FETs OC Protection2019/05/10
Reference Design
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Richtek Load Transient Tool2018/11/01