The RT6262A/B is a simple, easy-to-use, 2A synchronous step-down DC-DC converter with an input supply voltage range of 4.5V to 17V. The device possesses an accurate reference voltage and integrates low RDS(ON) power MOSFETs to achieve high efficiency.

The RT6262A/B adopts Advanced Constant On-Time (ACOT®) 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 RT6262A operates in automatic PSM that maintains high efficiency during light load operation. The RT6262B operates in Forced PWM that helps meet tight voltage regulation accuracy requirements.

The RT6262A/B senses both FETs current for a robust over-current protection (OCP). The device features cycle-by-cycle current limit protection to prevent the device from the catastrophic damage in output short circuit, over-current or inductor saturation conditions. The RT6262A/B offers programmable start-up by connecting a capacitor at external SS pin. The device also includes input under-voltage lockout, output under-voltage protection, and over-temperature protection (OTP) to provide safe and smooth operation in all operating conditions.

The recommended junction temperature range is -40°C to 125°C.


  • Set-Top Boxes
  • LCD TVs
  • Home Networking Devices
  • Surveillance
  • General Purpose
Key Spec.
RT6262A RT6262B
Status Active Active
Vin (min) (V) 4.5 4.5
Vin (max) (V) 17 17
Number of Outputs 1 1
Vout (min) (V) 0.765 0.765
Vout (max) (V) 7 7
Output Adj. Method Resistor Resistor
Iout (max) (A) 2 2
Current Limit (typ) (A) 3.2 3.2
Freq (typ) (kHz) 650 650
Ext Sync No No
Ron_HS (typ) (mOhm) 125 125
Ron_LS (typ) (mOhm) 56 56
Iq (typ) (mA) 0.18 0.18
Features ACOT Control;Adjustable Soft-Start;COT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;OCP;OTP;PSM;Power Good;SCP;Stable with Ceramic Capacitor;UVP ACOT Control;Adjustable Soft-Start;COT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;OCP;OTP;Power Good;SCP;Stable with Ceramic Capacitor;UVP
Package Type TSOT-28(FC) TSOT-28(FC)
  • 2A Converter Integrated 125mΩ and 56mΩ FETs
  • Input Supply Voltage Range : 4.5V to 17V
  • Output Voltage Range : 0.765V to 7V
  • Advanced Constant On-Time (ACOT®) Control
    ► Ultrafast Transient Response
    ► Optimized for Low-ESR Ceramic Output Capacitors
  • High Accuracy Feedback Reference Voltage : Typ. ±1%
  • Optional for Operation Modes :
    ► RT6262A : Power Saving Mode (PSM)
    ► RT6262B : Forced PWM Mode
  • Fixed Switching Frequency : 650kHz
  • Enable Control and Externally Adjustable Soft-Start
  • Input Under-Voltage Lockout (UVLO)
  • Protection Function
    ► Output Under-Voltage Protection (UVP) with Hiccup Mode
    ► High- / Low-side MOSFET OCP and OTP Function
  • Power Good Indication
  • RoHS Compliant and Halogen Free
TitleLast UpdateDownload
17V Input, 2A, ACOT® Buck Converter with Both FETs OC Protection2020/08/18
Technical Documents
TitleItem TypeLast UpdateDownload
Richtek Product Selection Guide [Jan., 2024] Selection Guide2024/01/18
A Simple Way to Test Buck Converter Stability App. Note2023/10/11
Richtek Featured Product Tree [Aug., 2023] Selection Guide2023/08/07
Reference Design
TitleLast UpdateDownload
Richtek Load Transient Tool2022/07/25
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT6262BHGJ8FTSOT-28(FC)3000 Request Buy from Distributor