RT7291A/RT7291B

6A, 23V, 500kHz, ACOT® Synchronous Buck Converter with LDO for System 5V

RT7291A/RT7291B
New

The RT7291A/B is a synchronous Buck converter with Advanced Constant On-Time (ACOT®) mode control. The main control loop of the RT7291A/B uses an ACOT® mode control which provides a very fast transient response with no external compensators. The RT7291A/B operates from 5V to 23V input voltage, provides a 5V LDO and a 300kHz CLK to drive an external charge pump. OCP, UVP and OVP are included in the RT7291A/B. This IC also provides a 1.5ms internal soft-start function and an open-drain power good indicator.

Applications

  • Laptop Computers
  • Tablet PCs
  • Networking Systems
  • Servers
  • Personal Video Recorders
  • Flat Panel Television and Monitors
  • Distributed Power Systems

Key Spec.

RT7291A RT7291B
Status Active Active
Vin (min) (V) 5 5
Vin (max) (V) 23 23
Number of Outputs 1 1
Vout (min) (V) 4.95 5.049
Vout (max) (V) 5.05 5.151
Output Adj. Method Fixed Fixed
Iout (max) (A) 6 6
Current Limit (typ) (A) 9.5 9.5
Freq (typ) (kHz) 500 500
Ext Sync No No
Ron_HS (typ) (mOhm) 31 31
Ron_LS (typ) (mOhm) 20 20
Iq (typ) (mA) 0.1 0.1
Features ACOT Control;Built-in Bootstrap Switch;COT Control;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;Fast Transient Response;Internal Compensation;Low Dropout;OCP;OTP;OVP;Power Good;SCP;Stable with Ceramic Capacitor;UVP ACOT Control;Built-in Bootstrap Switch;COT Control;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;Fast Transient Response;Internal Compensation;Low Dropout;OCP;OTP;OVP;Power Good;SCP;Stable with Ceramic Capacitor;UVP
Package Type UQFN3x3-16(FC) UQFN3x3-16(FC)

Features

  • 5V to 23V Input Voltage Range

  • Up to 98% Duty for 2S Battery Application

  • PWM Frequency Fixed 500kHz

  • ACOT® Mode Performs Fast Transient Response

  • Integrated MOSFETs
    ► 31mΩ of High-Side MOSFET
    ► 20mΩ of Low-Side MOSFET

  • Support Output MLCC Stable

  • Internal Soft-Start (1.5ms typ)

  • Built-in OVP/UVP/OCP

  • Power Good Indicator

  • Fixed 300kHz VCLK to Support Charge Pump

  • Individual EN for PWM and LDO

  • Thermal Shutdown

RT7291BGQUF
Package Type:UQFN3x3-16(FC)