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RT6245

14A, 17V, 400kHz/800kHz/1200kHz Synchronous Step-Down Converter with VID Control

RT6245
New

The RT6245 is a high-performance, synchronous step-down converter that delivers up to 14A output current with an input supply voltage range of 4.5V to 17V. The output voltage can be programmable from 0.4375V to 1.3875V with I2C controlled 7-Bits VID.

The RT6245 adopts Advanced Constant On-Time (ACOT® ) control architecture that provides ultrafast transient response and further reduces the external-component count. In steady states, the ACOT® operates in nearly constant switching frequency over line, load and output voltage ranges and makes the EMI filter design easier.

The RT6245A offers automatic PSM that maintains high efficiency during light load operation.

The device offers a variety of functions for more design flexibility. The switching frequency, current limit level and VOUT slew rate are selectable via I2C. Independent enable control input pin and power good indicator are also provided for easy sequence control. Besides, the designers can also command the device to be enabled or shutdown via the I2C interface.

To control the inrush current during the startup, the device provides a programmable soft start-up by an external capacitor connected to the SS pin. Fully protection features are also integrated in the device including the cycle-by-cycle current limit control, OVP, UVP, input UVLO and OTP.

The RT6245 is available in a thermally enhanced VQFN-19L 3.5x3.5 (FC) package.

Applications

  • Industrial and Commercial Low Power Systems
  • Computer Peripherals
  • LCD Monitors and TVs
  • Green Electronics/Appliances
  • Point of Load Regulation for High-Performance DSPs, FPGAs, and ASICs

Key Spec.

RT6245A RT6245B
Status Active Active
Vin (min) (V) 4.5 4.5
Vin (max) (V) 17 17
Number of Outputs 1 1
Vout (min) (V) 0.4375 0.4375
Vout (max) (V) 1.3875 1.3875
Output Adj. Method Digital Digital
Iout (max) (A) 14 14
Current Limit (typ) (A) 11.5;13.8;16.1;9.2 11.5;13.8;16.1;9.2
Freq (typ) (kHz) 1200;400;800 1200;400;800
Ext Sync No No
Ron_HS (typ) (mOhm) 9.8 9.8
Ron_LS (typ) (mOhm) 4.5 4.5
Iq (typ) (mA) 0.6 0.6
Interface I2C I2C
Features ACOT Control;Adjustable Current Limit;Adjustable Frequency;Adjustable Soft-Start;Built-in Bootstrap Switch;Diode Emulation Mode;Enable Input;Fast Transient Response;I2C;Internal Compensation;OTP;Power Good;Stable with Ceramic Capacitor;UVP ACOT Control;Adjustable Current Limit;Adjustable Frequency;Adjustable Soft-Start;Built-in Bootstrap Switch;Enable Input;Fast Transient Response;Force PWM;I2C;Internal Compensation;OTP;Power Good;Stable with Ceramic Capacitor;UVP
Package Type VQFN3.5x3.5-19(FC) VQFN3.5x3.5-19(FC)

Features

  • VID Control Range via I2C Compatible Interface : 0.4375V to 1.3875V in 12.5mV Steps

  • 4.5V to 17V Input Voltage Range

  • 14A Output Current Only Support 400kHz

  • Integrated 9.8mΩ/4.5mΩ MOSFETs

  • Stable with Ceramic Output Capacitor

  • ACOT® Control for Fast Transient Response

  • Selectable Switching Frequency (400kHz/800kHz/1200kHz)

  • Adjustable Current Limit Level

  • Adjustable Thermal Shutdown Level

  • Programmable Soft-Start Time with a Default 2ms

  • Monotonic Start-Up into Pre-Biased Outputs

  • 19-Lead VQFN (FC) Package

Datasheet

DS6245-00.pdf

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