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RT5751C/RT5751D

6V 1.5A, ACOT® Buck Converter

RT5751C/RT5751D
New

The RT5751C/D is a simple, easy-to-use, 1.5A synchronous step-down DC-DC converter with an input supply voltage range from 2.8V to 6V. The device builds in an accurate 0.6V reference voltage and integrates low RDS(ON) power MOSFETs to achieve high efficiency in WDFN-6L 2x2, TSOT-23-5 and TSOT-23-6 packages.

The RT5751C/D adopts Advanced Constant On-Time (ACOT®) control architecture to provide an ultrafast transient response with few external components and to operate at nearly constant switching frequency over the line, load, and output voltage range. The RT5751C operates in automatic PSM that maintains high efficiency during light load operation. The RT5751D operates in Forced PWM that helps to meet tight voltage regulation accuracy requirements.

The RT5751C/D senses both FETs current for a robust overcurrent protection. The device features cycle-by-cycle current-limit protection and prevents the device from the catastrophic damage in output short circuit, overcurrent or inductor saturation. A built-in soft-start function prevents inrush current during start-up. The device also includes input undervoltage lockout, output undervoltage protection, and over-temperature protection to provide safe and smooth operation in all operating conditions.

Applications

  • Mobile Phones and Handheld Devices
  • STB, Cable Modem, and xDSL Platforms
  • WLAN ASIC Power/Storage (SSD and HDD)
  • General Purpose for POL LV Buck Converter

Key Spec.

RT5751C RT5751D
Status Active Active
Vin (min) (V) 2.8 2.8
Vin (max) (V) 6 6
Vout (min) (V) 0.6 0.6
Vout (max) (V) 3.3 3.3
Output Adj. Method Resistor Resistor
Iout (max) (A) 1.5 1.5
Current Limit (typ) (A) 3.4 3.4
Freq (min) (kHz) 1500 1500
Ext Sync No Yes
Ron_HS (typ) (mOhm) 120 120
Ron_LS (typ) (mOhm) 80 80
Iq (typ) (mA) 0.025 0.025
Features ACOT Control;Cycle-by-Cycle Current Limit;Enable Input;OCP;PSM;Power Good;UVP ACOT Control;Cycle-by-Cycle Current Limit;Enable Input;Force PWM;OCP;Power Good;UVP
Package Type TSOT-25;TSOT-26;WDFN2x2-6 TSOT-25;TSOT-26;WDFN2x2-6

Features

  • Input Voltage Range from 2.8V to 6V

  • Integrated 120mΩ and 80mΩ FETs

  • 1.5A Output Current, up to 95% Efficiency

  • 100% Duty Cycle for Lowest Dropout

  • 1% Internal Reference Voltage

  • 1.5MHz Typical Switching Frequency

  • Power Saving Mode for Light Loads (RT5751C)

  • Low Quiescent Current: 25μA (Typ.)

  • Fast Advanced Constant On-Time (ACOT®) Control

  • Internal Soft-startup (0.6ms)

  • Enable Control Input

  • Power Good Indicator

  • Both FETs Overcurrent Protection

  • Negative Overcurrent Protection (RT5751D)

  • Input Undervoltage Lockout Protection

  • Hiccup-Mode Output Undervoltage Protection

  • Over-Temperature Protection

  • RoHS Compliant and Halogen Free

Datasheet

DS5751CD-00.pdf

Datasheet

DS5751CD-00.pdf

Contact us for more information