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The RT5744 and RT5746 are step-down switching voltage regulators that deliver a digitally programmable output from an input voltage supply of 2.5V to 5.5V. The output voltage is programmed through an I2C interface that can operate up to 3.4MHz.

Using a proprietary architecture with synchronous rectification, the RT5744 and RT5746 are capable of delivering continuous 4A and 6A, maintaining that efficiency at load currents as low as 10mA. The regulator operates at a nominal fixed frequency of 2.4MHz, which reduces the external component counts. Additional output capacitance can be added to improve regulation during load transients without affecting stability.

At moderate and light loads, Pulse Frequency Modulation (PFM) is used to operate in power-saving mode with a typical quiescent current of 45μA at room temperature. Even with such a low quiescent current, the part exhibits excellent transient response during large load swings. At higher loads, the system automatically switches to fixed frequency control, operating at 2.4MHz. In shutdown mode, the supply current is typically 0.1μA, and is excellent in reducing power consumption. The PFM mode can be disabled if the fixed frequency is desired. The RT5744 and RT5746 are available in WL-CSP-14B 1.31x2.02 (BSC) package.

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

Applications

  • Application, Graphic, and DSP Processors
  • ARMTM, TegraTM, OMAPTM, NovaThorTM, ARMADATM, KraitTM, etc.
  • Hard Disk Drives, LPDDR3, LPDDR4, LPDDR5
  • Tablets, Netbooks, Ultra-Mobile PCs
  • Smart Phones
  • Gaming Devices
Key Spec.
RT5744A RT5744B RT5746A
Status Active Active Active
Vin (min) (V) 2.5 2.5 2.5
Vin (max) (V) 5.5 5.5 5.5
Number of Outputs 1 1 1
Vout (min) (V) 0.27 0.27 0.27
Vout (max) (V) 1.4 1.4 1.4
Output Adj. Method Digital Digital Digital
Iout (max) (A) 4 4 6
Current Limit (typ) (A) 4.5 4.5 6.5
Freq (typ) (kHz) 2400 2400 2400
Ext Sync No No No
Ron_HS (typ) (mOhm) 30 30 30
Ron_LS (typ) (mOhm) 17 17 17
Iq (typ) (mA) 0.045 0.045 0.045
Interface I2C I2C I2C
Features ACOT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;I2C;OCP;OTP;OVP;Power Good;Selectable (PSM or PWM);Stable with Ceramic Capacitor;UVP ACOT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;I2C;OCP;OTP;OVP;Power Good;Selectable (PSM or PWM);Stable with Ceramic Capacitor;UVP ACOT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;I2C;OCP;OTP;OVP;Power Good;Selectable (PSM or PWM);Stable with Ceramic Capacitor;UVP
Package Type WL-CSP1.31x2.02-14(BSC) WL-CSP1.31x2.02-14(BSC) WL-CSP1.31x2.02-14(BSC)
Features
  • Programmable Output Voltage Range
    ► 0.27V to 1.4V, 6.25mV/bit
  • Programmable Slew Rate for Voltage Transitions
  • Steady 2.4MHz Switching Frequency
  • Fast Load Transient
  • Continuous Output Current Capability: 4A/6A
  • 2.5V to 5.5V Input Voltage Range
  • Digitally Programmable Output Voltage
  • I2C-Compatible Interface Up to 3.4Mbps
  • PFM Mode for High Efficiency at Light Load
  • Quiescent Current in PFM Mode: 45μA (Typical)
  • Input Undervoltage Lockout (UVLO)
  • Thermal Shutdown and Overload Protection
  • Power Good Indicator
Part NumberPackage TypePackage Qty.Free SampleDistributorStockBuy From Authorized Distributor
RT5744AP-AWL-CSP1.31x2.02-14(BSC)3,000 Request Digikey 3,000 Buy
Mouser 0 Lead-Time: 14 weeks
RT5744BP-AWL-CSP1.31x2.02-14(BSC)3,000 Request Digikey 3,000 Buy
Mouser 0 Lead-Time: 14 weeks
Please confirm with our distributor or sales representative for actual stock status.
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