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RT5742

2.4MHz 2A Step-Down Converter with I2C Interface

RT5742
New

The RT5742 is a step-down switching voltage regulator that delivers a digitally programmable output from an input voltage supply of 2.5V to 5.5V. The output voltage is programmed through an I2C interface capable of operating up to 3.4MHz.

Using a proprietary architecture with synchronous rectification, the RT5742 is capable of delivering 2A continuously at over 80% efficiency, maintaining that efficiency at load currents as low as 10mA. The regulator operates at a nominal fixed frequency of 2.4MHz, which reduces the value of the external components. 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-Save Mode with a typical quiescent current of 50μA 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 the Shutdown Mode, the supply current drops below 1μA, reducing power consumption. The PFM Mode can be disabled if fixed frequency is desired. The RT5742 is available in a small WL-CSP-11B 1.31x1.62 (BSC).

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

Applications

  • Wearable and Portable Electronic Devices
  • DDR Memories, LPDDR3, LPDDR4, LPDDR5
  • Tablets, Netbooks, Ultra-Mobile PCs
  • Smart Speakers, Voice Assistant Devices
  • TV Stick, OTT and Home Entertainment Devices

Key Spec.

RT5742A
Status Active
Vin (min) (V) 2.5
Vin (max) (V) 5.5
Vout (min) (V) 0.3
Vout (max) (V) 1.3
Output Adj. Method Digital
Iout (max) (A) 2
Current Limit (typ) (A) 6.3
Freq (typ) (kHz) 2400
Ext Sync No
Ron_HS (typ) (mOhm) 60
Ron_LS (typ) (mOhm) 34
Iq (typ) (mA) 0.05
Interface I2C
Features Enable Input;I2C;OCP;OTP;PSM;Power Good;UVP
Package Type WL-CSP1.31x1.62-11(BSC)

Features

  • Programmable Output Voltage Range: 0.3V to 1.3V, 5mV/bit

  • Programmable Slew Rate for Voltage Transitions

  • Steady 2.4MHz Switching Frequency

  • Fast Load Transient with ACOT® Control Topology

  • Continuous Output Current Capability: 2A

  • 2.5V to 5.5V Input Voltage Range

  • Digitally Programmable Output Voltage

  • I2C-Compatible Interface Up to 3.4MHz

  • Selectable Auto PFM/PWM Mode for High Efficiency at Light Load

  • Quiescent Current in PFM Mode: 50µA (Typical)

  • Input Undervoltage Lockout (UVLO)

  • Thermal Shutdown and Overload Protection

  • Power Good Indicator for Sequence Control

Application Notes

Datasheet

DS5742-00.pdf

Datasheet

DS5742-00.pdf

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