2.4MHz 4A/6A Step-Down Converter with I²C Interface

RT5744/RT5746

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.

应用

Application, Graphic, and DSP Processors
ARM^TM, Tegra^TM, OMAP^TM, NovaThor^TM, ARMADA^TM, Krait^TM, etc.
Hard Disk Drives, LPDDR3, LPDDR4, LPDDR5
Tablets, Netbooks, Ultra-Mobile PCs
Smart Phones
Gaming Devices

主要规格

	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)