3A, 1.2MHz, 6V Synchronous Step-Down Converter In WDFN-8L 2x2

RT5753

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The RT5753 is a simple, easy-to-use, 3A synchronous step-down DC-DC converter with an input supply voltage range from 2.5V to 6V. The device builds in an accurate 0.6V reference voltage and integrates low R_DS(ON) power MOSFETs to achieve high efficiency in WDFN-8L 2x2 and WDFN-8SL 2x2 packages.

The RT5753 adopts Advanced Constant On-Time (ACOT^®) control architecture to provide an ultrafast transient response with few external components and to operate in nearly constant switching frequency over the line, load, and output voltage range. The RT5753A/C/E/F operates in automatic PSM that maintains high efficiency during light load operation. The RT5753B/D operates in Forced PWM that helps to meet tight voltage regulation accuracy requirements.

The RT5753 senses both FETs current for a robust overcurrent protection. The device features cycle-by-cycle current limit protection which prevents the device from the catastrophic damage in output short circuit, over current 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, overvoltage protection (RT5753AL/BL/CL/DL/EL/FL) 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 Converters

Key Spec.

	RT5753A	RT5753B	RT5753C	RT5753D	RT5753EL	RT5753FL
Status	Active	Active	Active	Active	Active	Active
Vin (min) (V)	2.5	2.5	2.5	2.5	2.5	2.5
Vin (max) (V)	5.5	5.5	5.5	5.5	5.5	5.5
Number of Outputs	1	1	1	1	1	1
Vout (min) (V)	0.6	0.6	0.6	0.6	0.6	0.6
Vout (max) (V)	5.5	5.5	5.5	5.5	5.5	5.5
Output Adj. Method	Resistor	Resistor	Resistor	Resistor	Resistor	Resistor
Iout (max) (A)	3	3	3	3	3	3
Current Limit (typ) (A)	3.45	3.45	3.45	3.45	3.45	3.45
Freq (typ) (kHz)	1200	1200	1200	1200	1200	1200
Ext Sync	No	No	No	No	No	No
Ron_HS (typ) (mOhm)	100	100	100	100	100	100
Ron_LS (typ) (mOhm)	70	70	70	70	70	70
Iq (typ) (mA)	0.035	0.035	0.035	0.035	0.035	0.035
Features	100% Duty Cycle;ACOT Control;COT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;OCP;OTP;OVP;PSM;Power Good;SCP;Stable with Ceramic Capacitor;UVP	100% Duty Cycle;ACOT Control;COT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;Force PWM;OCP;OTP;OVP;Power Good;SCP;Stable with Ceramic Capacitor;UVP	100% Duty Cycle;ACOT Control;COT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;OCP;OTP;OVP;PSM;Power Good;SCP;Stable with Ceramic Capacitor;UVP	100% Duty Cycle;ACOT Control;COT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;Force PWM;OCP;OTP;OVP;Power Good;SCP;Stable with Ceramic Capacitor;UVP	100% Duty Cycle;ACOT Control;COT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;OCP;OTP;OVP;PSM;Power Good;SCP;Stable with Ceramic Capacitor;UVP	100% Duty Cycle;ACOT Control;COT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;OCP;OTP;OVP;PSM;Power Good;SCP;Stable with Ceramic Capacitor;UVP
Package Type	WDFN2x2-8;WDFN2x2-8S	WDFN2x2-8;WDFN2x2-8S	WDFN2x2-8;WDFN2x2-8S	WDFN2x2-8;WDFN2x2-8S	WDFN2x2-8;WDFN2x2-8S	WDFN2x2-8;WDFN2x2-8S