Ultra-Low Quiescent Current HCOT Buck Converter

RT5707/RT5707A

The RT5707/A is a high efficiency synchronous step-down converter featuring typ. 360nA quiescent current. It provides high efficiency at light load down to 10mA. Its input voltage range is from 2.2V to 5.5V. The RT5707 provides eight programmable output voltage 1.2V to 3.3V while delivering output current up to 600mA, peak to 1A. The RT5707A provides eight programmable output voltage 0.7V to 3.1V while delivering output current up to 400mA, peak to 0.5A. The Hysteretic Constant-On-Time (HCOT) operation with internal compensation allow the transient response to be optimized over a wide range of loads and output capacitors.

The RT5707/A is a available in WL-CSP-8B 0.9x1.6 (BSC) package.

Applications

Hand-Held Devices
Portable Information
Battery Powered Equipment
Wearable Devices
Internet of Things
Smart Watch

Key Spec.

	RT5707	RT5707A
Status	Active	Active
Vin (min) (V)	2.2	2.2
Vin (max) (V)	5.5	5.5
Number of Outputs	1	1
Vout (min) (V)	1.2	0.7
Vout (max) (V)	3.3	3.1
Output Adj. Method	Digital	Digital
Iout (max) (A)	1	0.5
Current Limit (typ) (A)	1.2	0.78
Freq (typ) (kHz)	1200	1200
Ron_HS (typ) (mOhm)	350	350
Ron_LS (typ) (mOhm)	250	250
Iq (typ) (mA)	0.00046	0.00046
Features	100% Duty Cycle;COT Control;Enable Input;Internal Compensation;OCP;OTP;PSM	100% Duty Cycle;COT Control;Enable Input;Internal Compensation;OCP;OTP;PSM
Package Type	WL-CSP0.9x1.6-8(BSC)	WL-CSP0.9x1.6-8(BSC)

Features

Input Voltage Range : 2.2V to 5.5V
Programmable Output Voltage 8-Level
► RT5707 1.2V to 3.3V
► RT5707A 0.7V to 3.1V
Typ. 360nA Quiescent Current
PSM Operation
Up to 94% Efficiency
Internal Compensation
Output Voltage Discharge
Over-Current Protection
Over-Temperature Protection
Output Current
► RT5707 600mA, Peak to 1A
► RT5707A 400mA, Peak to 0.5A
Automatic Transition to 100% Duty Cycle Operation