loading

5.5VIN, 2A, High Efficiency Synchronous Step-Down Converter with Low Quiescent Current

RT5715

Update Alert Share

The RT5715 is a 2A, high-efficiency, Advanced Constant-On-Time (ACOT) synchronous step-down converter. The device operates with input voltages from 2.5V to 5.5V. The device can program the output voltage between 0.45V to VIN. The low quiescent current design with the integrated low RDS(ON) power MOSFETs achieves high efficiency over the wide load range. The advanced COT operation allows transient responses to be optimized over a wide range of loads, and output capacitors to efficiently reduce external component count. The RT5715 provides up to 2.7MHz switching frequency to minimize the size of output inductor and capacitors.

The RT5715 provides complete protection functions such as input under voltage lockout, output under voltage protection, over current protection, and thermal shutdown.

Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. The RT5715 is available in WDFN-8SL 2x2 package.

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 Converter
Key Spec.
RT5715
Status Active
Vin (min) (V) 2.5
Vin (max) (V) 5.5
Number of Outputs 1
Vout (min) (V) 0.45
Vout (max) (V) 3.3
Output Adj. Method Resistor
Iout (max) (A) 2
Current Limit (typ) (A) 3.2
Freq (typ) (kHz) 2700
Ext Sync No
Ron_HS (typ) (mOhm) 100
Ron_LS (typ) (mOhm) 80
Iq (typ) (mA) 0.03
Features 100% Duty Cycle;ACOT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;Internal Compensation;OCP;OTP;PSM;Power Good;Stable with Ceramic Capacitor;UVP
Package Type WDFN2x2-8S
Features
  • 2A Converter Integrated 100mΩ and 80mΩ FETs in WDFN-8SL 2x2 Package
  • Input Supply Voltage Range : 2.5V to 5.5V
  • Output Voltage Range : 0.45V to VIN
  • Advanced Constant On-Time (ACOTTM) Control
    ► Ultrafast Transient Response
    ► No Needs for External Compensations
    ► Optimized for Low-ESR Ceramic Output Capacitors
  • High Accuracy Feedback Reference Voltage : 0.45V ± 1%
  • Low Quiescent Current : 30μA
  • Fixed Switching Frequency : 2.7MHz
  • Internally Fixed Soft-Start (typ. 150μs)
  • Safe Start-Up from Pre-biased Output
  • Input Under-Voltage Lockout (UVLO)
  • Output Under-Voltage Protection (UVP) with Hiccup Mode
  • Over-Temperature Protection (OTP) (Thermal Shutdown)
  • Enable Control
  • Power Good Indication
  • RoHS Compliant and Halogen Free
Datasheet
TitleLast UpdateShareDownload
5.5VIN, 2A, High Efficiency Synchronous Step-Down Converter with Low Quiescent Current2015/12/24
Technical Documents
TitleLast UpdateShareDownload
Richtek Selection Guide [Oct., 2020]2020/12/30
Videos
TitleLast UpdateShareViews
How to estimate control loop bandwidth from the transient response time?2017/03/30 1359
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2021/01/21
Design Tool
TitleLast UpdateShare
Richtek Designer™ Web Simulation Tool : RT5715GQW2020/09/23
TOP