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The RT5771D is a high efficiency synchronous, step-down DC-DC converter. Its input voltage ranges from 2.7V to 5.5V that provides an adjustable regulated output voltage from 0.6V to VIN while delivering up to 3A of output current. The internal synchronous low on-resistance power switches increase efficiency and eliminate the need for an external Schottky diode. The switching frequency is fixed internally at 1MHz. The 100% duty cycle provides low dropout operation, hence extending battery life in portable systems. Current mode operation with internal compensation allows the transient response to be optimized over a wide range of loads and output capacitors. The RT5771D is available in the WDFN-10L 3x3 package.

Applications

  • Portable Instruments
  • Battery Powered Equipments
  • Notebook Computers
  • Distributed Power Systems
  • IP Phones
  • Digital Cameras
Key Spec.
RT5771D
Status Active
Vin (min) (V) 2.7
Vin (max) (V) 5.5
Number of Outputs 1
Vout (min) (V) 0.6
Vout (max) (V) 5.5
Output Adj. Method Resistor
Iout (max) (A) 3
Current Limit (typ) (A) 4.8
Freq (typ) (kHz) 1000
Ext Sync No
Ron_HS (typ) (mOhm) 69
Ron_LS (typ) (mOhm) 49
Iq (typ) (mA) 0.11
Features 100% Duty Cycle;Current Mode Control;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;Fast Transient Response;Internal Compensation;Low Dropout;OCP;Power Good;Stable with Ceramic Capacitor;UVP
Package Type WDFN3x3-10
Features
  • High Efficiency : Up to 95%
  • High Efficiency at Light Load
  • Low RDS(ON) Power Switches : 69mΩ/49mΩ
  • Fixed Frequency : 1MHz
  • No Schottky Diode Required
  • Internal Compensation
  • 0.6V Reference Allows Low Output Voltage
  • Low Dropout Operation : 100% Duty Cycle
  • OCP, UVP, OTP
Datasheet
TitleLast UpdateDownload
3A, 1MHz, Synchronous Step-Down Converter2017/02/23
Reference Design
TitleLast UpdateDownload
Richtek Load Transient Tool2022/07/25
Please confirm with our distributor or sales representative for actual stock status.
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