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3A, 36V, Synchronous Step-Down Converter

RT2872

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The RT2872 is a high efficiency, current-mode synchronous step-down DC/DC converter that can deliver up to 3A output current over a wide input voltage range from 4.5V to 36V. The device integrates 105mΩ high-side and 80mΩ low-side MOSFETs to achieve high conversion efficiency. The current-mode control architecture supports fast transient response and simple external compensation.

A cycle-by-cycle current limit function provides protection against shorted output and an internal soft-start eliminates input current surge during start-up. The RT2872 provides complete protection functions such as input under-voltage lockout, output under-voltage protection, over-current protection and thermal shutdown.

The RT2872 is available in the thermal enhanced SOP-8 (Exposed Pad) package.

Applications

  • Point of Load Regulator in Distributed Power Systems
  • Digital Set Top Boxes
  • Broadband Communications
  • Vehicle Electronics
  • Automotive Audio, Navigation, and Information Systems
  • Enterprise Datacom Platforms Point of Load (POL)
  • Industrial Grade General Purpose Point of Load
Key Spec.
RT2872
Status Active
Vin (min) (V) 4.5
Vin (max) (V) 36
Number of Outputs 1
Vout (min) (V) 0.8
Vout (max) (V) 30
Output Adj. Method Resistor
Iout (max) (A) 3
Current Limit (typ) (A) 5
Freq (typ) (kHz) 500
Freq (min) (kHz) 300
Freq (max) (kHz) 1000
Ext Sync No
Ron_HS (typ) (mOhm) 105
Ron_LS (typ) (mOhm) 80
Iq (typ) (mA) 1
Features AEC-Q100 Qualified;Current Mode Control;Cycle-by-Cycle Current Limit;Force PWM;OCP;Stable with Ceramic Capacitor;UVP
Package Type PSOP-8
Features
  • 4.5V to 36V Input Voltage Range
  • 3A Output Current
  • Internal N-MOSFETs
  • Current Mode Control
  • Frequency Operation : 300kHz to 1MHz
  • Adjustable Output Voltage from 0.8V to 30V
  • High Efficiency Up to 95%
  • Stable with Low ESR Ceramic Output Capacitors
  • Cycle-by-Cycle Current Limit
  • Input Under-Voltage Lockout
  • Output Under-Voltage Protection
  • Thermal Shutdown
  • AEC-Q100 Grade 3 Certification
  • RoHS Compliant and Halogen Free
Datasheet
TitleLast UpdateShareDownload
3A, 36V, Synchronous Step-Down Converter2013/05/20
Technical Documents
TitleLast UpdateShareDownload
Richtek Wide Input Voltage Range DC/DC Power Solutions for Industrial, Automotive and LED lighting applications2019/12/12
Automotive Product Selection Guide2018/11/15
Videos
TitleLast UpdateShareViews
How to estimate control loop bandwidth from the transient response time?2017/03/30 755
Design Tool
TitleLast UpdateShare
Richtek Designer™ Web Simulation Tool : RT2872GSP2020/02/05
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT2872GSPPSOP-82500 Not available Buy from Distributor
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