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RT2805A

5A, 36V, 500kHz Current Mode Asynchronous Step-Down Converter

RT2805A
New

The RT2805A is a current mode asynchronous step-down converter that achieves excellent load and line regulation. Over a wide input voltage range from 5.5V to 36V and supports output current up to 5A. The Current mode operation provides fast transient response and eases loop stabilization. An adjustable soft-start reduces the stress on the input source at startup. In shutdown mode, the regulator draws only 25µA of supply current. The RT2805A requires a minimum number of readily available external components, providing a compact solution. The RT2805A provides protection functions inducing input under voltage lockout, cycle-by-cycle current limit, short circuit protection and thermal shutdown protection.

The RT2805A is available in the SOP-8 (Exposed Pad) package.

Applications

  • Distributive Power Systems
  • Battery Charger
  • DSL Modems
  • Pre-regulator for Linear Regulators

Key Spec.

RT2805A
Status Active
Vin (min) (V) 5.5
Vin (max) (V) 36
Number of Outputs 1
Vout (min) (V) 1.222
Vout (max) (V) 26
Output Adj. Method Resistor
Iout (max) (A) 5
Current Limit (typ) (A) 7.5
Freq (typ) (kHz) 500
Freq (min) (kHz) 400
Freq (max) (kHz) 600
Ext Sync No
Ron_HS (typ) (mOhm) 110
Iq (typ) (mA) 0.6
Features Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;Force PWM;Internal Compensation;OCP;OTP;SCP;Stable with Ceramic Capacitor;UVP
Package Type PSOP-8

Features

  • 5A Output Current

  • Wide Operating Input Range 5.5V to 36V

  • Adjustable Output Voltage from 1.222V to 26V

  • High Efficiency up to 90%

  • Internal Compensation Minimizes External Parts Count

  • Internal Soft-Start

  • 110mΩ Internal Power MOSFET Switch

  • 25µA Shutdown Mode

  • Fixed 500kHz Frequency

  • Thermal Shutdown

  • Cycle-by-Cycle Current Limit

  • Available In an SOP-8 (Exposed Pad) Package

  • RoHS Compliant and Halogen Free

Datasheet

DS2805A-03.pdf

Videos

How to estimate control loop bandwidth from the transient response time?

Datasheet

DS2805A-03.pdf

Contact us for more information