IC manufacturers Richtek

IC manufacturers (95)

Richtek RT2857B | Demoboard DS2857B-03

6A, 18V, Synchronous Step-Down Converter

Overview

TopologyBuck Converter
Input voltage4.5-18 V
Switching frequency200-1600 kHz
Output 118 V / 6 A
IC revisionDS2857B-03

Description

6A, 18V, Synchronous Step-Down ConverterThe RT2857B is a high efficiency, monolithic synchronousstep-down DC/DC converter that can deliver up to 6A outputcurrent from a 4.5V to 18V input supply. The RT2857Bcurrent-mode architecture with external compensationallows the transient response to be optimized over a widerange of loads and output capacitors. Cycle-by-cyclecurrent limit provides protection against shorted outputsand soft-start eliminates input current surge during startup.Fault condition protections include output over-currentprotection, output over-voltage protection, and overtemperatureprotection. The low current shutdown modeprovides output disconnection, enabling easy powermanagement in battery-powered systems.

Features

 Low RDS(ON) Power MOSFET Switches 26mΩ/19mΩ Input Voltage Range : 4.5V to 18V Adjustable Switching Frequency : 200kHz to 1.6MHz Current-Mode Control Synchronous to External Clock : 200kHz to 1.6MHz Accurate Voltage Reference 0.6V ± 1%, Over −40°Cto 85°C Monotonic Start-Up into Pre-biased Outputs Adjustable Soft-Start Power Good Indicator Over-Current Protection Over-Temperature and Over-Voltage Protection Input Under-Voltage Lockout RoHS Compliant and Halogen Free

Typical applications

  • Notebook Computers
  • High Performance Point of Load Regulation / High Density and Distributed Power Systems

More information

Products

Order Code Data­sheet Simu­lation Downloads Product seriesL
(µH)
IRP,40K
(A)
ISAT,10%
(A)
ISAT,30%
(A)
RDC
(mΩ)
fres
(MHz)
Material Samples
7443552150SPEC
8 files WE-HCI SMT Flat Wire High Current Inductor 1.5 18 6.5 17 5.3 63 WE-PERM
744325180SPEC
8 files WE-HCI SMT Flat Wire High Current Inductor 1.8 22.1 7 18 3.5 70 Superflux
7443552200SPEC
8 files WE-HCI SMT Flat Wire High Current Inductor 2 14.8 5 13 7.3 53 WE-PERM
744323220SPEC
8 files WE-HCI SMT Flat Wire High Current Inductor 2.2 12.4 7 15 11.38 36 Superflux
744325240SPEC
8 files WE-HCI SMT Flat Wire High Current Inductor 2.4 18.6 6.9 17 4.75 67 Superflux
7443552280SPEC
8 files WE-HCI SMT Flat Wire High Current Inductor 2.8 12.1 4.8 11 10.6 46 WE-PERM
744325330SPEC
8 files WE-HCI SMT Flat Wire High Current Inductor 3.3 16.6 5 15 5.9 54 Superflux
744325420SPEC
8 files WE-HCI SMT Flat Wire High Current Inductor 4.2 15.4 5 14 7.1 33 Superflux
7443552430SPEC
8 files WE-HCI SMT Flat Wire High Current Inductor 4.3 10.9 3.5 8 14.1 33 WE-PERM
744325550SPEC
8 files WE-HCI SMT Flat Wire High Current Inductor 5.5 12 4.5 12 10.3 30 Superflux
7443552560SPEC
8 files WE-HCI SMT Flat Wire High Current Inductor 5.6 8.3 3.3 7.5 20.6 30 WE-PERM
Samples
Order Code Data­sheet Simu­lation Downloads Product seriesL
(µH)
IRP,40K
(A)
ISAT,10%
(A)
ISAT,30%
(A)
RDC
(mΩ)
fres
(MHz)
Material Samples