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Overview
| Topology | Buck Converter |
| Input voltage | 4.5-18 V |
| Switching frequency | 200-1600 kHz |
| Output 1 | 18 V / 6 A |
| IC revision | DS2857B-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 | Status | Product series | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC(mΩ) | fres(MHz) | Material | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-HCI SMT Flat Wire High Current Inductor, 1.5 µH, 18 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance1.5 µH | Performance Rated Current18 A | Saturation Current @ 10%6.5 A | Saturation Current @ 30%17 A | DC Resistance5.3 mΩ | Self Resonant Frequency63 MHz | MaterialWE-PERM | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 1.8 µH, 22.1 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance1.8 µH | Performance Rated Current22.1 A | Saturation Current @ 10%7 A | Saturation Current @ 30%18 A | DC Resistance3.5 mΩ | Self Resonant Frequency70 MHz | MaterialSuperflux | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 2 µH, 14.8 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance2 µH | Performance Rated Current14.8 A | Saturation Current @ 10%5 A | Saturation Current @ 30%13 A | DC Resistance7.3 mΩ | Self Resonant Frequency53 MHz | MaterialWE-PERM | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 2.2 µH, 12.4 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance2.2 µH | Performance Rated Current12.4 A | Saturation Current @ 10%7 A | Saturation Current @ 30%15 A | DC Resistance11.38 mΩ | Self Resonant Frequency36 MHz | MaterialSuperflux | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 2.4 µH, 18.6 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance2.4 µH | Performance Rated Current18.6 A | Saturation Current @ 10%6.9 A | Saturation Current @ 30%17 A | DC Resistance4.75 mΩ | Self Resonant Frequency67 MHz | MaterialSuperflux | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 2.8 µH, 12.1 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance2.8 µH | Performance Rated Current12.1 A | Saturation Current @ 10%4.8 A | Saturation Current @ 30%11 A | DC Resistance10.6 mΩ | Self Resonant Frequency46 MHz | MaterialWE-PERM | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 3.3 µH, 16.6 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance3.3 µH | Performance Rated Current16.6 A | Saturation Current @ 10%5 A | Saturation Current @ 30%15 A | DC Resistance5.9 mΩ | Self Resonant Frequency54 MHz | MaterialSuperflux | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 4.2 µH, 15.4 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance4.2 µH | Performance Rated Current15.4 A | Saturation Current @ 10%5 A | Saturation Current @ 30%14 A | DC Resistance7.1 mΩ | Self Resonant Frequency33 MHz | MaterialSuperflux | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 4.3 µH, 10.9 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance4.3 µH | Performance Rated Current10.9 A | Saturation Current @ 10%3.5 A | Saturation Current @ 30%8 A | DC Resistance14.1 mΩ | Self Resonant Frequency33 MHz | MaterialWE-PERM | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 5.5 µH, 12 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance5.5 µH | Performance Rated Current12 A | Saturation Current @ 10%4.5 A | Saturation Current @ 30%12 A | DC Resistance10.3 mΩ | Self Resonant Frequency30 MHz | MaterialSuperflux | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 5.6 µH, 8.3 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance5.6 µH | Performance Rated Current8.3 A | Saturation Current @ 10%3.3 A | Saturation Current @ 30%7.5 A | DC Resistance20.6 mΩ | Self Resonant Frequency30 MHz | MaterialWE-PERM |