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Overview
| Topology | Buck Converter |
| Input voltage | 4.5-18 V |
| Switching frequency | 200-1200 kHz |
| Output 1 | 3.3 V / 3 A |
| IC revision | 00 |
Description
The RT6251A/B is a high efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 3A output current from a 4.5V to 18V input supply. The RT6251A/B current-mode architecture with external compensation allows the transient response to be optimized over a wide range of loads and output capacitors. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. Fault condition protections include output under-voltage protection, output over-voltage protection, and over-temperature protection. The low current shutdown mode provides output disconnection, enabling easy power management in battery-powered systems.
Features
- Low RDS(ON) Power MOSFET Switches 46m/36m
- Input Voltage Range : 4.5V to 18V
- Adjustable Switching Frequency : 200kHz to 1.2MHz
- Current-Mode Control
- Synchronous to External Clock : 200kHz to 1.2MHz
- Accurate Voltage Reference 0.8V ±1%
- Monotonic Start-Up into Pre-biased Outputs
- Adjustable Soft-Start
- Power Good Indicator
- Under-Voltage and Over-Voltage Protection
- Input Under-Voltage Lockout
Typical applications
- High Performance Point of Load Regulation / High Density and Distributed Power Systems
- Notebook Computers
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, 2 µH, 26.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance2 µH | Performance Rated Current26.5 A | Saturation Current @ 10%9 A | Saturation Current @ 30%22 A | DC Resistance2.6 mΩ | Self Resonant Frequency45 MHz | MaterialWE-PERM | ||||
| 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, 3.7 µH, 18.3 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance3.7 µH | Performance Rated Current18.3 A | Saturation Current @ 10%7 A | Saturation Current @ 30%16 A | DC Resistance4.9 mΩ | Self Resonant Frequency26 MHz | MaterialWE-PERM | ||||
| 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, 4.7 µH, 14.9 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance4.7 µH | Performance Rated Current14.9 A | Saturation Current @ 10%6 A | Saturation Current @ 30%15 A | DC Resistance7 mΩ | Self Resonant Frequency30 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, 6.5 µH, 11 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance6.5 µH | Performance Rated Current11 A | Saturation Current @ 10%4.4 A | Saturation Current @ 30%10 A | DC Resistance12.5 mΩ | Self Resonant Frequency27 MHz | MaterialSuperflux | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 7.3 µH, 16.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance7.3 µH | Performance Rated Current16.5 A | Saturation Current @ 10%5.5 A | Saturation Current @ 30%12 A | DC Resistance5.9 mΩ | Self Resonant Frequency28 MHz | MaterialWE-PERM |