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Overview
| Topology | Buck Converter |
| Input voltage | 4.5-18 V |
| Switching frequency | 400-600 kHz |
| Output 1 | 5 V / 6 A |
| IC revision | 1 |
Description
The RT6257A/B is a high-efficiency, monolithic synchronous step-down DC-DC converter that can deliver up to 6A output current from a 4.5V to 18V input supply. The RT6257A/B adopts ACOT architecture to allow the transient response to be improved and keep in constant frequency. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. Fault conditions also include output under voltage protection and thermal shutdown.
Features
- 4.5V to 18V Input Voltage Range
- 6A Output Current
- Constant-On-Time Mode to Enables Fast Transient Response
- Low Output Ripple and Allows Ceramic Output Capacitor
- 500kHz Switching Frequency
- High Efficient Internal Power MOSFET Switch
- Optimized for Lower Duty Cycle Applications
- Integrated 30m/20mMOSFETs
- Adjustable Output Voltage from 0.6V to 5V
- Internal Soft-Start (1.5ms typ.)
- Built-In UVP/OTP
- Input Under Voltage Lockout
- TSOT23-6 (FC) Package
Typical applications
- LCD TV
- Portable TV
- Access Point Router/ Set Top Box/ DSL Modem
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 | RDC max.(mΩ) | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-HCI SMT Flat Wire High Current Inductor, 1.2 µH, 32.6 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance1.2 µH | Performance Rated Current32.6 A | Saturation Current @ 10%12 A | Saturation Current @ 30%25 A | DC Resistance1.8 mΩ | Self Resonant Frequency75 MHz | MaterialSuperflux | DC Resistance1.98 mΩ | MountSMT | ||||
 | WE-LHMI SMT Power Inductor, 3.3 µH, 11.1 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LHMI SMT Power Inductor | Inductance3.3 µH | Performance Rated Current11.1 A | Saturation Current @ 10%15.6 A | Saturation Current @ 30%31.2 A | – | Self Resonant Frequency22 MHz | – | DC Resistance11.8 mΩ | MountSMT |