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Richtek

RT2875B
Demoboard EVB_RT2875BQGCP

RT2875B Synchronous Step-Down Converter Evaluation Board

Topology: Buck
Input Voltage (min.): 4.50 V
Input Voltage (max.): 36.00 V
Switching Frequency (min.): 300.00 kHz
Switching Frequency (max.): 2100.00 kHz
Output 1: 3.30 V / 3.000 A

Description

The RT2875B is a high efficiency, current-mode synchronous DC/DC step-down converter that can deliver up to 3Aoutput current over a wide input voltage range from 4.5V to 36V. The device integrates 95mΩ high-side and 70mΩlow-side MOSFETs to achieve high conversion efficiency. The current-mode control architecture supports fasttransient response and simple external compensation. A cycle-by-cycle current limit function provides protection.against shorted output and an external soft-start eliminates input current surge during start-up. The RT2875Bprovides complete protection functions such as input under-voltage lockout, output under-voltage protection,over-current protection and thermal shutdown.The RT2875B is available in the thermal enhanced TSSOP-14(Exposed Pad) package.The RT2875B provides Hiccup Mode Under Voltage Protection (UVP). When the VFB voltage drops below 0.3V, theUVP function will be triggered to shut down switching operation. If the UVP condition remains for a period, theRT2875B will retry automatically. When the UVP condition is removed, the converter will resume operation. TheUVP is disabled during soft-start period.

Characteristics

  • 3A Output Current Internal N-MOSFETs Current Mode Control Adjustable Switching Frequency : 300kHz to 2.1MHz Adjustable Current Limit : 1.5A to 6A Synchronous to External Clock : 300kHz to 2.1MHz Adjustable Output Voltage from 0.6V to 24V High Efficiency Up to 95% Stable with Low ESR Ceramic Output Capacitors Cycle-by-Cycle Current Limit Input Under-Voltage Lockout Output Under-Voltage Protection Thermal Shutdown RoHS Compliant and Halogen Free

Products

  Order Code SPEC Product series L
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
Bauform Version Samples
7447714047 PDF WE-PD SMT Power Inductor 4.7 7 8 10.4 12.4 34 1050 Performance