MaxLinear MXL76503 | Demoboard MXL76503 EVK

Description

The MxL76503 is a fully integrated, high-efficiency synchronous step-down converter that requires a minimum number of external components. It offers a very compact solution with up to 3A continuous output current over a wide input range.The MxL76503 uses a proprietary constant on-time (COT) control scheme that provides a superior transient response and maintains a constant switching frequency during continuous conduction mode (CCM) operation. The external ramp compensation network enables stable operation with ultra-low equivalent series resistance (ESR) output ceramic capacitors. An internal compensated error amplifier in the control loop provides excellent line and load regulation.The MxL76503 integrates extensive protection functions, including under-voltage lockout (UVLO), over-current protection (OCP), under-voltage protection (UVP), and thermal shutdown.The MxL76503 offers two modes of operation, PFM (MxL76503N) and forced PWM—FPWM—(MxL76503A), to suit different applications. PFM mode provides high efficiency at light loads and low standby power. FPWM modeprovides low ripple voltage and fast transient, even at light loads.The converter is available in a small 6-pin SOT23-6L package.

Features

Input voltage range: 4.5V to 18V

Output voltage range: 0.6V to 18V

3A continuous output current

Supports 100% duty cycle low-dropout operation

Stable operation with low ESR ceramic output capacitors

Fast pulse-width modulation (PWM) COT control with superior transient performance

720KHz switching frequency

1.2ms internal soft-start

80mΩ/56mΩ integrated high-side (HS)/low-side (LS) power switches

Accurate EN/UVLO threshold

High-efficiency operation at light load (MxL76503N)

FPWM mode of operation (MxL76503A)

Thermal shutdown with auto-recovery

Hiccup mode short-circuit protection

Available in a 6-pin SOT23-6L package

Typical applications

• Distributed power systems
• Networking systems
• Laptop computers, Tablet PCs, Personal video recorders, Flat panel television and monitors

More information

• IC product information