Product specifications
The MxL76502 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 2A continuous output current over a wide
input range.
The MxL76502 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 MxL76502 integrates extensive protection functions,
including under-voltage lockout (UVLO), over-current
protection (OCP), under-voltage protection (UVP),and thermal shutdown.
The MxL76502 offers two modes of operation, PFM
(MxL76502N) and forced PWM—FPWM—(MxL76502A),
to suit different applications. PFM mode provides high
efficiency at light loads and low standby power. FPWM mode
provides 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
■ 2A 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
■ 90mW/67mW integrated high-side (HS)/low-side (LS) power switches
■ Accurate EN/UVLO threshold
■ High-efficiency operation at light load (MxL76502N)
■ FPWM mode of operation (MxL76502A)
■ Thermal shutdown with auto-recovery
■ Hiccup mode short-circuit protection
■ Available in a 6-pin SOT23-6L package
Applications
■ Laptop computers
■ Tablet PCs
■ Networking systems
■ Personal video recorders
■ Flat panel television and monitors
■ Distributed power system
