The LM5161-Q1 is a 100-V, 1-A synchronous step-down converter with integrated high-side
and low-side MOSFETs. The constant-ON-time control scheme requires no loop compensation and
supports high step-down ratios with fast transient response. An internal feedback amplifier
maintains ±1% output voltage regulation over the entire operating temperature range. The ON-time
varies inversely with input voltage resulting in nearly constant switching frequency. Peak and
valley current limit circuits protect against overload conditions. The under-voltage lockout
(EN/UVLO) circuit provides independently adjustable input undervoltage threshold and hysteresis.
The FPWM input pin in LM5161-Q1 selects either the forced continuous conduction mode (CCM) under
all load levels or the discontinuous conduction mode (DCM) under light or no load conditions. When
operating in forced CCM, the LM5161-Q1 supports the multiple output and isolated Fly-Buck
applications. When programmed for the DCM operation, the LM5161-Q1 provides a tightly regulated
buck output without any additional external feedback ripple injection circuit.
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