The LM2650 is a step-down DC/DC converter featuring high efficiency over a 3A to
milliamperes load range. This feature makes the LM2650 an ideal fit in battery-powered applications
that demand long battery life in both run and standby modes.
The LM2650 also features a logic-controlled shutdown mode in which it draws at most 25μA
from the input power supply.
The LM2650 employs a fixed-frequency pulse-width modulation (PWM) and synchronous
rectification to achieve very high efficiencies. In many applications, efficiencies reach 95%+ for
loads around 1A and exceed 90% for moderate to heavy loads from 0.2A to 2A.
A low-power hysteretic or "sleep" mode keeps efficiencies high at light loads. The LM2650
enters and exits sleep mode automatically as the load crosses "sleep in" and "sleep out"
thresholds. The LM2650 provides nodes for programming both thresholds via external resistors. A
logic input allows the user to override the automatic sleep feature and keep the LM2650 in PWM mode
regardless of the load level.
An optional soft-start feature limits current surges from the input power supply at start
up and provides a simple means of sequencing multiple power supplies.
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