The LM2650MX-ADJ is a step-down DC/DC converter featuring high efficiency over a 3A to milliamperes load range. This feature makes the LM2650MX-ADJ an ideal fit in battery-powered applications that demand long battery life in both run and standby modes.
The LM2650MX-ADJ also features a logic-controlled shutdown mode in which it draws at most 25μA from the input power supply.
The LM2650MX-ADJ 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 LM2650MX-ADJ enters and exits sleep mode automatically as the load crosses "sleep in" and "sleep out" thresholds. The LM2650MX-ADJ provides nodes for programming both thresholds via external resistors. A logic input allows the user to override the automatic sleep feature and keep the LM2650MX-ADJ 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.
Feature
- Ultra High Efficiencies (95% possible)
- High Efficiency Over a 3A to Milliamperes Load Range
- Synchronous Switching of Internal NMOS Power FETs
- Wide Input Voltage Range (4.5V to 18V)
- Output Voltage Adjustable from 1.5V to 16V
- Automatic Low-Power Sleep Mode
- Logic-Controlled Micropower Shutdown (IQSD ≤ 25 μA)
- Frequency Adjustable up to 300 kHz
- Frequency Synchronization with External Signal
- Programmable Soft-Start
- Short-Circuit Current Limiting
- Thermal Shutdown
- Available in 24-lead Small-Outline Package
