SNVS787I January 2012 – August 2021 LM5018
|1||RTN||—||Ground||Ground connection of the integrated circuit|
|2||VIN||I||Input Voltage||Operating input range is 7.5 V to 100 V.|
|3||UVLO||I||Input Pin of Undervoltage Comparator||Resistor divider from VIN to UVLO to GND programs the undervoltage detection threshold. An internal current source is enabled when UVLO is above 1.225 V to provide hysteresis. When UVLO pin is pulled below 0.66 V externally, the parts goes in shutdown mode.|
|4||RON||I||On-Time Control||A resistor between this pin and VIN sets the switch
on-time as a function of VIN. Minimum recommended on-time
100 ns at max input voltage.
|5||FB||I||Feedback||This pin is connected to the inverting input of the internal regulation comparator. The regulation level is 1.225 V.|
|6||VCC||O||Output From the Internal High Voltage Series Pass
Regulated at 7.6 V
|The internal VCC regulator provides bias supply for the gate drivers and other internal circuitry. A 1.0-μF decoupling capacitor is recommended.|
|7||BST||I||Bootstrap Capacitor||An external capacitor is required between the BST and SW pins
(0.01-μF ceramic). The BST pin capacitor is charged by the VCC regulator through an internal diode when the SW pin is low.
|8||SW||O||Switching Node||Power switching node. Connect to the output inductor and bootstrap capacitor.|
|—||EP||—||Exposed Pad||Exposed pad must be connected to RTN pin. Connect to system ground plane on application board for reduced thermal resistance.|