BD9E151NUX Datasheet, PDF (2/22 Pages) Rohm – 1ch Step-Down Switching Regulator

BD9E151NUX
Pin Configuration
Datasheet
Pin Description
Pin No.
1
2
3
4
Figure 2. Pin Configuration (TOP VIEW)
Pin Name
BST
Description
The pin is power supply for floating Power NMOS driver. Connect bypass capacitor
between the pin and LX pin for bootstrap operation.
VIN
Input supply. Place bypass capacitor as close as possible to this pin.
EN
Enable input pin. Apply more than 2.4V to start-up the DCDC. This pin is pulled down by
700kΩ, apply less than 0.8V or open to shutdown the DCDC.
SS
Soft start pin. An external capacitor connected to this pin sets output rise time.
5
FB
Inverting node of the gm amplifier.
6
VC
Error amplifier output, and input to the PWM comparator. Connect phase compensation
components to this pin.
7
GND
Ground.
6
LX
Place schottky barrier diode as close as possible and inductor to this pin.
-
Back side
PAD
PAD for radiation of heat. Connect to GND is recommended.
Block Diagram
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TSZ22111・15・001
Figure 3. Block Diagram
2/19
TSZ02210-0Q3Q0AZ00160-1-2
2013.07.17 Rev.001