MIC28304 datasheet(3/39 Pages) MICREL

3 / 39 page

Micrel, Inc.

MIC28304

Pin Description (Continued)

Pin Number

Pin Name

Pin Function

7, 8

FREQ

Switching Frequency Adjust Input. Leaving this pin open will set the switching frequency to 600kHz.

Alternatively a resistor from this pin to ground can be used to lower the switching frequency.

9 to 13

PGND

Power Ground. PGND is the return path for the buck converter power stage. The PGND pin

connects to the sources of low-side N-Channel external MOSFET, the negative terminals of input

capacitors, and the negative terminals of output capacitors. The return path for the power ground

should be as small as possible and separate from the analog ground (GND) return path.

14 to 22

PVIN

Power Input Voltage. Connection to the drain of the internal high-side power MOSFET.

23 to 38

VOUT

Output Voltage. Connection with the internal inductor, the output capacitor should be connected

from this pin to PGND as close to the module as possible.

No Connection. Leave it floating.

49, 50

ANODE

Anode Bootstrap Diode Input. Anode connection of internal bootstrap diode, this pin should be

connected to the PVDD pin.

52, 53

BSTC

Bootstrap Capacitor. Connection to the internal bootstrap capacitor. Leave floating, no connect.

55, 56

BSTR

Bootstrap Resistor. Connection to the internal bootstrap resistor and high-side power MOSFET

drive circuitry. Leave floating, no connect.

Feedback Input. Input to the transconductance amplifier of the control loop. The FB pin is regulated

to 0.8V. A resistor divider connecting the feedback to the output is used to set the desired output

voltage.

PGOOD

Power Good Output. Open drain output, an external pull-up resistor to external power rails is

required.

Enable Input. A logic signal to enable or disable the buck converter operation. The EN pin is CMOS

compatible. Logic high enables the device, logic low shutdowns the regulator. In the disable mode,

the input supply current for the device is minimized to 4µA typically. Do not pull EN to PVDD.

61, 62

PVDD

Internal +5V Linear Regulator Output. PVDD is the internal supply bus for the device. In the

applications with VIN < +5.5V, PVDD should be tied to VIN to by-pass the linear regulator.

No Connection. Leave it floating.

March 25, 2014

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