MIC45205 datasheet(13/40 Pages) MICROCHIP

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2017 - 2022 Microchip Technology Inc.

DS20005798B-page 13

MIC45205

RIB

Ripple Injection Pin B. Connect this pin to FB.

40, 41

ANODE

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

be connected to the PVDD pin.

42, 43, 44

BST

Connection to the internal bootstrap circuitry and high-side power MOSFET drive

circuitry. Connect all three BST pins together.

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

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

set the desired output voltage. Connect the bottom resistor from FB to GND.

Power Good. Open-drain output. If used, connect to an external pull-up resistor of at

least 10 kΩ between PG and the external bias voltage.

Enable. A logic signal to enable or disable the step-down regulator module operation.

The EN pin is TTL/CMOS compatible. Logic-high = enable, logic-low = disable or

shutdown. EN pin has an internal 1 MΩ (typical) pull-down resistor to GND. Do not

leave floating.

VIN

Internal 5V Linear Regulator Input. A 1 μF ceramic capacitor from VIN to GND is

required for decoupling.

FREQ

Switching Frequency Adjust. Use a resistor divider from VIN to GND to program the

switching frequency. Connecting FREQ to VIN sets frequency at 600 kHz.

ILIM

Current Limit. Connect a resistor between ILIM and SW to program the current limit.

9, 13, 20, 30, 35 KEEPOUT Depopulated pin positions.

—

PVIN ePAD

PVIN Exposed Pad. Internally connected to PVIN pins. Please see PCB Layout

Guidelines section.

—

VOUT

ePAD

VOUT Exposed Pad. Internally connected to VOUT pins. Please see PCB Layout

Guidelines section.

TABLE 3-1:

PIN FUNCTION TABLE (CONTINUED)

Pin Number

Pin Name

Description

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