MIC2182 datasheet(12/40 Pages) MICROCHIP

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MIC2182

DS20006644A-page 12

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2022 Microchip Technology Inc. and its subsidiaries

3.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

PIN FUNCTION TABLE

Pin Number

Name

Description

Soft-Start (External Component): Connect external capacitor to ground to reduce

inrush current by delaying and slowing the output voltage rise time. Rise time is

controlled by an internal 5 µA current source that charges an external capacitor to

VDD.

PWM

PWM/Skip-Mode Select (Input): Low sets PWM-mode operation. 1 nF capacitor to

ground sets automatic PWM/skip-mode selection.

COMP

Compensation (Output): Internal error amplifier output. Connect to capacitor or

series RC network to compensate the regulator control loop.

SGND

Small Signal Ground (Return): Route separately from other ground traces to the (–)

terminal of COUT.

SYNC

Frequency Synchronization (Input): Optional. Connect to external clock signal to

synchronize the oscillator. Leading edge of signal above the threshold terminates

the switching cycle. Connect to SGND if unused.

EN/UVLO

Enable/Undervoltage Lockout (Input): Low-level signal powers down the controller.

Input below the 2.5V UVLO threshold voltage disables switching and functions as

an accurate undervoltage lockout (UVLO). Input below the 1.1V enable threshold

voltage forces complete micropower (< 0.1 µA) shutdown.

7 (Fixed)

VREF

Reference Voltage (Output): 1.245V output. Requires 0.1 µF capacitor to ground.

7 (Adj.)

Feedback (Input): Regulates FB pin to 1.245V. See the Applications Information

section for resistor divider calculations.

CSH

Current-Sense High (Input): Current-limit comparator non-inverting input. A built-in

offset of 100 mV between CSH and VOUT pins in conjunction with the

current-sense resistor set the current-limit threshold level. This is also the positive

input to the current sense amplifier.

VOUT

Current-Sense Low (Input): Output voltage feedback input and inverting input for

the current limit comparator and the current sense amplifier.

VIN

[Battery] Unregulated Input (Input): +4.5V to +32V supply input.

VDD

5V Internal Linear-Regulator (Output): VDD is the external MOSFET gate drive

supply voltage and an internal supply bus for the IC. Bypass to SGND

with a 4.7 µF capacitor. VDD can supply up to 5 mA for external loads.

PGND

MOSFET Driver Power Ground (Return): Connects to source of synchronous

MOSFET and the (–) terminal of CIN.

LSD

Low-Side Drive (Output): High-current driver output for external synchronous

MOSFET. Voltage swing is between ground and VDD.

BST

Boost (Input): Provides drive voltage for the high-side MOSFET driver. The drive

voltage is higher than the input voltage by VDD minus a diode drop.

VSW

Switch (Return): High-side MOSFET driver return.

HSD

High-Side Drive (Output): High-current driver output for high-side MOSFET. This

node voltage swing is between ground and VIN + 5V - Vdiode drop.

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