MIC2182 datasheet(27/40 Pages) MICROCHIP

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2022 Microchip Technology Inc. and its subsidiaries

DS20006644A-page 27

MIC2182

5.9

Decoupling Capacitor Selection

The 4.7 µF decoupling capacitor is used to minimize

noise on the VDD pin. The placement of this capacitor

is critical to the proper operation of the IC. It must be

placed right next to the pins and routed with a wide

trace. The capacitor should be a good quality tantalum.

An additional 1 µF ceramic capacitor may be

necessary when driving large MOSFETs with high gate

capacitance. Incorrect placement of the VDD

decoupling capacitor will cause jitter or oscillations in

the switching waveform and large variations in the

overcurrent limit.

A 0.1 µF ceramic capacitor is required to decouple the

VIN. The capacitor should be placed near the IC and

connected directly to between Pin 10 (VIN) and Pin 12

(PGND).

5.10 Components Selection of

Predesigned Circuits

A single schematic diagram, shown in Figure 5-3, can

be used to build power supplies ranging from 3A to 10A

at the common output voltages of 1.8V, 2.5V, 3.3V, and

5V. Components that vary, depending upon output

current and voltage, are listed in Table 5-3 through

Table 5-6.

Power supplies larger than 10A can also be

constructed using the MIC2182 by using larger

power-handling components.

Figure 2-16 through Figure 2-29 provide useful

information about the actual performance of some of

these circuits.

FIGURE 5-3:

Basic Circuit Diagram for use with Table 5-3 through Table 5-6.

TABLE 5-1:

SPECIFICATIONS FOR FIGURE 5-3 & TABLE 5-3 THROUGH TABLE 5-6

Specification

Limit

Switching Frequency Ripple

1% of Output Voltage

Max. Ambient Temp.

+85°C

Short-Circuit Capability

Continuous

Switching Frequency

300 kHz

TABLE 5-2:

COMPONENT SUPPLIERS

Manufacturer

Website Address

Microchip Technology Inc.

www.microchip.com

Kyocera AVX

www.kyocera-avx.com

Central Semiconductor

www.centralsemi.com

Eaton

www.eaton.com

Infineon

www.infineon.com

Vishay

www.vishay.com

Sumida

www.sumida.com

VDD

BST

0.1

μF

100k

VIN

VOUT

GND

2.2nF

1nF

0.1

μF

0.1

μF

0.1

μF

50V

4.7

μF

16V

C11

(table)

SD103BWS

(table)

C12

0.1

μF

50V

(table)

HSD

VSW

LSD

PGND

CSH

VOUT

VREF

SGND

GND

MIC2182

VIN

EN/UVLO

PWM

COMP

SYNC

C13, 1nF

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