744025 查看數據表（PDF） - Microchip Technology

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744025

High Voltage Input Integrated Switch Step-Down Regulator

Microchip Technology 

TABLE 5-3: MCP16301 RECOMMENDED

3.3V INDUCTORS

Part Number

Coilcraft®

ME3220

15

LPS4414

15

LPS6235

15

MSS6132

15

MSS7341

15

ME3220

15

XFL2006

15

LPS3015

15

Wurth Elektronik®

744028

15

744029

15

744025

15

744031

15

744042

15

Coiltronics®

SD12

15

SD18

15

SD20

15

SD3118

15

SD52

15

Sumida®

CDPH4D19F

15

CDRH2D09C

15

CDRH2D162D 15

CDRH3D161H 15

TDK - EPC®

VLF3012A

15

VLF30251

15

VLF4012A

15

VLF5014A

15

B82462G4332M 15

Size

WxLxH

(mm)

0.52 0.90 3.2x2.521.0

0.440 0.92 4.3x4.3x1.4

0.125 2.00 6.0x6.0x3.5

0.135 1.56 6.1x6.1x3.2

0.057 1.78 7.3x7.3x4.1

0.520 0.8 2.8x3.2x2.0

2.02 0.25 2.0x2.0x0.6

0.700 0.61 3.0x3.0x1.4

0.750 0.35 2.8x2.8x1.1

0.600 0.42 2.8x2.8x1.35

0.400 0.900 2.8x2.8x2.8

0.255 0.450 3.8x3.8x1.65

0.175 0.75 4.8x4.8x1.8

0.48 0.692 5.2x5.2x1.2

0.266 0.831 5.2x5.2x1.8

0.193 0.718 5.2x5.2x2.0

0.51 0.75 3.2x3.2x1.8

0.189 0.88 5.2x5.5.2.0

0.075 0.66

0.52 0.24

0.198 0.35

0.328 0.65

5.2x5.2x2.0

3.2x3.2x1.0

3.2x3.2x1.8

4.0x4.0x1.8

0.54 0.41

0.5 0.47

0.46 0.63

0.28 0.97

0.097 1.05

2.8x2.6x1.2

2.5x3.0x1.2

3.5x3.7x1.2

4.5x4.7x1.4

6x6x2.2

© 2011 Microchip Technology Inc.

MCP16301

5.7 Freewheeling Diode

The freewheeling diode creates a path for inductor cur-

rent flow after the internal switch is turned off. The aver-

age diode current is dependent upon output load

current at duty cycle (D). The efficiency of the converter

is a function of the forward drop and speed of the free-

wheeling diode. A low forward drop Schottky diode is

recommended. The current rating and voltage rating of

the diode is application dependent. The diode voltage

rating should be a minimum of VIN, plus margin. For

example, a diode rating of 40V should be used for an

application with a maximum input of 30V. The average

diode current can be calculated using Equation 5-6.

EQUATION 5-6: DIODE AVERAGE

CURRENT

ID1AVG = (1 – D) × IOUT

EXAMPLE 5-4:

IOUT

VIN

VOUT

D

ID1AVG

= 0.5A

= 15V

= 5V

= 5/15

= 333 mA

A 0.5A to 1A diode is recommended.

TABLE 5-4: FREEWHEELING DIODES

App

Manufacturer

Part

Number

Rating

12 VIN

600 mA

24 VIN

100 mA

18 VIN

600 mA

Diodes

Inc.

Diodes

Inc.

Diodes

Inc.

DFLS120L-7 20V, 1A

B0540Ws-7 40V, 0.5A

B130L-13-F 30V, 1A

5.8 Boost Diode

The boost diode is used to provide a charging path from

the low voltage gate drive source, while the switch

node is low. The boost diode blocks the high voltage of

the switch node from feeding back into the output volt-

age when the switch is turned on, forcing the switch

node high.

A standard 1N4148 ultra-fast diode is recommended

for its recovery speed, high voltage blocking capability,

availability and cost. The voltage rating required for the

boost diode is VIN.

For low boost voltage applications, a small Schottky

diode with the appropriately rated voltage can be used

to lower the forward drop, increasing the boost supply

for gate drive.

DS25004A-page 19

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