SP6122 datasheet(11/19 Pages) SIPEX

11 / 19 page

Date: 10/02/04

SP6122 Low Voltage, Micro 8, PFET, Buck Controller

Again, for that same 2.2µH application, IPEAK

= 4.6A. Therefore, a 2.2µH inductor with at

least a 5A rating would be desired.

The type of core material to use must also

be determined. For low cost, powdered iron

cores can be used, and they have a gradual

saturation characteristic, but they can cause

ac core loss when the inductor value is low

and ripple current is high. Ferrite cores, on

the other hand, have an abrupt saturation

characteristic and the inductor value drops

sharply when the peak design current is

exceeded. But, ferrites are preferred for

high switching frequencies because they

have low core losses as long as the satura-

tion current is avoided.

Table 1 lists examples of both shielded and

unshielded ferrite core inductors for applica-

tions appropriate for SP6122 applications from

2A to 5A output current. The inductors listed

are both shielded and unshielded, the cus-

tomer can decide what is needed for their

application. For the SP6122 Evaluation Board,

the unshielded ferrite inductor 2.2µH Coilcraft

DO3316P-222 was selected for its cost/per-

formance features.

Guidelines for Component Selection:

continued

INDUCTORS - SURFACE MOUNT Note: Components highlighted in bold are those used on the SP6122 Evaluation Board.

INDUCTOR SPECIFICATION

Inductance

Manufacturer/

Series R

Isat

Size LxWxH

Manufacturer

(µH)

Part No.

(Ω)

(A)

(mm)

Inductor Type

Website

1.5

Coilcraft DO3316P-152

0.010

8.0

12.9x9.4x5.0

Unshielded Ferrite Core

www.coilcraft.com

2.2

Coilcraft DO3316P-222

0.012

7.0

12.9x9.4x5.0

Unshielded Ferrite Core

www.coilcraft.com

3.3

Coilcraft DO3316P-332

0.015

6.4

12.9x9.4x5.0

Unshielded Ferrite Core

www.coilcraft.com

1.5

Sumida CDRH104R-1R5

0.006

10.0

10x10x3.8

Shielded Ferrite Core

www.sumida.com

2.5

Sumida CDRH104R-2R5

0.008

7.5

10x10x3.8

Shielded Ferrite Core

www.sumida.com

3.8

Sumida CDRH104R-3R8

0.010

6.0

10x10x3.8

Shielded Ferrite Core

www.sumida.com

1.5

Murata LQN6C1R5M04

0.019

3.7

5.0x5.7x4.7

Unshielded Ferrite Core

www.murata.com

2.2

Murata LQN6C2R2M04

0.024

3.2

5.0x5.7x4.7

Unshielded Ferrite Core

www.murata.com

3.3

Murata LQN6C3R3M04

0.029

2.7

5.0x5.7x4.7

Unshielded Ferrite Core

www.murata.com

CAPACITORS - SURFACE MOUNT & THROUGH HOLE Note: Components highlighted in bold are those used on the SP6122 Evaluation Board.

CAPACITOR SPECIFICATION

Capacitance

Manufacturer/

ESR

Ripple Current

Size LxWxH

Voltage

Capacitor

Manufacturer

(µF)

Part No.

Ω (max)

(A) @ 25°C

(mm)

(V)

Type

Website

470

SANYO 6TPB470M

0.035

3.0

7343H

10.0

SMT Tant.

www.sanyovideo.com

TDK C4532X5R0J476M

0.005

4.0

1812

6.3

SMT X5R Cer.

www.tdk.com

4.7

TDK C3216X5R1C475M

0.020

4.0

1206

10.0 SMT X5R Cer.

www.tdk.com

100

SANYO 16SA100M

0.030

2.7

8Dx10L

16.0Thru-hole OS-CON www.sanyovideo.com

PMOS SWITCH - SURFACE MOUNT Note: Components highlighted in bold are those used on the SP6122 Evaluation Board.

PMOS SPECIFICATION

RDS(ON)

Gate Charge

Crss

Id (max)

Package

Manufacturer

Manufacturer/Part No.

Ω @ 3.3V

nc @ 3.3V

(pF)

(A)

Type

Website

Fairchild PDS6375

0.022

300

SO-8

www.fairchildsemi.com

Siliconix SI4463DY

0.015

800

SO-8

www.siliconix.com

Intersil ITF86172SK8T

0.023

400

SO-8

www.intersil.com

SCHOTTKY DIODE - SURFACE MOUNT Note: Components highlighted in bold are those used on the SP6122 Evaluation Board.

DIODE SPECIFICATION

VF @ IF

IF(AV)

Size LxWxH

Reverse V

Package

Manufacturer

Manufacturer/Part No.

(V)

(A)

(mm)

(V)

Type

Website

STMicro STPS2L25U

0.50

4.0

5.5x3.9x2.5

SMB

www.st.com

On-Semi MBRD835L

0.50

8.0

9.4x6.7x2.3

DPAK

www.onsemi.com

Table 1: SP6122 Component Selection

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