ILC6383 データシートの表示（PDF） - Fairchild Semiconductor

部品番号

コンポーネント説明

メーカー

ILC6383

1-Cell to 3-Cell Boost DC-DC Converter with True Load Disconnect, 3.3V, 5V or Adjustable Output

Fairchild Semiconductor 

PRODUCT SPECIFICATION

ILC6383

External Component Selection

Inductors

The ILC6383 is designed to work with a 15µH inductor in

most applications. There are several vendors who supply

standard surface mount inductors to this value. Suggested

suppliers are shown in Table 1. Higher values of inductance

will improve efficiency, but will reduce peak inductor current

and consequently ripple and noise, but will also limit output

current.

Vendor

Coilcraft

muRata

Sumida

TDK

Part No.

D03308P-153

D03316P-153

D01608C-153

LQH4N150K

LQH3C150K

CDR74B-150MC

CD43-150

CD54-150

NLC453232T-150K

Contact

(847) 639-6400

(814) 237-1431

(847) 956-0666

(847) 390-4373

Capacitors

Input Capacitor

The input capacitor is necessary to minimize the peak

current drawn from the battery. Typically a 10µF tantalum

capacitor is recommended. Low equivalent series resistance

(ESR) capacitors will help to minimize battery voltage

ripple.

Output Capacitor

Low ESR capacitors should be used at the output of the

ILC6383 to minimize output ripple. The high switching

speeds and fast changes in the output capacitor current, mean

that the equivalent series impedance of the capacitor can

contribute greatly to the output ripple. In order to minimize

these effects choose an output capacitor with less than 10nH

of equivalent series inductance (ESL) and less than 100mΩ

of equivalent series resistance (ESR). Typically these charac-

teristics are met with ceramic capacitors, but may also be

met with certain types of tantalum capacitors. Suitable

vendors are shown in Table 2.

Description

T495 series tantalum

595D series tantalum

TAJ, TPS series

tantalum

X5R, X7R Ceramic

Vendor

Kemet

Sprague

AVX

TDK

AVX

muRata

Contact

(864) 963-6300

(603) 224-1961

(803) 946-0690

(847) 390-4373

(803) 946-0690

www.murata.com

Layout and Grounding Considerations

High frequency switching and large peak currents means

PCB design for DC-DC converters requires careful consider-

ation. As a general rule, place the DC-DC converter

circuitry well away from any sensitive RF or analog compo-

nents. The layout of the DC-DC converters and its external

components are also based on some simple rules to minimize

EMI and output voltage ripple.

Layout

1. Place all power components, ILC6383, inductor, input

capacitor and output capacitor as close together as

possible.

2. Keep the output capacitor as close to the ILC6383 as

possible with very short traces to the VOUT and GND

pins. Typically it should be within 0.25 inches or 6mm.

3. Keep the traces for the power components wide,

typically >50mil or 1.25mm.

4. Place the external networks for LBI and VFB close to the

ILC6383, but away from the power components as far as

possible.

Grounding

1. Use a star grounding system with separate traces for the

power ground and the low power signals such as LBI/

SD and VFB. The star should radiate from where the

power supply enters the PCB.

2. On multilayer boards use component side copper for

grounding around the ILC6383 and connect back to a

quiet ground plane using vias.

CIN

47µF

VIN

L1

15µH

ILC6383

1

LX

2 VIN

VOUT 8 + COUT

47µF

GND 7

R1

VOUT

R3

3 LBI/SD LBO 6

ON/OFF

PWM

4 SEL

VFB 5

PFM

R2

Local "Quiet" Ground

Power Ground

Recommended application circuit

schematic for ILC6383CIR-ADJ

REV. 1.2.6 6/13/02

9

Share Link: