SC190AEVB datasheet(11/18 Pages) SEMTECH

Part #	SC190AEVB

Description	Synchronous Buck Converter with Programmable Output

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Manufacturer	SEMTECH [Semtech Corporation]

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11

 2005 Semtech Corp.

www.semtech.com

POWER MANAGEMENT

SC190

CIN Selection

The source input current to the SC190 buck converter is

a DC supply current with a triangular ripple riding on it.

To prevent large input voltage ripple a low ESR ceramic

capacitor is required. A minimum value of 4.7µF should

be used for sufﬁcient input voltage ﬁltering and a 10µF

MLCC should be used for optimum input voltage ﬁltering.

Input voltage ripple of approximately 1mV can be achieved

when C

IN = 10µF, and the front-end LDO regulator is active

and pre-regulating the input supply to the switching

regulator. (See page 12: Input Voltage Ripple graphs).

COUT Selection

A 10µF ceramic capacitor is recommended for the output

ﬁlter capacitor. Output voltage ripple is dominated by the

ﬁlter capacitance as shown in the following equation:

Choose an X7R or X5R ceramic dielectric for low ESR and

superior temperature and voltage characteristics. Do not

use Y5V capacitors - their temperature coefﬁcients make

them impractical for this application.

Table 3: Recommended Capacitors

Manufacturer

Part Number

Value

(µF)

Rated Voltage

(VDC)

Type

Case Size

Murata

GRM188R60J475KE19D

4.7

6.3

X5R

0603

Murata

GRM188R60G106ME47D

10

4

X5R

0603

TDK

C1608X5ROG106M

10

4

X5R

0603

Applications Information (Cont.)

)

ESR

(

Cout

)

ripple

(

IL

ripple

_

Vout

•

∆

=

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