SC1517-5 데이터 시트보기 (PDF) - Semtech Corporation

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SC1517-5

MICROPOWER, REGULATED 5V CHARGE PUMP

Semtech Corporation 

MICROPOWER, REGULATED 5V

CHARGE PUMP

SC1517-5

October 3, 2000

The following formula could be used for an

approximation for Vout_ripple.

Capacitor Manufacturers

Vout_ripple

=

Iout

2 x Fosc x Cout

+ Iout

x ESR_ Cout

Figure below shows the effect of output capacitance

value on the ripple voltage. Capacitors used were

multilayer ceramic with low ESR < 0.1 Ohms .

Manufacturer

AVX Corp.

VISHAY

Nichicon Corp.

Phone

(803)-448-9411

(207)-324-4140

(708)-843-7500

Typical Output ripple vs Vin (Iout = 10mA)

muRata

(800)-831-9172

150.0E-3

130.0E-3

110.0E-3

90.0E-3

70.0E-3

50.0E-3

30.0E-3

2.50

3.00

Cout = 3.3uF

Cout = 6.8uF

Cout = 10uF

Cout = 22uF

3.50 4.00 4.50 5.00 5.50

Vin (V)

Following table shows typical capacitor characteristics :

Component

0.1 uF Ceramic 0603 package

ESR ESL

(Ohms) (nH)

0.100 1.60

TOKIN

Taiyo Yuden

Sanyo

(408)-432-8020

(800)-348-2496

(619)-661-6835

LAYOUT CONSIDERATION

Standard power board layout should followed to ensure

proper operation. Any stray inductance should be

minimized, this can be achieved by using large power

planes or traces, and reducing the distances between

input, output and the load. All components should be

placed as close as possible to the SC1517-5.

1.0 uF Ceramic 1206 package 0.120 0.47

10 uF Ceramic 1206 package

0.075 0.5

47 uF, 16V Tantalum D case

0.100 0.60

330 uF, 6.3V “OSCON”

0.025 2.5

330 uF, 16V Al Electrolytic

0.143 2.37

820 uF, 4.0V “OSCON”

0.012 2.5

1000 uF, 10V Al Electrolytic

0.053 5

© 2000 SEMTECH CORP.

9

652 MITCHELL ROAD NEWBURY PARK CA 91320

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