Rainbow-electronics MAX8805Z Manual de usuario descargar pdf (Pagina 15)

MAX8805Y/MAX8805Z

600mA PWM Step-Down Converters in

2mm x 2mm WLP for WCDMA PA Power

______________________________________________________________________________________ 15

Input Capacitor Selection

The input capacitor (C

IN1

) of the PA converter reduces

the current peaks drawn from the battery or input

power source and reduces switching noise in the

MAX8805Y/MAX8805Z. The impedance of C

IN1

at the

switching frequency should be kept very low. Ceramic

capacitors with X5R or X7R dielectric are highly recom-

mended due to their small size, low ESR, and small

temperature coefficients. A 2.2µF capacitor is recom-

mended for most applications. For optimum noise

immunity and low input ripple, the input capacitor value

can be increased.

For the LDOs, use an input capacitance equal to the

value of the sum of the output capacitance of LDO1 and

LDO2. Larger input capacitor values and lower ESR pro-

vide better noise rejection and line transient response.

Note that some ceramic dielectrics exhibit large capaci-

tance and ESR variation with temperature. With

dielectrics such as Z5U and Y5V, it may be necessary to

use two times the sum of the output capacitor values of

LDO1 and LDO2 (or larger) to ensure stability at temper-

atures below -10°C. With X7R or X5R dielectrics, a

capacitance equal to the sum is sufficient at all operating

temperatures.

Table 2. Suggested Inductors

MANUFACTURER

SERIES

INDUCTANCE

(µH)

ESR

(Ω)

CURRENT RATING

(mA)

DIMENSIONS

(mm)

Coilcraft LPO3310

1.0

1.5

2.2

0.07

0.10

0.13

1600

1400

1100

3.3 x 3.3 x 1.0 = 11mm

MIPF2520

1.0

1.5

2.2

0.05

0.07

0.08

1500

1300

2.5 x 2.0 x 1.0 = 5mm

MIPS2520

1.3

2.0

0.09

0.11

1500

1200

2.5 x 2.0 x 1.0 = 5mm

FDK

MIPF2016

1.0

2.2

0.11 1100

2.0 x 1.6 x 1.0 = 3.2mm

Hitachi

KSLI-252010

1.5

2.2

0.115

0.080

—

2.5 x 2.0 x 1.0 = 5mm

Murata LQH32C_53

1.0

2.2

0.06

0.10

1000

790

3.2 x 2.5 x 1.7 = 14mm

Sumida CDRH2D09

1.2

1.5

2.2

0.08

0.09

0.12

590

520

440

3.0 x 3.0 x 1.0 = 9mm

CDRH2D11

1.5

2.2

3.3

0.05

0.08

0.10

680

580

450

3.2 x 3.2 x 1.2 = 12mm

Taiyo Yuden

CB2518T

2.2

4.7

0.09

0.13

510

340

2.5 x 1.8 x 2.0 = 9mm

D3010FB 1.0 0.20 1170

3.0 x 3.0 x 1.0 = 9mm

D2812C

1.2

2.2

0.09

0.15

860

640

3.0 x 3.0 x 1.2 = 11mm

D310F

1.5

2.2

0.13

0.17

1230

1080

3.6 x 3.6 x 1.0 = 13mm

TOKO

D312C

1.5

2.2

0.10

0.12

1290

1140

3.6 x 3.6 x 1.2 = 16mm

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 21

MAX8805Y/MAX8805Z 1

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Rainbow-electronics MAX8805Z Manual de usuario Pagina 15

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