MAX8896EREE+T【PDF 14/17 页】IC REG TRPL BCK/LINEAR 16UCSP

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Sheet目录44

10页 11页 12页 13页 [14页]15页 16页 17页

Dual PWM Step-Down Converter in a 2mm x

2mm Package for WCDMA PA and RF Power

14 ______________________________________________________________________________________

Input Capacitor Selection

The input capacitor (C

) reduces the current peaks

drawn from the battery or input power source and

reduces switching noise in the MAX8896. The imped-

ance of C

at the switching frequency should be kept

very low. Ceramic capacitors with X5R or X7R tempera-

ture characteristics are highly recommended due to

their small size, low ESR, and small temperature coeffi-

cients. A 4.7礔 capacitor is recommended for C

IN1

and

2.2礔 for C

IN2

. For optimum noise immunity and low

input ripple, the input capacitor value can be

increased.

Note that some ceramic dielectrics exhibit large capac-

itance and ESR variation with temperature and DC bias.

Ceramic capacitors with Z5U or Y5V temperature char-

acteristics should be avoided.

Thermal Considerations

In most applications, the MAX8896 does not dissipate

much heat due to its high efficiency. But in applications

where the MAX8896 runs at high ambient temperature

with heavy loads, the heat dissipated may exceed the

maximum junction temperature of the part. If the junction

temperature reaches approximately +160癈, the thermal-

overload protection is activated.

2MHz

OUT1

LX1

PGND1

PAOUT

IN1

RFEN1

REFIN

REF

REFBP

*DE2818C

AGND

LDO

IN2

PAEN

CONTROL

PA ENABLE

RF ENABLE 1

ANALOG

CONTROL

2MHz

OUT2

LX2

PGND2

RFEN2

OUT2

1000pF

RF ENABLE 2

2.7V TO 5.5V

0.1礔

4.7礔

0.033礔

2.2礖

BRL2012T 2R2M

2.2礔

(2.8V)

2.2礔

4.7礖*

4.7礔

MAX8896

OUT2

(3.1V)

LDO

OUT2

1礔

Figure 3. Typical Applications Circuit

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