Rainbow-electronics MAX1821 Manual do Utilizador descarregar pdf (Página 16)

MAX1820/MAX1821

WCDMA Cellular Phone 600mA

Buck Regulators

16 ______________________________________________________________________________________

SYNC

GND

SHDN

BATT

PGND

COMP

REF

MAX1821

SKIP

INPUT

2.6V TO

5.5V

OUTPUT

1.25V TO 5.5V

Typical Operating Circuits (continued)

SYNC

BATT

LXREF

( ) ARE FOR MAX1821 ONLY.

OUT (FB)

COMP

SKIP

MAX1820

MAX1821

µMAX

TOP VIEW

PGNDGND

SHDN

COMP OUT (FB)

SYNC

BATT LX

UCSP

TOP VIEW AFTER ASSEMBLED ON PC BOARD (BUMPS AT THE BOTTOM)

( ) ARE FOR MAX1821 ONLY.

A1 A3A2

C1 C2 C3

GND

PGND

REFSKIP

SHDN

Pin Configurations

Ordering Information (continued)

PART

SYNC

FREQ (MHz)

OUTPUT VOLTAGE TEMP RANGE PIN-PACKAGE UCSP MARK

MAX1821EBC*

No Sync

Programmable -40°C to +85°C3

4 UCSP AAC

MAX1821EUB

No Sync

Programmable -40°C to +85°C 10 µMAX —

MAX1821XEBC*

Programmable -40°C to +85°C3

4 UCSP AAV

MAX1821XEUB

Programmable -40°C to +85°C10 µMAX —

*UCSP reliability is integrally linked to the user’s assembly methods, circuit board material, and environment. Refer to the UCSP

Reliability Notice in the UCSP Reliability section for more information.

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