Rainbow Electronics MAX1821 - Manual (Page 16)

MAX1820/MAX1821
WCDMA Cellular Phone 600mA
Buck Regulators
16 ______________________________________________________________________________________
SYNC
GND
SHDN
BATT
PGND
COMP
REF
LX
FB
MAX1821
SKIP
INPUT
2.6V TO
5.5V
OUTPUT
1.25V TO 5.5V
Typical Operating Circuits (continued)
1
2
3
4
5
10
9
8
7
6
SYNC
BATT
LX REF
( ) ARE FOR MAX1821 ONLY.
OUT (FB)
COMP
SKIP
MAX1820
MAX1821
µMAX
TOP VIEW
PGND GND
SHDN
COMP OUT (FB)
SYNC
BATT LX
UCSP
TOP VIEW AFTER ASSEMBLED ON PC BOARD (BUMPS AT THE BOTTOM)
( ) ARE FOR MAX1821 ONLY.
A1 A3 A2
B1
C1 C2 C3
A
B
C
1 2 3
GND
PGND
A4
B4
C4
4
REF SKIP
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°C 3 ✕ 4 UCSP AAC
MAX1821EUB No Sync Programmable -40°C to +85°C 10 µMAX —
MAX1821XEBC* 13 Programmable -40°C to +85°C 3 ✕ 4 UCSP AAV
MAX1821XEUB 13 Programmable -40°C to +85°C 10 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.