MAX8568B Maxim Integrated Products, MAX8568B Datasheet
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MAX8568B
Manufacturer Part Number
MAX8568B
Description
(MAX8568A/B) Complete Backup-Management ICs
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX8568B.pdf
(17 pages)
www.DataSheet.co.kr
The MAX8568A/MAX8568B backup-battery-management
ICs are complete charging and backup switchover con-
trol solutions for PDAs, Smart Phones, and other smart
portable devices. They charge both NiMH and
rechargeable lithium battery types and feature pro-
grammable charge current and termination voltage.
Separate optimized charge algorithms for both lithium
and NiMH cells are included on-chip.
The MAX8568A/MAX8568B also manage backup
switchover from a primary power source. An accurate on-
chip voltage detector monitors the main supply and
backs up two system supplies (typically I/O and memory)
when main power falls. On-chip drivers switch external
MOSFETs to disconnect the main supply from the system
loads so the backup source is not drained.
Low-voltage backup cells can be stepped up by an on-
chip synchronous-rectified, low-quiescent-current boost
converter. Additionally, a low-quiescent-current LDO gen-
erates a second backup voltage. The MAX8568A LDO is
preset to 2.5V while the MAX8568B LDO is preset to 1.8V.
Both devices are supplied in 16-pin 3mm x 3mm thin
QFN packages rated for -40°C to +85°C operation.
19-3450; Rev 1; 5/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
TOP VIEW
PDAs and PDA Phones
Smart Phones
DSCs and DVCs
Palmtops and Wireless Handhelds
Internet Appliances and Web-Books
TERMV
STRTV
GND
REF
13
14
15
16
________________________________________________________________ Maxim Integrated Products
12
1
General Description
THIN QFN
MAX8568A
MAX8568B
Pin Configuration
11
2
Complete Backup-Management ICs
10
3
Applications
4
9
for Lithium and NiMH Batteries
8
7
6
5
OD2
OD1
LDO
BKSU
♦ Automatically Manage All Backup Switchover
♦ Charge Both NiMH and Rechargeable Lithium
♦ On-Chip Battery Boost Converter for 1-Cell NiMH
♦ Two Backup Output Voltages
♦ Programmable Charge Current
♦ Programmable Charge Voltage Limit
♦ Low 17µA Operating Current in Backup Mode
♦ Eliminate Many Discrete Components
♦ Tiny 3mm x 3mm Thin QFN Package
MAX8568AETE
MAX8568BETE
Functions
Backup Batteries
PART
MAIN BATTERY
2.8V TO 5.5V
I/O OUT
3.3V, 50mA
I/O IN
MEM OUT
1.8V OR 2.5V, 10mA
MEM IN
BACKUP
BATTERY
Typical Operating Circuit
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
IN
BK
LX
BKSU
PGND
BKV
OD1
LDO
OD2
MAX8568A
MAX8568B
PIN-
PACKAGE
16 Thin QFN
3mm x 3mm
(T1633-4)
16 Thin QFN
3mm x 3mm
(T1633-4)
TERMV
STRTV
INOK
CHGI
NI/LI
GND
REF
NI
Features
LI
IN
MARK
TOP
ACK
ACL
1
Datasheet pdf - http://www.DataSheet4U.net/