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دیتاشیت - Maxim - Cache-Memory Battery-Backup Management IC

شماره قطعه DS2731
شرح مفصل Cache-Memory Battery-Backup Management IC
تولید کننده Maxim 
آرم Maxim 


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DS2731 شرح
Rev 1; 1/09
Cache-Memory Battery-Backup Management IC
General Description
The DS2731 is a complete power-management solution
for modular backup applications. It is well-suited for 2.5V
and below memory bus voltages, with an input voltage of
12V. The DS2731 includes an internal MOSFET switching
power stage for charging a one-cell lithium chemistry bat-
tery. It has a fully integrated synchronous buck regulator
capable of supplying up to 450mA of cache backup sup-
ply current, and the necessary logic and power devices
for handling the switchover from system power to battery
power. The battery charging method of the DS2731 is
constant current/constant voltage (CCCV). Output voltage
can be margined from 3.8V to 4.6V using a resistor-
divider. Charge is terminated when the charging current
falls below 5% of full charge current. Switchover to battery
backup is initiated by an internal comparator and occurs
automatically when a sensed-input voltage drops below
2.93V. At light loads, the 2MHz internal synchronous buck
regulator operates in burst mode for maximum efficiency.
All nonessential functions of the DS2731 are disabled
while supplying holdup current to the cache memory, and
the IC goes into very low-current dormant mode when the
battery voltage drops below a user-settable threshold.
The DS2731 keeps track of charge status and signals the
user through open-drain I/O pins that can be used to
drive LEDs.
RAID Controller Card
Applications
Typical Operating Circuit
Features
o Lithium Chemistry CCCV Charger
o Adjustable Regulated Charging Up to 1.5A DC
o Adjustable Charge Voltage from 3.8V to 4.6V
o External and Internal Thermal Protection
o Safety Timer Secondary Termination
o LED Indicator Outputs
o Detects Power Outage and Switches Between
Normal Power and Backup Battery
o Adjustable High-Efficiency Synchronous Buck
Regulator with Skip Mode at Light Loads
o Low-Power Consumption in Discharge Mode
Ordering Information
PART
TEMP RANGE PIN-
PACKAGE
TOP
MARK
DS2731E+
-20°C to +70°C 28 TSSOP-EP* DS2731
(173 mils)
DS2731E+T&R -20°C to +70°C 28 TSSOP-EP*
(173 mils)
+Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
*EP = Exposed pad.
DS2731
Pin Configuration
MAIN
POWER
AUXILIARY
POWER
DS2731
SWITCH MODE
CHARGER
(CCCV)
POWER
MANAGEMENT
SWITCHING
REGULATOR
LITHIUM
BACKUP
CELL
CACHE
MEMORY
TOP VIEW
MARGIN
STMR
CTG
AUX
CBIAS
VREG
CIN
LX
SGND
AGND
REF
LO_BATT
DIV
ENS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
*EXPOSED PAD
DS2731
*EP
TSSOP
28 THM
27 RSET
26 BATT+
25 SNS
24 CGATE
23 VIN
22 CHG1
21 CHG2
20 CGND1
19 CGND2
18 CHARGE
17 FAULT
16 DONE
15 ENC
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Free Datasheet http://www.Datasheet4U.com

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