DS2731K Maxim Integrated, DS2731K Datasheet

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DS2731K

Manufacturer Part Number
DS2731K
Description
Power Management IC Development Tools
Manufacturer
Maxim Integrated
Series
DS2731r
Datasheet
1.DS2731K.pdf (9 pages)
The DS2731 evaluation kit (EV kit) demonstrates all the
features of the DS2731 battery-backup power-man-
agement IC. The EV kit includes an assembled and
tested PCB for easy connection to power sources and
a load. Three power sources—a 3.3V auxiliary supply,
a 12V supply, and a single lithium-ion (Li+) battery—
connect to the DS2731 EV kit to supply the high-effi-
ciency, synchronous buck regulator and battery
charger. The IC automatically selects the best-quali-
fied power source for the buck regulator. Thresholds
for low-battery voltage, charge regulation voltage and
current, charge safety timer, and buck-output voltage
are set by resistors.
19-4842; Rev 1; 10/09
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.
DESIGNATION
C2, C3, C6
C1, C7
C4, C5
JP1
JP2
L1
L2
R1
R2
R3
G
R
QTY
________________________________________________________________ Maxim Integrated Products
2
3
2
1
1
1
1
1
1
1
1
1
10μF ceramic SMT capacitors
47μF ceramic SMT capacitors
22μF ceramic SMT capacitors
Green LED
L62305CT
No power
0 resistor (0603)
2.2μH power inductor
6.8μH power inductor
Red LED
L62301CT
56.2k
10.2k
590k
General Description
resistor (0603)
resistor (0603)
resistor (0603)
DESCRIPTION
♦ Convenient Power Source and Load Connections
♦ LEDs Indicate Charge Status
♦ Automatic Power-Source Selection
♦ Space for a Wide Variety of Inductor Sizes
♦ Proven, Compact and Low-Cost PCB Layout
♦ Fully Assembled
+ Denotes lead(Pb)-free and RoHS compliant.
DS2731EVKIT+
DESIGNATION
DS2731 Evaluation Kit
R6, R7, R8,
R11, R12
THM1
PART
R13
R4
R5
R9
U1
—
Y
QTY
1
1
5
1
1
1
1
1
1
Ordering Information
240k
360k
4.7k
0.05k
2.49k
103AT-2 thermistor
Cache-memory battery-backup
management IC (28 TSSOP)
DS2731E+
Yellow LED
L62307CT
PCB: DS2731 Evaluation Kit+
resistor (0603)
resistor (0603)
resistor (0603)
resistor (1206)
resistor (0603)
Component List
DESCRIPTION
Features
TYPE
EV Kit
1

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DS2731K Summary of contents

Page 1

... R3 1 590k resistor (0603) ________________________________________________________________ Maxim Integrated Products 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. DS2731 Evaluation Kit ♦ Convenient Power Source and Load Connections ♦ LEDs Indicate Charge Status ♦ ...

Page 2

DS2731 Evaluation Kit Quick Start Sequence Required Equipment Before beginning, the following equipment is needed: • DS2731 EV Kit Board • +12V Power Supply • +3.3V Power Supply • +4.2V Li+ Battery • Voltmeter • Connecting Wires Optional Equipment The ...

Page 3

Board Configuration Charger/Buck Regulator Enables The charger circuitry can be disabled by removing the 0Ω resistor on JP2. The board is shipped with the 0Ω resistor in place (charger enabled). Similarly, the buck regulator can be disabled by pulling ENS ...

Page 4

DS2731 Evaluation Kit power is cycled or the ENC pin is strobed low and then returns high. The timer does not start until CC mode is entered and continues through CV mode; precharge mode is not included in the STMR. ...

Page 5

VIN C5 22μF 22μ CGND J5 1 AUX+ R12 JP2 4.7kΩ R11 0Ω 4.7Ω JP1 NP C1 10μ 590kΩ 240kΩ R1 56.2kΩ R13 2.49kΩ Figure 3. DS2731 EV Kit Board ...

Page 6

DS2731 Evaluation Kit Figure 4. DS2731 EV Kit Board—Top View 6 _______________________________________________________________________________________ ...

Page 7

Figure 5. DS2731 EV Kit Board—Middle Layer _______________________________________________________________________________________ DS2731 Evaluation Kit 7 ...

Page 8

DS2731 Evaluation Kit Figure 6. DS2731 EV Kit Board—Bottom Layer 8 _______________________________________________________________________________________ ...

Page 9

... NUMBER DATE 0 1/09 Initial release. Changed the part number in the Ordering Information table from DS2731K to 1 10/09 DS2731EVKIT+. Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. ...

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