Datasheet

Datasheet

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BU1840AMUV

TSZ02201-0Q1Q0AJ00130-1-2

© 2012 ROHM Co., Ltd. All rights reserved.

2.AUG.2012 Rev.001

TSZ22111・15・001

www.rohm.com

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Charging Current Sense Register (R1)

It is necessary to decide the constant of R1 in proportion to the maximum charge current.

Maximum charging current ＝ “Maximum input power” × “Efficiency” ÷ “Voltage of battery”

Maximum

charging

current [mA]

R1 [mΩ]

Maximum

charging

current [mA]

R1 [mΩ]

60

560

350

100

80

470

400

100

100

390

480

82

120

330

580

68

150

220

700

56

200

180

820

47

250

150

1000

39

300

120

1200

33

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Charging Current Data

The current for each 1bit of the charge current data is decided by the following calculating formula

Charging current＝(Charging current data[Hex]－2B[Hex]) × ”Charging current / 1bit”

R1 [mΩ]

Charging

current/1bit

[mA]

R1 [mΩ]

Charging

current/1bit

[mA]

33

9.685

150

2.131

39

8.195

180

1.776

47

6.800

220

1.453

56

5.707

270

1.184

68

4.700

330

0.9685

82

3.898

390

0.8195

100

3.196

470

0.6800

120

2.663

560

0.5707