Rainbow-electronics MAX8730 Instrukcja Użytkownika Pobierz pdf (Strona 13)

MAX8730

Low-Cost Battery Charger

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LDO LINE REGULATION

INPUT VOLTAGE (V)

LDO ERROR (%)

MAX8730 toc22

813182328

-0.400

-0.390

-0.380

-0.370

-0.360

-0.350

-0.395

-0.385

-0.375

-0.365

-0.355

REF ERROR vs. TEMPERATURE

TEMPERATURE (°C)

REF ERROR (%)

MAX8730 toc24

-40 -20 0 20 40 60 80

-0.35

-0.30

-0.25

-0.20

-0.15

-0.10

-0.05

REFERENCE LOAD REGULATION

REF

(µA)

REF (%)

MAX8730 toc23

0 100 200 300 400 500

-0.25

-0.23

-0.21

-0.19

-0.17

-0.15

-0.13

-0.11

CHARGER DISABLED

SWREF LOAD REGULATION

SWREF OUTPUT CURRENT (mA)

SWREF ERROR (%)

MAX8730 toc25

010203040

-1.5

-1.2

-0.9

-0.6

-0.3

SWREF VOLTAGE vs. TEMPERATURE

TEMPERATURE (°C)

SWREF VOLTAGE (V)

MAX8730 toc26

-40 -20 0 20 40 60 80

3.25

3.26

3.27

3.28

3.29

3.30

3.31

3.32

DISCONTINUOUS MODE

SWITCHING WAVEFORM

MAX8730toc27

20V

DHI

INDUCTOR

CURRENT

20V

1µs/div

CHARGE

CURRENT = 20mA

Typical Operating Characteristics (continued)

(Circuit of Figure 1, adapter = 19.5V, V

BATT

= 12V, V

ICTL

= 2.4V, MODE > 1.8V, REFON = INPON = LDO, V

RELTH

= V

REF

/2, T

+25°C, unless otherwise noted.)

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Low-Cost Battery Charger 1

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