Rainbow-electronics MAX1870A Bedienungsanleitung PDF herunterladen (Seite 11)

MAX1870A

Step-Up/Step-Down

Li+ Battery Charger

______________________________________________________________________________________ 11

Typical Operating Characteristics (continued)

(Circuit of Figure 1, V

DCIN

= 16V, CELLS = REFIN, V

CLS =

REF

, V

ICTL

= V

REFIN

= 3.3V, T

= +25°C, unless otherwise noted.)

REF LOAD REGULATION

MAX1870A toc16

LOAD CURRENT (µA)

REF

(V)

20001000500 1500

4.04

4.05

4.06

4.08

4.07

4.10

4.09

4.11

4.03

0 2500

REFERENCE ERROR vs. TEMPERATURE

MAX1870Atoc17

TEMPERATURE (°C)

REFERENCE ERROR (%)

806020 400-20

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

-40 100

LDO LOAD REGULATION

MAX1870A toc18

LOAD (mA)

LDO

(V)

403010 20

5.26

5.32

5.28

5.36

5.30

5.34

5.38

5.24

050

28V

16V

LDO vs. TEMPERATURE

MAX1870A toc19

TEMPERATURE (°C)

LDO VOLTAGE ERROR (%)

8040-20 06020

-0.2

0.2

0.6

0.4

0.8

-0.4

-40 100

OUTPUT VOLTAGE RIPPLE

vs. BATTERY VOLTAGE

MAX1870Atoc20

BATT

(V)

RMS OUTPUT RIPPLE (mV)

15105

100

120

140

160

180

020

STEP-UP/STEP-DOWN

SWITCHING WAVEFORM

MAX1870Atoc21

10V

CATHODE

D3 ANODE

INDUCTOR CURRENT

BATT

(AC-COUPLED)

200mV/div

10V

20V

2.00µs

= 16V

BATT

= 16V

STEP-DOWN

SWITCHING WAVEFORM

MAX1870Atoc22

10V

CATHODE

D3 ANODE

INDUCTOR CURRENT

BATT

(AC-COUPLED)

10mV/div

10V

20V

2.00µs

= 16V

BATT

= 12V

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 31 32

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