Rainbow-electronics MAX1870A Manual do Utilizador descarregar pdf (Página 9)

MAX1870A

Step-Up/Step-Down

Li+ Battery Charger

_______________________________________________________________________________________ 9

BATTERY INSERTION AND REMOVAL

MAX1870Atoc01

BATT

18V

16V

CHARGE

5A/div

CCI AND CCV

CCI

CCV

20V

2.00ms/div

BATTERY REMOVAL

BATTERY

INSERTION

CCV

CCI

BATTERY-REMOVAL RESPONSE

MAX1870Atoc02

BATT

21V

18V

20V

19V

16V

17V

10.0µs/div

= 10kΩ, C

OUT

= 22µF

= 10kΩ, C

OUT

= 44µF

= 20kΩ, C

OUT

= 44µF

SYSTEM LOAD-TRANSIENT RESPONSE

MAX1870Atoc03

INDUCTOR CURRENT

SYSTEM LOAD

INPUT CURRENT

BATTERY CURRENT

200µs

STEP-DOWN MODE

SYSTEM LOAD-TRANSIENT RESPONSE

MAX1870Atoc04

INDUCTOR CURRENT

SYSTEM LOAD

INPUT CURRENT

BATTERY CURRENT

100µs

HYBRID MODE

CHARGE-CURRENT STEP RESPONSE

MAX1870Atoc05

INDUCTOR CURRENT

BATTERY CURRENT

CCI

ICTL

400µs

STEP-DOWN

MODE

CHARGE-CURRENT STEP RESPONSE

MAX1870Atoc06

INDUCTOR CURRENT

BATTERY CURRENT

CCI

ICTL

400µs

HYBRID MODE

Typical Operating Characteristics

(Circuit of Figure 1, V

DCIN

= 16V, CELLS = REFIN, V

CLS =

REF

, V

ICTL

= V

REFIN

= 3.3V, T

= +25°C, unless otherwise noted.)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 31 32

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