Rainbow-electronics MAX4981 Bedienungsanleitung PDF herunterladen (Seite 6)

MAX4978–MAX4981

Overvoltage Protector with

Active Current Limit

6 _______________________________________________________________________________________

Pin Description

MAX4978/

MAX4979

MAX4980/

MAX4981

NAME FUNCTION

11IN

Supply Voltage Input. IN powers the charge pump required to turn on the internal FET.

When the correct adapter is plugged in, a 160ms debounce timer prevents a false turn-on of

the internal FET. Bypass IN to GND with a 1µF ceramic capacitor as close to the device as

possible to enable ±15kV (HBM) ESD protection.

2—SDT

Startup Debounce Time Indicator. SDT is an active-low open-drain output that asserts low

during the debounce/autoretry time.

— 2 BAT

Battery Monitor Input. Connect BAT to Li-ion battery terminal. Bypass BAT to GND with a 1µF

ceramic capacitor as close to the device as possible to enable ±15kV (HBM) ESD protection.

3, 6, 7 3, 6, 7 I.C. Internally Connected. Connect I.C. to GND.

44EN Acti ve- Low E nab l e Inp ut. D r i ve E N l ow for nor m al op er ati on. D r i ve E N hi g h to d i sab l e the d evi ce.

5 5 GND Ground

8 8 OUT Output Voltage. Output of internal FET.

——EP

Exposed Pad. Internally connected to GND. Connect EP to a large ground plane to maximize

thermal performance. Do not use EP as the sole GND connection.

Typical Operating Characteristics (continued)

= 5.0V, EN = GND, T

= +25°C, unless otherwise noted.)

UNDERVOLTAGE FAULT RESPONSE

MAX4978-81 toc10

4μs/div

2V/div

OUT

BATTERY OVERVOLTAGE FAULT RESPONSE

MAX4978-81 toc11

2μs/div

= 1kΩ

2V/div

BAT

OUT

SHORT-CIRCUIT RESPONSE

MAX4978-81toc12

100ms/div

5V/div

1A/div

OUT

SDT

1 2 3 4 5 6 7 8 9 10

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