Rainbow-electronics MAX1765 Bedienungsanleitung PDF herunterladen (Seite 18)

MAX1765

the regulator turns on. The switch must be pressed

long enough for the microcontroller (µC) to exit reset

and drive ONA high. A small capacitor is added to help

debounce the switch. The µC issues a logic high to

ONA, which holds the device on, regardless of the

switch state. To turn the regulator off, press the switch

again, allowing the µC to read the switch status and

pull ONA low. When the switch is released, ONB is

pulled high.

800mA, Low-Noise, Step-Up DC-DC Converter

with 500mA Linear Regulator

18 ______________________________________________________________________________________

Table 5. Typical Available Output Current

NUMBER OF CELLS

INPUT VOLTAGE

(V)

OUTPUT VOLTAGE

(V)

OUTPUT CURRENT

(mA)

1 NiCd/NiMH 1.2 3.3 330

2.4 3.3 730

2 NiCd/NiMH

2.4 5.0 460

3 NiCd/NiMH or 1 Li+ 3.6 5.0 720

LX POUT

GND OUTL

CONTROL

INPUTS

µC

I/O

MAX1765

INL

µC

I/O

ONA

ONB

POUT

I/O

0.1µF

ON/OFF

270k

MAX1765

Chip Information

TRANSISTOR COUNT: 1735

Figure 10. Typical Phone Application

Figure 11. Momentary Pushbutton On/Off Switch

1 2 ... 13 14 15 16 17 18 19

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