1.2A White LED Regulating Charge Pump for

Camera Flashes and Movie Lights

_______________________________________________________________________________________

7

MAX1577Z

C1

2.2

µF*

5.3V OVP

100mV OR 60mV)

UP TO 1.2A

2.7V TO 5.5V

4.7

µF

10

µF

100%, 33%, 20%,

AND SHUTDOWN

CP

CN

EN1

IN

OUT

CS

GND

EN2

*1

µF FOR LESS THAN 600mA OUTPUT.

OR

MAX1577Y

C1

1

µF

5.1V, 4.6V, OR 3.4V

2.7V TO 5.5V

4.7

µF

10

µF

5.1V, 4.6V, 3.4V

AND SHUTDOWN

CP

CN

EN1

IN

OUT

CS

GND

EN2

Figure 2. Current Regulation with the MAX1577Z

Figure 3. Voltage Regulation with the MAX1577Y