MAX1577YETA 查看數據表（PDF） - Maxim Integrated

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MAX1577YETA

1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights

Maxim Integrated 

1.2A White LED Regulating Charge Pump for

Camera Flashes and Movie Lights

Pin Description

PIN

NAME

1

EN1

Control Logic Input (see Table 1)

FUNCTION

2

CP

Transfer Capacitor Positive Connection. Connect a 1µF capacitor (or 2.2µF for IOUT > 600mA) from

CP to CN.

3

CN

Transfer Capacitor Negative Connection. Connect a 1µF capacitor (or 2.2µF for IOUT > 600mA) from

CP to CN.

4

EN2

Control Logic Input (see Table 1)

5

GND

Ground

6

IN

Input Supply Voltage. Connect IN to a battery or supply voltage from 2.7V to 5.5V. Connect a 4.7µF

ceramic capacitor from IN to GND.

7

CS

Current-Sense Input. Connect a current-sense resistor from OUT to CS to set the output current.

Connect the anodes of the LEDs to CS and the cathodes to GND.

8

OUT

Output. Connect a 10µF ceramic capacitor from OUT to GND. In shutdown, OUT is pulled to GND

with an internal 5kΩ resistor.

—

EP

Exposed Pad. Connect the exposed pad to GND directly under the IC.

Table 1. Enable, Dimming, Voltage Mode, and Overvoltage Protection

EN1

EN2 DIMMING LEVEL CS THRESHOLD

VOLTAGE MODE

OVP

(VOUT - VCS)

MAX1577Z MAX1577Y MAX1577Z MAX1577Y

0

0

Shutdown

—

—

—

—

—

0

1

20% Current

60mV

5.10V

3.40V

5.30V

5.15V

1

0

33% Current

100mV

5.10V

4.60V

5.30V

5.17V

1

1

100% Current

300mV

5.10V

5.10V

5.30V

5.30V

Note: A “0” indicates EN_ is logic low or connected to GND. A “1” indicates EN_ is logic high or connected to IN.

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