MAX8822ETE 查看數據表（PDF） - Maxim Integrated

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MAX8822ETE

Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN

Maxim Integrated 

Ultra-Efficient Negative Charge-Pump LED

Driver with Dual LDOs in 3mm x 3mm Thin QFN

PIN

1

2

3

4

5

6

7

8–11

12

13

14

15

16

—

Pin Description

NAME

IN

GND

C1P

C2P

C2N

C1N

NEG

FUNCTION

Supply Voltage Input. Bypass IN to GND with a 4.7µF ceramic capacitor placed as close as possible

to the IC. The input voltage range is 2.7V to 5.5V.

Ground. Connect to system ground. GND is used for charge-pump switching currents.

Transfer Capacitor 1 Positive Connection. Connect a 1µF ceramic capacitor from C1P to C1N.

Transfer Capacitor 2 Positive Connection. Connect a 1µF ceramic capacitor from C2P to C2N.

Transfer Capacitor 2 Negative Connection. Connect a 1µF ceramic capacitor from C2P to C2N.

Transfer Capacitor 1 Negative Connection. Connect a 1µF ceramic capacitor from C1P to C1N.

Charge-Pump Output. Bypass NEG to GND with a 2.2µF ceramic capacitor placed as close as

possible to the IC.

LED4–LED1

LED Current Regulators. Connect LED_ to the cathodes of the external LEDs. LED_ is high

impedance in shutdown. Connect any unused LED_ to IN to disable the corresponding current

regulator. LED_ current is programmed by pulsing ENLED as described in the LED Dimming Control

section.

LDO1

LDO1 Output. Bypass LDO1 to GND with a 1µF ceramic capacitor placed as close as possible to the IC.

The LDO1 and LDO2 output voltage combination is selected by pulsing ENLDO low. See the LDO1/LDO2

Output Voltage Control section.

LDO2

LDO2 Output. Bypass LDO2 to GND with a 1µF ceramic capacitor placed as close as possible to the IC.

The LDO1 and LDO2 output voltage combination is selected by pulsing ENLDO low. See the LDO1/LDO2

Output Voltage Control section.

ENLED

ENLDO

REF

EP

WLED Enable and Dimming Control Input. Pulse ENLED low to program LED_ current. Hold ENLED

low for at least 2.5ms to place the LED drivers in shutdown. See the LED Dimming Control section.

LDO Enable and Voltage Control Input. Pulse ENLDO low to program the output voltage of both

LDO1 and LDO2 to one of sixteen different combinations. Hold ENLDO low for at least 2.5ms to

place the LDOs in shutdown. See the LDO1/LDO2 Output Voltage Control section.

Reference. Bypass REF to GND with a 0.1µF ceramic capacitor placed as close as possible to the IC.

VREF regulates to 1.2V (typ).

Exposed Paddle. Connect EP to GND. For good thermal dissipation, solder the exposed paddle to

the power ground plane.

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