VDD

LED 7

LED 0

LP3944

LM2750-5.0

VIN

VOUT

CAP+

CAP-

CFLY

1 PF

2.2 PF

2.7V to 5.5V

2.2 PF

LP3944

SNVS264A – MAY 2004 – REVISED APRIL 2013

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Reducing IQ When LEDs are Off

In many applications, the LEDs and the LP3944 share the same VDD, as shown in Typical Application Circuit.

When the LEDs are off, the LED pins are at a lower potential than VDD, causing extra supply current (ΔIQ). To

minimize this current, consider keeping the LED pins at a voltage equal to or greater than VDD.

Figure 12. Methods to Reduce IQ When LEDs Are Off

Figure 13. Application Circuit

12

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