LP5024 datasheet(17/59 Pages) TI2

17 / 59 page

Bank A

CH3/6/9/12/15/18/21

Bank B

CH4/7/10/13/16/19/22

Bank C

CH5/8/11/14/17/20/23

Independent

Ch0/ /

1 2

Figure 7-6. Bank PWM Control Example (Applicable to LP5024 VQFN and LP5018 VQFN only)

7.3.3 Current Range Setting

The constant-current value (ISET) of all 24 channels is set by a single external resistor, RIREF. The value of RIREF

can be calculated by Equation 1.

IREF =KIREF ×

IREF

SET

(1)

where:

• KIREF = 105

• VIREF = 0.7V

With the IREF pin floating, the output current is close to zero. With the IREF pin shorted to GND, the LP50xx

device provides internal current-limit protection, and the output-channel maximum current is limited to ILIM.

The LP50xx device supports two levels of maximum output current, IMAX.

• When VCC is in the range from 2.7V to 5.5V, and the Max_Current_Option (bit) = 0, IMAX = 25.5mA.

• When VCC is in the range from 3.3V to 5.5V, and the Max_Current_Option (bit) = 1, IMAX = 35mA.

7.3.4 Automatic Power-Save Mode

When all the LED outputs are inactive, the LP50xx device is able to enter power-save mode automatically, thus

lowering idle-current consumption down to 10μA (typical). Automatic power-save mode is enabled when register

bit Power_Save_EN = 1 (default) and all the LEDs are off for a duration of >30ms. Almost all analog blocks are

powered down in power-save mode. If any I2C command to the device occurs, the LP50xx device returns to

NORMAL mode.

7.3.5 Protection Features

7.3.5.1 Thermal Shutdown

The LP50xx device implements a thermal shutdown mechanism to protect the device from damage due to

overheating. When the junction temperature rises to 160°C (typical), the device switches into shutdown mode.

The LP50xx device releases thermal shutdown when the junction temperature of the device is reduced to 145°C

(typical).

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LP5018, LP5024

SLVSEB8C – OCTOBER 2018 – REVISED JULY 2024

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