LP5811中文資料德州儀器數(shù)據(jù)手冊(cè)PDF規(guī)格書(shū)

1 Features

? Operating voltage range:

– Input voltage (VIN) range: 0.5 V to 5.5 V

– 1.8-V minimum input voltage for start-up

– Logic pins compatible with 1.8 V, 3.3 V, and 5 V

? High efficiency synchronous boost converter

– Output voltage (VOUT) range: 3 V to 5.5 V

– 140-mΩ (HS) / 60-mΩ (LS) MOSFETs

– 1.6-A valley switching current limit

– 95 efficiency at VIN = 4.2 V, VOUT = 5.0 V,

IOUT = 300 mA

– Pass-through mode when VIN > VOUT setting

– True disconnection between input and output

during shutdown

? Time-cross-multiplexing (TCM) topology:

– Drives up to 12 LEDs or 4 RGB LEDs

– ?, ?, ?, 1 multiplexing ratio

– Supports direct, TCM, and mix-drive modes

? 4 constant current sinks with high precision:

– 0.1-mA to 51-mA per current sink

– Device-to-device error: max ±5

– Channel-to-channel error: max ±5

– Ultra-low headroom voltage: 110 mV (typ.) at

25.5 mA; 210 mV (typ.) at 51 mA

– PWM phase shift configurable for each LED

? Ultra-low power consumption:

– Shutdown: ISD = 0.1 μA (typical) when EN =

Low

– Standby: ISTB = 26 μA (typical) when EN = High

and CHIP_EN = 0 (data retained)

– Active: INOR = 0.45 mA (typical) when LED

current = 25.5 mA

? Analog dimming (current gain control)

– Global 1-bit Maximum Current (MC): 25.5 mA

or 51 mA

– Individual 8-bit Dot Current (DC) setting

? PWM dimming up to audible-noise-free 24 kHz

– Individual 8-bit PWM dimming resolution

– Linear or exponential dimming curves

? Autonomous animation engine control

? Individual LED dot open/short detection

? Integrated de-ghosting function

? 1-MHz (max.) I2C interface

? –40°C to 85°C operating temperature range

2 Applications

LED animation and indication for:

? Portable and wearable electronics - earbud and

charging case, E-cigarette, smart watch

? Gaming and home entertainment - smart speaker,

RGB mouse, VR headset and controller

? Internet-of-Things (IOT) - E-tag, video doorbell

? Networkings - router, access point

? Industrial HMI - EV charger, factory automation

3 Description

The LP5813 is a synchronous boost 4 × 3 matrix RGB

LED driver with autonomous animation engine control.

The device is ideal to support battery-powered

applications with 0.5-V to 5.5-V input voltage range,

and it has ultra-low normal operation current with 0.4-

mA (typical) when illuminate LEDs.

The integrated synchronous boost converter

maintains excellent efficiency and keeps the

brightness of LEDs stable over a wide operating

voltage range. Output voltage can be selected for

different LED forward voltage from 3 V to 5.5 V with

0.1-V step. The boost converter can power not only

the LEDs driven by the device itself, but also other

loads in the system. If the boost converter need to be

bypassed, VOUT is used as the power supply input

for the LED driver blocks.

The time-cross-multiplexing (TCM) structure is

adopted, which uses 4 output pins to control 12 LED

dots individually. Both high-side scan switch and lowside

current sink are contained in one output. The

total solution size are minimized for space limited

system.

The autonomous animation engine can significantly

reduce the real-time loading of controller. Each LED

can be configured through the related registers to

realize vivid and fancy lighting effects. The device

can generate 6-MHz clock signal and use it for

synchronizing the lighting effects among multiple

devices.