component

SM16825E

Unreviewed

by Kyle Bergstedt

5-channel RGBWY constant current LED driver — 10-300mA, 16-bit PWM, RZ protocol, 5-40V, ESOP8

Overview Files Versions Dependencies Discussions Activity

Description

The SM16825E is a 5-channel low-voltage linear constant current driver IC from Shenzhen Sunmoon Microelectronics. It uses a single-wire RZ code protocol at 800 Kbps for data input and supports daisy-chain cascading via DIN/DOUT. Each of the 5 output channels (OUTR/OUTG/OUTB/OUTW/OUTY) provides adjustable constant current from 10 to 300 mA with a 5-bit current gain control per channel. The IC features 16-bit PWM dimming (65536 grayscale levels) per channel, built-in over-temperature protection, data shaping without attenuation, and a standby mode consuming less than 2 mW.

Features

  • 5 constant-current output channels (R/G/B/W/Y)
  • Operating voltage: 5-40 V
  • Output current: 10-300 mA per channel (5-bit gain, 10 mA steps)
  • Output current deviation: +/-5% or better
  • Low knee voltage: 0.8 V at 300 mA (VDD = 5V)
  • 16-bit PWM dimming: 65536 grayscale levels
  • PWM frequency: 4.0 kHz typical (3.5-4.5 kHz)
  • Single-wire RZ code protocol at 800 Kbps
  • Daisy-chain cascade (DIN to DOUT)
  • Built-in data shaping (no signal attenuation in cascade)
  • Built-in over-temperature protection
  • Standby mode with auto-wake on DIN data
  • Standby current: < 100 uA
  • Minimum output current turn-on pulse width: 160 ns
  • Packages: ESOP8, EMSOP8

Pin Configuration

Pin Name Description
1 OUTW White LED drive current output
2 OUTY Yellow/warm white LED drive current output
3 VIN Power supply (5-40V)
4 DIN RZ code data input
5 DOUT Cascade data output
6 OUTB Blue LED drive current output
7 OUTG Green LED drive current output
8 OUTR Red LED drive current output
Pad GND Ground (exposed pad)

Absolute Maximum Ratings

Ta = 25 C

Parameter Symbol Range Unit
Power supply voltage VIN 5-40 V
Logic input voltage (DIN) DIN -0.4 to 5.5 V
Output breakdown voltage BVOUT 45 V
Maximum output current IOUT_MAX 300 mA
Thermal resistance (ESOP8) RthJA 65 C/W
Thermal resistance (EMSOP8) RthJA 60 C/W
Power dissipation (ESOP8) PD 1.25 W
Power dissipation (EMSOP8) PD 1.15 W
Operating junction temperature TJ -40 to 150 C
Storage temperature TSTG -55 to 150 C
ESD (HBM) VESD 2 kV

Electrical Characteristics

VIN = 24V, TA = 25 C

Parameter Symbol Min Typ Max Unit
External power supply VIN 5 -- 36 V
Internal power supply VDD 4.5 5.0 5.3 V
Quiescent current (all off) IDD1 -- 0.6 -- mA
Quiescent current (150mA out) IDD2 -- 3.0 -- mA
Standby current ISTB -- -- 100 uA
DIN input high VIH 2.8 -- -- V
DIN input low VIL -- -- 1.5 V
Output current range IOUT 10 -- 300 mA
Output current deviation (chip-to-chip) dIOUT -- +/-5 -- %
Output current deviation (in-chip) dIOUT -- +/-3 -- %
Knee voltage at 150 mA VDS_S -- 0.5 -- V
Knee voltage at 300 mA VDS_S -- 0.8 -- V
PWM dimming frequency fPWM 3.5 4.0 4.5 kHz
Output rise time tTLH -- 100 -- ns
Output fall time tTHL -- 80 -- ns

Software API

RZ Code Protocol Timing

Symbol Description Min Typ Max Unit
T Code element period 1200 -- -- ns
T0H 0 code, HIGH level 200 300 400 ns
T0L 0 code, LOW level 800 900 -- ns
T1H 1 code, HIGH level 800 900 1000 ns
T1L 1 code, LOW level 200 300 -- ns
Trst Reset, LOW level 200 -- -- us

Data Format

Each chip receives 80 bits of data per frame:

  • 5 x 16-bit grayscale values (OUTR, OUTG, OUTB, OUTW, OUTY) = 80 bits
  • Followed by a 32-bit trailer: 5 x 5-bit current gain values + 2-bit standby enable + 5-bit reserved

Current gain values set output current: gain x 10 mA (range 1-30, i.e., 10-300 mA).

Packages

Model Package Tube Tape Reel Size
SM16825E ESOP8 100000 pcs/box 4000 pcs/tape 13 inches
SM16825E EMSOP8 -- 4000 pcs/tape 13 inches

Applications

  • LED lighting (RGBWY multi-color)
  • LED backlight
  • Architectural and decorative lighting
  • LED strip and pixel control

Files

🖼 opt-block.png Image 🖼 opt-protocol.png Image