SM5306

© 2017 Silicon Mitus, Inc.

www.siliconmitus.com

August 2018

– Rev. 0.0.0

1 / 1

High-Efficiency Dual-String

with up to 10-WLED White LED Driver

Features

 Drives up to Two Strings of 10 Series LEDs

 11-bit Programmable Dimming Resolution

 Exponential or Linear Brightness Control

 PWM Brightness Control for CABC Operation

 Independent Current Control per String

 Internal Soft-Start Limits Inrush Current

 Wide 2.7 V to 5.5 V Input Voltage Range

 Adaptive Headroom Control

 Selectable Boost Frequency of 500 kHz or 980 kHz with

Optionally Additional Offset

 12-Bump 1.65 mm x 1.43 mm WLCSP Package

 Protections

. Programmable 16 V / 24 V / 32 V / 40 V Overvoltage

Protection

. LED Open / Short Circuit Protection

. Thermal Shutdown

. Current Limit

Applications

 Mobile and Smart Phones LCD Backlight

 Tablets LCD Backlight

 Portable Devices LCD Backlight

Description

The SM5306 is a current mode boost converter which

supplies power and controls current in up to two strings of

10 LEDs per string. Programming is done over an I2C-

compatible interface. The maximum LED current is

adjustable from 5 mA to 28.5 mA. At any given maximum

LED current, the LED brightness is further adjusted with

exponential or linear dimming steps. Additionally, pulsed

width modulation (PWM) brightness control can be

enabled, allowing for LED current adjustment by a logic

level PWM signal.

The boost switching frequency is programmable at 500 kHz

for low switching loss performance or 980 kHz to allow the

use of tiny low-profile inductors. The setting for a 10%

offset of these frequencies is available. Overvoltage

protection is programmable at 16 V, 24 V, 32 V or 40 V to

accommodate a wide variety of LED configurations and

Schottky diode/output capacitor combinations. The

SM5306 is available in a 12-bump, 1.65 mm x 1.43 mm

WLCSP package.

Device Information

Part

Package

Size

SM5306

12 WLCSP

1.65 mm x 1.43 mm

Simplified Block Diagram

Silicon Mitus cannot assume any responsibility for the consequence of use of information furnished nor for any infringement of patents or

other rights of third parties which may result from its use. No Circuit patent licenses are implied. Silicon Mitus reserves the right to change

the circuitry and specifications without notice at any time. This publication supersedes and replaces all information previously supplied. Silicon

Mitus products are not authorized for use as critical components in life support devices or systems without the express written approval of

Silicon Mitus.

© 2017 Silicon Mitus, Inc. - Printed in Korea - All Rights Reserved

Boost

Controller

SW

VLED

Bandgap Voltage/Current

Reference

Protections

LED Open Protection

Over Voltage Protection

Thermal Shutdown

LED Open

Detector

Lowest VILED

Detector

I2C Interface & Control

Brightness

Control

PWM

Sampler

SDA

SCL

SEL

PWM

HWEN

INTN

GND

OVP

ILED1

ILED2

IN

Current Source