SM5350

© 2017 Silicon Mitus, Inc.

www.siliconmitus.com

August 2018

High-Efficiency Three-String

with up to 10-WLED White LED Driver

Features

 Drives up to Three Strings of 10 Series LEDs

 11-bit Programmable Dimming Resolution

 Exponential or Linear Brightness Control

 PWM Brightness Control for CABC Operation

 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 kH or 1 MHz.

 12-Bump WLCSP Package

 Protections

. Programmable 16 V / 24 V / 32 V / 35.5 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 SM5350 is a current mode boost converter which

supplies the power and controls current in up to three

strings of 8 LEDs per string. Programming is done over an

I2C-compatible interface. The maximum LED current is

adjustable from 5 mA to 29.8 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 1 MHz to allow the

use of tiny low-profile inductors. Overvoltage protection is

programmable at 16 V, 24 V, 32 V, or 35.5 V to

accommodate a wide variety of LED configurations and

Schottky diode/output capacitor combinations. The

SM5350 is available in a 12-bump WLCSP package.

Device Information

Part

Package

Size

SM5350

12 WLCSP

1.61 mm x 1.26 mm

Simplified Block Diagram

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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