LM3532 datasheet(34/52 Pages) TI2

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VOUT up to 40V

VIN

OVP

ILED1

ILED2

ILED3

PGND

ALS2

ALS1

INT

Ambient Light

Sensor 1

Ambient Light

Sensor 2

VALS

VIN

HWEN

SDA

SCL

LM3532

COUT

CIN

PWM1

PWM2

LM3532

SNVS653E – JULY 2011 – REVISED AUGUST 2015

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8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The LM3532 incorporates a 40-V (maximum output) boost, three high-voltage, low-side current sinks, and

programmable dual ambient light sensor inputs with internal-sensor gain selection. The device can drive up to 3

parallel high-voltage LED strings with up to 90% efficiency. The adaptive current regulation method allows for

different LED currents in each current sink, thus allowing for a wide variety of backlight-with-keypad applications.

8.2 Typical Application

Figure 23. LM3532 Typical Application

8.2.1 Design Requirements

For typical white LED applications, use the parameters listed in Table 20:

Table 20. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Input voltage range

2.7 V to 5.5 V

Output current

500 MHz typical

Boost switching frequency

2 MHz

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