cxa3757gf Sony Electronics, cxa3757gf Datasheet

cxa3757gf

Manufacturer Part Number

cxa3757gf

Description

Ultrasmall High-efficiency 3ch/4ch Backlight Led Driver For Mobile Equipment Features Built-in Boost-type Dc-dc Converter

Manufacturer

Sony Electronics

Datasheet

1.CXA3757GF.pdf (2 pages)

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There are two reasons for the high efficiency

of Sony LED drivers. The first is that the

LEDs are driven in parallel.

By driving the LEDs in parallel, the state

where the backlight is on is divided into two

periods: the period when the battery voltage

is high and LEDs can be driven directly (the

boost not needed period) and the period when

the battery voltage is low and LEDs cannot be

As the functionality and performance of portable equipment have increased in recent years,

the battery drain has also increased.

At the same time, there are also increasing demands for further smaller sizes and even thinner form factors.

Thus there are now demands for reduced power consumption

and further small size in the backlight LED driver ICs used in this equipment.

The CXA3757GF uses Sony’s unique system to achieve the industry’s highest level of efficiency.

Furthermore, by the adoption of an ultrasmall package,

Sony has achieved a mounting area so small it can be mounted in the LCD panel module.

CXA3757GF

■ High-efficiency LED drive using a

■ Ultrasmall, low-profile package: 1.5 ×

■ Supports small chip inductors

■ Supports low-voltage drive

■ Maximum drive current: 20 mA/

■ Brightness adjustment function

■ F u l l c o m p l e m e n t o f b u i l t - i n

High-Efficiency LED Drive Using

a Unique Sony System

unique Sony system

2.0 × 0.6 mm (maximum)

(Operating voltage: 2.0 to 4.8 V)

channel

based on a PWM input

protection functions (overvoltage

protection, UVLO, and thermal

protection)

Ultrasmall High-Efficiency 3ch/4ch Backlight

LED Driver for Mobile Equipment

Features Built-in Boost-type DC-DC Converter

driven directly (the boost required period).

Since the power supply can be turned off

in the boost not needed period, there is

essentially no power loss (power efficiency:

97%). With lithium-ion batteries, the state

where the battery voltage is 3.6 V or higher

is long, and since this is the boost not

needed period, power loss can be reduced

significantly by connecting the LEDs in

parallel.

The second reason is that the boost required

period is made as short as possible. To achieve

this, Sony has developed LED drivers that

operate at 0.14 V. This means that the boost

not needed period extends until the battery

voltage drops below (0.14 V + VF for the

LEDs).

For these two reasons, the LED can be used

without the boost operation for the majority

of the battery discharge period, and as a

result power consumption waste is completely

eliminated and power loss when the LEDs are

on is held to an absolute minimum.

The CXA3757GF is provided in an ultrasmall,

low-profile package with 1.5 × 2.0 × 0.6 mm

maximum dimensions. To support circuit

Achieves the Industry’s Smallest

Mounting Area Level:

Ultrasmall, Low-Profile Package

Supports the Use of Small Chip Inductors

board miniaturization, not only does the

CXA3757GF feature a small package, it also

features a design that supports miniaturization

of the peripheral components.

Furthermore, to respond to desires for thinner

form factors, it supports the construction of

systems that only use 0.6 mm or shorter low-

profile components.

The CXA3757GF supports a wide supply

voltage input range (2.0 to 4.8 V) to handle

the low-voltage lithium-ion batteries expected

in the future.

Low-Voltage Operation

For anyone worrying about how to save

space or power in portable equipment,

I strongly recommend that you look into

this device.

This IC combines the industry’s highest

levels of efficiency and space savings.

I am sure that it can provide results

that match your hopes. In the future, in

addition to this 3ch/4ch version, we plan

to add a 6 channel version to the product

lineup.

Related parts for cxa3757gf

cxa3757gf Summary of contents

Page 1

... Thus there are now demands for reduced power consumption and further small size in the backlight LED driver ICs used in this equipment. The CXA3757GF uses Sony’s unique system to achieve the industry’s highest level of efficiency. Furthermore, by the adoption of an ultrasmall package, Sony has achieved a mounting area so small it can be mounted in the LCD panel module. ■ ...

Page 2

Figure 1 Block Diagram V CC 4.2 µ 4.7 µF 4.7 µ DC-DC A2 converter C3 0.1 µF Thermal shutdown EN B2 Constant current BGR TEST Current C2 POR Power LEDEN on control ...

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