LTC3524EUF#PBF Linear Technology, LTC3524EUF#PBF Datasheet

LTC3524EUF#PBF

Manufacturer Part Number

LTC3524EUF#PBF

Description

IC TFT BIAS SUPPLY ADJ 24-QFN

Manufacturer

Linear Technology

Datasheet

1.LTC3524EUFPBF.pdf (16 pages)

Specifications of LTC3524EUF#PBF

Applications

LCD Display

Voltage - Supply

2.5 V ~ 6 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

24-QFN

Operating Supply Voltage (typ)

3.3/5V

Number Of Segments

Operating Temperature (min)

-40C

Operating Temperature (max)

85C

Operating Temperature Classification

Industrial

Package Type

QFN EP

Pin Count

Mounting

Surface Mount

Operating Supply Voltage (min)

2.5V

Operating Supply Voltage (max)

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current - Supply

Lead Free Status / Rohs Status

Compliant

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Part Number:

LTC3524EUF#PBFLTC3524EUF

Manufacturer:

Quantity:

10 000

Company:

Part Number:

LTC3524EUF#PBF

Manufacturer:

Quantity:

3 500

Current page: 1 of 16
Download datasheet (274Kb)

FEATURES

APPLICATIONS

■

TYPICAL APPLICATION

+12.5V

25mA

2mA

+5V

Generates Three Adjustable, Low Noise Rails for

Small/Medium TFT Displays

Drives Up to Ten White LEDs

LED Dimming and Open-Circuit Protection

Controlled Power-Up/Power-Down Sequencing

1.5MHz Fixed Frequency, Low Noise Operation

TFT Supply Efﬁ ciency Up to 90%

LED Supply Efﬁ ciency Up to 78%

Two Independantly Enabled LED Strings

200 to 1 True Color PWM

Tiny External Solution

24-Lead QFN Package (4mm × 4mm × 0.75mm)

PDAs, Palmtop Computers

Digital Still and Video Cameras

Handheld GPS

Portable Instrument Displays

Portable Media Players

–

Range 2.5V to 6V, V

Li-Ion

10μF

0.47μF

+10V

0.47μF

324k

220k

+5V, –7.5V, +12.5V, 8 LED Power Supply

2.2μF

0.1μF

OUT

SW1

FBVO

VNIN

V2x

FBH

OUT

–

0.1μF

10μH

Range 3V to 6V

Dimming

LTC3524

–

GND

3.3μH

0.1μF

ELED2

ELED1

PROG

VLED

ELCD

LED2

LED1

SW2

FBN

100k for 20mA

470k

10μF

3524 TA01a

0.47μF

DESCRIPTION

The LTC

converter solution for small/medium-sized polysilicon thin

ﬁ lm transistor (TFT) liquid crystal (LCD) display panels.

The device operates from a single Lithium-Ion/polymer

battery or any voltage source between 2.5V and 6V.

A 1.5MHz synchronous boost converter generates a pro-

grammable low noise, high efﬁ ciency 25mA TFT supply

of up to 6.0V. Regulated, low ripple charge pumps are

used to generate up to +20V and –20V at 2mA. Output

sequencing is internally controlled to insure proper

initialization and rapid discharge of the LCD panel in

shutdown.

A second 1.5MHz boost converter powers one or two LED

strings with up to ﬁ ve series elements each. LED current

and display brightness can be controlled over a wide range

using analog or digital means up to 25mA.

The LTC3524 is offered in the 4mm × 4mm 24-pin QFN

package, minimizing the total solution footprint.

True Color PWM is a registered trademarks of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

–7.5V

2mA

OUT

Adjustable TFT Bias Supply

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

3524 is an integrated BIAS and white LED power

100

LCD Bias and LED Efﬁ ciency

with WLED Driver

= 3.6V

OUT

= 3.6V, V

OR LED STRING CURRENT (mA)

OUT

LCD

LED

= 5V, 8 LEDs

LTC3524

3524 TA01b

3524f

Related parts for LTC3524EUF#PBF

LTC3524EUF#PBF Summary of contents

Page 1

... The LTC3524 is offered in the 4mm × 4mm 24-pin QFN package, minimizing the total solution footprint. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. True Color PWM is a registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 3.3μH 10μ ...

Page 2

... VN .............................................................. –21 to +0.3V Operating Temperature Range (Note 2) ...–40°C to 85°C Storage Temperature Range ...................–65°C to 125°C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LTC3524EUF#PBF LTC3524EUF#TRPBF LEAD BASED FINISH TAPE AND REEL LTC3524EUF LTC3524EUF#TR Consult LTC Marketing for parts speciﬁ ed with wider operating temperature ranges. ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise speciﬁ cations are T PARAMETER Switch Current Limit Charge Pumps V2x Output Voltage Output Impedance V2x V2x Maximum Operating Voltage VH Output Voltage (Quadrupler) Output Impedance (2X + Quadrupler) FBH Regulation Voltage VH Maximum Operating ...

Page 4

LTC3524 TYPICAL PERFORMANCE CHARACTERISTICS LCD Boost Efﬁ ciency vs Load Current 100 L = 10μ OUT ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS LCD Bias Sequencing VH V2X 5V/DIV V OUT VN 3524 G11 5ms/DIV SW1 Voltage and 10μH Inductor Current at 5mA Load SW1 2V/DIV I BOOST LCD INDUCTOR CURRENT 50mA/DIV 3524 G14 200ns/DIV LED Burst Dimming Waveforms LED1 ...

Page 6

LTC3524 PIN FUNCTIONS V (Pin 2): Common Input Supply for LCD Bias and White IN LED Boost Converters. This pin must be locally bypassed with a minimum of 2.2μF. GND/Exposed Pad (Pin 25): Signal and Power Ground for the LTC3524. ...

Page 7

LCD BIAS PIN FUNCTIONS FBN (Pin 13): Feedback Pin for the VN Charge-Pump Output. Reference voltage is 1.0V. Connect the resistive divider tap between V and VN here with minimum OUT trace area − − ...

Page 8

LTC3524 BLOCK DIAGRAM + OUT SHDN 324k FBVO 1.225V – V2x +10V 8 SHDN REGULATED CHARGE – CH PUMP 17 QUADRUPLER VH +12.5V 15 OUT ...

Page 9

OPERATION The LTC3524 is a highly integrated power converter intended for small to medium-sized TFT LCD display modules. The part generates the required bias voltages for the LCD panel as well as regulated current for one or two white LED ...

Page 10

LTC3524 OPERATION The doubler is internally connected voltage of approximately 2X V OUT has its input connected to V2x and output to VH. The regu- lated VH voltage is programmed at FBH and can be set to ...

Page 11

OPERATION output voltage is not set to a ﬁ xed voltage, but rather controlled to produce the programmed current in the LED strings. The output (VLED) is rated for a maximum of 21V which will support two strings of up ...

Page 12

LTC3524 APPLICATIONS INFORMATION Inductor Selection 3.3μH to 15μH inductors are recommended for use with the LTC3524’s two boost converters. The synchronous LCD bias boost inductor should have a saturation current (I ) rating of at least 150mA, where the nonsynchronous ...

Page 13

APPLICATIONS INFORMATION and VH should be at least 0.47μF. Please be certain that the capacitors used are rated for the maximum voltage with adequate safety margin. Refer to Table 2 for a listing of capacitor vendors. Table 2. Capacitor Vendor ...

Page 14

LTC3524 TYPICAL APPLICATIONS Li-Ion to +5V, 25mA, +16V, 1mA, –13V, 1mA TFT LCD Power Supply + 10 White LEDs + Li-Ion – +5V, 25mA 10μF 324k +10V 0.47μF +16V, 1mA 0.47μF 165k 14 2.2μF 10μH 4.7μH SW1 V SW2 IN ...

Page 15

... ON THE TOP AND BOTTOM OF PACKAGE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. UF Package 24-Lead Plastic QFN (4mm × ...

Page 16

... Constant-Current, 2.3MHz, Dual High Efﬁ ciency White LED Boost Regulator with Integrated Schottky Diode for 12 LEDs LT3591 Constant-Current, 1MHz, High Efﬁ ciency White LED Boost Regulator with Integrated Schottky Diode ThinSOT is a trademark of Linear Technology Corporation. Linear Technology Corporation 16 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● ...

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