EL7581_06 INTERSIL [Intersil Corporation], EL7581_06 Datasheet

EL7581_06

Manufacturer Part Number

EL7581_06

Description

3-Channel DC/DC Converter

Manufacturer

INTERSIL [Intersil Corporation]

Datasheet

1.EL7581_06.pdf (17 pages)

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3-Channel DC/DC Converter

The EL7581 is a 3-channel DC/DC converter IC which is

designed primarily for use in TFT/LCD applications. It

features a PWM boost converter with 2.7V to 14V input

capability and 5V to 17V output, which powers the column

drivers and provides up to 720mA @12V, 570mA @ 15V

from 5V input. A pair of charge pump control circuits provide

regulated outputs of V

and -5V to -40V, respectively, each at up to 60mA.

The EL7581 features adjustable switching frequency,

adjustable soft start, and a separate output V

control to allow selection of supply start-up sequence. An

over-temperature feature is provided to allow the IC to be

automatically protected from excessive power dissipation.

The EL7581 is available in a 20 Ld HTSSOP package and is

specified for operation over the full -40°C to +85°C

temperature range.

Ordering Information

NOTE: Intersil Pb-free plus anneal products employ special Pb-free

material sets; molding compounds/die attach materials and 100%

matte tin plate termination finish, which are RoHS compliant and

compatible with both SnPb and Pb-free soldering operations. Intersil

Pb-free products are MSL classified at Pb-free peak reflow

temperatures that meet or exceed the Pb-free requirements of

IPC/JEDEC J STD-020.

EL7581IRE

EL7581IRE-T7

EL7581IRE-T13

EL7581IREZ

(Note)

EL7581IREZ-T7

(Note)

EL7581IREZ-T13

(Note)

NUMBER

PART

MARKING

7581IRE

7581IREZ

PART

and V

TAPE &

REEL

13”

7”

OFF

Data Sheet

supplies at 8V to 40V

20 Ld HTSSOP MDP0048

20 Ld HTSSOP

(Pb-Free)

20 Ld HTSSOP

(Pb-Free)

20 Ld HTSSOP

(Pb-Free)

PACKAGE

enable

MDP0048

DWG. #

PKG.

1-888-INTERSIL or 1-888-468-3774

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

Features

• TFT/LCD display supply

• 2.7V to 14V V

• 5V < V

• -40V < V

• V

• High frequency, small inductor DC/DC boost circuit

• Over 90% efficient DC/DC boost converter capability

• Adjustable frequency

• Adjustable soft-start

• Adjustable outputs

• Small parts count

• Pb-free plus anneal available (RoHS compliant)

Applications

• TFT-LCD panels

• PDAs

Pinout

- Boost regulator

- V

BOOST

OFF

All other trademarks mentioned are the property of their respective owners.

March 9, 2006

BOOST

charge pump

OFF

= 12V @ 720mA

= 15V @ 570mA

Intersil (and design) is a registered trademark of Intersil Americas Inc.

< 40V

VDDB

DRVN

VDDN

VSSB

< 0V

FBB

FBN

< 17V

supply

*Refer to PCB layout guideline.

(20 LD HTSSOP)

TOP VIEW

THERMAL

EL7581

PAD*

ROSC

ENP

ENBN

VREF

PGND

DRVP

VDDP

FBP

VSSP

EL7581

FN7100.5

Related parts for EL7581_06

EL7581_06 Summary of contents

Page 1

Data Sheet 3-Channel DC/DC Converter The EL7581 is a 3-channel DC/DC converter IC which is designed primarily for use in TFT/LCD applications. It features a PWM boost converter with 2.7V to 14V input capability and 5V to 17V output, ...

Page 2

Absolute Maximum Ratings (T = 25° Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 3

Electrical Specifications V = 3.3V PARAMETER DESCRIPTION NEGATIVE REGULATED CHARGE PUMP (V Most negative V output depends on the magnitude of the V OFF configuration (doubler or tripler) V Supply Input for Negative Charge Pump DDN IQ1(V ) ...

Page 4

Pin Descriptions I = Input Output Supply PIN NUMBER PIN NAME PIN TYPE 1 VSSB FBB 4 VDDB DRVN 9 VDDN 10 FBN 11 VSSP 12 ...

Page 5

Typical Performance Curves 1MHz 200 400 600 I (mA) OUT FIGURE 1. EFFICIENCY 15V ...

Page 6

Typical Performance Curves 15V 12V -2 50 250 450 650 I (mA) OUT FIGURE 7. LOAD REGULATION 12V DDP ...

Page 7

Typical Performance Curves R = 61.9kΩ OSC 970 969 968 967 966 965 964 963 962 3 3.5 4 4.5 V (V) DDB FIGURE 13 5V 13V 100mA ...

Page 8

Typical Performance Curves I = 15mA -6V 3.3µF O OFF OFF 20mV/DIV 2µs/DIV FIGURE 19. V RIPPLE OFF C = 0.033µ 2V/DIV I IN 0.5A/DIV 1ms/DIV FIGURE 21. START-UP VOLTAGE AND CURRENT C ...

Page 9

Typical Performance Curves C = 0.1µF SS 5V/DIV 10V/DIV 2V/DIV 200ms/DIV FIGURE 25. POWER-DOWN, 100K AND 0.1µF DELAY NETWORK ON ENP 11.3V OUT I = 50mA OUT FIGURE 27. LX WAVEFORM - DISCONTINUOUS MODE ...

Page 10

Typical Performance Curves FIGURE 31. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE Block Diagram FBB MAX_DUTY R OSC REFERENCE R 3 GENERATOR 62kΩ V REF V RAMP ENBN 10 EL7581 (Continued) JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 1 0.9 ...

Page 11

Applications Information The EL7581 is high efficiency multiple output power solution designed specifically for thin-film transistor (TFT) liquid crystal display (LCD) applications. The device contains one high current boost converter and two low power charge pumps (V and V ). ...

Page 12

Component Considerations Input Capacitor It is recommended that C is larger than 10µF. IN Theoretically, the input capacitor has ripple current of ∆I Due to high-frequency noise in the circuit, the input current ripple may exceed the theoretical value. Larger ...

Page 13

V DDN 5V to 17V 0.1µF R ONP DRVN C CPN V R OFF ONN C OUT2 V SSN 3.3µ FBN REF (1.32V) Positive Charge Pump Design Considerations A single stage charge pump is shown ...

Page 14

Two-Stage Positive Charge Pump Circuit V DDP R ONP DRNP R ONN V SSP - + 1.265V The maximum V output voltage for N+1 stage charge pump is ≤ × × × max 2 V ...

Page 15

Two-Stage Negative Charge Pump Circuit V DDN R DRVN The maximum V output voltage for N+1 stage charge pump is: OFF ( ) ≥ × × max OFF OUT ...

Page 16

Typical Application Circuit R 2 110K OPEN 1 13K V BOOST (12V@ 10µF OPEN 22µF 500mA 10µF 4.7µF GND V OFF (-6V@ 15mA) ...

Page 17

Package Outline Drawing NOTE: The package drawing shown here may not be the latest version. To check the latest revision, please refer to the Intersil website at http://www.intersil.com/design/packages/index.asp All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality ...

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