EL7581_06 Datasheet, PDF (1/17 Pages) Intersil Corporation – 3-Channel DC/DC Converter

®
Data Sheet
March 9, 2006
EL7581
FN7100.5
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_ON and V_OFF supplies at 8V to 40V
and -5V to -40V, respectively, each at up to 60mA.
The EL7581 features adjustable switching frequency,
adjustable soft start, and a separate output V_ON enable
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
PART
NUMBER
PART TAPE &
MARKING REEL PACKAGE
PKG.
DWG. #
EL7581IRE
7581IRE
- 20 Ld HTSSOP MDP0048
EL7581IRE-T7 7581IRE
7” 20 Ld HTSSOP MDP0048
EL7581IRE-T13 7581IRE
13” 20 Ld HTSSOP MDP0048
EL7581IREZ
(Note)
7581IREZ
- 20 Ld HTSSOP MDP0048
(Pb-Free)
EL7581IREZ-T7 7581IREZ
(Note)
7” 20 Ld HTSSOP MDP0048
(Pb-Free)
EL7581IREZ-T13 7581IREZ
(Note)
13” 20 Ld HTSSOP MDP0048
(Pb-Free)
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.
Features
• TFT/LCD display supply
- Boost regulator
- V_ON charge pump
- V_OFF charge pump
• 2.7V to 14V V_IN supply
• 5V < V_BOOST < 17V
• 5V < V_ON < 40V
• -40V < V_OFF < 0V
• V_BOOST = 12V @ 720mA
• V_BOOST = 15V @ 570mA
• 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
EL7581
(20 LD HTSSOP)
TOP VIEW
VSSB 1
20 ROSC
SS 2
19 ENP
FBB 3
18 ENBN
VDDB 4
17 VREF
LX 5
LX 6
THERMAL
PAD*
16 PGND
15 PGND
LX 7
14 DRVP
DRVN 8
13 VDDP
VDDN 9
12 FBP
FBN 10
11 VSSP
*Refer to PCB layout guideline.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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