EL7581 Datasheet, PDF (1/17 Pages) Intersil Corporation – 3-Channel DC-DC Converter

®
Data Sheet
April 16, 2004
EL7581
FN7100.4
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-pin HTSSOP package and
is specified for operation over the full -40°C to +85°C
temperature range.
Ordering Information
PART
NUMBER
EL7581IRE
EL7581IRE-T7
EL7581IRE-T13
EL7581IREZ
(Note)
PACKAGE
20-Pin HTSSOP
20-Pin HTSSOP
20-Pin HTSSOP
20-Pin HTSSOP
(Pb-Free)
TAPE &
REEL PKG. DWG. #
-
MDP0048
7”
MDP0048
13”
MDP0048
-
MDP0048
EL7581IREZ-T7 20-Pin HTSSOP
7”
(Note)
(Pb-Free)
MDP0048
EL7581IREZ-T13 20-Pin HTSSOP
13”
(Note)
(Pb-Free)
MDP0048
NOTE: Intersil Pb-Free products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which is 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-020B.
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
Applications
• TFT-LCD panels
• PDAs
Pinout
EL7581
(20-PIN 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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