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PDF EL7566 Data sheet ( Hoja de datos )
| Número de pieza | EL7566 | |
| Descripción | Monolithic 6 Amp DC-DC Step-Down Regulator | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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®
Data Sheet
December 1, 2004
EL7566
FN7102.5
Monolithic 6 Amp DC-DC Step-Down
Regulator
The EL7566 is a full-feature synchronous step-down regulator
capable of up to 6A and 96% efficiency. The device operates
from 3V to 6V input supply (VIN). With internal CMOS power
FETs, the device can operate at up to 100% duty ratio,
allowing for an output voltage range of 0.8V to nearly VIN. An
adjustable switching frequency up to 1MHz enables the use of
small components, thereby reducing board area consumption
to under 0.72sq-in on one side of a PCB. The EL7566
operates in constant frequency PWM mode, making external
synchronization possible. A soft-start feature is integrated in
the EL7566 to limit in-rush currents and allow for a smooth
voltage ramp from zero to regulation. Other start-up features
are integrated to add flexibility for synchronizing many
supplies in multiple configurations. The EL7566 also offers a
voltage margining capability that shifts the output voltage ±5%
for validation of system card performance and reliability during
manufacturing tests. A junction temperature indicator
conveniently monitors the silicon die temperature, saving time
in thermal characterization.
An easy-to-use simulation tool is available for download and
can be used to modify design parameters such as switching
frequency, voltage ripple, ambient temperature, as well as
view schematics waveforms, efficiency graphs, and
complete BOM with Gerber layout.
Ordering Information
PART
NUMBER
PACKAGE
TAPE & PKG.
REEL DWG. #
EL7566DRE
28-HTSSOP
- MDP0048
EL7566DRE-T7
28-HTSSOP
7” MDP0048
EL7566DRE-T13
28-HTSSOP
13” MDP0048
EL7566DREZ (Note) 28-HTSSOP (Pb-free) - MDP0048
EL7566DREZ-T7 (Note) 28-HTSSOP (Pb-free) 7” MDP0048
EL7566DREZ-T13 (Note) 28-HTSSOP (Pb-free) 13” MDP0048
EL7566AIREZ (Note) 28-HTSSOP (Pb-free)
-40°C to 85°C
MDP0048
EL7566AIREZ-T7 (Note) 28-HTSSP (Pb-free)
-40°C to 85°C
7” MDP0048
EL7566AIREZ-T13
(Note)
28-HTSSOP (Pb-free) 13” MDP0048
-40°C to 85°C
NOTE: Intersil Pb-free 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-020C.
Features
• Integrated MOSFETs
• 6A continuous output current
• Up to 96% efficiency
• Multiple supply start-up tracking
• Built-in ±5% voltage margining
• 3V to 6V input voltage
• 0.72 in2 footprint with components on one side of PCB
• Adjustable switching frequency to 1MHz
• Oscillator synchronization possible
• 100% duty ratio
• Junction temperature indicator
• Over-temperature protection
• Internal soft-start
• Variable output voltage down to 0.8V
• Power-good indicator
• 28-pin HTSSOP package
• Pb-Free Available (RoHS Compliant)
Applications
• Point-of-regulation power supplies
• FPGA Core and I/O supplies
• DSP, CPU Core, and IO supplies
• Logic/Bus supplies
• Portable equipment
Related Documentation
• Technical Brief 415 - Using the EL7566 Demo Board
• Easy-to-use applications software simulation tool available
at www.intersil.com/dc-dc
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2004. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
1 page  
Block Diagram
EL7566
TM
SEL
0.047µF
390pF
VREF
COSC
VTJ
2.2nF
JUNCTION
TEMPERATURE
VDD
VOLTAGE
REFERENCE
OSCILLATOR
VDD
EN
STP
STN
POWER
TRACKING
PWM
CONTROLLER
COMP
RC
CC
EA
CURRENT
SENSE
SGND
VREF -
+
FB R1 VO
R2
20Ω
VIN
0.22µF
DRIVERS
POWER
FET
POWER
FET
2.7µH
100µF
PGND
150µF
VDD
PG
VIN
VOUT
(2.5V, 6A)
5 FN7102.5
December 1, 2004
5 Page 
EL7566
The VTJ pin reports a voltage proportional to the junction
temperature. Equation 3 illustrates the relationship and can
be used to accurately evaluate thermal design points.
TJ
=
75 + -1---.--2----–-----V----T----J-
0.00384
Full Start-Up Control
The EL7566 offers full start-up control. The core of this
control is a start-up comparator in front of the main PWM
controller. The STP and STN are the inputs to the
comparator, whose HI output forces the PWM comparator to
skip switching cycles. The user can choose any of the
following control configurations:
ADJUSTABLE SOFT-START
In this configuration, the ramp-up time is adjustable to any
time longer than the building soft-start time of 2ms. The
approximate ramp-up time, TST, is:
TST
=
R
C
V-V----I-O-N--
- STN
C 0.1µF
VO
+ STP
R
200K
VO
EL7566
VIN TST
FIGURE 21. ADJUSTABLE START-UP
CASCADE START-UP
In this configuration, EN pin of Regulator 2 is connected to
the PG pin of Regulator 1 (Figure 22). VO2 will only start
after VO1 is good.
LINEAR START-UP
In the linear start-up tracking configuration, the regulator with
lower output voltage, VO2, tracks the one with higher output
voltage, VO1.
C
- - STN
VO2
+
VO1
+ STP
R
EL7566
VIN
EL7566
VIN
VO1
VO2
FIGURE 23. LINEAR START-UP TRACKING
OFFSET START-UP
Compared with the cascade start-up, this configuration
allows Regulator 2 to begin the start-up process when VO1
reaches a particular value of VREF*(1+RB/RA) before PG
goes HI, where VREF is the regulator reference voltage.
VREF=1.26.
VO2
VREF
-
+
EL7566
RB
RA
VO1
VIN
VREF(1+RB/RA)
VO1
VO2
EL7566
VIN
EN PG
VO2
VO1
VIN
EL7566
EL7566
VO1
VO2
FIGURE 22. CASCADE START-UP
11
FIGURE 24. OFFSET START-UP TRACKING
Component Selection
INPUT CAPACITOR
The main functions of the input capacitor(s) are to maintain
the input voltage steady and to filter out the pulse current
passing through the upper switch. The root-mean-square
value of this current is:
I I N ,RMS
=
-----V----O------×----(---V----I--N-----–-----V----O-----)
VIN
×
IO
≈
1/2
(I
O
)
for a wide range of VIN and VO.
For long-term reliability, the input capacitor or combination of
capacitors must have the current rating higher than IIN,RMS.
Use X5R or X7R type ceramic capacitors, or SPCAP or
POSCAP types of Polymer capacitors for their high current
handling capability.
FN7102.5
December 1, 2004
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet EL7566.PDF ] | |
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