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PDF EL7554 Data sheet ( Hoja de datos )
| Número de pieza | EL7554 | |
| Descripción | Monolithic 4 Amp DC-DC Step-Down Regulator | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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®
Data Sheet
May 8, 2006
EL7554
FN7360.4
Monolithic 4 Amp DC-DC Step-Down
Regulator
The EL7554 is a full-feature synchronous 4A step-down
regulator capable of up to 96% efficiency. This device
operates from 3V to 6V VIN input supply. With internal
CMOS power FETs, the device can operate at up to 100%
duty ratio, allowing for output voltage range from 0.8V up to
nearly VIN.The adjustable high switching frequency of up to
1MHz enables the use of small components, making the
whole converter occupy less than 0.58 square inch with
components on one side of the PCB. The EL7554 operates
at constant frequency PWM mode, making external
synchronization possible. The EL7554 features soft-start
and full start-up control, which eliminates the in-rush current
and enables users to control the start-up of multiple
converters to any configuration with ease. The EL7554 also
offers a ±5% voltage margining capability that allows raising
and lowering of the supplies derived from the EL7554 to
validate the performance and reliability of system cards
quickly and easily during manufacturing testing. A junction
temperature indicator conveniently monitors the silicon die
temperature, saving designers time in the tedious thermal
characterization.
www.DataSheet4U.com
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.
The EL7554 is available in a 28 Ld HTSSOP package and is
specified for operation over the -40°C to +85°C temperature
range.
Ordering Information
PART
NUMBER
PART TAPE &
PKG.
MARKING REEL PACKAGE DWG. #
EL7554IRE
7554IRE
- 28 Ld HTSSOP MDP0048
EL7554IRE-T7 7554IRE
7” 28 Ld HTSSOP MDP0048
EL7554IRE-T13 7554IRE
13” 28 Ld HTSSOP MDP0048
EL7554IREZ
(See Note)
7554IREZ
- 28 Ld HTSSOP MDP0048
(Pb-free)
EL7554IREZ-T7 7554IREZ
(See Note)
7” 28 Ld HTSSOP MDP0048
(Pb-free)
EL7554IREZ-T13 7554IREZ
(See Note)
13” 28 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
• Integrated MOSFETs
• 4A continuous output current
• Up to 96% efficiency
• All ceramic capacitors
• Multiple supply start-up tracking
• Built-in ±5% voltage margining
• 3V to 6V input voltage
• 0.58 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 Ld HTSSOP package
• Pb-free plus anneal 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 418 - Using the EL7554 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 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2004-2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
EL7554
Block Diagram
TM
SEL
0.018µF
220pF
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 R2 VO
R1
20Ω
VIN
0.22µF
DRIVERS
POWER
FET
POWER
FET
2.2µH
2x10µF
PGND
47µF
VDD
PG
VIN
VOUT
(UP TO 4A)
5 FN7360.4
May 8, 2006
5 Page 
EL7554
- STN
C 0.1µF
VO
+ STP
R
200K
VO
EL7554
VIN
TST
FIGURE 21. ADJUSTABLE START-UP
In this application, CIN and COUT may be increased to
reduce input/output ripple because the pulse skipping nature
of the method.
2. 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.
EN PG
VO2
VO1
VIN
EL7554
EL7554
VO1
VO2
FIGURE 22. CASCADE START-UP
3. 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. The waveform is shown in Figure 19.
C
- - STN
VO2
+
VO1
+ STP
R
EL7554
VIN
EL7554
VIN
VO1
VO2
FIGURE 23. LINEAR START-UP TRACKING
4. 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
-
+
EL7554
RB
RA
VO1
VIN
VREF(1+RB/RA)
VO1
VO2
EL7554
VIN
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:
IIN,RMS = -----V----O------×----(-V--V--I--NI--N-----–-----V----O-----) × 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.
INDUCTOR
The NFET positive current limit is set at about 5A. For
optimal operation, the peak-to-peak inductor current ripple
ΔIL should be less than 1A. The following equation gives the
inductance value:
L = -(--VV----I-I-NN------×–----V-Δ---O-I--L--)--×--×---F--V--S--O--
The peak current the inductor sees is:
ILPK = IO + -Δ--2--I--L-
When inductor is chosen, make sure the inductor can handle
this peak current and the average current of IO.
OUTPUT CAPACITOR
If there is no holding time requirement for output; output
voltage ripple and transient response are the main deciding
factors in choosing the output capacitor. Initially, choose the
11 FN7360.4
May 8, 2006
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet EL7554.PDF ] | |
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