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EL7556D Schematic ( PDF Datasheet ) - Intersil Corporation

Teilenummer EL7556D
Beschreibung Integrated Adjustable 6 Amp Synchronous Switcher
Hersteller Intersil Corporation
Logo Intersil Corporation Logo 




Gesamt 11 Seiten
EL7556D Datasheet, Funktion
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August 1, 2005
EL7556D
FN7339.1
Integrated Adjustable 6 Amp
Synchronous Switcher
The EL7556D is an adjustable synchronous DC:DC
switching regulator optimized for a 5V input and 1.0V-3.8V
output. By combining integrated NMOS power FETS with a
fused-lead package, the EL7556D can supply up to 6A
continuous output current without the use of external power
devices or discrete heat sinks, thereby minimizing design
effort and overall system cost.
On-chip resistorless current sensing is used to achieve
stable, highly efficient, current-mode control. The EL7556D
also incorporates the VCC2DET function to directly interface
with the Intel P54 and P55 microprocessors. Depending on
the state of VCC2DET, the output voltage is internally preset
to 3.5V or a user-adjustable voltage using two external
resistors. In both internal and external feedback modes the
active-high PWRGD output indicates when the regulator
output is within ±10% of the programmed voltage. An on-
board sensor monitors die temperature (OT) for over-
temperature conditions and can be connected directly to
OUTEN to provide automatic thermal shutdown. Adjustable
oscillator frequency and slope compensation allow added
www.DataSheet4U.cofmlexibility in overall system design.
The EL7556D is available in a 28-pin SO package and is
specified for operation over the full -40°C to +85°C
temperature range.
Ordering Information
PART
NUMBER
PACKAGE
TAPE &
REEL PKG. DWG. #
EL7556DCM
28-Pin SO
- MDP0027
EL7556DCM-T13
28-Pin SO
13” MDP0027
EL7556DCMZ
(See Note)
28-Pin SO
(Pb-free)
- MDP0027
EL7556DCMZ-T13
(See Note)
28-Pin SO
(Pb-free)
13” MDP0027
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
• Improved temperature and voltage ranges
• 6A continuous load current
• Precision internal 1% reference
• 1.0V to 3.8V output voltage
• Internal power MOSFETs
• >90% efficiency
• Synchronous switching
• Adjustable slope compensation
• Over-temperature indicator
• Pulse-by-pulse current limiting
• Operates up to 1MHz
• 1.5% typical output accuracy
• Adjustable oscillator with sync
• Remote enable/disable
• Intel P54- and P55-compatible
• VCC2DET interface
• Internal soft-start
• Pb-free plus anneal available (RoHS compliant)
Applications
• PC motherboards
• Local high power CPU supplies
• 5V to 1.0V DC:DC conversion
• Portable electronics/instruments
• P54 and P55 regulators
• GTL+ Bus power supply
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. 2003, 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.






EL7556D Datasheet, Funktion
Typical Performance Curves
EL7556D
VOUT vs CSLOPE
(VIN=5.0V, ILOAD=0.5A)
1.5
1.0 TA=25°C
0.5
0.0 VOUT=1V
-0.5
VOUT=2.5V
-1.0 VOUT=3.5V
-1.5
-2.0
-2.5
-3.0
50
75 100 125 150
CSLOPE (pF)
175
FOSC vs COSC
10k
1k
TA=25°C
100
10
1
10 100 1k 100k
COSC (pF)
I(VDD) + I(VIN) vs FOSC
60
TA=25°C
50 OUTEN=VDD
VDD=5.5V
40
30
VDD=4.5V
VDD=5V
20
10
Discontinuous Mode
0
200 400 600
Continuous Mode
800 1000
FOSC (kHz)
I(VDD) vs FOSC
50
45
TA=25°C
OUTEN=VDD
40
35
30
25
20
15
10
5
0
200 400
VDD=5.5V
VDD=4.5V
600
FOSC (kHz)
VDD=5V
800 1000
VOUT Variation vs Programmed Output
Voltage [VIDEAL=(1+R3/R4)]
1.5
TA=25°C
1.0
C
0.5
0.0
COSSLCO=P2E20=p1F00pF
-0.5
-1.0
Loop Gain Induced Error
-1.5
1.0 1.5 2.0 2.5 3.0 3.5 4.0
VIDEAL (V)
FOSC vs Temperature
520
510
VDD=4.5V
500
490 VDD=5.5V
480
470 VDD=5V
460
450
0
20 40 60 80 100 120 140
Temperature (°C)
I(VIN) vs FOSC
16
TA=25°C
14 OUTEN=VDD
12
VDD=5.5V
10
8 VDD=5V
6
VDD=4.5V
4
2
Discontinuous Mode
0
200 400 600
Continuous Mode
800 1000
FOSC (kHz)
IDD + IVIN vs FOSC
2.0
VDD=5.5V
1.5 VDD=5V
VDD=4.5V
1.0
10
100
FOSC (kHz)
1000
6

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