Datenblatt-pdf.com


EL7556B Schematic ( PDF Datasheet ) - Intersil Corporation

Teilenummer EL7556B
Beschreibung Integrated Adjustable 6 Amp Synchronous Switcher
Hersteller Intersil Corporation
Logo Intersil Corporation Logo 




Gesamt 11 Seiten
EL7556B Datasheet, Funktion
®
FOR
UPDDAaTtEa DESLhIN7eF5e5Ot6RDMATION
SEE
October 5, 2001
EL7556B
FN7292
Integrated Adjustable 6 Amp
Synchronous Switcher
The EL7556B 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 EL7556B 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 EL7556B
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
www.DataSheet4U.coomscillator frequency and slope compensation allow added
flexibility in overall system design.
The EL7556B is available in a 28-pin SO package and is
specified for operation over the full -40°C to +85°C
temperature range.
Pinout
EL7556B
(28-PIN SO)
TOP VIEW
R4
100
R3
150
VIN
D3
VIN
C4 0.1µF
C7 39pF
C8 220pF
R5
5.1
1 FB1
FB2 28
2 CREF
CP 27
3 CSLOPE C2V 26
4 COSC VSS 25
5 VDD
VHI 24
6 VIN
LX 23
7 VSSP
LX 22
C9
660µF
C12
1µF
C3
1µF
8 VIN
LX 21
9 VSSP
LX 20
10 VSSP VSSP 19
11 VSSP VSSP 18
C5
R1 1µF
20
R6
D2 D4*
(Optional)
D1 C11
0.22µF
C 6 39.2
0.1µF
L1 2.5µH
C10
1mF
VOUT =
1V*(1+R3/R4)
Connect to VSSP for
external feedback
C12 - 1µF
C3, C4, C5, C6, C7 C8 - ceramic
C5, C11 - ceramic or tantalum
C9 - Sprague 293D337X96R3 2X330µF
C10 - Sprague 293D337X96R3 3X330µF
L1 - Pulse Engineering, PE-53681
D1-D4: BAT54S fast diode
D4 Required for EL7556ACM Only
12 VSSP TEST 17
13
VCC2DET
PWRGD
16
14 OUTEN
OT 15
Manufactured under U.S. Patents No. 5,723,974 and No. 5,793,126
Features
• EL7556/EL7556A Pin-compatible
• 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
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
Ordering Information
PART NUMBER
EL7556BCM
EL7556BCM-T13
PACKAGE
28-Pin SO
28-Pin SO
TAPE &
REEL
-
13”
PKG. NO.
MDP0027
MDP0027
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. 2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.
All other trademarks mentioned are the property of their respective owners.






EL7556B Datasheet, Funktion
EL7556B
Typical Performance Curves (Continued)
I(VDD) + I(VIN) vs FOSC
60
TA=25°C
50 OUTEN=VDD
VDD=5.5V
40
30 VDD=5V
VDD=4.5V
20
10
Discontinuous Mode
0
200 400 600
FOSC (kHz)
Continuous Mode
800 1000
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
Power On Reset
40
TA=25°C
OUTEN=VDD
30
FOSC=500k
20
10
0
2.5 3.0 3.5 4.0 4.5 5.0
VDD(V)
I(VIN) vs FOSC
16
TA=25°C
14 OUTEN=VDD
12
VDD=5.5V
10
8 VDD=5V
6
4 VDD=4.5V
2
Discontinuous Mode
0
200 400
600
FOSC (kHz)
Continuous Mode
800 1000
IDD + IVIN vs FOSC
2.0
VDD=5.5V
1.5
VDD=5V
VDD=4.5V
1.0
10
100
FOSC (kHz)
1000
Minimum Output Voltage vs FOSC
2.3
2.1 TJ=120°C
1.9
VDD=5.5V
1.7
1.5
1.3 VDD=5V
1.1
VDD=4.5V
0.9
0.7
FOSC (kHz)
6

6 Page







SeitenGesamt 11 Seiten
PDF Download[ EL7556B Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
EL7556ACProgrammable CPU Power Supply UnitElantec Semiconductor
Elantec Semiconductor
EL7556BIntegrated Adjustable 6 Amp Synchronous SwitcherIntersil Corporation
Intersil Corporation
EL7556BCIntegrated Adjustable 6 Amp Synchronous SwitcherElantec Semiconductor
Elantec Semiconductor
EL7556BCMIntegrated Adjustable 6 Amp Synchronous SwitcherElantec Semiconductor
Elantec Semiconductor
EL7556BCM-T13Integrated Adjustable 6 Amp Synchronous SwitcherElantec Semiconductor
Elantec Semiconductor

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche