EL7558B Datasheet, PDF (1/11 Pages) Intersil Corporation – Integrated Adjustable 8 Amp Synchronous Switcher

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April 27, 2001
EL7558B
FN7293
Integrated Adjustable 8 Amp
Synchronous Switcher
The EL7558B 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 HSOP package the EL7558B can supply up to
8A continuous output current without the use of external
power devices or externally attached 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 EL7558B
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 3.50V 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
flexibility in overall system design.
The EL7558B is available in the 28-pin HSOP package and
is specified for operation over the -40°C to +85°C
temperature range.
Pinout
EL7558B
(28-PIN HSOP)
TOP VIEW
R4
100Ω
R3
150Ω
V_IN
V_IN
C4 0.1µF
C7 220pF
C8 330pF
R5
5.1Ω
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
D3
C5
D2
R1
1µF
20Ω
R6
D1
C 6 39.2Ω
0.1µF
L1 2.5µH
C10
1mF
D4*
(Optional)
C11
0.22µF
V_OUT
Connect to VSSP for
external feedback
12 VSSP TEST 17
13
VCC2DET
PWRGD
16
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 EL7558ACM only
14 OUTEN
OT 15
Manufactured under U.S. Patents No. 5,723,974 and No. 5,793,126
Features
• EL7558/EL7558A pin-compatible
• Improved temperature and voltage ranges
• 8A 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
EL7558BCM
EL7558BCM-T13
PACKAGE
28-Pin HSOP
28-Pin HSOP
TAPE &
REEL
-
13”
PKG. NO.
MDP0042
MDP0042
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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