EL7556BCM-T13 INTERSIL [Intersil Corporation], EL7556BCM-T13 Datasheet

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EL7556BCM-T13

Manufacturer Part Number
EL7556BCM-T13
Description
Integrated Adjustable 6 Amp Synchronous Switcher
Manufacturer
INTERSIL [Intersil Corporation]
Datasheet
1.EL7556BCM-T13.pdf (11 pages)
Integrated Adjustable 6 Amp
Synchronous Switcher
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
oscillator 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
Manufactured under U.S. Patents No. 5,723,974 and No. 5,793,126
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
V
IN
660µF
C9
5.1Ω
R5
C4
1µF
C3
0.1µF
Connect to VSSP for
external feedback
C7
100Ω
R4
C12
1µF
39pF
C8
220pF
The EL7556B is an adjustable
synchronous DC:DC switching
regulator optimized for a 5V input and
10
11
12
13
14
1
2
3
4
5
6
7
8
9
(28-PIN SO)
TOP VIEW
CREF
COSC
VDD
VIN
VSSP
VIN
VSSP
VSSP
VSSP
VSSP
VCC2DET
OUTEN
FB1
CSLOPE
EL7556B
®
150Ω
R3
PWRGD
VSSP
VSSP
TEST
C2V
VSS
1
FB2
VHI
OT
CP
LX
LX
LX
LX
28
27
26
25
24
23
22
21
20
19
18
17
16
15
20Ω
R1
Data Sheet
0.1µF
L1
C 6
2.5µH
39.2Ω
1µF
C 5
R6
Copyright © Intersil Americas Inc. 2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.
1mF
D1
C10
D3
D2
V
IN
0.22µF
C11
(Optional)
D4*
1-888-INTERSIL or 321-724-7143
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
V
1V*(1+R3/R4)
OUT =
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
EL7556BCM
EL7556BCM-T13
PART NUMBER
October 5, 2001
All other trademarks mentioned are the property of their respective owners.
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
PACKAGE
28-Pin SO
28-Pin SO
TAPE &
REEL
13”
-
EL7556B
PKG. NO.
MDP0027
MDP0027
FN7292

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EL7556BCM-T13 Summary of contents

Page 1

... V OUT = 1V*(1+R3/R4) PART NUMBER C10 1mF EL7556BCM EL7556BCM-T13 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 Copyright © Intersil Americas Inc. 2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc. EL7556B TAPE & PACKAGE REEL ...

Page 2

Absolute Maximum Ratings (T = 25°C) A Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C Supply ( ...

Page 3

Electrical Specifications PARAMETER DESCRIPTION CONTROLLER - REFERENCE V Reference Accuracy REF V Reference Voltage Tempco REFTC V Reference Load Regulation REFLOAD CONTROLLER - DOUBLER VC2V Voltage Doubler Output CONTROLLER - OSCILLATOR F Oscillator Ramp Amplitude RAMP ...

Page 4

Typical Performance Curves Efficiency =3.5V) LOAD OUT V =V =5.0V (±10 = =5. 0.5 1.5 2.5 3.5 I OUT Line Regulation (C ...

Page 5

Typical Performance Curves Line Regulation vs C SLOPE V =V =5.0V ±10 0.8 0.7 0.6 0.5 I =6A OUT 0.4 0.3 0.2 I =0.5A OUT 0.1 0 100 C SLOPE OUT SLOPE (V ...

Page 6

Typical Performance Curves I I OSC 60 T =25°C A OUTEN =5. =4. Discontinuous Mode 0 200 400 600 F (kHz) OSC I(V ...

Page 7

Typical Performance Curves Θ Area Board with 0.00 1.00 2.00 3.00 Bare Cu Area ( Temperature DSON ...

Page 8

Pin Descriptions I = INPUT OUTPUT SUPPLY PIN PIN NUMBER PIN NAME TYPE 1 FB1 I Voltage feedback pin for the buck regulator. Active when VCC2DET is logic low. Normally connected to external resistor divider between ...

Page 9

Block Diagram FB1, Pin1 2-1 MUX FB2, Pin 28 VCCDET, Pin 13 CSLOPE, Pin 3 CREF, Pin 27 1.26V OUTEN, Pin 14 4V UVLO VDD - S + COSC, Pin Applications Information Circuit Description General The ...

Page 10

This feed-forward characteristic also simplifies AC loop compensation since it adds a zero to the overall loop response. Through proper selection of the current- feedback to voltage-feedback ratio, ...

Page 11

Operating frequency can be adjusted through the C or can be driven by an external clock source. If the oscillator is driven by an external source, care must be taken in the selection Since the C SLOPE ...

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