EL7556B Synchronous Switcher Datasheet

EL7556B Datasheet, PDF, Equivalent


Part Number

EL7556B

Description

Integrated Adjustable 6 Amp Synchronous Switcher

Manufacture

Intersil Corporation

Total Page 11 Pages
Datasheet
Download EL7556B Datasheet


EL7556B
®
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
EL7556B
Absolute Maximum Ratings (TA = 25°C)
Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C
Supply (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0V
Ambient Operating Temperature . . . . . . . . . . . . . . . .-40°C to +85°C
Output Pins . . . . . . . . . . . . . . . -0.3V below GND, +0.3V above VDD
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 135°C
Peak Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9A
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests
are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
Electrical Specifications VDD = VIN = 5V, COSC = 1nF, CSLOPE = 470pF, TA = 25°C unless otherwise specified.
PARAMETER
DESCRIPTION
CONDITIONS
MIN TYP
GENERAL
IDD
IDDOFF
IVIN
VOUT1
VOUT2
VDD Supply Current
VDD Standby Current
VIN No Load Current
Output Initial Accuracy
Output Initial Accuracy
VOUTLINE
VOUTLOAD
Output line Regulation
Output Load Regulation
OUTEN = 4V, FOSC = 120kHz
OUTEN = 0
OUTEN = 0
VCC2DET = 4V, IL = 3A (See Fig. 1)
VCC2DET = 0V, IL = 3A R3 = 150,
R4 = 100
VDD = 5V, ±10%
0A<ILOAD<6A, Relative to IL = 3A.
Continuous Mode of Operation
3.450
2.450
11
0.1
3
3.500
2.500
-1
-1
RSHORT
II MAX
VOUTTC
TOT
THYS
VPWRGD
Short Circuit Load Resistance
Current Limit
Output Tempco
Over Temperature Threshold
Over Temperature Hysteresis
Power Good Threshold Relative to
Programmed Output Voltage
IL = 6A, Prior to Continuous Application of
RSHORT. OUTEN Connected to OT.
-40°C<TA<85°C
VCC2SEL = 4V, VOUT = 3.50V
±6
100
9
±1
135
40
±10
VDDOFF
Minimum VDD for Shutdown
VDDON
Maximum VDD for Startup
VHYS
Input Hysteresis
MSS
Soft start slope
DMAX
Maximum duty cycle
CONTROLLER - INPUTS
VHYS = VDDON-VDDOFF
3.15
0.5
7
96
IPUP
ICSLOPE
IFB1
VCC2DET, OUTEN Pull Up Current
CSLOPE Charging Current
FB1 Input Pull Up Current
VCC2DET, OUTEN = 0
10 14
23 28.5
2
ROT
VIH
VIL
VOH PWGD
VOL PWGD
Over Temperature Pull Up Resistance
VCC2DET, OUTEN Input High
VCC2DET, OUTEN Input Low
Powergood Drive High
Powergood Drive Low
OT = 0V
ILOAD = 1mA
ILOAD = -1mA
30 40
4
3.5
MAX
25
5
3.550
2.550
1
1
±14
4.15
18
34
50
0.8
1.0
UNIT
mA
mA
mA
V
V
%
%
m
A
%
°C
°C
%
V
V
V
V/mS
%
µA
µA
µA
k
V
V
V
V
2


Features ® F T RM A NF O I D ATE Sheet 56D Dat a PD EL75 OR U I EE ON S EL7556B Oct ober 5, 2001 FN7292 Integrated Adjusta ble 6 Amp Synchronous Switcher The EL75 56B is an adjustable synchronous DC:DC switching regulator optimized for a 5V input and 1.0V-3.8V output. By combinin g integrated NMOS power FETs with a fus ed-lead package, the EL7556B can supply up to 6A continuous output current wit hout the use of external power devices or discrete heat sinks, thereby minimiz ing design effort and overall system co st. On-chip resistorless current sensin g is used to achieve stable, highly eff icient, current-mode control. The EL755 6B also incorporates the VCC2DET functi on to directly interface with the Intel P54 and P55 microprocessors. Depending on the state of VCC2DET, the output vo ltage is internally preset to 3.5V or a user-adjustable voltage using two exte rnal resistors. In both internal and ex ternal feedback modes the active-high P WRGD output indicates when the regulator output is within ±10% o.
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