EL7556AC Supply Unit Datasheet

EL7556AC Datasheet, PDF, Equivalent


Part Number

EL7556AC

Description

Programmable CPU Power Supply Unit

Manufacture

Elantec Semiconductor

Total Page 13 Pages
Datasheet
Download EL7556AC Datasheet


EL7556AC
EL7556AC
Programmable CPU Power Supply Unit
Features
EL7556C 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 w/Sync
Remote Enable/Disable
Intel P54 and P55 Compatible
VCC2DET Interface
www.DataSheet4U.com 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 No Temp. Range
Package
EL7556ACM -40°C to +85°C 28-Lead SOIC
Outline #
MDP0027
General Description
The EL7556AC is an adjustable synchronous DC:DC switching regu-
lator optimized for a 5V input and 1.0-3.8V output. By combining
integrated NMOS power FETS with a fused-lead package the
EL7556AC can supply up to 6A continuous output current without the
use of external power devices or discrete heat sinks, thereby minimiz-
ing design effort and overall system cost.
On chip resistorless current sensing is used to achieve stable, highly
efficient, current-mode control. The EL7556AC 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 moni-
tors 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.
Connection Diagram
VIN
R4
100
R3
150
C4 0.1µF
C7 150pF
C8 220pF
R5
5
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
0.1µF
C3
1µF
8 VIN
LX 21
9 VSSP
LX 20
10 VSSP VSSP 19
11 VSSP VSSP 18
Connect to VSSP for
external feedback
12 VSSP TEST 17
13
VCC2DET
PWRGD
16
14 OUTEN
OT 15
VIN
D3
C5
R1 1µF
68
R6
C 6 68
0.1µF
D2
D1
D4
C11
0.22µF
L1 2.5µH
C10
1mF
VOUT
C3, C4, C5, C6, C7 C8 - ceramic
C5, C11 - ceramic or tantalum
C9 - Sprague 594D337X10010R2T 2X330µF
C10 - Sprague 594D337X10010R2T 3X330µF
L1 - Pulse Engineering, PE-53681
D1-D4: BAT54S fast diode
EL7556AC
Manufactured under U.S. Patents No. 5,723,974 and No. 5,793,126
Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a “controlled document”. Current revisions, if any, to these
specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation.
© 2000 Elantec, Inc.

EL7556AC
EL7556AC
Programmable CPU Power Supply Unit
Absolute Maximum Ratings (TA = 25 °C)
Storage Temperature Range
Supply (V )
IN
Ambient Operating Temperature
-65°C to +150°C
6.0V
-40°C to +85°C
Output Pins
Operating Junction Temperature
Peak Output Current
-0.3V below GND, +0.3V above VDD
135°C
9A
Important Note:
All parameters having Min/Max specifications are guaranteed. Typ 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 Characteristics
VDD = VIN = 5V, COSC = 1nF, CSLOPE=470pF, TA=25°C unless otherwise specified.
Parameter
General
IDD
IDDOFF
IVIN
VOUT1
VOUT2
Description
VDD Supply Current
VDD Standby Current
VIN No Load Current
Output Initial Accuracy
Output Initial Accuracy
VOUTLINE
VOUTLOAD
Output line Regulation
Output Load Regulation
RSHORT
Short Circuit Load Resistance
II MAX
Current Limit
VOUTTC
Output Tempco
TOT Over Temperature Threshold
THYS
VPWRGD
Over Temperature Hysteresis
Power Good Threshold Relative to Programmed
Output Voltage
VDDOFF
Minimum VDD for Shutdown
VDDON
Maximum VDD for Startup
VHYS
Input Hysteresis
M
SS
DMAX
Soft start slope
Maximum duty cycle
Controller - Inputs
IPUP VCC2DET, OUTEN Pull Up Current
ICSLOPE
Cslope Charging Current
IFB1 FB1 Input Pull Up Current
ROT Over Temperature Pull Up Resistance
VIH VCC2DET, OUTEN Input High
VIL VCC2DET, OUTEN Input Low
VOH PWGD Powergood Drive High
VOL PWGD Powergood Drive Low
Controller - Reference
VREF
VREFTC
Reference Accuracy
Reference Voltage Tempco
VREFLOAD Reference Load Regulation
Conditions
OUTEN=4V, FOSC=120kHz
OUTEN=0
OUTEN=0
VCC2DET=4V, IL=3A(See Fig. 1)
VCC2DET=0V, IL=3A R3=150, R4=100
(See Fig. 1)
VDD=5V, ±10%
0A<ILOAD<6A, Relative to IL=3A. Continu-
ous Mode of Operation (Fig.1)
IL=6A Prior to Continuous Application of
RSHORT. OUTEN Connected to OT.
-40°C<Ta<85°C
VCC2SEL=4V, VOUT=3.50V
VHYS=VDDON-VDDOFF
VCC2DET, OUTEN=0
OT=0V
ILoad=1mA
ILoad=-1mA
IREF=0
0<ILOAD<100µ A
Min
3.450
2.450
-1
-1
±6
3.15
10
23
30
4
3.5
1.247
0.5
Typ
11
0.1
3
3.500
2.500
100
9
±1
135
40
±10
0.5
7
96
14
28.5
2
40
1.260
50
Max Units
25
5
3.550
2.550
mA
mA
mA
V
V
1%
1%
m
A
%
°C
°C
±14 %
V
4.15 V
V
V/msec
%
18 µA
34 µA
µA
50 k
V
.8 V
V
1.0 V
1.273
0.5
V
ppm/ºC
%/ºC
2


Features EL7556AC EL7556AC Programmable CPU Powe r Supply Unit Features • EL7556C Pin Compatible • Improved Temperature an d Voltage Ranges • 6A Continuous Load Current • Precision Internal 1% Refe rence • 1.0V to 3.8V Output Voltage Internal Power MOSFETs • >90% Effi ciency • Synchronous Switching • Ad justable Slope Compensation • Over Te mperature Indicator • Pulse by Pulse Current Limiting • Operates up to 1MH z • 1.5% Typical Output Accuracy • Adjustable Oscillator w/Sync • Remote Enable/Disable • Intel P54 and P55 C ompatible • VCC2DET Interface www.Dat aSheet4U.com • Internal Soft Start G eneral Description The EL7556AC is an a djustable synchronous DC:DC switching r egulator optimized for a 5V input and 1 .0-3.8V output. By combining integrated NMOS power FETS with a fused-lead pack age the EL7556AC can supply up to 6A co ntinuous 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 .
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