EL7560 Datasheet, PDF (1/7 Pages) Intersil Corporation – Programmable CPU Power Supply Unit

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August 21, 1998
EL7560
FN7294
Programmable CPU Power Supply Unit
Features
The EL7560 is the simplest, most cost
effective method for powering modern
high power CPUs which require a user
adjustable output voltage. Although it is particularly designed
to function with next generation CPUs, its simple design can
provide low cost solutions for any 5V to 3V application.
The circuit uses on chip resistorless current sensing for high
efficiency, stable current mode control. An on chip
temperature sensor resets the OT pin. The OT pin can be
tied directly to the OUTEN pin for automatic overtemperature
shutdown. The user can adjust the oscillator frequency as
well as the slope compensation.
• 3.3V @ 12.4amps continuous
• Internal FETs
• >90% efficiency
• Synchronous switching
• 4-bit digitally adjustable output voltage
• User adjustable slope compensation
• Internal soft start
• Over temperature indicator
• Low current sleep mode
The output voltage is adjustable using a 4-bit parallel
interface. A power OK signal "PWRGD' pulls high when the
FB pin is within -7% of the programmed value.
Pinout
EL7560
(28-PIN SOIC)
TOP VIEW
• Low parts count
• Pulse by pulse current limiting
• High efficiency at light load
• Operates up to 1MHz
• 1% output accuracy
• Sync function
• Power good signal
5V
Applications
1 CP-
D2
1µF
C5
2 CP+
D1
+10V
1µF
C11
100
3 C2V
R1
4 VSS
.1µF
5 VHI
30Ω
FB 28
CREF 27
CSLOPE 26
COSC 25
VDD 24
R3
1K
D3
10Ω
.1µF
4.7µF
C4
68p
C7
220p
C8
ACND
L2
1.5µH
• PC motherboards
• Local high power CPU supplies
Ordering Information
PART
NUMBER TEMP. RANGE PACKAGE
C6
6 LX
VIN 23
C1 C9
5V _{EL7560CM -40°C to +85°C 28-Pin SOIC}
VOUT
2.5µH
L1
7 LX
VSSP 22
.1µF 2mF
+2V - 3.5V
4mF
C10
8 LX
VIN 21
9 LX
VSSP 20 PGND
10 LX
VSSP 19
11 TEST
VID0 18
12 PWRGD VID1 17
+5V
OUTPUT
VOLTAGE*
13 OT
VID2 16
SELECT
14 OUTEN VID3 15
R2
10K
* See VID Table on page 3
Note:
• AGND and PGND should be connected at C10
• D3 is 1.235V reference.
PKG. NO.
MDP0027
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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