廬
EL7571
Data Sheet
October 25, 2004
FN7298.1
Programmable PWM Controller
The EL7571 is a flexible, high efficiency, current mode, PWM
step down controller. It incorporates five bit DAC adjustable
output voltage control which conforms to the Intel Voltage
Regulation Module (VRM) Specification for Pentium廬 II and
Pentium廬 Pro class processors. The controller employs
synchronous rectification to deliver efficiencies greater than
90% over a wide range of supply voltages and load
conditions. The on-board oscillator frequency is externally
adjustable, or may be slaved to a system clock, allowing
optimization of RFI performance in critical applications. In
single supply operation, the high side FET driver supports
boot-strapped operation. For maximum flexibility, system
operation is possible from either a 5V rail, a single 12V rail,
or dual supply rails with the controller operating from 12V
and the power FETs from 5V.
Features
鈥?Pentium廬 II Compatible
鈥?5 bit DAC Controlled Output Voltage
鈥?Greater than 90% Efficiency
鈥?4.5V to 12.6V Input Range
鈥?Dual NMOS Power FET Drivers
鈥?Fixed frequency, Current Mode Control
鈥?Adjustable Oscillator with External Sync. Capability
鈥?Synchronous Switching
鈥?Internal Soft-Start
鈥?User Adjustable Slope Compensation
鈥?Pulse by Pulse Current Limiting
鈥?1% Typical Output Accuracy
Pinout
R2
5鈩?/div>
D1
C6 0.1碌F
L2
Q1
C8
1碌F
3 COSC
1.4V
C3
0.1碌F
5 PWRGD
POWER
GOOD
6 VIDO
7 VID1
Voltage
I.D. (VID
(0:4))
8 VID2
9 VID3
10 VID4
VINP 16
LSD 15
GNDP 14
C7
1碌F
Q2
D2
4 REF
LX 18
VIN 17
C1 1.5碌H
1000碌
F x3
4.5V
to
12.6V
V
OUT
1.3V to
3.5V
C2
1000碌F
x6
鈥?Power Good Signal
鈥?Output Power Down
鈥?Over Voltage Protection
鈥?/div>
Pb-Free Available (RoHS Compliant)
ENABLE
C3 240pF
1 OTEN
2 CSLOPE
C3 240pF
VH1 20
HSD 19
Applications
鈥?Pentium廬 II Voltage Regulation Modules (VRMs)
鈥?PC Motherboards
鈥?DC/DC Converters
鈥?GTL Bus Termination
鈥?Secondary Regulation
L1
5.1碌H
R2
5鈩?/div>
GND 13
CS 12
FB 11
Ordering Information
PART NUMBER
PACKAGE
20-Pin SO
20-Pin SO
20-Pin SO
(Pb-free)
20-Pin SO
(Pb-free)
TAPE AND
REEL
-
13鈥?/div>
-
13鈥?/div>
PKG. DWG. #
MDP0027
MDP0027
MDP0027
MDP0027
Q1, Q2: Siliconix, Si4410, x2
C1: Sanyo, 16MV 1000GX, 1000碌F x3
C2: Sanyo, 6MV 1000GX, 1000碌F x6
L1: Pulse Engineering, PE-53700, 5.1碌H
L2: Micrometals, T30-26, 7T AWG #20, 1.5碌H
R1: Dale, WSL-25-12, 15m鈩? x2
D1: BAV99
D2: IR, 32CTQ030
EL7571CM
EL7571CM-T13
EL7571CMZ
(See Note)
EL7571CMZ-T13
(See Note)
NOTE: Intersil Pb-free products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which are RoHS compliant and compatible
with both SnPb and Pb-free soldering operations. Intersil Pb-free
products are MSL classified at Pb-free peak reflow temperatures that
meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020C.
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 漏 Intersil Americas Inc. 2003-2004. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
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