EL7571 Datasheet, PDF (1/19 Pages) Intersil Corporation – Programmable PWM Controller

®
Data Sheet
October 25, 2004
EL7571
FN7298.1
Programmable PWM Controller
Features
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® II and
Pentium® 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.
• Pentium® II Compatible
• 5 bit DAC Controlled Output Voltage
• Greater than 90% Efficiency
• 4.5V to 12.6V Input Range
• Dual NMOS Power FET Drivers
• Fixed frequency, Current Mode Control
• Adjustable Oscillator with External Sync. Capability
• Synchronous Switching
• Internal Soft-Start
• User Adjustable Slope Compensation
• Pulse by Pulse Current Limiting
Pinout
ENABLE
1 OTEN
C3 240pF
2 CSLOPE
C3 240pF
3 COSC
1.4V
C3
0.1µF
4 REF
POWER
GOOD
5 PWRGD
6 VIDO
VH1 20
HSD 19
LX 18
VIN 17
VINP 16
LSD 15
Voltage
I.D. (VID
(0:4))
7 VID1
8 VID2
GNDP 14
GND 13
• 1% Typical Output Accuracy
R2
• Power Good Signal
5Ω
D1
• Output Power Down
C6 0.1µF
Q1
C8
1µF
L2
C1 1.5µH
1000µ
F x3
• Over Voltage Protection
4.5V ^{• Pb-Free Available (RoHS Compliant)}
to
12.6V _Applications
V_OUT
1.3V to
• Pentium® II Voltage Regulation Modules (VRMs)
L1 R2 3.5V
C7
5.1µH _5Ω
C2
• PC Motherboards
1µF
1000µF
x6
•
DC/DC Converters
Q2 D2
• GTL Bus Termination
• Secondary Regulation
9 VID3
10 VID4
CS 12
FB 11
Q1, Q2: Siliconix, Si4410, x2
C1: Sanyo, 16MV 1000GX, 1000µF x3
C2: Sanyo, 6MV 1000GX, 1000µF x6
L1: Pulse Engineering, PE-53700, 5.1µH
L2: Micrometals, T30-26, 7T AWG #20, 1.5µH
R1: Dale, WSL-25-12, 15mΩ, x2
D1: BAV99
D2: IR, 32CTQ030
Ordering Information
PART NUMBER
EL7571CM
EL7571CM-T13
EL7571CMZ
(See Note)
PACKAGE
20-Pin SO
20-Pin SO
20-Pin SO
(Pb-free)
TAPE AND
REEL
-
13”
-
PKG. DWG. #
MDP0027
MDP0027
MDP0027
EL7571CMZ-T13 20-Pin SO
13”
MDP0027
(See Note)
(Pb-free)
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.
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