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EL7571CMZ

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
1
®
FN7298.1
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. 2003-2004. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
EL7571
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® 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.
Pinout
Features
• 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
• 1% Typical Output Accuracy
• Power Good Signal
•Output Power Down
• Over Voltage Protection
• Pb-Free Available (RoHS Compliant)
Applications
• Pentium® II Voltage Regulation Modules (VRMs)
• PC Motherboards
• DC/DC Converters
• GTL Bus Termination
• Secondary Regulation
1
2
3
4
16
15
14
13
5
6
7
12
11
9
8
10
20
19
18
17
OTEN
VID4
VID3
VID2
VID1
VIDO
PWRGD
REF
COSC
CSLOPE
VH1
FB
CS
GND
GNDP
LSD
VINP
VIN
LX
HSD
ENABLE
POWER
GOOD
Voltage
I.D. (VID
(0:4))
C3 240pF
C3 240pF
C3
0.1µF
1.4V
C6 0.1µF
R2
5Ω
D1
Q1
C8
1µF
C1
1000µ
F x3
L2
1.5µH
4.5V
to
12.6V
L1
5.1µH
R2
5Ω
C2
1000µF
x6
C7
1µF
Q2
D2
V
OUT
1.3V to
3.5V
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 PACKAGE
TAPE AND
REEL PKG. DWG. #
EL7571CM 20-Pin SO - MDP0027
EL7571CM-T13 20-Pin SO 13” MDP0027
EL7571CMZ
(See Note)
20-Pin SO
(Pb-free)
- MDP0027
EL7571CMZ-T13
(See Note)
20-Pin SO
(Pb-free)
13” MDP0027
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.
Data Sheet October 25, 2004
2
Absolute Maximum Ratings (T
A
= 25°C)
Supply Voltage: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 14V
Input Pin Voltage:. . . . . . . . . -.03 below Ground, +0.3 above Supply
VHI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.5V to 27V
Storage Temperature Range:. . . . . . . . . . . . . . . . . . 65°C to +150°C
Operating Temperature Range: . . . . . . . . . . . . . . . . . . 0°C to +70°C
Operating Junction Temperature:. . . . . . . . . . . . . . . . . . . . . . . 125°C
Peak Output Current:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3A
Power Dissipation: . . . . . . . . . . . . . . . . . . . . . . . . . . . .SO20 500mW
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: T
J
= T
C
= T
A
DC Electrical Specifications T
A
= 25°C, V
IN
= 5V, C
OSC
= 330pF, C
SLOPE
= 390pF, R
SENSE
= 7.5mΩ unless otherwise specified.
PARAMETER DESCRIPTION CONDITION MIN TYP MAX UNIT
V
IN
Input Voltage Range 4.5 12.6 V
V
UVLO HI
Input Under Voltage Lock out Upper
Limit
Positive going input voltage 3.6 4 4.4 V
V
UVLO LO
Input Under Voltage Lock out Lower
Limit
Negative going input voltage 3.15 3.5 3.85 V
V
OUT RANGE
Output Voltage Range See VID table 1.3 3.5 V
V
OUT 1
Steady State Output Voltage Accuracy,
VID = 10111
I
L
= 6.5A, V
OUT
= 2.8V 2.74 2.82 2.90 V
V
OUT 2
Steady State Output Voltage Accuracy,
VID = 00101
I
L
= 6.5A, V
OUT
=1.8V 1.74 1.81 1.9 V
V
REF
Reference Voltage 1.396 1.41 1.424 V
V
ILIM
Current Limit Voltage V
ILIM
= (V
CS
-V
FB
) 125 154 185 mV
V
IREV
Current Reversal Threshold V
IREV
= (V
CS
-V
FB
) -40 -5 20 mV
V
OUT PG
Output Voltage Power Good Lower
Level
V
OUT
= 2.05V -18 -14 -10 %
Output Voltage Power Good Upper
Level
81216%
V
OVP
Over-Voltage Protection Threshold +9 +13 +17 %
V
OTEN LO
Power Down Input Low Level V
IN
= -10uA 1.5 V
V
OTEN HI
Power Down Input High Level (V
IN
-1.5) V
V
ID LO
Voltage I.D. Input Low Level 1.5 V
V
ID HI
Voltage I.D. Input High Level (V
IN
-1.5) V
V
OSC
Oscillator Voltage Swing 0.85 V
P-P
V
PWRGD LO
Power Good Output Low Level I
OUT
= 1mA 0.5 V
R
DS ON
HSD, LSD Switch On-Resistance V
IN
, V
INP
= 12V, I
OUT
= 100mA,
(VHI-LX) = 12V
4.8 6 Ω
R
FB
FB Input Impedance 9.5 kΩ
R
CS
CS Input Impedance 115 kΩ
I
VIN
Quiescent Supply Current V
OTEN
>(V
IN
-0.5)V 1.2 2 mA
I
VIN DIS
Supply Current in Output Disable Mode V
OTEN
<1.5V 0.76 1 mA
I
SOURCE/SINK
Peak Driver Output Current V
IN
,V
INP
= 12V, Measured at HSD,
LSD, (VHI-LX) = 12V
2.5 A
I
RAMP
C
SLOPE
Ramp Current High Side Switch Active 8.5 14 20 µA
I
OSC CHARGE
Oscillator Charge Current 1.2>V
OSC
>0.35V 50 µA
I
OSC DISCHARGE
Oscillator Discharge Current 1.2>V
OSC
>0.35V 2 mA
I
REFMAX
VREF Output Current 25 µA
EL7571
3
NOTE: Pin designators: I = Input, O = Output, S = Supply
I
VID
VID Input Pull up Current 3 5 7 µA
I
OTEN
OTEN Input Pull up Current 3 5 7 µA
DC Electrical Specifications T
A
= 25°C, V
IN
= 5V, C
OSC
= 330pF, C
SLOPE
= 390pF, R
SENSE
= 7.5mΩ unless otherwise specified.
(Continued)
PARAMETER DESCRIPTION CONDITION MIN TYP MAX UNIT
AC Electrical Specifications T
A
= 25°C, V
IN
= 5V, C
OSC
= 330pF, C
SLOPE
= 390pF unless otherwise specified.
PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT
f
OSC
Nominal Oscillator Frequency C
OSC
= 330pF 140 190 240 kHz
f
CLK
Clock Frequency 50 500 1000 kHz
t
OTEN
Shutdown Delay V
OTEN
>1.5V 100 ns
t
SYNC
Oscillator Sync. Pulse Width Oscillator i/p (COSC) driven with
HCMOS gate
20 800 ns
T
START
Soft-start Period V
OUT
= 3.5V 100/f
CLK
us
D
MAX
Maximum Duty Cycle 97 %
Pin Descriptions
PIN NO. PIN NAME
PIN TYPE
(NOTE 1) FUNCTION
1 OTEN I Chip enable input, internal pull up (5mA typical). Active high.
2 CSLOPE I With a capacitor attached from CSLOPE to GND, generates the voltage ramp compensation for the PWM
current mode controller. Slope rate is determined by an internal 14uA pull up and the C
SLOPE
capacitor
value. VC
SLOPE
is reset to ground at the termination of the high side cycle.
3 COSC I Multi-function pin: with a timing capacitor attached, sets the internal oscillator rate f
S
(kHz) = 57/C
OSC
(µF);
when pulsed low for a duration t
SYNC
synchronizes device to an external clock.
4 REF O Band gap reference output. Decouple to GND with 0.1uF.
5 PWRGD O Power good, open drain output. Set low whenever the output voltage is not within ±13% of the programmed
value.
6 VID0 I Bit 0 of the output voltage select DAC. Internal pull up sets input high when not driven.
7 VID1 I Bit 1 of the output voltage select DAC. Internal pull up sets input high when not driven.
8 VID2 I Bit 2 of the output voltage select DAC. Internal pull up sets input high when not driven.
9 VID3 I Bit 3 of the output voltage select DAC. Internal pull up sets input high when not driven.
10 VID4 I Bit 4 of the output voltage select DAC. Internal pull up sets input high when not driven.
11 FB I Voltage regulation feedback input. Tie to V
OUT
for normal operation.
12 CS I Current sense. Current feedback input of PWM controller and over current capacitor input. Current limit
threshold set at +154mV with respect to FB. Connect sense resistor between CS and FB for normal
operation.
13 GND S Ground
14 GNDP S Power ground for low side FET driver. Tie to GND for normal operation.
15 LSD O Low side gate drive output.
16 VINP S Input supply voltage for low side FET driver. Tie to VIN for normal operation.
17 VIN S Input supply voltage for control unit.
18 LX S Negative supply input for high side FET driver.
19 HSD O High side gate drive output. Driver ground referenced to LX. Driver supply may be bootstrapped to enhance
low controller input voltage operation.
20 VH1 S Positive supply input for high side FET driver.
EL7571
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

EL7571CMZ

Mfr. #:
Buy EL7571CMZ
Manufacturer:
Renesas / Intersil
Description:
IC REG CTRLR INTEL 2OUT 20SO
Lifecycle:
New from this manufacturer.
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