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Part: EL7560
Category:
Description: Programmable Cpu Power Supply Unit
Company: Intersil Corporation
Datasheet: Download EL7560 datasheet File size : 485 kB
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Datasheet text preview:
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CT T ODU MEN E PR PLACE ter at LET D RE n O rt Ce m/tsc OBS ENDE uppo co OMM hnical S .intersil. EC D o a Tec or NO R ta tur Sheet www IL ac cont -INTERS -888 1
EL7560
Au g u st 21, 1998 FN7294
Programmable CPU Power Supply Unit
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. 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.
Features
· 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 · Low parts count · Pulse by pulse current limiting · High efficiency at light load · Operates up to 1MHz
Pinout
EL7560 (28-PIN SOIC) TOP VIEW
· 1% output accuracy · Sync function · Power good signal
5V
Applications
D2 1 CP1µF C5 100 3 C2V +10V D1 1µF C11 30 R1 4 VSS 5 VHI 6 LX 7 LX 8 LX 9 LX 10 LX 1 1 TEST 12 PWRGD 1 3 OT 1 4 OUTEN R2 10K COSC 25 10 VDD 2 4 .1µF VIN 23 VSSP 22 VIN 21 VSSP 20 VSSP 19 VID0 1 8 VID1 1 7 VID2 1 6 VID3 1 5 OUTPUT VOLTAGE* SELECT PGND C1 .1µF CSLOPE 26 2 CP+ FB 28 CREF 27 D3 R3 1K 4.7µF C4 68p C7 220p C8 ACND L2 1.5µH C9 2mF 5V
· PC motherboards · Local high power CPU supplies
Ordering Information
PART NUMBER EL756 0CM TEMP. RANGE -40°C to +85°C PACKAGE 28-Pin SOIC PKG. NO. M D P 0 0 27
.1µF C6 2.5µH L1 4mF C10
VOUT +2V - 3.5V
+5V
* See VID Table on page 3 Note: · AGND and PGND should be connected at C10 · D3 is 1.235V reference.
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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. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc. All other trademarks mentioned are the property of their respective owners.
EL7560
Absolute Maximum Ratings (TA = 25°C)
Supply (VIN, VDD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V Output Pins . . . . . . . . . . . . . . . -0.3V below GND, +0.3V above VDD Instantaneous Peak Output Current . . . . . . . . . . . . . . . . . . . . . .16A Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C Ambient Operating Temperature . . . . . . . . . . . . . . . .-40°C to +85°C Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 135°C Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3W
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: TJ = TC = TA
DC Electrical Specifications
PARA METER V2X DACLSB FOSC FOSCTC VRAMP MSS IVID ICSLOPE ID D IDDOFF RDSON RDSONTC VOUT VRANGE IL M A X VOUT-TC VOUT-LINE VOUT-LOAD VOUT-TOT OTOFF OTHYS VPWRGD VDD-ON VDD-OFF NOTE:
VDD = VIN = 5V, COSC = 1nF, CSLOPE = 68pF, TA = 25°C, unless otherwise specified (Note 1) C O N D I T IO N VDD=5V, ILOAD=20mA MIN 8. 0 0.095 105 0°C
DESCRIPTION Voltage Doubler Output DAC Resolution Oscillator Initial Accuracy Oscillator Tempco Oscillator Ramp Amplitude Soft Start Slope VID Pull Up Current CSLOPE Charging Current Supply Current Stdby Current Composite FET Resistance RDSON Tempco Output Initial Acurracy Output Voltage Range Maximum current Output Tempco Output Line Regulation Output Load Regulation Output Total Variation Over Temperature Threshold Over Temperature Hysteresis Power Good Threshold with Respect to Desired OutputVoltage Minimum VDD form Startup Maximum VDD for Shutdown
1. The oscillator and voltage doubler operate normally when VDD exceeds VDD-ON threshold, independent of the OUTEN logic level.
2
EL7560 Voltage Identification Codes
P6 PINS VID3 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 VID2 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 VID1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 VID0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 VDC 0, No CPU 2 .1 2 .2 2 .3 2 .4 2 .5 2 .6 2 .7 2 .8 2 .9 3 .0 3 .1 3 .2 3 .3 3 .4 3 .5
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EL7560 EL7560 Pin Descriptions
PIN NUMBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 NOTE: 1. The oscillator and voltage doubler operate normally when VDD exceeds VDD-ON threshold, independent of the OUTEN logic level. NAME CPCP+ C2V VSS VHI LX LX LX LX LX T EST PWRGD OT OT VID3 VID2 VID1 VID0 VSSP VSSP VI N VSSP VI N VDD COSC CSLOPE CREF FB DESCRIPTION Negative input for the charge pump bootstrap capacitor. (Note 1) Positive input for the charge pump bootstrap capacitor. (Note 1) Voltage doubler output. Pin requires at least a 1µF capacitor to GND. (Note 1) Ground return for the control circuitry. Positive supply for the high side driver. This pin is bootstrapped from the LX pin with a 0.1µF capacitor. Common connection between the two large internal FETs. External inductor connection. Same as pin 6. Same as pin 6. Same as pin 6. Same as pin 6. This is test pin and must remain grounded at all times Pin pulls high when the FB pin is within - 7%(typ) of its programmed value. Overtemperature indicator. Pulls low when the die temperature exceeds 135°C. Pin has 10mA pull-up. A logic high on OUTEN enables the regulator (Note 1) Bit 3(MSB) of the output voltage select DAC. Bit 2 of the output voltage select DAC. Bit 1 of the output voltage select DAC. Bit 0(LSB) of the output voltage select DAC. Ground return to the buck regulator. Same as pin 19. Positive power supply input to the buck regulator. Same as pin 19. Same as pin 21. Pin supplies power to the internal control circuitry. Oscillator timing capacitor. Oscillator Frequency is approximately: FOSC(Hz)=0.0001/COSC(F). The duty cycle is approximately 5%. (Note 1) Slope compensation capacitor. External reference input pin. Voltage feedback pin for the buck regulator.
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EL7560 Typical Performance Curves
IDD vs VDD 35 30 Frequency (kHz) 25 IDD (mA) 20 15 10 5 0 1 2 3 4 5 6 VDD (V) 10 10 10000 Oscillator Frequency vs COSC
1000
100
100
1000
10000
COSC (pF)
ILine Regulation (VID3:0=0000) 3.545 TA=25°C 3.535 3.525 VOUT (V) 3.515 3.505 3.495 3.485 3.475 3.465 4.4 IOUT = 11A IOUT = 8A IOUT = 0.3A 2.21 IOUT = 4A VOUT (V) 2.23
Line Regulation (VID3:0=1101) TA=25°C 2.22 IOUT = 0.3A
IOUT = 4A 2.20 2.19 IOUT = 8A 2.18 2.17 2.16 4.4 IOUT = 11A
4.6
4.8
5 .0 VIN (V)
5.2
5.4
5.6
4.6
4 .8
5 .0 VIN (V)
5.2
5.4
5.6
Load Regulation (VID3:0=0000) 3.54 3.53 3.52 VOUT (V) 3.51 3.50 3.49 3.48 2.17 3.47 3.46 0 2 4 6 IOUT (A) 8 10 12 2.15 VIN=5V TA=25°C 2.23 2.25
Load Regulation (VID3:0=1101) VIN=5V TA=25°C
VOUT (V)
2.21
2.19
0
2
4
6 IOUT (A)
8
10
12
5
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