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Part: EL7558DCM
Category:
Description: Pwm, Synchronous Switcher (Buck) Converter, 8 Amp Continuous, 1Mhz, With Power Transistors, Vin=4.5/5.5V, Vout=1.0/3.8V, Vcc2DET For P54/P55, 1% Reference
Company: Intersil Corporation
Datasheet: Download EL7558DCM datasheet File size : 485 kB
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®
EL7558D
D a ta Sheet M a rch 27, 2003 FN7342
Integrated Adjustable 8 Amp Synchronous Switcher
The EL7558D is an adjustable synchronous DC:DC switching regulator optimized for a 5V input and 1.0V-3.8V output. By combining integrated NMOS power FETS with a HSOP package the EL7558D can supply up to 8A continuous output current without the use of external power devices or externally attached heat sinks, thereby minimizing design effort and overall system cost. On-chip resistorless current sensing is used to achieve stable, highly efficient, current-mode control. The EL7558D also incorporates the VCC2DET function to directly interface with the Intel P54 and P55 microprocessors. Depending on the state of VCC2DET, the output voltage is internally preset to 3.50V or a user-adjustable voltage using two external resistors. In both internal and external feedback modes the active-high PWRGD output indicates when the regulator output is within ±10% of the programmed voltage. An onboard sensor monitors die temperature (OT) for overtemperature conditions and can be connected directly to OUTEN to provide automatic thermal shutdown. Adjustable oscillator frequency and slope compensation allow added flexibility in overall system design. The EL7558D is available in the 28-pin HSOP package and is specified for operation over the -40°C to +85°C temperature range.
Features
· Improved temperature and voltage ranges · 8A continuous load current · Precision internal 1% reference · 1.0V to 3.8V output voltage · Internal power MOSFETs · >90% efficiency · Synchronous switching · Adjustable slope compensation · Over-temperature indicator · Pulse-by-pulse current limiting · Operates up to 1MHz · 1.5% typical output accuracy · Adjustable oscillator with sync · Remote enable/disable · Intel P54- and P55-compatible · VCC2DET interface · Internal soft-start
Applications
· PC motherboards · Local high power CPU supplies
Pinout
EL 7558D (28-PIN HSOP) TOP VIEW
R4 R3
· 5V to 1.0V DC:DC conversion · Por table electronics/instruments · P54 and P55 regulators
VIN
D3
100
150
· GTL+ Bus power supply
1
FB1 CREF CSLOPE COSC VDD VIN VSSP VIN VSSP VSSP VSSP VSSP
FB2 28 CP C2V VSS
27
C4
0.1µF
2
C5 R1 1µF D2 D4* (Optional) 20
C7
220pF
3 26 25
Ordering Information
PART NUMBER EL755 8DCM
VOUT
C8 R5
330pF
4 5
R6 VHI 24 C6
6 7
D1
C11 0.22µF
5.1 LX LX LX LX VSSP VSSP TEST
23
39.2
PACKAGE 28-Pin HSOP 28-Pin HSOP
TAPE & REEL 13"
PKG. NO. M DP0042 MDP0042
0.1µF
22 21 20 19 18 17
VIN
C9 660µF C3 1µF
C12 1µF
8 9 10 11 12
L1
2.5µH C10 1mF
EL755 8DCM-T 13
Connect to VSSP for external feedback
C12 = 1µF C3, C4, C5, C6, C7 C8 - ceramic C5, C11 - ceramic or tantalum C9 - Sprague 293D337X96R3 2X330µF C10 - Sprague 293D337X96R3 3X330µF L1 - Pulse Engineering, PE-53681 D1 - D4: BAT54S fast diode D4 Required for EL7558ACM only
13 14
VCC2DET 16 PWRGD OUTEN OT
15
Manufactured under U.S. Patents No. 5,723,974 and No. 5,793,126
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. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc. All other trademarks mentioned are the property of their respective owners.
EL7558D
Absolute Maximum Ratings (TA = 25°C)
Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C Supply (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6V Ambient Operating Temperature . . . . . . . . . . . . . . . .-40°C to +85°C Output Pins . . . . . . . . . . . . . . .-0.3V below GND, +0.3V above VDD Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 135°C Peak Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9A
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
Electrical Specifications
PARAMETER GENERAL IDD IDDOFF IVIN VOUT1 VOUT2 VOUTLINE VOUTLOAD RSHORT II MAX VOUTTC TOT THYS VPWRGD VDDOFF VDDON VHYS MSS DMAX
VDD = VIN = 5V, COSC = 1nF, CSLOPE = 470pF, TA = 25°C unless otherwise specified. DESCRIPTION CONDITIONS M IN TYP M AX UNIT
VDD Supply Current VDD Standby Current VIN No Load Current Output Initial Accuracy Output Initial Accuracy Output line Regulation Output Load Regulation Short Circuit Load Resistance Current Limit Output Tempco Over Temperature Threshold Over Temperature Hysteresis Power Good Threshold Relative to Programmed Output Voltage Minimum VDD for Shutdown Maximum VDD for Startup Input Hysteresis Soft start slope Maximum duty cycle
OUTEN = 4V, FOSC = 120kHz OUTEN = 0 OUTEN = 0 VCC2DET = 4V, IL = 3A VCC2DET = 0V, IL = 3A R3 = 150, R4 = 100 VDD = 5V, ±10% 0A
11 0.1 3 3.500 2.500
25
mA mA
5 3 .5 5 0 2 .5 5 0 1 1
mA V V % % m A % °C °C
100 9
-40°C
±1 135 40
VCC2SEL = 4V, VOUT = 3.50V
±6 3.15
±10
± 14
% V
4 .1 5 VHYS = VDDON-VDDOFF 0.5 7 96
V V V /n s %
CONTROLLER - INPUTS IPUP ICSLOPE IFB1 ROT VIH VIL VOH PWGD VOL PWGD VCC2DET, OUTEN Pull Up Current Cslope Charging Current FB1 Input Pull Up Current Over Temperature Pull Up Resistance VCC2DET, OUTEN Input High VCC2DET, OUTEN Input Low Powergood Drive High Powergood Drive Low ILoad = 1mA ILoad = -1mA 3 .5 1.0 OT = 0V 30 4 .8 VCC2DET, OUTEN = 0 10 23 14 28.5 2 40 50 18 34 µA µA µA k V V V V
2
EL7558D
Electrical Specifications
PARAMET ER CONTROLLER - REFERENCE VREF VREFTC VREFLOAD Reference Accuracy Reference Voltage Tempco Reference Load Regulation 0
CONTROLLER - DOUBLER VC2V Voltage Doubler Output VDD = 5V, ILOAD = 10mA 7. 5 8.1 8. 7 V
CONTROLLER - OSCILLATOR FRAMP IOSC CHG IOSC DIS FOSC tsync POWER - FET ILEAK RDSON RDSONTC tBRM tLEB LX Output Leakage to VSS Composite FET Resistance RDSON Tempco FET break before make delay High side FET minimum on time (LEB) LX = 0V 18 0.1 10 140 100 30 µA m m/ºC ns ns Oscillator Ramp Amplitude Oscillator Charge Current Oscillator Discharge Current Oscillator initial accuracy Minimum oscillator sync width 0.2V
3
EL7558D Typical Performance Curves
Efficiency vs ILOAD (VOUT=3.5V) 97 100 VOUT=3.5V Efficiency vs ILOAD (VDD=5.0 V)
95
VDD=4.5V VDD=5V VDD=5.5V
95
Efficiency (%)
91
Efficiency (%)
93
90
VOUT=2.5V
85
89
80
VOUT=1V
87 TA=25°C 85 0.5 1.5 2 .5 3.5 4 .5 IOUT (A) 5 .5 6.5 7 .5 8.0
75 TA=25°C 70 0.5 1.5 2 .5 3.5 4 .5 IOUT (A) 5 .5 6.5 7 .5 8.0
Line Regulation (CSLOPE=150pF) 3.54 TA=25°C 3.53 3.52 VOUT (V) 3.51 3.50 3.49 3.48 3.47 4.5 IOUT=0.5A VOUT (V) 3.54 3.53 3.52 3.51 IOUT=4A 3.50 3.49 IOUT=8A 3.48 3.47
Load Regulation (CSLOPE=150pF)
VIN=5.5V
VIN=5V VIN=4.5V
TA=25°C 1 2 3 4 IOUT (A) 5 6 7 8
5.0 VIN (V)
5 .5
3.46 0.5
Line Regulation vs CSLOPE (IOUT=3A) VDD=VIN=5.0V ±10% 0.8 0.7 0.6 VOUT (±) (%) VOUT (±) (%) 0.5 0.4 0.3 0.2 0.1 0.0 50 75 100 125 150 175 CSLOPE (pF) 0.1 VOUT=1V 0.0 VOUT=3.5V 0.4 TA=25°C 0.5 0.6
Load Regulation vs CSLOPE (VIN=5.0V) IOUT=0.5 to 6A
TA=25°C VOUT=3.5V VOUT=2.5V 0.3
VOUT=2.5V
0.2 VOUT=1V
50
75
100
125
150
175
CSLOPE (pF)
4
EL7558D Typical Performance Curves
(Continued)
Line Regulation vs CSLOPE VIN=VDD=5.0V ±10% 0.8 0.7 0.6 VOUT (±) (%) IOUT=0.5A VOUT (±) (%) 0.5 0.4 0.3 0.2 0.1 0.0 50 75 100 125 150 175 CSLOPE (pF) IOUT=6A TA=25°C 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1
Load Regulation vs CSLOPE IOUT=0.5 to 6A
TA=25°C
VIN=4.5A VIN=5A
VIN=5.5A
0.0 50
75
100
125
150
175
CSLOPE (pF)
VOUT vs CSLOPE (VIN=5.0V, ILOAD=.5A) 1.5 1.0 0.5 VOUT (±) (%) 0.0 -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 50 75 100 125 150 175 CSLOPE (pF) VOUT=3.5V -1.0 TA=25°C VOUT=2.5V VOUT=1V Deviation in VOUT (%) 1.0 1.5
VOUT Variation vs Programmed Output Voltage [VIDEAL=(1+R3/R4)] TA=25°C
0.5
C
C
SL
0.0
OS C=
OP E=
10 0p F 22 0p F
-0.5
Loop Gain Induced Error -1.5 1.0 1.5 2.0 2.5 VIDEAL (V) 3.0 3.5 4 .0
FOSC vs COSC 10000 TA=25°C 510 1000 FOSC(kHz) FOSC(kHz) 520
FOSC vs Temperature
VDD=4.5V 500 490 480 470 460 VDD=5V VDD=5.5V
100
10
COSC=220pF
1 10 100 COSC (pF) 1000 100000
450 0 20 40 60 80 100 120 140 Temperature (°C)
5
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