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Part: EL7556BCM
Category:
Description: Pwm, Synchronous Switcher (Buck) Converter, 6 Amp, With Power Transistors, Vin=4.5/5.5V, Vout=1.0/3.8V, VCC2DET, P54 P55 Compatible
Company: Intersil Corporation
Datasheet: Download EL7556BCM datasheet File size : 485 kB
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®
F
MAT F OR D IN 6D TE D a Sheet PDA ta EL755 OR U
I
EE ON S
EL7556B
Oc to b e r 5, 2001 FN7292
Integrated Adjustable 6 Amp Synchronous Switcher
The EL7556B 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 fused-lead package, the EL7556B can supply up to 6A continuous output current without the use of external power devices or discrete 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 EL7556B 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 3.5V 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 EL7556B is available in a 28-pin SO package and is specified for operation over the full -40°C to +85°C temperature range.
Features
· EL7556/EL7556A Pin-compatible · Improved temperature and voltage ranges · 6A 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 · 5V to 1.0V DC:DC conversion · Por table electronics/instruments
Pinout
EL 7556B (28-PIN SO) TOP VIEW
R4 R3 100 150
V IN
D3
· P54 and P55 regulators · GTL + Bus power supply
1 C4 0.1µF 2 C7 39pF 3 C8 R5 5 5.1 6 7 C9 C12 1µF C3 1µF 8 9 10 11 12 Connect to VSSP for external feedback 13 14 220pF 4
FB1 CREF CSLOPE COSC VDD VIN VSSP VIN VSSP VSSP VSSP VSSP
FB2 28 CP C2V VSS 27 R1 26 20 25 R6 VHI 24 C6 LX LX LX LX VSSP VSSP TEST 23 0.1µF 22 21 20 19 18 17 L1 2.5µH C10 1mF 39.2 D1 C11 0.22µF C5 1µF D2 D4* (Optional)
Ordering Information
VOUT = 1V*(1+R3/R4)
VIN
660µF
PART NUMBER EL755 6BCM EL755 6BCM-T 13
PACKAGE 28-Pin SO 28-Pin SO
TAPE & REEL 13"
PKG. NO. M DP0027 MDP0027
VCC2DET 16 PWRGD OUTEN OT 15
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 EL7556ACM Only
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.
EL7556B
Absolute Maximum Ratings (TA = 25°C)
Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C Supply (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0V 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. CONDITIONS M IN T YP M AX UN IT
DESCRIPTION
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 OUT E N = 0 OUTEN = 0 VCC2DET = 4V, IL = 3A (See Fig. 1) VCC2DET = 0V, IL = 3A R3 = 150, R4 = 100 VDD = 5V, ±10% 0A
11 0 .1 3 3.500 2.500
25
mA mA
5 3.550 2.550 1 1
mA V V % % m A % °C °C
100 9
-40°C
±1 135 40
VCC2SEL = 4V, VOUT = 3.50V
±6 3. 1 5
±10
± 14
% V
4.15 VHYS = VDDON-VDDOFF 0.5 7 96
V V V /m 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 0.8 VCC2DET, OUTEN = 0 10 23 14 28.5 2 40 50 18 34 µA µA µA k V V V V
2
EL7556B
Electrical Specifications
PARAMETER VDD = VIN = 5V, COSC = 1nF, CSLOPE = 470pF, TA = 25°C unless otherwise specified. (Continued) CONDITIONS M IN T YP M AX UN IT
DESCRIPTION
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/°C ns ns Oscillator Ramp Amplitude Oscillator Charge Current Oscillator Discharge Current Oscillator initial accuracy Minimum oscillator sync width 0.2V
3
EL7556B Typical Performance Curves
Efficiency vs ILOAD (VOUT =3.5V) VDD=VIN=5.0V (±10%) 96 94 92 Efficiency (%) VDD=5V Efficiency (%) 90 88 86 84 82 80 0.5 75 TA=25°C 1 .5 2.5 3.5 IOUT (A) 4 .5 5.5 6.5 70 0.5 1.5 2.5 3.5 IOUT (A) 4.5 5.5 6.0 VDD=5.5V 90 VCC=2.5V 85 80 VCC=1V VDD=4.5V 95 VCC=3.5V 100 Efficiency vs ILOAD (VDD=5.0V)
Line Regulation (CSLOPE=100pF) 3.54 3.53 3.52 3.51 VOUT (V) 3.50 3.49 3.48 3.47 3.46 4.5 IOUT=6A TA=25°C 5.0 VIN (V) 5.5 IOUT=3A IOUT=0.5A VOUT (V) 3.54 3.53 3.52 3.51 3.50 3.49 3.48 3.47 3.46
Load Regulation (CSLOPE=100pF)
VIN=5V VIN=5.5V
VIN=4.5V TA=25°C 0.5 3 .0 IOUT (A) 6.0
Line Regulation vs CSLOPE (IOUT=3A) VDD=VIN=5.0V ±10% 0.8 0.7 0.6 VOUT (±) (%) 0.5 0.4 0.3 0.2 0.1 0.0 50 75 100 125 150 175 CSLOPE (pF) 0.1 VOUT=1A 0.0 VOUT=3.5A VOUT=2.5A VOUT (±) (%) 0.4 0.3 0.2 TA=25°C 0.5 0.6
Load Regulation vs CSLOPE (VIN=5.0V) IOUT=3A, +3A, -2.5A TA=25°C VOUT=3.5A VOUT=2.5A
VOUT=1A
50
75
100
125
150
175
CSLOPE (pF)
4
EL7556B Typical Performance Curves
Line Regulation vs CSLOPE VIN=VDD=5.0V ±10% 0.8 0.7 0.6 VOUT (±) (%) 0.5 0.4 0.3 0.2 0.1 0.0 50 IOUT=0.5A IOUT=6A VOUT (±) (%) TA=25°C 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 50 VIN=5V VIN=5.5V VIN=4.5V TA=25°C
(Continued)
Load Regulation vs CSLOPE IOUT=3A, +3A, -2.5A
75
100
125
150
175
75
100
125
150
175
CSLOPE (pF)
CSLOPE (pF)
VOUT vs CSLOPE (VIN=5.0V, ILOAD=0.5A) 1.5 1.0 1.0 0.5 Deviation in VOUT (%) VOUT (±) (%) 0.0 -0.5 -1.0 -1.5 -2.0 -1.0 -2.5 -3.0 50 TA=25°C 75 100 125 150 175 VOUT=3.5V VOUT=1V VOUT=2.5V 1.5
VOUT Variation vs Programmed Output Voltage [VIDEAL=(1+R3/R4)] TA=25°C
C
0.5
C
OS C=
SL OP E =1
0.0
00 pF 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
CSLOPE (pF)
FOSC vs COSC 10000 TA=25°C 1000 FOSC (kHz) FOSC (kHz) 520 510 500 490 480 470 460 1 10 450 100 COSC (pF) 1k 100k
FOSC vs Temperature
VDD=4.5V
100
VDD=5.5V
10
VDD=5V
0
20
40
60
80
100
120
140
Temperature (°C)
5
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