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Part: EL7556DCM
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, Improved Temp/voltage Range
Company: Intersil Corporation
Datasheet: Download EL7556DCM datasheet File size : 485 kB
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®
EL7556D
D a ta Sheet M a rc h 24, 2003 FN7339
Integrated Adjustable 6 Amp Synchronous Switcher
The EL7556D 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 EL7556D 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 EL7556D 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 EL7556D is available in a 28-pin SO package and is specified for operation over the full -40°C to +85°C temperature range.
Features
· 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
Ordering Information
PART NUMBER EL7556D CM EL7556D CM-T 13 PACKAGE 28-Pin SO 28-Pin SO TAPE & REEL 13" PKG. NO. M DP0027 MDP0027
· 5V to 1.0V DC:DC conversion · Portable electronics/instruments · P54 and P55 regulators · GTL+ Bus power supply
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.
EL7556D Pinout
EL 7556D (28-PIN SO) TOP VIEW
FB1 1 CREF 2 CSLOPE 3 COSC 4 VDD 5 VIN 6 VSSP 7 VIN 8 VSSP 9 VSSP 10 VSSP 11 VSSP 12 VCC2DET 13 OUTEN 14 28 FB2 27 CP 26 C2V 25 VSS 24 VHI 23 LX 22 LX 21 LX 20 LX 19 VSSP 18 VSSP 17 TEST 16 PWRGD 15 OT
Absolute Maximum Ratings (TA = 25°C)
Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C Supply (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0V Output Pins . . . . . . . . . . . . . . .-0.3V below GND, +0.3V above VDD Ambient Operating Temperature . . . . . . . . . . . . . . . .-40°C to +85°C 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. Typ 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
VDD = VIN = 5V, COSC = 1nF, CSLOPE = 470pF, TA = 25°C, unless otherwise specified. C OND I TIONS M IN T YP M AX UNIT
DESCRI PT ION
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
OUTEN = 4V, FOSC = 120kHz OUT E N = 0 OUT E N = 0 VCC2DET = 4V, IL = 3A (see Fig. 1) VCC2DET = 0V, IL = 3A, R3 = 150, R4 = 100 (see Fig. 1) VDD = 5V, ±10% 0A < ILOAD < 6A, relative to IL = 3A, continuous mode of operation (see Fig.1) IL = 6A, prior to continuous application of RSHORT, OUTEN connected to OT 3 . 4 50 2 . 4 50 -1 -1
11 0 .1 3 3. 5 0 0 2. 5 0 0
25
mA mA
5 3 . 5 50 2 . 5 50 1 1
mA V V % % m A %
100 9
-40°C < TA < 85°C
±1
2
EL7556D
Electrical Specifications
PARAMETER TOT THYS VPWRGD VDDOFF VDDON VHYS MSS DMAX VDD = VIN = 5V, COSC = 1nF, CSLOPE = 470pF, TA = 25°C, unless otherwise specified. C OND I TIONS M IN T YP 135 40 VCC2SEL = 4V, VOUT = 3.50V ±6 3.15 4. 15 VHYS = VDDON - VDDOFF 0 .5 7 96 ± 10 ± 14 M AX UNIT °C °C % V V V V /m s %
DESCRI PT ION 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
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
CONTROLLER - REFERENCE VREF VREFTC VREFLOAD Reference Accuracy Reference Voltage Tempco Reference Load Regulation 0 < ILOAD < 100µA 0. 5 I REF = 0 1. 2 4 7 1 . 2 60 50 0 .5 1. 2 7 3 V ppm/° C %/°C
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 < VOSC < 1.4V 0.2V < VOSC < 1.4V 105 1 .2 150 5 125 50 145 V µA mA kHz ns
3
EL7556D Typical Performance Curves
Efficiency vs ILOAD (VOUT =3.5V) VDD=VIN=5.0V (±10%) 100 VDD=4.5V 95 Efficiency (%) 90 VCC=2.5V 85 80 VCC=1V 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 VCC=3.5V Efficiency vs ILOAD (VDD=5.0V)
96 94 92 Efficiency (%) 90 88 86 84 82
VDD=5V
VDD=5.5V
80 0.5
Line Regulation (CSLOPE=100pF) 3.54 3.53 3.52 VOUT (V) VOUT (V) 3.51 3.50 3.49 3.48 3.47 3.46 4.5 IOUT=6A IOUT=3A IOUT=0.5A TA=25°C 3.54 3.53 3.52 3.51 3.50 3.49 3.48 3.47 3.46 5 .0 VIN (V) 5.5
Load Regulation (CSLOPE=100pF) TA=25°C
VIN=5V VIN=5.5V
VIN=4.5V
0.5
3.0 IOUT (A)
6.0
0.8 0.7 0.6 VOUT (±) (%)
Line Regulation vs CSLOPE (IOUT=3A) VDD=VIN=5.0V ±10% 0.6 TA=25°C 0.5
Load Regulation vs CSLOPE (VIN=5.0V) IOUT=3A, +3A, -2.5A TA=25°C VOUT=3.5A VOUT (±) (%) 0.4 0.3 0.2 0.1 VOUT=2.5A
0.5 0.4 0.3 0.2 0.1 0.0 50 75 VOUT=1A VOUT=3.5A VOUT=2.5A
VOUT=1A
0.0 100 125 150 175 50 75 100 125 150 175 CSLOPE (pF) CSLOPE (pF)
Line Regulation vs CSLOPE VIN=VDD=5.0V ±10% 0.8 TA=25°C 0.7 0.6 VOUT (±) (%) 0.5 0.4 0.3 0.2 0.1 0.0 50 75 100 125 150 175 IOUT=0.5A IOUT=6A VOUT (±) (%) 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.8
Load Regulation vs CSLOPE IOUT=3A, +3A, -2.5A TA=25°C
VIN=4.5V
VIN=5V
VIN=5.5V
0.0 50
75
100
125
150
175
CSLOPE (pF)
CSLOPE (pF)
4
EL7556D Typical Performance Curves
VOUT vs CSLOPE (VIN=5.0V, ILOAD=0.5A) TA=25°C 1.0 Deviation in VOUT (%) 0.5 VOUT (±) (%) 0.0 -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 50 75 100 125 150 175 -1.5 1.0 VOUT=3.5V VOUT=1V VOUT=2.5V 0.5 0.0 -0.5 -1.0 Loop Gain Induced Error 1.5 2.0 2.5 VIDEAL (V) 3.0 3.5 4.0
SL OP E =1 OS 00 C= p
1.5 1.0
1.5
VOUT Variation vs Programmed Output Voltage [VIDEAL=(1+R3/R4)] TA=25°C
C
C
F 22 0p F
CSLOPE (pF)
FOSC vs COSC 10k TA=25°C 510 1k FOSC (kHz) FOSC (kHz) 500 490 480 470 460 1 10 450 100 COSC (pF) 1k 100k 520
FOSC vs Temperature
VDD=4.5V
100
VDD=5.5V
10
VDD=5V
0
20
40
60
80
100
120
140
Temperature (°C)
I(VDD) + I(VIN) vs FOSC 60 50 40 IVIN (mA) IQ (mA) 30 20 10 Discontinuous Mode 0 200 400 600 FOSC (kHz) Continuous Mode 800 1000 VDD=5V TA=25°C OUTEN=VDD VDD=5.5V 16 14 12 10 8 6 4 2
I(VIN) vs FOSC TA=25°C OUTEN=VDD VDD=5.5V
VDD=5V
VDD=4.5V
VDD=4.5V
Discontinuous Mode 0 200 400 600 FOSC (kHz)
Continuous Mode 800 1000
I(VDD) vs FOSC 50 45 40 IDD (mA) + IVIN 35 IDD (mA) 30 25 20 15 10 5 0 200 400 600 FOSC (kHz) 800 1000 VDD=4.5V VDD=5V VDD=5.5V TA=25°C OUTEN=VDD 2.0
IDD + IVIN vs FOSC
VDD=5.5V 1.5 VDD=4.5V
VDD=5V
1.0 10
100 FOSC (kHz)
1000
5
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