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Part: EL7558BC
Category:
Power Management
-> DC-DC Converters
Description: Integrated Adjustable 8 Amp Synchronous Switcher
Company: Elantec Semiconductor, Inc. (acquired by Intersil)
Datasheet: Download EL7558BC datasheet File size : 485 kB
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EL7558BC
EL7558BC
Integrated Adjustable 8 Amp Synchronous Switcher
Features
· EL7558C/EL7558AC pincompatible · 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
General Description
The EL7558BC 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 EL7558BC 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 EL7558BC 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 on-board sensor monitors die temperature (OT) for over-temperature 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 EL7558BC is available in the 28-pin HSOP package and is specified for operation over the -40°C to +85°C temperature range.
Applications
· · · · · · PC motherboards Local high power CPU supplies 5V to 1.0V DC:DC conversion Portable electronics/instruments P54 and P55 regulators GTL+ Bus power supply
Connection Diagram
R4 R3 100 150
VIN
D3
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)
C7
220pF
3 26
C8 R5
330pF
4 5 25
20 R6 VHI 24 C6
6
D1
C11 0.22µF
5.1 LX LX LX LX VSSP VSSP TEST
23
39.2
0.1µF
Ordering Information
Part No EL7558BCM EL7558BCM-T13 Package 28-Pin HSOP 28-Pin HSOP Tape & Reel 13"
7
22 21 20 19 18 17
VIN
Outline # MDP0042 MDP0042
C9 660µF C3 1µF
C12 1µF
8 9 10 11 12
L1
2.5µH C10 1mF
VOUT
Connect to VSSP for external feedback
13 14
VCC2DET 16 PWRGD OUTEN OT
15
April 27, 2001
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
EL7558BC
Manufactured under U.S. Patents No. 5,723,974 and No. 5,793,126
Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a "controlled document". Current revisions, if any, to these specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation.
© 2001 Elantec Semiconductor, Inc.
EL7558BC
EL7558BC
Integrated Adjustable 8 Amp Synchronous Switcher
Absolute Maximum Ratings (T
Storage Temperature Range Supply (VIN) Ambient Operating Temperature
A
= 25°C)
-65°C to +150°C 6V -40°C to +85°C
Output Pins Operating Junction Temperature Peak Output Current
-0.3V below GND, +0.3V above VDD 135°C 9A
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 Characteristics
VDD = VIN = 5V, COSC = 1nF, CSLOPE = 470pF, TA = 25°C unless otherwise specified. Parameter General IDD ID D O F F IV I N VO U T 1 VO U T 2 VO U T L I N E VO U T L O A D RSHORT II MAX VO U T T C TOT TH Y S VP W R G D VD D O F F VD D O N VH Y S MSS DM A X IP U P IC S L O P E IF B 1 ROT VI H VI L VOH PWGD VOL PWGD VR E F VR E F T C VR E F L O A D 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 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 Reference Accuracy Reference Voltage Tempco Reference Load Regulation 0
Controller - Inputs
Controller - Reference
2
EL7558BC
EL7558BC
Integrated Adjustable 8 Amp Synchronous Switcher
Electrical Characteristics
VDD = VIN = 5V, COSC = 1nF, CSLOPE = 470pF, TA = 25°C unless otherwise specified. Parameter Controller - Doubler VC 2 V FRAMP IOSC CHG IOSC DIS FOSC tsync Power - FET IL E A K 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 Voltage Doubler Output Oscillator Ramp Amplitude Oscillator Charge Current Oscillator Discharge Current Oscillator initial accuracy Minimum oscillator sync width 0.2V
3
EL7558BC
EL7558BC
Integrated Adjustable 8 Amp Synchronous Switcher
Typical Performance Curves
Efficiency vs ILOAD (VOUT=3.5V) 97 95 93 Efficiency (%) 91 89 87 TA=25°C 85 0.5 1.5 2.5 3.5 4.5 IOUT (A) Line Regulation (C SLOPE=150pF) 3.54 3.53 3.52 VOUT (V) 3.51 3.50 3.49 3.48 3.47 IOUT=8A TA=25°C IOUT=0.5A IOUT=4A VOUT (V) 3.54 3.53 3.52 3.51 3.50 3.49 3.48 3.47 4.5 5.0 VIN (V) 5.5 3.46 0.5 TA=25°C 1 2 3 4 IOUT (A) 5 6 7 8 VIN=5V VIN=4.5V VIN=5.5V 5.5 6.5 7.5 8.0 70 0.5 VDD=5V VDD=5.5V VDD=4.5V 100 95 90 85 80 75 TA=25°C 1.5 2.5 3.5 4.5 IOUT (A) Load Regulation (CSLOPE=150pF) 5.5 6.5 7.5 8.0 VOUT=1V VOUT=2.5V VOUT=3.5V Efficiency vs ILOAD (VDD=5.0 V)
0.8 0.7 0.6 VOUT (±) (%)
Line Regulation vs CSLOPE (IOUT=3A) VDD=VIN=5.0V ±10% TA=25°C
Efficiency (%)
0.6 0.5
Load Regulation vs CSLOPE (VIN=5.0V) IOUT=0.5 to 6A TA=25°C VOUT=3.5V
VOUT (±) (%)
0.5 0.4 0.3 0.2 0.1 0.0 50
VOUT=3.5V VOUT=2.5V
0.4 VOUT=2.5V 0.3 0.2 VOUT=1V 0.1
VOUT=1V 75 100 125 150 175 0.0 50 75 100 125 150 175
CSLOPE (pF)
CSLOPE (pF)
4
EL7558BC
EL7558BC
Integrated Adjustable 8 Amp Synchronous Switcher
Typical Performance Curves
Line Regulation vs CSLOPE VIN=VDD=5.0V ±10% TA=25°C Load Regulation vs C SLOPE IOUT=0.5 to 6A TA=25°C
0.8 0.7 0.6 VOUT (±) (%)
0.8 0.7 0.6 VOUT (±) (%)
0.5 0.4 0.3 0.2 0.1 0.0 50
IOUT=0.5A
0.5 0.4 0.3 0.2 0.1
VIN=4.5A VIN=5A
IOUT=6A
VIN=5.5A
75
100 125 CSLOPE (pF)
150
175
0.0 50
75
100 125 CSLOPE (pF)
150
175
1.5 1.0 0.5 VOUT (±) (%) 0.0 -0.5 -1.0 -1.5 -2.0 -2.5 -3.0
VOUT vs CSLOPE (VIN=5.0V, I LOAD=.5A)
1.5 1.0 Deviation in VOUT (%) 0.5 0.0 -0.5 -1.0 TA=25°C
VOUT Variation vs Programmed Output Voltage [VIDEAL=(1+R3/R4)] TA=25°C
VOUT=1V
CS CO
VOUT=2.5V
SC =
LO PE = 1
22 0p
00
pF
F
VOUT=3.5V
50
75
100 125 CSLOPE (pF)
150
175
-1.5 1.0
Loop Gain Induced Error 1.5 2.0 2.5 VIDEAL (V) 3.0 3.5 4.0
FOSC vs COSC 10000 TA=25°C 1000 FOSC(kHz) FOSC(kHz) 520 510 500 490 480 470 460 1 10 100 COSC (pF) 1000 100000 450
FOSC vs Temperature
VDD=4.5V
100
VDD=5.5V
10
VDD=5V
COSC=220pF 60 80 100 120 140
0
20
40
Temperature (°C)
5
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