EL7556BCM ELANTEC [Elantec Semiconductor], EL7556BCM Datasheet

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EL7556BCM

Manufacturer Part Number
EL7556BCM
Description
Integrated Adjustable 6 Amp Synchronous Switcher
Manufacturer
ELANTEC [Elantec Semiconductor]
Datasheet

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Part Number
Manufacturer
Quantity
Price
Part Number:
EL7556BCM
Manufacturer:
EL
Quantity:
20 000
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.
Features
Applications
Ordering Information
• EL7556C/EL7556AC Pin-
• Improved temperature and voltage
• 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
• 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
EL7556BCM
EL7556BCM-T13
compatible
ranges
Part No
28-Pin SO
28-Pin SO
Package
Tape &
Reel
13”
-
MDP0027
MDP0027
Outline #
EL7556BC
Integrated Adjustable 6 Amp Synchronous Switcher
General Description
The EL7556BC is an adjustable synchronous DC:DC switching regu-
lator optimized for a 5V input and 1.0V-3.8V output. By combining
integrated NMOS power FETS with a fused-lead package, the
EL7556BC can supply up to 6A continuous output current without the
use of external power devices or discrete heat sinks, thereby minimiz-
ing design effort and overall system cost.
On-chip resistorless current sensing is used to achieve stable, highly
efficient, current-mode control. The EL7556BC 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 on-board sensor moni-
tors 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 EL7556BC is available in a 28-pin SO package and is specified
for operation over the full -40°C to +85°C temperature range.
Connection Diagram
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
V
IN
660µF
C9
5.1
R5
Manufactured under U.S. Patents No. 5,723,974 and No. 5,793,126
C4
1µF
C3
0.1µF
Connect to VSSP for
external feedback
C7
100
R4
C12
1µF
39pF
C8
220pF
10
11
12
13
14
1
2
3
4
5
6
7
8
9
VCC2DET
EL7556BC
FB1
CREF
CSLOPE
COSC
VDD
VIN
VSSP
VIN
VSSP
VSSP
VSSP
VSSP
OUTEN
150
R3
PWRGD
VSSP
VSSP
TEST
C2V
VSS
FB2
VHI
CP
OT
LX
LX
LX
LX
28
27
26
25
24
23
22
21
20
19
18
17
16
15
20
R1
0.1µF
L1
C 6
2.5µH
39.2
C 5
1µF
R6
1mF
C10
D1
D3
D2
V
IN
0.22µF
C11
(Optional)
D4*
V
1V*(1+R3/R4)
OUT =

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EL7556BCM Summary of contents

Page 1

... Outline # EL7556BCM 28-Pin SO - MDP0027 EL7556BCM-T13 28-Pin SO 13” MDP0027 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. © ...

Page 2

EL7556BC Integrated Adjustable 6 Amp Synchronous Switcher Absolute Maximum Ratings Storage Temperature Range Supply ( Ambient Operating Temperature Important Note: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all ...

Page 3

Electrical Characteristics 5V 1nF 470pF OSC SLOPE Parameter Description Controller - Doubler V Voltage Doubler Output C2V Controller - Oscillator F Oscillator Ramp Amplitude RAMP I Oscillator Charge Current ...

Page 4

EL7556BC Integrated Adjustable 6 Amp Synchronous Switcher Typical Performance Curves Efficiency =3.5V) LOAD OUT V =V =5.0V (±10 =4. = =5. ...

Page 5

Typical Performance Curves Line Regulation vs C SLOPE V =V =5.0V ±10 0.8 0.7 0.6 0.5 I =6A OUT 0.4 0.3 0.2 I =0.5A OUT 0.1 0 100 125 C (pF) SLOPE OUT ...

Page 6

EL7556BC Integrated Adjustable 6 Amp Synchronous Switcher Typical Performance Curves I I OSC 60 T =25°C A OUTEN =5. =4. Discontinuous Mode Continuous ...

Page 7

Typical Performance Curves vs Cu Area Board with no Components Board with Inductor 27 25 0.00 1.00 2.00 3.00 4.00 2 Bare Cu Area ( Temperature DSON 38 36 ...

Page 8

EL7556BC Integrated Adjustable 6 Amp Synchronous Switcher Pin Descriptions I = Input Output Supply Pin Number Pin Name Pin Type 1 FB1 I Voltage feedback pin for the buck regulator. Active when VCC2DET is logic low. ...

Page 9

Block Diagram Integrated Adjustable 6 Amp Synchronous Switcher 9 EL7556BC ...

Page 10

EL7556BC Integrated Adjustable 6 Amp Synchronous Switcher Applications Information Circuit Description General The EL7556BC is a fixed frequency, current mode con- trolled DC:DC converter with integrated N-channel power MOSFETS and a high precision reference. The device incorporates all of the ...

Page 11

If I LMAX has not been reached, the regulator output voltage is then compared to the reference voltage VREF. The resultant error voltage is summed with the current feedback and slope compensation ramp. The ...

Page 12

EL7556BC Integrated Adjustable 6 Amp Synchronous Switcher exceeds the thermal trip-point, the OT pin will output a logic 0. The upper and lower trip points are set to 135 ºC and 100ºC respectively. To enable thermal shutdown this pin should ...

Page 13

EL7556BC Integrated Adjustable 6 Amp Synchronous Switcher General Disclaimer Specifications contained in this data sheet are in effect as of the publication date shown. Elantec, Inc. reserves the right to make changes in the cir- cuitry or specifications contained herein ...

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