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PDF EL7563C Data sheet ( Hoja de datos )
| Número de pieza | EL7563C | |
| Descripción | Monolithic 4 Amp DC:DC Step-down Regulator | |
| Fabricantes | Elantec Semiconductor | |
| Logotipo |  |
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EL7563C
Monolithic 4 Amp DC:DC Step-down Regulator
Features
• Integrated synchronous MOSFETs
and current mode controller
• 4A continuous output current
• Up to 95% efficiency
• Internal patented current sense
• Cycle-by-cycle current limit
• 3V to 3.6V input voltage
• Adjustable output voltage 1V to
2.5V
• Precision reference
• ±0.5% load and line regulation
• Adjustable switching frequency to
1MHz
• Oscillator synchronization
possible
• Internal soft-start
• Over-voltage protection
• Junction temperature indicator
• Over-temperature protection
• Under-voltage lockout
• Multiple supply start-up tracking
• Power-good indicator
• 20-pin SO (0.300”) package
• 28-pin HTSSOP package
Applications
• DSP, CPU Core, and I/O Supplies
• Logic/Bus supplies
• Portable equipment
• DC:DC converter modules
• GTL + Bus power supply
Ordering Information
Part No
EL7563CM
EL7563CM-T13
EL7563CRE-T7
EL7563CRE-T13
Package
20-Pin SO (0.300”)
20-Pin SO (0.300”)
28-Pin HTSSOP
28-Pin HTSSOP
Tape &
Reel
-
13”
7”
13”
Outline #
MDP0027
MDP0027
MDP0048
MDP0048
General Description
The EL7563C is an integrated, full-featured synchronous step-down
regulator with output voltage adjustable from 1.0V to 2.5V. It is capa-
ble of delivering 4A continuous current at up to 95% efficiency. The
EL7563C operates at a constant frequency pulse width modulation
(PWM) mode, making external synchronization possible. Patented on-
chip resistorless current sensing enables current mode control, which
provides cycle-by-cycle current limiting, over-current protection, and
excellent step load response. The EL7563C features power tracking,
which makes the start-up sequencing of multiple converters possible.
A junction temperature indicator conveniently monitors the silicon die
temperature, saving the designer time on the tedious thermal charac-
terization. The minimal external components and full functionality
make this EL7563C ideal for desktop and portable applications.
The EL7563C is specified for operation over the full -40°C to +85°C
temperature range.
Typical Application Diagram (EL7563CM)
R4
22Ω C3
0.22µF
C1
VIN 330µF
3.3V
C5
1 CREF
0.1µF
2 SGND
C4
3 COSC
390pF
4 VS
C2
5 PSHR
2.2nF
6 PGND
EN 20
FB 19
PG 18
VDRV 17
VHI 16
LX 15
7 PGND
LX 14
8 VIN
PGNDP 13
9 STP
PGND 12
10 STN
PGND 11
EL7563CM
D2 D4
C6
0.22µF
L1
4.7µH
D3
D1 C9
0.1µF
C10
2.2nF
C7
330µF
C8
0.22µF
VOUT
2.5V
4A
R2
1.54kΩ
R1
1kΩ
Typical Application Diagrams continued on page 3
Manufactured Under U.S. Patent No. 5,7323,974
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.
1 page  
EL7563C
Monolithic 4 Amp DC:DC Step-down Regulator
Typical Performance Curves (20-Pin SO Package)
*Note: The 28-Pin HTSSOP Package Offers Improved Performance
*Efficiency vs IO
VIN=3.3V
100
95
VO=2.5V
VO=1.8V
90
85
80
VO=1.2V
75
VO=1V
70
65
Measured with SO20 package
60
0 0.5 1 1.5 2 2.5 3 3.5 4
Load Current IO (A)
*Converter Total Power Loss vs IO
VIN=3.3V
1.8
1.6 Measured with SO20 package
VO=1.8V
1.4
1.2 VO=1.2V
1
0.8 VO=1V
0.6
0.4 VO=2.5V
0.2
0
0 0.5 1 1.5 2 2.5 3 3.5 4
Output Current IO (A)
Line Regulation
VO=3.5V
2.505
2.5
2.495
IO=0.5A
2.49
2.485
IO=2A
2.48
2.475
2.47
IO=4A
2.465
3
3.1 3.2 3.3 3.4 3.5 3.6
VIN (V)
*Efficiency vs IO
VO=2.5V
100
95
VIN=3V
90
VIN=3.3V
85
80
VIN=3.6V
75
70
65
Measured with SO20 package
60
0 0.5 1 1.5 2 2.5 3 3.5 4
Load Current IO (A)
Load Regulation
VO=2.5V
2.505
2.5
VIN=3.6V
2.495
2.49
VIN=3.3V
2.485
2.48
VIN=3V
2.475
2.47
2.465
0.5 1 1.5 2 2.5 3 3.5
Load Current IO (A)
4
VREF vs Junction Temperature
1.27
1.268
1.266
1.264
1.262
1.26
1.258
1.256
-50
-10 30 70 110
Junction Temperature (°C)
150
5
5 Page 
EL7563C
Monolithic 4 Amp DC:DC Step-down Regulator
junction temperature TJ (°C) can be deducted from the
following relation:
TJ = 75 + 1---0-.-2-.-0---–0---3-V--8--T-4---J-
Where VTJ is the voltage at VTJ pin in volts.
Power Good and Power On Reset
During power up the output regulator will be disabled
until VIN reaches a value of approximately 2.9V. About
300mV hysteresis is present to eliminate noise-induced
oscillations.
Under-voltage and over-voltage conditions on the regu-
lator output are detected through an internal window
comparator. A logic high on the PG output indicates that
the regulated output voltage is within about +10% of the
nominal selected output voltage.
Power Tracking
The power tracking pins STP and STN are the inputs to
a comparator, whose HI output forces the PWM control-
ler to skip switching cycle.
1. Linear Tracking
In this application, it is always the case that the lower
voltage supply VC tracks the higher output supply VP.
Please see Figure 2 below.
1 20
2 19
6 15
7
EL7563C
14
8 13
9+
10 -
12
11
VC
VOUT
1 20
2 19
6 15
7
EL7563C
14
8 13
9+
10 -
12
11
VP
TIME
Figure 2. Linear Power Tracking
11
VP
VC
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet EL7563C.PDF ] | |
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