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PDF EL7564C Data sheet ( Hoja de datos )
| Número de pieza | EL7564C | |
| Descripción | Monolithic 4 Amp DC:DC Step-down Regulator | |
| Fabricantes | Elantec Semiconductor | |
| Logotipo |  |
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EL7564C
Monolithic 4 Amp DC:DC Step-down Regulator
Features
• Integrated synchronous MOSFETs
and current mode controller
• 4A continuous output current
• Up to 95% efficiency
• 4.5V to 5.5V input voltage
• Adjustable output from 1V to 3.8V
• Cycle-by-cycle current limit
• 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 IO Supplies
• Logic/Bus Supplies
• Portable Equipment
• DC:DC Converter Modules
• GTL + Bus Power Supply
Ordering Information
Part No
EL7564CM
EL7564CM-T13
EL7564CRE
EL7564CRE-T7
EL7464CRE-T13
Package
20-Pin SO
20-Pin SO
28-Pin HTSSOP
28-Pin HTSSOP
28-Pin HTSSOP
Tape &
Reel
-
13”
-
7”
13”
Outline #
MDP0027
MDP0027
MDP0048
MDP0048
MDP0048
General Description
The EL7564C is an integrated, full-featured synchronous step-down
regulator with output voltage adjustable from 1.0V to 3.8V. It is capa-
ble of delivering 4A continuous current at up to 95% efficiency. The
EL7564C 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 EL7564C 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 EL7564C ideal for desktop and portable applications.
The EL7564C is specified for operation over the -40°C to +85°C tem-
perature range.
Typical Application Diagrams
C5
0.1µF
1 VREF
EN 20
C4
390pF
2 SGND
FB 19
R4 3 COSC
22Ω
C3
0.22µF
4
VDD
PG 18
VDRV 17
5 VTJ
VHI 16
C2
2.2nF
6 PGND
LX 15
VIN
C1 7 PGND
LX 14
5V
330µF
8 VIN
PGND 13
9 STP
PGND 12
10 STN
PGND 11
EL7564CM
(20-Pin SO)
Typical Application Diagrams continued on page 3
Manufactured Under U.S. Patent No. 5,7323,974
C6
0.22µF
L1
4.7µH
D1
C7 R2
330µF 2.37k
VOUT
3.3V,
4A
C10
2.2nF
R1
1kΩ
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  
EL7564C
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=5V)
100
95
90
85
VO=2.8V
80
VO=1.8V
75
70
65
600 0.5 1 1.5 2 2.5
Load Current IO (A)
VO=3.3V
3 3.5
4
*Power Loss vs IO (VIN=5V)
2
1.6
1.2
0.8
VO=3.3V
VO=2.8V
VO=1.8V
0.4
0
0 0.5 1 1.5 2 2.5 3 3.5 4
Output Current IO (A)
Line Regulation (VO=3.3V)
3.325
3.315
3.305
3.295
3.285
3.275
4.5
IO=0.5A
IO=2A
IO=4A
4.75
5
VIN (V)
5.25
5.5
*Efficiency vs IO (VO=3.3V)
100
VIN=4.5V
95
90 VIN=5V
85 VIN=5.5V
80
75
70
65
600 0.5 1 1.5 2 2.5 3 3.5 4
Load Current IO (A)
Load Regulations (VO=3.3V)
3.325
3.315
VIN=5.5V
3.305
3.295
VIN=5V
3.285
VIN=4.5V
3.2750.5 1 1.5 2 2.5 3 3.5 4
Load Current IO (A)
VREF vs Die Temperature
1.27
1.268
1.266
1.264
1.262
1.26
1.258
1.256
-50
-10 30 70
Die Temperature (°C)
110
150
5
5 Page 
EL7564C
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 4V. About
500mV 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
EL7564C
14
8 13
9+
10 -
12
11
VC
VOUT
1 20
2 19
6 15
7
EL7564C
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 EL7564C.PDF ] | |
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