EL7563C
Monolithic 4 Amp DC:DC Step-down Regulator
Features
General Description
• 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
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.
• 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
Typical Application Diagram (EL7563CM)
C5
1
2
3
4
5
6
7
8
9
CREF
SGND
COSC
VS
EN 20
FB 19
0.1µF
C4
• 20-pin SO (0.300”) package
• 28-pin HTSSOP package
PG 18
D2
D4
390pF
C2
R4
VDRV 17
VHI 16
Applications
C3
C8
22W
0.22µF
D3
0.22µF
PSHR
PGND
PGND
VIN
• DSP, CPU Core, and I/O Supplies
• Logic/Bus supplies
• Portable equipment
• DC:DC converter modules
• GTL + Bus power supply
2.2nF
D1
C7
C6
C9
LX 15
0.22µF
0.1µF
C1
V
OUT
LX 14
L1
330µF
V
3.3V
IN
2.5V
4A
C10
4.7µH
PGNDP 13
PGND 12
PGND 11
2.2nF R2
1.54kW
R1
STP
330µF
1kW
10 STN
Ordering Information
Tape &
Reel
EL7563CM
Part No
Package
Outline #
MDP0027
MDP0027
MDP0048
MDP0048
EL7563CM
20-Pin SO (0.300”)
20-Pin SO (0.300”)
28-Pin HTSSOP
28-Pin HTSSOP
-
EL7563CM-T13
EL7563CRE-T7
EL7563CRE-T13
13”
7”
13”
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.