EL7563C
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
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)
C5
1 CREF
0.1µF
2 SGND
C4
3 COSC
R4
22Ω
C3
0.22µF
390pF
4 VS
C2
5 PSHR
2.2nF
6 PGND
V
IN
3.3V
C1
330µF
7 PGND
8 VIN
9 STP
LX 15
LX 14
PGNDP 13
PGND 12
PGND 11
VHI 16
C6
0.22µF
L1
4.7µH
C10
2.2nF
C7
330µF
D1
VDRV 17
D3
C9
0.1µF
V
OUT
R2
1.54kΩ
R1
1kΩ
2.5V
4A
PG 18
D2
D4
C8
0.22µF
FB 19
EN 20
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
10 STN
October 5, 2001
EL7563CM
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.
ELANTEC [ ELANTEC SEMICONDUCTOR ]
