
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.
E
L
75
63
C
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)
Manufactured Under U.S. Patent No. 5,7323,974
Typical Application Diagrams continued on page 3
1
2
3
4
16
15
14
13
5
6
7
12
11
9
8
10
EL7563CM
20
19
18
17
CREF
SGND
COSC
VS
PSHR
PGND
VIN
STP
STN
EN
FB
PG
VDRV
VHI
LX
PGNDP
PGND
0.1F
390pF
2.2nF
0.22F
330F
22
0.22F
4.7H
330F
1.54k
1k
VIN
3.3V
VOUT
0.1F
0.22F
2.2nF
2.5V
4A
C5
C4
C2
C3
R4
C1
C7
R1
R2
C10
L1
C6
C9
D1
D3
D4
C8
D2
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
Package
Tape &
Reel
Outline #
EL7563CM
20-Pin SO (0.300”)
-
MDP0027
EL7563CM-T13
20-Pin SO (0.300”)
13”
MDP0027
EL7563CRE-T7
28-Pin HTSSOP
7”
MDP0048
EL7563CRE-T13
28-Pin HTSSOP
13”
MDP0048
EL7563C
Monolithic 4 Amp DC:DC Step-down Regulator
O
ct
ob
er
5,
20
01