EL7563C Datasheet, PDF (1/18 Pages) Elantec Semiconductor – Monolithic 4 Amp DC:DC Step-down Regulator

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.