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EL7563
Monolithic 4 Amp DC/DC Step-Down
Regulator
The EL7563 is an integrated, full-featured synchronous step-
down regulator with output voltage adjustable from 1.0V to
2.5V. It is capable of delivering 4A continuous current at up
to 95% efficiency. The EL7563 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 EL7563
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 characterization. The minimal external components
and full functionality make this EL7563 ideal for desktop and
portable applications.
The EL7563 is offered in 20-pin SO and 28-pin HTSSOP
packages.
Pinout
EL7563
(20-PIN SO)
TOP VIEW
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
Pb-Free available (RoHS compliant)
Applications
DSP, CPU core, and I/O supplies
Logic/Bus supplies
Portable equipment
DC/DC converter modules
GTL + Bus power supply
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
20
19
18
17
VREF
SGND
COSC
VDD
VTJ
PGND
PGND
VIN
STP
STN
EN
FB
PG
VDRV
VHI
LX
LX
PGND
PGND
PGND
0.1μF
390pF
2.2nF
0.22μF
330μF
22
0.22μF
4.7μH
330μF
1.58k
R1
1k
V
IN
3.3V
V
OUT
0.1μF
0.22μF
2.2nF
2.5V
4A
C5
C4
C2
C3
R4
C1
C7
R2
C10
L1
C6
C9
D1
D3
D4
C8
D2
Data Sheet
May 13, 2005
FN7296.2
NOT RECOMMENDED FOR NEW DESIGNS
SEE EL7554
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-352-6832
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2003, 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.