EL7563
®
Data Sheet
May 13, 2005
FN7296.2
Monolithic 4 Amp DC/DC Step-Down
Regulator
Features
• Integrated synchronous MOSFETs and current mode
controller
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.
• 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
The EL7563 is offered in 20-pin SO and 28-pin HTSSOP
packages.
• Over-voltage protection
• Junction temperature indicator
• Over-temperature protection
• Under-voltage lockout
Pinout
EL7563
(20-PIN SO)
TOP VIEW
• Multiple supply start-up tracking
• Power-good indicator
C5
• 20-pin SO (0.300”) package
• 28-pin HTSSOP package
• Pb-Free available (RoHS compliant)
1
EN 20
FB 19
VREF
0.1µF
C4
2 SGND
3 COSC
4 VDD
5 VTJ
PG 18
D2
D4
C8
390pF
C2
R4
VDRV 17
VHI 16
Applications
• DSP, CPU core, and I/O supplies
C3
22Ω
0.22µF
D3
0.22µF
D1
2.2nF
C6
C9
6 PGND
7 PGND
8 VIN
LX 15
0.22µF
0.1µF
• Logic/Bus supplies
C1
V
OUT
2.5V
4A
LX 14
L1
V
330µF
IN
3.3V
• Portable equipment
C10
2.2nF
4.7µH
PGND 13
PGND 12
PGND 11
R2
• DC/DC converter modules
• GTL + Bus power supply
1.58kΩ
R1
9 STP
C7
330µF
1kΩ
10 STN
Typical Application Diagrams continued on page 3
Manufactured Under U.S. Patent No. 5,7323,974
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1
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