EL7563 Datasheet, PDF (1/16 Pages) Intersil Corporation – Monolithic 4 Amp DC:DC Step-Down Regulator

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May 13, 2005
EL7563
FN7296.2
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
R4
22Ω ^C3
0.22µF
C1
V_{IN 330µF}
3.3V
C5
1 VREF
0.1µF
2 SGND
C4
3 COSC
390pF
4 VDD
C2
5 VTJ
2.2nF
6 PGND
EN 20
FB 19
PG 18
VDRV 17
VHI 16
LX 15
7 PGND LX 14
8 VIN PGND 13
9 STP PGND 12
10 STN PGND 11
D2 D4
C8
D3
D1
0.22µF
C6
0.22µF
C9
0.1µF
L1
V_OUT
4.7µH
C10
2.2nF
2.5V
4A
R2
1.58kΩ
C7
330µF
R1
1kΩ
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
Typical Application Diagrams continued on page 3
Manufactured Under U.S. Patent No. 5,7323,974
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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