庐
N
D FO
NDE L7554
M M E EE E
EC O
S
Data Sheet
OT R
W
R NE
IG
D ES
NS
EL7563
May 13, 2005
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.
Features
鈥?Integrated synchronous MOSFETs and current mode
controller
鈥?4A continuous output current
鈥?Up to 95% efficiency
鈥?Internal patented current sense
鈥?Cycle-by-cycle current limit
鈥?3V to 3.6V input voltage
鈥?Adjustable output voltage 1V to 2.5V
鈥?Precision reference
鈥?卤0.5% load and line regulation
鈥?Adjustable switching frequency to 1MHz
鈥?Oscillator synchronization possible
鈥?Internal soft-start
鈥?Over-voltage protection
鈥?Junction temperature indicator
鈥?Over-temperature protection
Pinout
EL7563
(20-PIN SO)
TOP VIEW
鈥?Under-voltage lockout
鈥?Multiple supply start-up tracking
鈥?Power-good indicator
C5
1 VREF
0.1碌F
C4
3 COSC
R4
C3
22鈩?/div>
0.22碌F
390pF
C2
2.2nF
6 PGND
V
IN
3.3V
C1
330碌F
7 PGND
8 VIN
9 STP
10 STN
LX 15
LX 14
PGND 13
PGND 12
PGND 11
C7
330碌F
4 VDD
5 VTJ
VDRV 17
VHI 16
C6
0.22碌F
L1
4.7碌H
C10
2.2nF
D1
D3
C9
0.1碌F
V
OUT
R2
1.58k鈩?/div>
R1
1k鈩?/div>
2.5V
4A
PG 18
D2
D4
C8
0.22碌F
2 SGND
EN 20
FB 19
鈥?20-pin SO (0.300鈥? package
鈥?28-pin HTSSOP package
鈥?Pb-Free available (RoHS compliant)
Applications
鈥?DSP, CPU core, and I/O supplies
鈥?Logic/Bus supplies
鈥?Portable equipment
鈥?DC/DC converter modules
鈥?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.
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.
next