EL7564C
Monolithic 4 Amp DC:DC Step-down Regulator
Features
General Description
• Integrated synchronous MOSFETs
and current mode controller
• 4A continuous output current
• Up to 95% efficiency
• 4.5V to 5.5V input voltage
• Adjustable output from 1V to 3.8V
• Cycle-by-cycle current limit
• Precision reference
• ±0.5% load and line regulation
• Adjustable switching frequency to
1MHz
• Oscillator synchronization
possible
The EL7564C is an integrated, full-featured synchronous step-down
regulator with output voltage adjustable from 1.0V to 3.8V. It is capa-
ble of delivering 4A continuous current at up to 95% efficiency. The
EL7564C 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 EL7564C 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 EL7564C ideal for desktop and portable applications.
The EL7564C is specified for operation over the -40°C to +85°C tem-
perature range.
• Internal soft start
• Over voltage protection
• Junction temperature indicator
• Over temperature protection
• Under voltage lockout
Typical Application Diagrams
• Multiple supply start-up tracking
• Power good indicator
C5
0.1µF
• 20-pin SO (0.300”) package
• 28-pin HTSSOP package
1
2
3
4
5
6
7
8
9
VREF
SGND
COSC
VDD
EN 20
FB 19
C4
Applications
390pF
PG 18
• DSP, CPU Core and IO Supplies
• Logic/Bus Supplies
• Portable Equipment
• DC:DC Converter Modules
• GTL + Bus Power Supply
R4
C3
22W
VDRV 17
VHI 16
0.22µF
C6
D1
C7
VTJ
0.22µF
V
3.3V,
4A
OUT
C2
PGND
PGND
VIN
LX 15
L1
2.2nF
4.7µH
LX 14
V
5V
C1
330µF
R2
C10
IN
330µF 2.37k
2.2nF
Ordering Information
PGND 13
PGND 12
PGND 11
Tape &
Reel
STP
Part No
EL7564CM
Package
20-Pin SO
Outline #
MDP0027
MDP0027
MDP0048
MDP0048
MDP0048
R1
-
1kW
10 STN
EL7564CM-T13
EL7564CRE
20-Pin SO
13”
-
28-Pin HTSSOP
28-Pin HTSSOP
EL7564CM
(20-Pin SO)
EL7564CRE-T7
7”
EL7464CRE-T13 28-Pin HTSSOP
13”
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.
ELANTEC [ ELANTEC SEMICONDUCTOR ]
