EL7564C Datasheet, PDF (1/18 Pages) Elantec Semiconductor – Monolithic 4 Amp DC:DC Step-down Regulator

EL7564C
Monolithic 4 Amp DC:DC Step-down Regulator
Features
• 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
• 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
Applications
• DSP, CPU Core and IO Supplies
• Logic/Bus Supplies
• Portable Equipment
• DC:DC Converter Modules
• GTL + Bus Power Supply
Ordering Information
Part No
EL7564CM
EL7564CM-T13
EL7564CRE
EL7564CRE-T7
EL7464CRE-T13
Package
20-Pin SO
20-Pin SO
28-Pin HTSSOP
28-Pin HTSSOP
28-Pin HTSSOP
Tape &
Reel
-
13”
-
7”
13”
Outline #
MDP0027
MDP0027
MDP0048
MDP0048
MDP0048
General Description
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.
Typical Application Diagrams
C5
0.1µF
1 VREF
EN 20
C4
390pF
2 SGND
FB 19
R4
3 COSC
22Ω
C3
0.22µF
4
VDD
PG 18
VDRV 17
5 VTJ
VHI 16
C2
2.2nF
6 PGND
LX 15
VIN
C1
7 PGND
LX 14
5V
330µF
8 VIN
PGND 13
9 STP
PGND 12
10 STN
PGND 11
EL7564CM
(20-Pin SO)
Typical Application Diagrams continued on page 3
Manufactured Under U.S. Patent No. 5,7323,974
C6
0.22µF
L1
4.7µH
D1
C7
R2
330µF 2.37k
VOUT
3.3V,
4A
C10
2.2nF
R1
1kΩ
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.