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EL7562C Schematic ( PDF Datasheet ) - Elantec Semiconductor

Teilenummer EL7562C
Beschreibung Monolithic 2 Amp DC:DC Step-down Regulator
Hersteller Elantec Semiconductor
Logo Elantec Semiconductor Logo 




Gesamt 10 Seiten
EL7562C Datasheet, Funktion
EL7562C - Preliminary
Monolithic 2 Amp DC:DC Step-down Regulator
Features
• Integrated synchronous MOSFETs
and current mode controller
• 2A 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 temperature protection
• Under voltage lockout
• 16-pin QSOP 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
EL7562CU
Package Tape & Reel
16-Pin QSOP
-
Outline #
MDP0040
General Description
The EL7562C is an integrated, synchronous step-down regulator with
output voltage adjustable from 1.0V to 3.8V. It is capable of delivering
2A continuous current at up to 95% efficiency. The EL7562C operates
at a constant frequency pulse width modulation (PWM) mode, making
external synchronization possible. Patented on-chip resistorless cur-
rent sensing enables current mode control, which provides cycle-by-
cycle current limiting, over-current protection, and excellent step load
response. The EL7562C is available in a fused-lead 16-pin QSOP
package. With proper external components, the whole converter fits
into a less than 0.5 in2 area. The minimal external components and
small size make this EL7562C ideal for desktop and portable
applications.
The EL7562C is specified for operation over the -40°C to +85°C tem-
perature range.
Typical Application Diagram
C3 C4
0.1µF 270pF
R3
39
C1 C2
100µF 0.1µF
VIN
(4.5V-
5.5V)
1 SGND
2 COSC
3 VDD
4 PGND
5 PGND
6 VIN
7 VIN
8 EN
PGND 16
VREF 15
FB 14
VDRV 13
LX 12
LX 11
VHI 10
PGND 9
C5
0.1µF
R2
R1 2.37k
1k
L1
C6 4.7µF
0.1µF
C7
VO
(3.3V,
100µF 2A)
Manufactured under U.S. Patent No. 57,323,974
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.






EL7562C Datasheet, Funktion
EL7562C - Preliminary
Monolithic 2 Amp DC:DC Step-down Regulator
Block Diagram
0.1µF
270pF
Junction
Temperature
VREF
Voltage
Reference
Controlle
r Supply
39VDD
0.1µF
PWM
Controller
EN
SGND
FB
Current
Sense
COSC
Oscillator
Drivers
Power
FET
Power
FET
VDRV
VHI
VIN
0.1µF
4.7µH
PGND
100µF
2370
VOUT
1k
6

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