EL7564 Datasheet, PDF (1/17 Pages) Intersil Corporation – Monolithic 4 Amp DC/DC Step-Down Regulator

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May 9, 2005
EL7564
FN7297.3
Monolithic 4 Amp DC/DC Step-Down
Regulator
The EL7564 is an integrated, full-featured synchronous step-
down regulator with output voltage adjustable from 1.0V to
3.8V. It is capable of delivering 4A continuous current at up
to 95% efficiency. The EL7564 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 EL7564
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 EL7564 ideal for desktop and
portable applications.
The EL7564 is specified for operation over the -40°C to
+85°C temperature range.
Typical Application Diagrams
EL7564
[20-PIN SO (0.300”)]
TOP VIEW
C5
0.1µF
1 _VREF
EN 20
C4
390pF
2 SGND FB 19
R4
3 COSC PG 18
22Ω ^C3 _{4 VDD VDRV 17}
0.22µF
5 VTJ
VHI 16
C2
2.2nF
6 PGND
LX 15
C6
D1
0.22µF
L1
V_OUT
3.3V, 4A
V_IN
5V
C1
330µF
7 PGND
LX 14
8 VIN PGND 13
4.7µH
C7
330µF
R2
C10
2.37kΩ _100pF
9 STP PGND 12
R1
10 STN PGND 11
1kΩ
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
• Pb-Free available (RoHS compliant)
Applications
• DSP, CPU core and IO 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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