EL7564 데이터 시트보기 (PDF) - Renesas Electronics

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EL7564

Monolithic 4 Amp DC/DC Step-Down Regulator

Renesas Electronics 

EL7564

NOT RECOMMENDED FOR NEW DESIGNS

RECOMMENDED REPLACEMENT PART

ISL8024

Monolithic 4 Amp DC/DC Step-Down Regulator

DATASHEET

FN7297

Rev 3.00

May 9, 2005

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

22

C3

0.22µF

4

VDD

VDRV 17

5 VTJ

VHI 16

C2

2.2nF

6 PGND

LX 15

C6

D1

0.22µF

L1

VOUT

3.3V, 4A

VIN

5V

C1

330µF

7 PGND

LX 14

8 VIN PGND 13

4.7µH

C7

330µF

R2

C10

2.37k 100pF

9 STP PGND 12

R1

10 STN PGND 11

1k

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

FN7297 Rev 3.00

May 9, 2005

Page 1 of 17

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