EL7516IY 데이터 시트보기 (PDF) - Renesas Electronics

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EL7516IY

600kHz/1.2MHz PWM Step-Up Regulator

Renesas Electronics 

EL7516

Block Diagram

VDD

REFERENCE

GENERATOR

FSEL

OSCILLATOR

SHDN

SS

SHUTDOWN

AND START-UP

CONTROL

COMPARATOR

PWM LOGIC

CONTROLLER

CURRENT

SENSE

COMP

GM

AMPLIFIER

FET

DRIVER

LX

GND

FB

Pin Descriptions

PIN NUMBER

PIN NAME

1

COMP

2

FB

3

SHDN

4

GND

5

LX

6

VDD

7

FSEL

8

SS

DESCRIPTION

Compensation pin. Output of the internal error amplifier. Capacitor and resistor from COMP pin to ground.

Voltage feedback pin. Internal reference is 1.294V nominal. Connect a resistor divider from VOUT. VOUT =

1.294V (1 + R1/R2). See Typical Application Circuit.

Shutdown control pin. Pull SHDN low to turn off the device.

Analog and power ground.

Power switch pin. Connected to the drain of the internal power MOSFET.

Analog power supply input pin.

Frequency select pin. When FSEL is set low, switching frequency is set to 620kHz. When connected to

high or VDD, switching frequency is set to 1.25MHz.

Soft-start control pin. Connect a capacitor to control the converter start-up.

Typical Application Circuit

R3

3.9k

C5

4.7nF

R1 85.2k

R2

10k

1 COMP

2 FB

3 SHDN

SS 8

FSEL 7

VDD 6

4 GND

LX 5

S1

C3

27nF

C4 + C1

0.1µF 22µF

2.7V TO 5.5V

10µH

D1

+ C2

22µF

12V

FN7333 Rev 6.00

October 9, 2007

Page 3 of 12

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