ILC6377SO33 데이터 시트보기 (PDF) - Fairchild Semiconductor

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ILC6377SO33

0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown

Fairchild Semiconductor 

ILC6376/77

Electrical Characteristics ILC6376/77SO50

Unless

uration

Otherwise

figure 1.

specified

all

limits

are

at

VOUT

=

5.0V,

VIN

=

6V,

FOSC=300kHz,

IOUT

=

200mA,

TA

=

25°C.

Circuit

config-

Parameter

Output Voltage

Input Voltage

Output Maximum Current

Input Supply Current

Shutdown Current

LX Switch On-Resistance

LX Switch Leakage Current

Oscillator Frequency

Max Duty Cycle

PFM Duty Cycle

Efficiency

Undervoltage Lockout

Soft-Start Time

Shutdown Input Voltage

EXT1, EXT2 Hi On-

Resistance

EXT1, EXT2 Low On-

Resistance

Symbol

VOUT

VIN

IOUT(MAX)

IIN

IS/D

Rds(on)

ILXL

FOSC

MAXDTY

PFMDTY

EFFI

VUVLO

TSS

VS/D

REXtHI

REXtLOW

Conditions

VIN 5.25V, No Load

ILC6376

ILC6377

VS/D = 0V

Open Loop Measurement, VS/D = VIN,

VLX =VIN - 0.2V, VOUT = 4.5V

Open Loop Measurement, VOUT =

VIN, VLX = 0V

Measure Waveform at EXT pin VIN =

5.3V

IOUT = 20mA

No Load (ILC6377)

Minimum VIN when VREF does not

start up

VREF rises to 0V from 0.9V

High = Regulator “ON”

Low = Regulator “OFF”

Open Loop Measurement

Open Loop Measurement

Min. Typ.

4.875 5.000

500 600

2540

71

1.5

0.44

255 300

100

15 25

95

0.9

6.0 10.0

0.65

24

20

Max.

5.125

10

3740

110

2.5

0.58

Units

V

V

mA

µA

µA

Ω

2.0 µA

345 kHz

%

35

%

%

1.8

V

16 msec

V

0.2

32

Ω

26

Ω

©2001 Fairchild Semiconductor Corporation

4

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