SC46166

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:1.2

2008.07.04

Http://www.silan.com.cn

Page 3 of 11

Characteristics

Symbol

Test condition

Min.

Typ.

Max.

Unit

Power Saving Mode Current

Threshold

L=4.7

μH

--

7.5

--

mA

Line Regulation

V

--

2

10

mV/V

Load Regulation

V

--

0.1

1

mV/mA

Switching Frequency

Fs

--

450

500

550

KHz

Max Duty Cycle

FB=1.2V

90

95

--

%

NMOS Switch On Resistance

--

0.4

0.5

Ω

NMOS Switch Leakage

--

0.1

1

μA

NMOS Current Limit

0.75

1

1.25

A

EN Input High

--

1

--

--

V

EN Input Low

--

--

--

0.35

V

Thermal Shutdown Temperature

--

--

150

--

°C

Thermal Shutdown Hysterises

--

--

20

--

°C

PIN CONFIGURATION

PIN DESCRIPTION

Pin No.

SC46166

SC46166S

Pin Name

I/O

Pin Description

1

1

EN

I

Chip Enable (Active High)

2

—

NC

—

Not connect

3

5

GND

G

Ground

4

4

LX

I/O

5

2

P

Power Supply Pin of SC46166

6

3

FB

I

Feedback Input Pin

FUNCTION DESCRIPTION

The SC46166 is a 500kHz, asynchronous boost converter housed in a compact package, includes a voltage

reference, error amplifier, ramp generator, current comparator, slope compensation, current sense and driver.