© 2007 Semtech Corp.

SC4509

www.semtech.com

PRELIMINARY

POWER MANAGEMENT

2

Absolute Maximum Rating

Electrical Characteristics

Parameter

Symbol

Maximum

Units

Input Supply Voltage

V

IN

-0.3 to 20

V

SW Voltage

V

SW

-0.3 to 30

V

Maximum Output Voltage

V

OUT

30

V

Feedback Voltage

V

FB

-0.3 to 20

V

EN/SS Voltage

V

EN/SS

-0.3 to V

V

Maximum Junction Temperature

T

J

125

°C

Storage Temperature Range

T

STG

-65 to +150

°C

Thermal Impedance

MLPD-W8

θ

JA

78

C/W

SOT23-6

165

Lead Temperature (Soldering), 10s (SOT23-6 package only)

T

LEAD

300

°C

Peak IR Flow Temperature, (10-40sec)

T

PKG

260

°C

V

ESD

2kV

Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the

Electrical Characteristics section is not implied. Exposure to Absolute Maximum rated conditions for extended periods of time may affect device reliability.

Unless specified: V

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Input Voltage

V

IN

2.7

10

V

Quiescent Current

I

Q

No switching

2.6

3.3

mA

Feedback Voltage

V

FB

182

199

216

mV

Feedback Pin Bias Current

I

QFB

35

100

nA

Switching Frequency

f

OSC

T

1.0

1.2

1.4

MHz

Maximum Output Voltage

V

OUT

20

V

Switch Saturation Voltage

V

CESAT

I

160

300

mV

Maximum Duty Cycle

D

MAX

V

90

%

Switch Current Limit

I

cl

I

300

500

700

mA

Switch Leakage Current

I

LKG

V

0.01

5.0

μA

Shutdown Current

I

SHD

V

3

5

μA

f

DIM

1

10

kHz

EN/SS Threshold Low

V

IL

50

mV

EN/SS Threshold High

V

IH

1.8

V

Note:

1) Calculated from package in still air, mounted to 3”x 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.

2) Tested in accordance to JEDEC standard JESD22-A114B.