SC441A

3

© 2009 Semtech Corporation

www.semtech.com

Recommended Operating Conditions

Absolute Maximum Ratings

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

specified in the Electrical Characteristics section is not recommended.

NOTES-

() Calculated from package in still air, mounted to 3” x 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad per JESD5 standards.

(2) Tested according to JEDEC standard JESD22-A4-B.

Electrical Characteristics

Thermal Information

V

Maximum Output Power ………………………………

22W

SW, OVPIN, OVPRTN, VOUT, IO~IO4 Voltage …… -0.3 to 40V

IOSET Voltage ……………………………………… -0.3 to 2V

SS, COMP Voltage ………………………………… -0.3 to 4V

EN, PWM, FFLAG Voltage …………………… -0.3 to V

PGND to AGND ………………………………………

± 0.3V

Peak IR Reflow Temperature …………………………… 260°C

2.5kV

Input Voltage Range ……………………………… 4.5V~2V

Output Voltage …………………………………… Up to 36V

LED Current …………………………………… Up to 50mA

Maximum Junction Temperature ……………………… 50°C

Storage Temperature ………………………… -65 to +50°C

Lead Temperature (Soldering) 0 sec ………………… 260°C

Unless otherwise specified: V

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Input Supply

Under-Voltage Lockout Threshold

UVLO-TH

V

4.3

4.45

V

UVLO Hysteresis

UVLO-H

250

mV

V

I

IN_Q

No switching

3

mA

V

I

IN_S

EN / PWM = low



µA

Oscillator

Switching Frequency

F

S

0.56

0.7

0.84

MHz

Internal Power Switcher

Switch Current Limit

I

SW

2.5

3.32

A

Switch Saturation Voltage

V

SAT

I

200

350

mV

Switch Leakage Current

I

S_LEAK

0.



µA

Maximum Duty Cycle

D

MAX

88

93

%

Minimum Duty Cycle

D

MIN

0

%

T

ON_MIN

00

ns

Compensation

Sourcing Current

I

EA_SOURCE

V

5

µA

Sinking Current

I

EA_SINK

V

6

µA