SC440A

3

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© 2010 Semtech Corp.

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-

(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 according to JEDEC standard JESD22-A114-B.

Electrical Characteristics

Unless otherwise noted, V

IN

= 12V, -40°C < T

A

= T

J

< 85°C, R

IOSET

= 2kΩ.

Absolute Maximum Ratings

V

IN

Pin: Supply Voltage …………………………… -0.3 to 30V

Maximum Output Power………………………………

7.5W

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

SW, VOUT, IO1~IO6, OVPIN,

OVPRTN Voltage …………………………………

-0.3 to 45V

SS, COMP Voltage …………………………………… -0.3 to 3V

SCP_EN Voltage …………………………………… -0.3 to 3.5V

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

IN

+0.3V

PGND to AGND and I

OGND

……………………………

± 0.3V

Peak IR Reflow Temperature ………………………….

260°C

Recommended Operating Conditions

Supply Input Voltage …………………………… 4.5V to 27V

Maximum Output Voltage …………………………

42V

Maximum LED Current ………………………………

30mA

Thermal Information

Maximum Junction Temperature……………………… 150°C

Storage Temperature ………………………… -65 to +150°C

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Input Supply

Under-Voltage Lockout Threshold

U

VLO-TH

V

IN

rising

4.2

4.5

V

UVLO Hysteresis

U

VLO-H

250

mV

V

IN

Quiescent Supply Current

I

IN-Q

No switching

4.5

mA

V

IN

Supply Current in Shutdown

I

IN-S

EN / PWM = low

1

μA

Oscillator

F

S

0.64

0.8

0.96

MHz

D

MAX

90

%

D

MIN

0%

Minimum On-Time

T

ON-MIN

200

ns

Minimum Off-Time

T

ON-MIN

100

ns

Internal Power Switcher

Switch Current Limit

I

SW

2.0

2.5

A

Switch Saturation Voltage

V

SAT

I

SW

= 1A

200

500

mV

Switch Leakage Current

I

S-LEAK

V

SW

= 12V

0.01

1

μA

Compensation

Sourcing Current

I

O-H

V

COMP

= 0.5V

7.3

μA

Sinking Current

I

O-L

V

COMP

= 2V

5.5

μA