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SC443
Absolute Maximum Ratings
V IN Pin: Supply Voltage …………………………… -0.3 to 30V
Maximum Output Power ………………………………… 4W
FSET, IOSET Voltage ………………………………… -0.3 to 2V
SW, VOUT, IO1~IO3, OVPIN Voltage ……………… 0.3V to 45V
SS, COMP Voltage …………………………………… -0.3 to 3V
EN, PWM Voltage …………………………… -0.3 to V IN +0.3V
Recommended Operating Conditions
Supply Input Voltage ……………………………… 4.5 to 27V
Maximum Output Voltage…………………………………42V
Maximum LED Current ………………………………… 30mA
Thermal Information
Junction to Ambient (1) ……………………………… 38°C/W
PGND to AGND and IOGND…………………………
Peak IR Reflow Temperature ………………………….
ESD Protection Level (2) …………………………………
± 0.3V
260°C
2kV
Maximum Junction Temperature……………………… 150°C
Storage Temperature ………………………… -65 to +150°C
Lead Temperature (Soldering) 10 sec ………………… 260°C
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)
(2)
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.
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 = 4.02kΩ, R FSET =40.2 kΩ
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Input Supply
Under-Voltage Lockout Threshold
UVLO Hysteresis
U VLO-TH
U VLO-H
V IN rising
4.2
250
4.45
V
mV
V IN Quiescent Supply Current
V IN Supply Current in Shutdown
I IN-Q
I IN-S
No switching
EN / PWM = low
3
1
mA
μA
Oscillator
Switching Frequency (1)
Switching Frequency Range (1)
f S
f S
R FSET = 40.2 kΩ
0.64
200
0.8
0.96
1200
MHz
kHz
Maximum Duty Cycle (1)
Minimum Duty Cycle (1)
Minimum On-Time
D MAX
D MIN
T ON-MIN
90
200
0
%
%
ns
Internal Power Switch
Switch Current Limit
I SW
1
A
Switch Saturation Voltage
Switch Leakage Current
V SAT
I S-LEAK
I SW = 500mA
V SW = 12V
200
0.01
400
1
mV
μA
? 2009 Semtech Corp.
www.semtech.com
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