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SC4509
POWER MANAGEMENT
PRELIMINARY
Absolute Maximum Rating
Exceeding the speci ? cations below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters speci ? ed in the
Electrical Characteristics section is not implied. Exposure to Absolute Maximum rated conditions for extended periods of time may affect device reliability.
Parameter
Input Supply Voltage
SW Voltage
Maximum Output Voltage
Feedback Voltage
EN/SS Voltage
Maximum Junction Temperature
Storage Temperature Range
Symbol
V IN
V SW
V OUT
V FB
V EN/SS
T J
T STG
Maximum
-0.3 to 20
-0.3 to 30
30
-0.3 to 20
-0.3 to V IN + 0.3
125
-65 to +150
Units
V
V
V
V
V
°C
°C
Thermal Impedance
Junction to Ambient (1)
MLPD-W8
SOT23-6
θ JA
78
165
C/W
Lead Temperature (Soldering), 10s (SOT23-6 package only)
Peak IR Flow Temperature, (10-40sec)
ESD Rating (Human Body Model) (2)
T LEAD
T PKG
V ESD
300
260
2
°C
°C
kV
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.
Electrical Characteristics
Unless speci ? ed: V IN = V EN/SS = 3.6V; C IN = 1 μ F; C OUT = 0.22 μ F; L = 22 μ H; unless otherwise noted, T A = +25°C for Typ, -40oC to 85°C for Min and Max.
Parameter
Input Voltage
Symbol
V IN
Conditions
Min
2.7
Typ
Max
10
Units
V
Quiescent Current
Feedback Voltage
Feedback Pin Bias Current
I Q
V FB
I QFB
No switching
182
2.6
199
35
3.3
216
100
mA
mV
nA
Switching Frequency
f OSC
T A =25 °C
1.0
1.2
1.4
MHz
Maximum Output Voltage
V OUT
20
V
Switch Saturation Voltage
Maximum Duty Cycle
V CESAT
D MAX
I SW = 85mA; T A =25 °C
V FB = GND
90
160
300
mV
%
Switch Current Limit
Switch Leakage Current
Shutdown Current
PWM Dimming Frequency (1)
I cl
I LKG
I SHD
f DIM
I LOAD = 0; T A =25 °C
V SW = 5V; V OUT = Open
V EN/SS = GND; V IN = 3V; V OUT = Open
300
500
0.01
3
1
700
5.0
5
10
mA
μ A
μ A
kHz
EN/SS Threshold Low
EN/SS Threshold High
V IL
V IH
1.8
50
mV
V
? 2007 Semtech Corp.
2
www.semtech.com
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