SC4540 データシートの表示（PDF） - Semtech Corporation
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SC4540 Datasheet PDF : 15 Pages
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SC4540
Absolute Maximum Ratings
Recommended Operating Conditions
Supply Voltage (V) . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +20.0
LX Voltage, Output Voltage (V) . . . . . . . . . . . . . -0.3 to +45
Current Sink Voltage (V) . . . . . . . . . . . . . . . . . . . . -0.3 to +45
Enable Voltage (V) . . . . . . . . . . . . . . . . . . . . . . -0.3 to (V + 0.3)
IN
Compensation Voltage (V) . . . . . . . . . . . . . . . . . . -0.3 to +2.0
Current Set Voltage (V) . . . . . . . . . . . . . . . . . . . . . . -0.3 to +2.0
ESD Protection Level(1) (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Supply Voltage (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.8 to 12
Output Voltage (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 to 38
Ambient Temperature Range (°C) . . . . . . . . . . . . . -40 to +85
Thermal Information
Thermal Resistance, Junction to Ambient(2) (°C/W) . . . . . 74
Maximum Junction Temperature (°C) . . . . . . . . . . . . . . +150
Storage Temperature Range (°C) . . . . . . . . . . . . -65 to +150
Peak IR Reflow Temperature (10s to 30s) (°C) . . . . . . . +260
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) Tested according to JEDEC standard JESD22-A114-B.
(2) Calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
Electrical Characteristics
Unless otherwise noted: V = 7.2V, C = 2.2μF, C = 1μF, C = 47nF, R = 1.27kΩ, R = 5.76kΩ, L = 56μH, T = -40 to 85ºC, typical values are at T = 25ºC.
IN
IN
OUT
COMP
COMP
ISET
A
A
Parameter
Symbol
Conditions
Min Typ Max Units
UVLO Threshold
UVLO Hysteresis
Quiescent Supply Current
Shutdown Supply Current
EN Logic High Voltage
EN Logic Low Voltage
EN Logic Input Current
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
V
UVLO
V
UVLO-HYS
I
Q
I
SHDN
V
IN
V
IL
II
IL, IH
T
SD
V rising
IN
Not switching
EN tied to GND
V = 12V, V = 0V to 1.8V
IN
EN
VIN = 12V, VEN = 1.8V to 12V
T rising
J
2.40 2.60 2.79
V
120
mV
1.9
mA
0.1
3
μA
1.80
V
0.8
V
±0.01 ±1
μA
±0.01 ±5
155
°C
20
°C
Boost Converter Characteristics
Switching Frequency
Maximum Duty Cycle
Minimum On-Time
f
SW
D
MAX
t
ON(MIN)
T = 25°C
A
680 800 920 kHz
92
%
100
ns
3
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