SC121ULTRT Просмотр технического описания (PDF) - Semtech Corporation
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SC121ULTRT Datasheet PDF : 23 Pages
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SC121
Absolute Maximum Ratings
IN, OUT, LX, FB (V) . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0
EN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (V + 0.3)
IN
ESD Protection Level(1) (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Recommended Operating Conditions
Ambient Temperature Range (°C). . . . . . . . . . . . -40 to +85
V (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.7 to 4.5
IN
V (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 to 5.0
OUT
Thermal Information
Thermal Res. MLPD, Junction-Ambient(2) (°C/W) . . . . . . . 84
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.
(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 = 2.5V, C = C = 22μF, L = 4.7μH, T = -40 to +85°C. Typical values are at T = 25°C.
IN
IN
OUT
1
A
A
Parameter
Symbol
Conditions
Min Typ Max Units
Input Voltage Range
V
IN
Minimum Startup Voltage
V
IN-SU
Shutdown Current
I
SHDN
Operating Supply Current(1)
I
Q
Internal Oscillator Frequency
f
OSC
Maximum Duty Cycle
D
MAX
Minimum Duty Cycle
D
MIN
Output Voltage
VOUT
Adjustable Output Voltage Range
Regulation Feedback Reference Volt-
age Accuracy (Internal or External
Programming)
V
OUT_RNG
V
Reg-Ref
FB Pin Input Current
IFB
Startup Time
t
SU
I < 1mA, T = 0°C to 85°C
OUT
A
T = 25°C, V = 0V
A
EN
I = 0, V = V
OUT
EN
IN
VFB = 0V
For V such that D < D < D
IN
MIN
MAX
VFB = 1.2V
0.7
4.5
V
0.85
V
0.1
1
μA
3.5
mA
1.2
MHz
90
%
20
%
3.3
V
1.8
5.0
V
-1.5
1.5
%
0.1
μA
1
ms
3
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