LP2975 Datasheet, PDF (3/19 Pages) National Semiconductor (TI) – MOSFET LDO Driver/Controller

Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature Range
Operating Junction Temperature
Range
Lead Temp. (Soldering, 5 seconds)
ESD Rating
Power Dissipation
(Note 2)
−65˚C to +150˚C
−40˚C to +125˚C
260˚C
2 kV
Internally Limited
Input Supply Voltage (Survival)
Input Supply Voltage (Operating)
Current Limit Pins (Survival)
Comp Pin (Survival)
Gate Pin (Survival)
ON/OFF Pin (Survival)
Feedback Pin (Survival)
−0.3V to +26V
+1.8V to +24V
−0.3V to +V_IN
−0.3V to +2V
−0.3V to +V_IN
−0.3V to +20V
−0.3V to +24V
Electrical Characteristics
Limits in standard typeface are for T_J = 25˚C, and limits in boldface type apply over the full operating temperature range. Un-
less otherwise specified; V_ON/OFF = 1.5V, V_IN = 15V.
Symbol
Parameter
Conditions
LM2975AI-X.X
Typ
(Note 3)
Min
Max
LM2975I-X.X
(Note 3)
Min
Max
Units
V_REG
V_COMP
Regulation Voltage
(12V Versions)
Regulation Voltage
(5V Versions)
Regulation Voltage
(3.3V Versions)
Comp Pin Voltage
12.5 < V_IN < 24V
12.0 11.820 12.180 11.700 12.300
(V_IN - 0.5V) > V_GATE
> (V_IN - 5V)
11.640 12.360 11.520 12.480
5.5 < V_IN < 24V
5.0 4.925 5.075 4.875 5.125
(V_IN - 0.5V) > V_GATE
> (V_IN - 4.5V)
4.850 5.150 4.800 5.200
V
3.8 < V_IN < 24V
3.3 3.250 3.350 3.217 3.383
(V_IN - 0.5V) > V_GATE
> (V_IN - 3.3V)
3.201 3.399 3.168 3.432
V_REG < V_IN < 24V
1.240 1.215 1.265 1.203 1.277
V
1.209 1.271 1.196 1.284
I_Q
Quiescent Current
V_IN = 5V
180
240
320
240
320
µA
V_CL
Current Limit
Sense Voltage
V_ON/OFF = 0V
V_IN = 15V
V_FB = 0.9 X V_REG
0.01
1
1
57
45
69
45
69
mV
39
72
39
72
V_ON/OFF
ON/OFF Threshold
Output = ON
Output = OFF
1.10
1.10
0.94
1.20
1.20
V
0.70
0.70
0.87
0.40
0.40
I_ON/OFF
ON/OFF
Input Bias Current
V_ON/OFF = 1.5V
34
50
75
50
µA
75
I_G
Gate Drive Current (Sourcing) V_G = 7.5V
3.5
1.3
V_FB= 1.1 X V_REG
0.3
1.3
mA
0.3
Gate Drive Current (Sinking)
V_G = 7.5V
V_FB = 0.9 X V_REG
1100 350
40
350
40
µA
V_G(MIN)
R(V_IN-G)
Gate Clamp Voltage
Resistance from
Gate to V_IN
Open Loop
Voltage Gain
V_IN = 24V
V_FB = 0.9 X V_REG
17
15
19
15
19
V
V_IN = 24V
500
kΩ
V_ON/OFF = 0
V_IN = 15V
5000
V/V
0.5V ≤ V_GATE ≤ 13
Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the de-
vice outside of its rated operating conditions.
Note 2: The LP2975 has internal thermal shutdown which activates at a die temperature of about 150˚C. It should be noted that the power dissipated within the
LP2975 is low enough that this protection circuit should never activate due to self-heating, even at elevated ambient temperatures.
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