LP2951ACD-33R2G Datasheet, PDF (13/22 Pages) ON Semiconductor – 100 mA, Low Power Low Dropout Voltage Regulator

LP2950, LP2951, NCV2951
+ 5.0 V
4
1N4001
20 mA
4.7 k
1
5
Output*
8
NC
5 _Error ^Vin _Vout ^{1 2}
SNS ² NC
LP2951CN
NC ³ SD
V_O T ⁶ NC
0.1 mF
Gnd FB
4
7
4
* High for
I_L < 3.5 mA
1N457
1N457
360
1N457
Figure 27. Open Circuit Detector for 4.0 to 20 mA Current Loop
2
MC34164P−5 ¹
3
100 k
31.6 k
2N3906
6.0 V Lead-Acid
Battery
8
NC ⁵ Error ^{Vin V}out ¹
SNS ²
LP2951CN
3 _SD
V_O T ⁶ NC
Gnd FB
4
7
NC
Figure 28. Low Battery Disconnect
1.0 mF
Main V+
Memory V+
20
NiCad Backup
Battery
100
2.4
Free Air
P_D(max) for T_A = 50C
90
Mounted
2.0
Vertically
80
Minimum
70
Size Pad
60
2.0 oz. Copper
L
1.6
ÎÎÎÎÎÎ _L
1.2
ÎÎÎÎÎÎ _0.8
50
0.4
R_qJA
40
0
0
5.0
10
15
20
25
30
L, LENGTH OF COPPER (mm)
Figure 29. DPAK Thermal Resistance and Maximum
Power Dissipation versus PCB Copper Length
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