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L6997STR Datasheet(PDF) 24 Page - STMicroelectronics

Part # L6997STR
Description  STEP DOWN CONTROLLER FOR LOW VOLTAGE OPERATIONS
PDF  30 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6997STR Datasheet(HTML) 24 Page - STMicroelectronics

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L6997S
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NOTE: For the 25V to 12V conversion the inductor used is: 77120A core 7T.
7.4 EFFICIENCY CURVES
Part name
Value
Dimension
Notes
C24
1nF
0603
C25
1
µFTantalum
DIODES
D1
BAT54
25V
POWER SECTION
OUTPUT CAPACITORS
C11-C12
2X100
µF
B45197-A3107-
K409
EPCOS
Output capacitor C8, C9, C10 N.M.
INPUT CAPACITORS
C13, C14, C16,
C17, C15 C18
10
µF
C34Y5U1E106Z
TOKIN
Input capacitor
10
µF
C3225Y5V1E106Z
TDK
10
µF
ECJ4XF1E106Z
PANASONIC
10
µF
TMK325F106ZH
TAIYO YUDEN
INDUCTOR
L1
3
µH
T50-52 Core, 7T
AWG15
POWER MOS
Q1,Q2
STS11NF3LL
STMicroelectronics
Q3 N.M.
Q5,Q6
STS11NH3LL
STMicroelectronics
Q4 N.M.
DIODES
D2
STPS2L25U
STMicroelectronics
25V
INTEGRATED CIRCUIT
U1
L6997S
Table 14. Efficiency Curves For Different Applications (VIN up to 25V) (continued)
Figure 23. Efficiency vs output Current
Figure 24. Efficiency vs output Current
65
70
75
80
85
90
95
100
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21
0.9V
1.2V
1.5V
1.8V
2.5V
Vo = 3.3V
Vin = Vcc = 5V
Fsw = 200KHz
Output Current (A)
50
55
60
65
70
75
80
85
90
95
100
0
1
2
3
45678
9
10 11 12 13 14 15 16 17 18 19
Output Current (A)
Vin = 12V
Vcc = 5V
Fsw = 200KHz
0.9V
1.2V
1.5V
2.5V
3.3V
Vo = 5V
1.8V



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