l6997 STMicroelectronics, l6997 Datasheet - Page 24

• Manufacturer Part Number: l6997
• Description: Step Down Controller For Low Voltage Operations
• Manufacturer: STMicroelectronics

L6997
Table 14. Efficiency Curves For Different Applications (V
NOTE: For the 25V to 12V conversion the inductor used is: 77120A core 7T.
7.4 EFFICIENCY CURVES
Figure 23. Efficiency vs output Current
24/30
C24
C25
DIODES
D1
OUTPUT CAPACITORS
C11-C12
INPUT CAPACITORS
C13, C14, C16,
C17, C15 C18
INDUCTOR
L1
POWER MOS
Q1,Q2
Q5,Q6
DIODES
D2
INTEGRATED CIRCUIT
U1
100
95
90
85
80
75
70
65
0
Part name
1
2
Fsw = 200KHz
Vin = Vcc = 5V
3
4
5
6
7
1nF
1 F
BAT54
2X100 F
10 F
10 F
10 F
10 F
3 H
STS11NF3LL
STS11NH3LL
STPS2L25U
L6997
8
Output Current (A)
9
10 11 12 13 14 15 16 17 18 19 20 21
Value
0603
Tantalum
B45197-A3107-
K409
EPCOS
C34Y5U1E106Z
TOKIN
C3225Y5V1E106Z
TDK
ECJ4XF1E106Z
PANASONIC
TMK325F106ZH
TAIYO YUDEN
T50-52 Core, 7T
AWG15
STMicroelectronics
STMicroelectronics
STMicroelectronics
Vo = 3.3V
Dimension
POWER SECTION
2.5V
1.5V
1.8V
1.2V
0.9V
Figure 24. Efficiency vs output Current
100
95
90
85
80
75
70
65
60
55
50
0
25V
Output capacitor C8, C9, C10 N.M.
Input capacitor
Q3 N.M.
Q4 N.M.
25V
IN
1
up to 25V) (continued)
2
3
4
Vin = 12V
Vcc = 5V
Fsw = 200KHz
5
6
7
Output Current (A)
8
Notes
9
10 11 12 13 14 15 16 17 18 19
Vo = 5V
3.3V
2.5V
1.8V
1.5V
1.2V
0.9V