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L6997S

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
L6997S
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Table 13. Component list
The component list is shared in two sections: the first for the general-purpose component, the second for
power section:
Part name Value Dimension Notes
GENERAL-PURPOSE SECTION
RESISTOR
R1 N.M. 0603 Output resistor divider for the linear regulator.
R2 N.M. 0603
R3 560kΩ 0603 Input resistor divider (To set switching frequency)
R4 5.6kΩ 0603
R5 47Ω 0603
R6, R7, R11, R12 33kΩ 0603
R8 62kΩ 0603 Current limit resistor (To set current limit)
R9 2.7kΩ 0603 Output resistor divider (To set output voltage)
R10 1.3kΩ 0603
R13 220Ω 0603
CAPACITOR
C1 220nF 0805
C2 47µF KEMET-16V
C3 220nF 0805
C4 150pF 0603 First integrator capacitor
C5 47pF 0603
C6 10nF 0603
C7 N.M. 0603 Second integrator capacitor
C19 220nF 0805
C20 220nF 0603 Softstart capacitor
C21 47pF 0603
C22 220nF 0805
C23 0603 N.M.
C24 1nF 0603
C25 1µFTantalum
DIODES
D1 BAT54 25V
POWER SECTION
OUTPUT CAPACITORS
C11-C12 2X680µF T510x687(1)004AS
KEMET
Output capacitor C8, C9, C10 N.M.
INPUT CAPACITORS
C13, C14, C16, C17,
C15 C18
100µF ECJ5YF0J1072
PANASONIC
Input capacitor
47µF ECJ5YF1A4767
PANASONIC
INDUCTOR
L1 1.8µH ETQF6F1R8BFA
PANASONIC
POWER MOS
Q1,Q2 SI4442DY VISHAY Siliconix Q3 N.M.
Q5,Q6 SI4442DY VISHAY Siliconix Q4 N.M.
INTEGRATED CIRCUIT
U1 L6997S
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L6997S
7.3 EFFICIENCY CURVES
Figure 22. Efficiency vs output Current
Table 14. Efficiency Curves For Different Applications (V
IN
up to 25V)
Part name Value Dimension Notes
GENERAL-PURPOSE SECTION
RESISTOR
R1 100Ω 0603 Output resistor divider for the linear regulator.
R2 300Ω 0603
R3 560kΩ 0603 Input resistor divider (To set switching frequency)
R4 10kΩ 0603
R5 47Ω 0603
R6, R7, R11, R12 33kΩ 0603
R8 47kΩ 0603 Current limit resistor (To set current limit)
R9 2,7kΩ 0603 Output resistor divider (To set output voltage)
R10 1kΩ 0603
R13 220Ω 0603
CAPACITOR
C1 220 nF 0805
C2 47µFKEMET-16V
C3 220nF 0805
C4 150pF 0603 First integrator capacitor
C5 47pF 0603
C6 10nF 0603
C7 330pF 0603 Second integrator capacitor
C19 220nF 0805
C20 10nF 0603 Softstart capacitor
C21 47pF 0603
C22 220nF 0805
C23 0603 N.M.
75
80
85
90
95
100
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Output Current (A)
Efficiency (%)
Vcc=Vin=3.3V
Fsw=200KHz
Vout=0.9V
Vout=1.2V
Vout=1.5V
Vout=1.8V
Vout=2.5V
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 1µFTantalum
DIODES
D1 BAT54 25V
POWER SECTION
OUTPUT CAPACITORS
C11-C12 2X100µF B45197-A3107-
K409
EPCOS
Output capacitor C8, C9, C10 N.M.
INPUT CAPACITORS
C13, C14, C16,
C17, C15 C18
10µF C34Y5U1E106Z
TOKIN
Input capacitor
10µF C3225Y5V1E106Z
TDK
10µF ECJ4XF1E106Z
PANAS ONIC
10µF 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 (V
IN
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)
Efficiency (%)
50
55
60
65
70
75
80
85
90
95
100
012345678910111213141516171819
Output Current (A)
Efficiency (%)
Vin = 12V
Vcc = 5V
Fsw = 200KHz
0.9V
1.2V
1.5V
2.5V
3.3V
Vo = 5V
1.8V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30

L6997S

Mfr. #:
Buy L6997S
Manufacturer:
STMicroelectronics
Description:
Switching Controllers STEP DOWN CONTROLLER Lo Vltg Operations
Lifecycle:
New from this manufacturer.
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