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L6997S Datasheet(PDF) 23 Page - STMicroelectronics

Part # L6997S
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

L6997S Datasheet(HTML) 23 Page - STMicroelectronics

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L6997S
7.3 EFFICIENCY CURVES
Figure 22. Efficiency vs output Current
Table 14. Efficiency Curves For Different Applications (VIN up to 25V)
Part name
Value
Dimension
Notes
GENERAL-PURPOSE SECTION
RESISTOR
R1
100
Ω
0603
Output resistor divider for the linear regulator.
R2
300
Ω
0603
R3
560k
Ω
0603
Input resistor divider (To set switching frequency)
R4
10k
Ω
0603
R5
47
Ω
0603
R6, R7, R11, R12
33k
Ω
0603
R8
47k
Ω
0603
Current limit resistor (To set current limit)
R9
2,7k
Ω
0603
Output resistor divider (To set output voltage)
R10
1k
Ω
0603
R13
220
Ω
0603
CAPACITOR
C1
220 nF
0805
C2
47
µFKEMET-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)
Vcc=Vin=3.3V
Fsw=200KHz
Vout=0.9V
Vout=1.2V
Vout=1.5V
Vout=1.8V
Vout=2.5V



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