l6995 STMicroelectronics, l6995 Datasheet - Page 14

• Manufacturer Part Number: l6995
• Description: Step Down Controller For High Differential Input-output Conversion
• Manufacturer: STMicroelectronics

L6995
Table 3. PCB Layout guidelines
Table 4. Component list
The component list is shared in two sections: the first for the general-purpose component, the second for power
section:
14/25
Low radiation and low magnetic coupling
with the adjacent circuitry.
Don’t penalty the efficiency.
Ensure high accuracy in the current sense
system.
Reduce the noise effect on IC.
RESISTOR
CAPACITOR
R6, R7, R11, R12
Part name
R10
R13
C19
C20
R1
R2
R3
R4
R5
R8
R9
C1
C2
C3
C4
C5
C6
C7
Goal
560k
220nF
220nF
330pF
220nF
220nF
Value
100
300
390
220
33k
33k
47k
47 F
47pF
10nF
N.M.
47
1K
GENERAL-PURPOSE SECTION
1) Small switching current loop areas. (For example placing C
2) Controller placed as close as possible to the power MOSFET.
3) Group the gate drive component (Boot cap and diode together near
Keep power traces and load connections short and wide.
Phase pin and PGND pin must be made with Kelvin connection and as
close as possible to the Low Side MOSFETS.
1) Put the feedback component (like output divider, integrator network,
2) The feedback traces must be parallel and as close as possible.
3) Make the controller ground connection like the figure 19.
Side and Low side MOSFETS, Shottky diode as close as possible).
Moreover they must be routed as far as possible from the switching
current loops.
the IC.
etc) as close as possible to the IC.
KEMET-16V
Dimension
0603
0603
0603
0603
0603
0603
0603
0603
0603
0603
0805
0805
0603
0603
0603
0603
0805
0603
Suggestion
Output resistor divider for the
(To set switching frequency)
Second integrator capacitor
First integrator capacitor
(To set output voltage)
Output resistor divider
Input resistor divider
Current limit resistor
(To set current limit)
Softstart capacitor
linear regulator.
Notes
IN
, High