LTC3714_15 Datasheet, PDF (24/28 Pages) Linear Technology – Intel Compatible, Wide Operating Range, Step-Down Controller with Internal Op Amp

LTC3714
Applications Information
Solving for the required values of the resistors:
R_VP1
=
5V
5V
– I_TH(NOM)
R_VP
=
5V
5V
– 0.55V
20.3k
= 23k
R_VP2
=
5V
I_TH(NOM)
R_VP
=
5V _20.3k
0.55V
= 185k
The modified circuit is shown in Figure 9. Refer to Linear
Technology Design Solutions 10 for additional information
about output voltage positioning.
PC Board Layout Checklist
When laying out the printed circuit board, use the follow-
ing checklist to ensure proper operation of the controller.
+
M1
V_IN
–
–
V_OUT
+
C_IN
C_OUT
D1 ^M2
C_VCC
D_B
C_B
C_SS
C_{C1 RC}
LTC3714
1
BG
INTV_CC ²⁸
2 PGND
27
V_IN
3 _{SENSE EXTVCC} 26
4
SW
25
VID4
5 _TG
VID3 ²⁴
6 _{BOOST VOSENSE} 23
7 _VID0
V_FB ²²
8
VID1
21
I_ON
9 _VID2
FCB ²⁰
10 _RUN/SS SGND 19
11
V_ON
12 _PGOOD
OPOUT ¹⁸
OP^{+ 17}
13 _VRNG
14
I_TH
C_C2
OP ^{– 16}
15
OPV_IN
BOLD LINES INDICATE HIGH CURRENT PATHS
Figure 10. LTC3714 Layout Diagram
C_F
R_F
R_ON
C_ION
C_FB
3714 F10
3714f
24