LTC3879_15 Datasheet, PDF (22/28 Pages) Linear Technology – Fast, Wide Operating Range No RSENSE Step-Down Controller

LTC3879
APPLICATIONS INFORMATION
C_SS
C_{C1 RC}
R1
R2
1 _{TRACK/SS BOOST} 16
2 _PGOOD
TG ¹⁵
3 _VRNG
SW ¹⁴
LTC3879
4 _MODE
PGND ¹³
5
C_{C2 6}
I_TH
SGND
7 _ION
8 _VFB
R_ON
BG ¹²
INTV_CC ¹¹
V_IN ¹⁰
RUN ⁹
C_B
D_B
C_VCC
C_F
R_F
L
M1
C_IN
M2
C_OUT
BOLD LINES INDICATE HIGH CURRENT PATHS
3879 F11
Figure 11. LTC3879 Layout Diagram Without Ground Plane
+
V_IN
–
–
V_OUT
+
TYPICAL APPLICATIONS
4.5V to 14V Input, 1.2V/20A Output at 300kHz with Coincident Rail Tracking
V_MASTER
R_TR1
10.0k
R1
10.0k
R_TR2
10.0k
R2
57.6k
1 _{TRACK/SS BOOST} 16
R_PG
100k
2
LTC3879
PGOOD
TG ¹⁵
D_B
CMDSH-3
C_B
0.22μF
C_C1
330pF
R_C
15k
3 _VRNG
4 _MODE
5 _ITH
C_C2
47pF
6 _SGND
SW ¹⁴
PGND ¹³
BG ¹²
INV_CC ¹¹
C_VCC
4.7μF
R_FB1
10.0k
R_FB2
10.0k
C_PL
470pF
7 _ION
8 _VFB
R_ON
576k
V_IN ¹⁰
RUN ⁹
C_F
R_F
0.1μF 1Ω
C_IN1
10μF
16V
s2
M1
RJK0305DPB ^L1
0.44μH
C_{OUT1 +}
330μF
2.5V
M2
s3
RJK0330DPB
+ C_IN2
180μF
16V
C_OUT2
100μF
6.3V
s2
V_IN
4.5V TO 14V
V_OUT
1.2V
20A
C_IN1: TDK C3225X5R1C106MT s2
C_OUT1: SANYO 2R5TPE330M9 s3
C_OUT2: MURATA GRM31CR60J107ME39 s2
L1: PULSE PA0513.441NLT
3879 TA02
3879f
22