LTC3850-1_15 Datasheet, PDF (33/38 Pages) Linear Technology – Dual, 2-Phase Synchronous Step-Down Switching Controller

LTC3850/LTC3850-1
TYPICAL APPLICATIONS
V_OUT1
1.8V
5A
1Ω
4.7µF
M1
L1
0.75µH
0.1µF
D3 _{VIN PGOOD EXTVCC INTVCC}
D4
TG1
TG2
BOOST1
BOOST2
SW1
SW2
BG1
LTC3850
BG2
1.2k
1%
PLLIN
750kHz
MODE/PLLIN
PGND
I_LIM
FREQ/PLLFLTR
2.94k
1%
47pF
0.047µF
SENSE1⁺
SENSE1^–
SENSE2⁺
SENSE2^–
RUN1
RUN2
25.5k
1%
C_OUT1
20k
100µF
1%
X2
2200pF
14k
1%
V_FB1
I_TH1
V_FB2
I_TH2
100pF ^{TK/SS1 SGND TK/SS2}
1nF
0.1µF
0.1µF
L1, L2: TOKO FDV0630 0.75µH
M1, M2: VISHAY SILICONIX Si4816BDY
C_OUT1, C_OUT2: TAIYO YUDEN JMK325BJ107MM
0.1µF
4.7µF
6.3V
2x
M2
L2
0.75µH
1.2k
1%
0.047µF
4.99k
1%
100pF
10nF
10k
1%
2200pF
14k
1%
10k
100pF ^1%
20k
1%
38501 F19
5V ± 0.5V
V_OUT2
1.2V
5A
C_OUT2
100µF
X2
Figure 19. 1.8V/5A, 1.2V/5A Core-I/O Converter with a 5V Input Synchronized at 750kHz
V_OUT1
2.5V
5A
V_IN1
12V
4.7µF
2.2Ω
1µF
13.0k
V_IN2
3.3V
4.7µF
2x
L1
2.2µH
3.74k
1%
47pF
4.7µF
M1
0.1µF
1.40k
1%
0.1µF
D3 _{VIN PGOOD EXTVCC INTVCC}
TG1
TG2
BOOST1
SW1
BG1
LTC3850
BOOST2
SW2
BG2
MODE/PLLIN
PGND
I_LIM
FREQ/PLLFLTR
SENSE1⁺
SENSE2⁺
SENSE1^–
RUN1
SENSE2^–
RUN2
10k
D4
0.1µF
10k
1%
0.1µF
M2
L2
0.75µH
1.2k
1%
4.32k
1%
100pF
43.2k
1%
C_OUT1
20k
100µF
1%
X2
2200pF
10k
1%
V_FB1
I_TH1
100pF ^TK/SS1
0.1µF
L1: TOKO FDV0630 2.2µH
L2: TOKO FDV0630 0.75µH
M1, M2: VISHAY SILICONIX Si4816BDY
C_OUT1, C_OUT2: TAIYO YUDEN JMK325BJ107MM
SGND
V_FB2
I_TH2
TK/SS2
0.1µF
3.16k
1%
2200pF
6.04k
1%
100pF
20k
1%
10k
1%
38501 F20
V_OUT2
1.2V
5A
C_OUT2
100µF
X2
Figure 20. 2.5V/5A, 1.2V/5A Core-I/O Converter with Dual Inputs
38501fc
33