LTC3836_15 Datasheet, PDF (24/30 Pages) Linear Technology – Dual 2-Phase, No RSENSETM Low VIN Synchronous Controller

LTC3836
APPLICATIONS INFORMATION
V_IN
R_IN
+
C_IN
L1
V_OUT1
+
C_OUT1
R_L1
BOLD LINES INDICATE
HIGH, SWITCHING
CURRENT LINES.
KEEP LINES TO A
MINIMUM LENGTH
L2
V_OUT2
+
C_OUT2
R_L2
3836 F14
Figure 14. Branch Current Waveforms
V_IN
2.75V TO 4.5V
C_FFW1, 33pF
R_FB1B, 118k
R_TRACKB, 12.4k
R_FB1A, 59k
R_TRACKA, 11.8k
C_ITH1A, 82pF
LTC3836EUFD
1
V_FB1
24
BOOST1
D_B1
C_B1, 0.22μF
7
TRACK/SS2
26
SW1
SENSE1^{+ 25}
M1
C_IN
X2
C_ITH1, 820pF
R_ITH1, 15.8k
C_{PLLLPF RPLLLPF}
C_SS, 10nF
C_VIN, 1μF
R_VIN, 10Ω
2
I_TH1
27
IPRG1
4
PLLLPF
21
SYNC/FCB
17
RUN/SS
5
SGND
6
10 ^VIN
20
TG1
22
BG1
23
PGND
29
PGND
19
PGND
14
PGND
15
BG2 ₁₈
TG2
PGOOD
C_ITH2A, 82pF
C_ITH2, 820pF
R_ITH2, 15.8k
3 _IPRG2
9 _ITH2
SENSE2^{+ 12}
11
SW2
BOOST2 ¹³
M4
C_B2, 0.22μF
R_FB2A, 59k
8
V_FB2 N/C N/C
D_B2
16 28
L1, L2: VISHAY IHLP2525CZERR 47M01
C_IN: 22μF X2, 6.3V, X5R
C_OUT1, C_OUT2: TAIYO YUDEN JMK235BJ107MM X2
M1-M4: VISHAY Si7882DP
L1
M2
D1
V_OUT1
1.8V
15A
C_OUT1
X2
M3
D2
L2
C_OUT2
X2
V_OUT2
1.2V
15A
R_FB2B, 59k
3836 F15
Figure 15. 2-Phase, 550kHz, Dual Output Synchronous DC/DC Converter
with Ceramic Output Capacitors
24
3836fb