Datasheet

18
LTC3701
3701fa
TYPICAL APPLICATIO S
U
2-Phase, Synchronizable Dual Output Step-Down DC/DC Converter
–
+
LT1004-1
1.2V
15k
3
2
1
5
0.01µF
FB2
3701 TA05
1N4148
4
V
OUT1
LT1797
V
IN
Optional Output Sequencing Circuit
+
+
SENSE1
–
I
TH
/RUN1
V
FB1
SGND
V
FB2
I
TH
/RUN2
PLLLPF
SENSE2
–
SENSE1
+
V
IN
PGATE1
PGND
PGATE2
PGOOD
EXTCLK/MODE
SENSE2
+
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LTC3701
C6 220pF
C4 220pF
R10
10k
R5
10k
10k
10nF
R6
78.7k
R8
80k
R9
100k
R7
169k
R1
0.03Ω
L1
4.7µH
C1
47µF
C2
10µF
C5
47µF
C1, C5: SANYO 6TPA47M
C2: TAIYO YUDEN LMK325BJ106K-T
R2
0.03Ω
L2
4.7µH
D1
M1
M2
100k
D2
V
IN
3701 TA02
V
IN
2.7V to 9.8V
V
OUT1
2.5V
2A
GND
V
OUT2
1.8V
2A
D1, D2: IR10BQ015
L1, L2: MURATA LQN6C-4R7
M1, M2: Si3443DV
R1, R2: DALE 0.25W
2-Phase, 550kHz Single Output Step-Down DC/DC Converter
+
SENSE1
–
I
TH
/RUN1
V
FB1
SGND
V
FB2
I
TH
/RUN2
PLLLPF
SENSE2
–
SENSE1
+
V
IN
PGATE1
PGND
PGATE2
PGOOD
EXTCLK/MODE
SENSE2
+
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LTC3701
C4
220pF
R5
10k
R6
78.7k
R7
169k
R1
0.03Ω
L1
4.7µH
C1
47µF
C2
10µF
V
IN
2.5V TO 9.8V
V
OUT
2.5V
4A
R2
0.03Ω
L2
4.7µH
D1
M1
M2
D2
3701 TA03
C1: SANYO 6TPA47M
C2: TAIYO YUDEN LMK325BJ106K-T
D1, D2: IR10BQ015
L1, L2: MURATA LQN6C-4R7
M1, M2: Si3443DV
R1, R2: DALE 0.25W
Single Cell Li-Ion to 3.3V (Zeta Converter) and 1.8V (Buck Converter)
+
+
SENSE1
–
V
FB1
I
TH
/RUN1
SGND
I
TH
/RUN2
V
FB2
PLLLPF
SENSE2
–
SENSE1
+
V
IN
PGATE1
PGND
PGATE2
PGOOD
EXTCLK/MODE
SENSE2
+
1
3
2
4
6
5
7
8
16
15
14
13
12
11
10
9
LTC3701
C6 470pF
C4 220pF
C3 10µF
R10
47k
R5
10k
10k
10nF
R6
78.7k
R8
80.6k
R9
100k
R7
249k
R1
0.025Ω
L1A
L1B
•
•
C1
C2
22µF
C5
47µF
C1, C5: SANYO 6TPA47M
C2: TAIYO YUDEN JMK325BJ226MM
C3: TAIYO YUDEN JMK316BJ106ML
D1, D2: IR10BQ015
R2
0.03Ω
L2
4.7µH
M1
M2
100k
D2
D1
V
IN
3701 TA06
V
IN
2.7V to 4.2V
V
OUT1
3.3V
1A
GND
V
OUT2
1.8V
2A
L1A, L1B: COILTRONICS CTX5-2
L2: MURATA LQN6C-4R7
M1, M2: Si3443DV
R1, R2: DALE 0.25W