LTC3731H_15 Datasheet, PDF (34/34 Pages) Linear Technology – 3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller

LTC3731H
Typical Application
1µF
V5
10Ω
SHORT
PLLFLTR TO
SGND
V_CC
1 _VCC
2 _PLLIN
CLK
PGOOD
3 _{PLLFLTR BOOST1}
4 _FCB
TG1
100pF
5 _NC
SW1
20k
147k
6
LTC3731HG
NC
BOOST2
7 _NC
TG2
8 _EAIN
SW2
S1⁺
S1^{– 1000pF}
9 _SGND
10 _SENSE1+
11 _SENSE1–
V_DR
BG1
PGND
S2⁺
S2^{– 1000pF}
12 _SENSE2+
BG2
13 _SENSE2–
BG3
S3^–
0.01µF S3^{+ 1000pF}
14 _SENSE3–
SW3
15 _SENSE3+
TG3
100pF _10nF V_IN
3.01k
16 _{RUN/SS BOOST3}
I_{TH 17 ITH}
PHASMD
18 _UVADJ
SGND
18k
12k
36 _NC
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
PGOOD
47k
0.1µF ^1Ω
M1
V5
5V TO 7V
V_IN
L1
0.003Ω
V5
0.1µF
1µF
10µF
M2
D1
S1⁺
S1^–
V_IN
M3
L2
0.003Ω
M4
D2
S2⁺
S2^–
0.1µF
V5
V_IN
M5
L3
0.003Ω
M6
D3
S3⁺
S3^–
V_IN: 9V TO 28V
V_OUT: 5V AT 40A
SWITCHING FREQUENCY: 225kHz
3731H TA02
C_IN: KEMET T521X476M035ATE070 s4
C_OUT: SANYO 6TPE220MI s3
D1 TO D3: DIODES INC. B340A
L1 TO L3: 2.2µH WURTH 7443320220
M1, M3, M5: RJK0305DPB
M2, M4, M6: RJK0330DPB
V_OUT
5V AT 40A
47µF +
10V
s3
C_OUT
4.7µF +
50V
s6
V_IN
C_IN ^{9V TO 28V}
47µF
35V
s4
Related Parts
PART NUMBER
LTC3829
LTC3856
LTC3855
LTC3860
LTC3853
LTC3850/
LTC3850-1/
LTC3850-2
DESCRIPTION
3-Phase, Single Output, Synchronous Step-Down Controller
with Differential Amp and DCR Temperature Compensation
2-Phase, Single Output, Synchronous Step-Down Controller
with Differential Amp and DCR Temperature Compensation
Dual, Multiphase, Synchronous Step-Down DC/DC Controller
with Differential Amp and DCR Temperature Compensation
Dual, Multiphase, Synchronous Step-Down DC/DC Controller
with Differential Amp and Tri-State Output Drive
Triple Output, Multiphase Synchronous Step-Down DC/DC
Controller, R_SENSE or DCR Current Sensing and Tracking
Dual 2-Phase, High Efficiency Synchronous Step-Down DC/DC
Controller, R_SENSE or DCR Current Sensing and Tracking
COMMENTS
4.5V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 5V, Active Voltage Positioning, Stage
Shedding
4.5V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 5V, Active Voltage Positioning, Stage
Shedding
Phase-Lockable Fixed Frequency 250kHz to 770kHz, 4.5V ≤ V_IN ≤ 38V,
0.8V ≤ V_OUT ≤ 12V
Operates with Power Blocks, DRMOS Devices or External MOSFETs
3V ≤ V_IN ≤ 24V, t_ON(MIN) = 20ns
Phase-Lockable Fixed 250kHz to 750kHz Frequency, 4V ≤ V_IN ≤ 24V,
V_OUT3 up to 13.5V
Phase-Lockable Fixed 250kHz to 780kHz Frequency, 4V ≤ V_IN ≤ 30V,
0.8V ≤ V_OUT ≤ 5.25V
34 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
3731Hfb
LT 0510 REV B • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2010