LTC3709_15 Datasheet, PDF (24/24 Pages) Linear Technology – Fast 2-Phase, No RSENSE Synchronous DC/DC Controller with Tracking/Sequencing

LTC3709
TYPICAL APPLICATIO
Low Output Ripple, 2-Phase 12V/25A Supply
C_SS 0.1µF
C_C 1nF ^{RC 20k}
220pF
5V
1
RUN/SS
2
I_TH
3
V_FB
4
TRACK
32
V_RNG
31
FCB
30
I_ON
29
PGOOD
5
SGND
28
BOOST1
6
SGND
27
TG1
R_F2 10k
100nF
R_F1 191k
3.32k
7 _VOS– LTC3709 _SW1 26
8 _{DIFFOUT SENSE1+} 25
9 _VOS+
SENSE1^{– 24}
10
23
EXTLPF PGND1
11
INTLPF
22
BG1
470pF
C_B2
0.22µF
12
NC
13
BOOST2
14
TG2
21
DRV_CC
20
BG2
19
PGND2
15
SW2
SENSE2^{– 18}
16 _SENSE2+
17
V_CC
100pF
10k
10nF
26.1k
R_ON 2.86M
R_PGOOD 100k
D_B1 CMDSH-3
C_B1 0.22µF
V_IN
20V–28V
DRV_CC
5V
M1
100pF
1µF
1µF
10Ω
1µF
D_B2
CMDSH-3
C_IN 10µF
35V ×3
M3
D1
B340A
M2
L1
3.5µH
C_OUT
180µF
16V ×2
V_OUT
L2
3.5µH
M4
D2
B340A
M1-M4: RENESAS HAT2167
C_OUT: SANYO 16SVP180MX
L1, L2: SUMIDA CDEP147-3R5MC-H
3709 TA02
RELATED PARTS
PART NUMBER
LTC1708
LTC1778
LTC3413
LTC3708
DESCRIPTION
Fast 2-Phase Dual Output Step-Down Controller
Wide Operating Range, No R_SENSE Step-Down Controller
DDR, QDR Memory Termination Regulator
Fast, Dual No R_SENSE, 2-Phase Synchronous Step-Down Controller
LTC3728
Dual, 550kHz, 2-Phase Synchronous Step-Down Switching Regulator
LTC3729
550kHz, PolyPhase, High Efficiency, Synchronous Step-Down
Switching Regulator
LTC3730/LTC3731 3-Phase to 12-Phase Synchronous Step-Down Controllers
LTC3732
LTC3778
Wide Operating Range, No R_SENSE Step-Down Controller
COMMENTS
PLL, V_IN up to 36V, Tracking
Single Channel, GN16 Package
±3A Output Current, 90% Efficiency
Very Fast Transient Response; Very Low Duty Factor
Tracking; Minimum C_IN, C_OUT
Fixed Frequency, Dual Output
Fixed Frequency, Single Output, Up to 12-Phase
Operation
40A to 240A, 4.5V ≤ V_IN ≤ 32V, 0.6V ≤ V_OUT ≤ 5V
Single Channel, Separate V_ON Programming
24 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
3709fb
LT/LWI 1006 REV B • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2004