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LTC3890-3 Datasheet, PDF (40/40 Pages) Linear Technology – 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
LTC3890-3
typical application
High Efficiency Dual 12V/3.3V Step-Down Converter
RA1
6.98k
RB1
100k
CITH1A 100pF
CITH1 470pF
RITH1
34.8k
CSS1 0.01µF
SENSE1+
C1
1nF
SENSE1–
PGOOD1
VFB1
BG1
SW1
ITH1
BOOST1
LTC3890-3
TRACK/SS1
TG1
RFREQ
41.2k
CSS2 0.01µF
VOUT1
CITH2 1000pF
RITH2
34.8k
CITH2A
100pF
VIN
PLLIN/MODE
SGND
EXTVCC
RUN1
RUN2
FREQ
INTVCC
PGND
TG2
TRACK/SS2 BOOST2
SW2
ITH2
BG2
INTVCC
100k
CB1
0.47µF
D1
CINT
4.7µF
D2
CB2 0.47µF
MBOT1 RSENSE1
9mΩ
L1
8µH
COUT1
180µF
MTOP1
+ CIN
220µF
MTOP2
L2
4.7µH
RSENSE2
10mΩ
MBOT2
VOUT1
12V
3A
VIN
12.5V TO 60V
VOUT2
3.3V
5A
COUT2
470µF
RA2
31.6k
RB2
100k
VFB2
SENSE2–
C2
1nF
SENSE2+
MTOP1, MTOP2, MBOT1, MBOT2: RJK0651DPB
L1: COILCRAFT SER1360-802KL
L2: COILCRAFT SER1360-472KL
COUT1: 16SVP180MX
COUT2: SANYO 6TPE470M
D1, D2: DFLS1100
38903 TA06
Related Parts
PART NUMBER
LTC3891
DESCRIPTION
60V, Low IQ, Synchronous Step-Down DC/DC Controller
LTC3857/LTC3857-1/
LTC3858/LTC3858-1
LTC3834/LTC3834-1/
LTC3835/LTC3835-1
LTC3810
Low IQ, Dual Output 2-Phase Synchronous Step-Down
DC/DC Controllers with 99% Duty Cycle
Low IQ, Single Output Synchronous Step-Down
DC/DC Controllers with 99% Duty Cycle
100V Synchronous Step-Down DC/DC Controller
LTC3859A
Low IQ, Triple Output Buck/Buck/Boost Synchronous
DC/DC Controller with Improved Burst Mode
40 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/3890-3
COMMENTS
PLL Fixed Frequency 50kHz to 900kHz, 4V ≤ VIN ≤ 60V,
0.8V ≤ VOUT ≤ 24V, TSSOP-20E, 3mm × 4mm QFN-20
PLL Fixed Frequency 50kHz to 900kHz, 4V ≤ VIN ≤ 38V,
0.8V ≤ VOUT ≤ 24V, IQ = 50µA/170µA
PLL Fixed Frequency 140kHz to 650kHz, 4V ≤ VIN ≤ 36V,
0.8V ≤ VOUT ≤ 10V, IQ = 30µA/80µA
Constant On-Time Valley Current Mode, 4V ≤ VIN ≤ 100V,
0.8V ≤ VOUT ≤ 0.93VIN, SSOP-28
Outputs (≥5V) Remain in Regulation Through Cold Crank,
2.5V ≤ VIN ≤ 38V, VOUT(BUCK) Up to 24V, VOUT(BOOST) Up to 60V
38903f
LT 0113 • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2013