LTC3890 Datasheet, PDF (36/36 Pages) Linear Technology – 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller

LTC3890
TYPICAL APPLICATION
High Efficiency Dual 12V/3.3V Step-Down Converter
R_A1
6.98k
R_B1
100k
C_ITH1A 100pF
C_ITH1 470pF
R_ITH1
34.8k
C_SS1 0.01μF
R_FREQ
41.2k
C_SS2 0.01μF
C_ITH2 1000pF
R_ITH2
34.8k
C_ITH2A
100pF
R_A2
31.6k
R_B2
100k
SENSE1⁺
C1
1nF
SENSE1^–
PGOOD1
V_FB1
PGOOD2
BG1
SW1
ITH1
BOOST1
LTC3890
TRACK/SS1
TG1
I_LIM
PHSMD
CLKOUT
PLLIN/MODE
SGND
EXTV_CC
RUN1
RUN2
FREQ
V_IN
INTV_CC
PGND
TG2
TRACK/SS2 BOOST2
SW2
ITH2
BG2
INTV_CC
100k
100k
C_B1
0.47μF
D1
C_INT
4.7μF
D2
C_B2 0.47μF
MBOT1 _RSENSE1
9mΩ
L1
8μH
C_OUT1
180μF
MTOP1
C_IN
220μF
MTOP2
L2
4.7μH
R_SENSE2
10mΩ
MBOT2
V_OUT1
12V
3A
V_IN
12.5V TO 60V
V_OUT2
3.3V
5A
C_OUT2
470μF
V_FB2
SENSE2^–
C2
1nF
SENSE2⁺
MTOP1, MTOP2, MBOT1, MBOT2: RJK0651DPB
L1: COILCRAFT SER1360-802KL
L2: COILCRAFT SER1360-472KL
C_OUT1: 16SVP180MX
C_OUT2: SANYO 6TPE470M
D1, D2: DFLS1100
3890 TA06
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LT3845
Low I_Q, High Voltage Synchronous Step-Down DC/DC
Controller
36 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
COMMENTS
Phase-Lockable Fixed Frequency 50kHz to 900kHz, 4V ≤ V_IN ≤ 38V,
0.8V ≤ V_OUT ≤ 24V, I_Q = 50μA
Phase-Lockable Fixed Frequency 50kHz to 900kHz, 4V ≤ V_IN ≤ 38V,
0.8V ≤ V_OUT ≤ 24V, I_Q = 170μA
Phase-Lockable Fixed Frequency 50kHz to 900kHz, 4V ≤ V_IN ≤ 24V,
0.8V ≤ V_OUT ≤ 14V, I_Q = 170μA
Phase-Lockable Fixed Frequency 140kHz to 650kHz, 4V ≤ V_IN ≤ 36V,
0.8V ≤ V_OUT ≤ 10V, I_Q = 30μA
Phase-Lockable Fixed Frequency 140kHz to 650kHz, 4V ≤ V_IN ≤ 36V,
0.8V ≤ V_OUT ≤ 10V, I_Q = 80μA
Adjustable Fixed Frequency 100kHz to 500kHz, 4V ≤ V_IN ≤ 60V,
1.23V ≤ V_OUT ≤ 36V, I_Q = 120μA, TSSOP-16
3890f
LT 0210 • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2010