LTC3875_15 Datasheet, PDF (44/44 Pages) Linear Technology – Dual, 2-Phase, Synchronous Controller with Low Value DCR Sensing and Temperature Compensation

LTC3875
Typical Application
High Efficiency Dual Phase 1V/60A Step-Down Converter
(OPTIONAL)
THERMAL
SENSOR
0.25µH
(0.32mΩ DCR)
INTV_CC
4.7µF
BSC050NE2LS
0.1µF
715 3.57k
BSC010NE2LSI
220nF
220nF
V_OUT
+
470µF
2.5V ×2
SP
V_IN INTV_CC PHASMD
CLKOUT
RUN1,2
PGOOD
ILIM
IFAST
ENTMPB MODE/PLLIN
TG1
TG2
BOOST1
BOOST2
SW1 LTC3875 SW2
EXTV_CC
BG1
BG2
TAVG
TRSET1
SNSA1⁺
SNS1^–
SNSD1⁺
PGND
TRSET2
SNSA2⁺
SNS2^–
SNSD2⁺
TCOMP1
VV_{OOSSNNSS11+–}
I_TH1
TCOMP2
FREQ
VV_{OOSSNNSS22+–}
TK/SS1 TK/SS2 I_TH2
0.1µF
BSC050NE2LS
0.1µF
BSC010NE2LSI
V_IN
22µF ^{6V TO 14V}
16V ×4
(OPTIONAL)
THERMAL
SENSOR
0.25µH
(0.32mΩ DCR)
3.57k 715
220nF
1500pF
100k 10k
220nF
13.3k
V_OUT
1.2V
60A
20k
+ 470µF
2.5V ×2
SP
3875 TA02
Related Parts
PART NUMBER
DESCRIPTION
COMMENTS
LTC3774
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Single Output Current Mode Synchronous Controller with Sub-Milliohm
DCR Sensing
LTC3855
Dual, Multiphase, Synchronous Step-Down DC/DC Controller with
Differential Output Sensing and DCR Temperature Compensation
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LTC3838-2
with Differential Output Sensing
LTC3890/LTC3890-1/ Dual, High V_IN, Low I_Q 2-Phase Synchronous Step-Down DC/DC
LTC3890-2/LTC3890-3 Controller
LTC3861/LTC3861-1 Dual, Multiphase, Synchronous Step-Down Voltage Mode DC/DC
Controller with Diff Amp and Accurate Current Sharing
LTC3856
Single Output, Dual Channel Synchronous Step-Down DC/DC Controller
with Differential Output Sensing and DCR Temperature Compensation
LTC3869
Dual 2-Phase, Synchronous Step-Down DC/DC Controller
LTC3857/LTC3857-1 38V Low I_Q, Dual Output 2-Phase Synchronous Step-Down DC/DC
LTC3858/LTC3858-1 Controller with 99% Duty Cycle
Operates with DrMOS, Power Blocks or External
Drives/MOSFETs, 4.5V ≤ V_IN ≤ 38V,
0.6V ≤ V_OUT ≤ 3.5V
Synchronous Fixed Frequency 250kHz to 770kHz,
4.5V ≤ V_IN ≤ 38V, 0.6V ≤ V_OUT ≤ 3.5V
PLL Fixed Frequency 250kHz to 770kHz,
4.5V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 12V
Synchronizable Fixed Frequency 200kHz to 2MHz,
4.5V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 5.5V
PLL Capable Fixed Frequency 50kHz to 900kHz,
4V ≤ V_IN ≤ 60V, 0.8V ≤ V_OUT ≤ 24V, I_Q = 50µA
Operates with DrMOS, Power Blocks or External
Drivers/MOSFETs, 3V ≤ V_IN ≤ 24V
Phase-Lockable Fixed 250kHz to 770kHz Frequency,
4.5V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 5V
Synchronous Fixed Frequency 250kHz to 780kHz, 4.5V
≤ V_IN ≤ 38V, 0.6V ≤ V_OUT ≤ 12.5V
PLL Fixed Operating Frequency 50kHz to 900kHz,
4V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 24V, I_Q = 50µA/170µA
44 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 950_Fo3_r5_m-7_o4_re1_i7_{nformation www.linear.com/LTC3875}
[phone] ^● FAX: [phone] ^● www.linear.com/LTC3875
3875fa
LT 0415 REV A • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2013