LTC3860_15 Datasheet, PDF (36/36 Pages) Linear Technology – Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Current Sharing

LTC3860
TYPICAL APPLICATION
Dual Phase Single Output with DRMOS and R_SENSE
V_IN
7V TO 14V
RUN1
470μF
TRACK/SS1
0.01μF
V_CC
5V
1μF
V_DIFF1
1000pF
COMP1 _VDIFF
20k
220Ω ^47pF
V_OSN
V_OSP
20k
470pF
V_CC
4.7k
V_CC
FB1
COMP1
VSNSOUT
VSNSN
VSNSP
COMP2
FB2
CLOCKIN
600kHz
SYNC INPUT
TRACK/SS1
V_{CC IAVG1}
V_CC
100pF
100k
OPEN
PWM1 ^(OPT)
LTC3860
RUN1
I_LIM1
ISNS1P
ISNS1N
ISNS2N
ISNS2P
I_LIM2
RUN2
59.0k
V_CC
RUN1
45.3k
PWM2
V_CC
OPEN
(OPT)
OPEN
(OPT)
4.7μF
2.2Ω
V_CIN V_IN REG5V BOOT
DISABLE
PWM ^{R2J20602 VSWH}
OPEN ^CGND
(OPT)
V_LDRV PGND
4.7μF
100Ω
5V
0.01μF
V_IN
22μF
0.22μF
1μF
SW1 ^{0.3μH 1mΩ}
0.01μF
5V
4.7μF
CGND V_LDRV
PWM
DISABLE ^R2J20602
PGND
V_SWH
V_CIN V_IN REG5V BOOT
V_OSP
SW2 ^{0.3μH 1mΩ}
0.22μF
1μF
47Ω
47μF
6.3V
s4
V_OUT1
1.2V
330μF _40A
2.5V
s4
4.7μF
22μF
2.2Ω
V_IN
47Ω
V_OSN
3860 TA08
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC3850/LTC3850-1
LTC3850-2
LTC3869/
LTC3869-2
Dual Output, 2-Phase Synchronous Step-Down DC/DC Controller,
R_SENSE or DCR Current Sensing
Dual Output, 2-Phase Synchronous Step-Down DC/DC Controller
with Accurate Current Share
PLL Fixed 250kHz to 780kHz Frequency, 4V ≤ V_IN ≤ 30V,
0.8V ≤ V_OUT ≤ 5.25V
PLL Fixed 250kHz to 750kHz Frequency, 4V ≤ V_IN ≤ 38V,
V_OUT3 Up to 12.5V
LTC3856
Single Output 2-Phase Synchronous Step-Down DC/DC
Controller with Diff Amp and DCR Temperature Compensation
PLL Fixed 250kHz to 770kHz Frequency, 4.5V ≤ V_IN ≤ 38V,
0.8V ≤ V_OUT ≤ 5V
LTC3855
LTC3775
LTC3853
LTC4449
Dual Output, 2-Phase, Synchronous Step-Down DC/DC Controller
with Diff Amp and DCR Temperature Compensation
High Frequency Synchronous Voltage Mode Step-Down DC/DC
Controller
Triple Output, Multiphase Synchronous Step-Down DC/DC
Controller, R_SENSE or DCR Current Sensing and Tracking
High Speed Synchronous N-Channel MOSFET Driver
PLL Fixed Frequency 250kHz to 770kHz, 4.5V ≤ V_IN ≤ 38V,
0.8V ≤ V_OUT ≤ 12V
Very Fast Transient Response, t_ON(MIN) = 30ns, 4V ≤ V_IN ≤ 38V,
0.6V ≤ V_OUT ≤ 0.8V_IN, MSOP-16E, 3mm × 3mm QFN-16
PLL Fixed 250kHz to 750kHz Frequency, 4V ≤ V_IN ≤ 24V,
V_OUT3 Up to 13.5V
V_IN Up to 38V, 4V ≤ V_CC ≤ 6.5V Adaptive Shoot-Through
Protection, 2mm × 3mm DFN-8 Package
LTC4442/LTC4442-1 High Speed Synchronous N-Channel MOSFET Driver
V_IN Up to 38V, 6V ≤ V_CC ≤ 9V Adaptive Shoot-Through
Protection, MSOP-8 Package
LTC3880/LTC3880-1 Dual Output PolyPhase Step-Down DC/DC Controller with Digital V_IN Up to 24V, 0.5V ≤ V_OUT ≤ 5.5V, Analog Control Loop,
Power System Management
I²C/PMBus Interface with EEPROM and 16-Bit ADC
36 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
3860fc
LT 0311 REV C • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2010