LTC3867_15 Datasheet, PDF (36/36 Pages) Linear Technology – Low IQ, Dual 2-Phase Synchronous Step-Down Controller

LTC3867
TYPICAL APPLICATION
12V, 4A Output with R_SENSE Synchronized to 400kHz
PLLIN
400kHz
RUN
V_OSP
INTV_CC
100k
37.4k
143k
7.5k
V_OSN
330pF
22pF
43k
RDDUIIFFNFF+–
DIFFOUT
LTC3867
V_FB
I_TH
PGND
BG
INTV_CC
V_IN
EXTV_CC
ITEMP
470pF
0.1µF
1nF
0.1µF
V_IN
14V TO 24V
M1
V_OSP
L1
6.8µH
R_SENSE
0.011Ω
10Ω 10Ω
M2
10Ω _VOUT
12V
4A
220µF
16V
SDM10K45
INTV_CC
4.7µF
10Ω
V_OSN
M1, M2: Si4816BDY
3867 TA04
RELATED PARTS
PART NUMBER
LTC3833
LTC3878/LTC3879
LTC3775
LTC3854
LTC3851A/LTC3851A-1
LTC3891
LTC3856
LTC3829
LTC3855
LTC3860
LTC3869/LTC3869-2
DESCRIPTION
Fast Accurate Step-Down DC/DC Controller with
Differential Output Sensing
No R_SENSE™ Constant On-Time Synchronous Step-Down
DC/DC Controllers
High Frequency Synchronous Voltage Mode Step-Down
DC/DC Controller
Small Footprint Synchronous Step-Down DC/DC
Controller
No R_SENSE Wide V_IN Range Synchronous Step-Down
DC/DC Controllers
60V, Low I_Q Synchronous Step-Down DC/DC Controller
2-Phase, Single Output Synchronous Step-Down DC/DC
Controller with Diff Amp and DCR Temp Compensation
3-Phase, Single Output Synchronous Step-Down DC/DC
Controller with Diff Amp and DCR Temp Compensation
2-Phase, Dual Output Synchronous Step-Down DC/DC
Controller with Differential Remote Sense
Dual, Multiphase, Synchronous Step-Down DC/DC
Controller with Diff Amp and Tri-State Output Drive
2-Phase, Dual Output Synchronous Step-Down DC/DC
Controllers, with Accurate Multiphase Current Matching
COMMENTS
Very Fast Transient Response, t_ON(MIN) = 20ns, 4.5V ≤ V_IN ≤ 38V,
0.6V ≤ V_OUT ≤ 5.5V, TSSOP-20E, 3mm × 4mm QFN-20
Very Fast Transient Response, t_ON(MIN) = 43ns, 4V ≤ V_IN ≤ 38V,
0.6V ≤ V_OUT ≤ 0.9V_IN, SSOP-16, MSOP-16E, 3mm × 3mm QFN-16
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
Fixed 400kHz Operating Frequency, 4.5V ≤ V_IN ≤ 38V,
0.8V ≤ V_OUT ≤ 5.25V, 2mm × 3mm QFN-12
PLL Fixed Frequency 250kHz to 750kHz, 4V ≤ V_IN ≤ 38V,
0.8V ≤ V_OUT ≤ 5.25V, MSOP-16E, 3mm × 3mm QFN-16, SSOP-16
PLL Capable Fixed Frequency 50kHz to 900kHz, 4V ≤ V_IN ≤ 60V,
0.8V ≤ V_OUT ≤ 24V, I_Q = 50µA
PLL Fixed 250kHz to 770kHz Frequency, 4.5V ≤ V_IN ≤ 38V,
0.6V ≤ V_OUT ≤ 5.25V
PLL Fixed 250kHz to 770kHz Frequency, 4.5V ≤ V_IN ≤ 38V,
0.6V ≤ V_OUT ≤ 5.25V
PLL Fixed Frequency 250kHz to 770kHz, 4.5V ≤ V_IN ≤ 38V,
0.6V ≤ V_OUT ≤ 12.5V
Operates with Power Blocks, DRMOS Devices or External Drivers/
MOSFETs, 3V ≤ V_IN ≤ 24V, t_ON(MIN) = 20ns
PLL Fixed Frequency 250kHz to 780kHz, 4V ≤ V_IN ≤ 30V,
0.6V ≤ V_OUT ≤ 12.5V, 4mm × 5mm QFN-28, SSOP-28
36 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
3867f
LT 0711 • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2011