LTC3866 Datasheet, PDF (36/36 Pages) Linear Technology – Current Mode Synchronous Controller for Sub Milliohm DCR Sensing

LTC3866
Typical Application
High Efficiency Step-Down Converter with Power Block
1500pF
220pF
10k
0.1µF
100k
100k
24 23 22 21 20 19
INTV_CC
1µF
30.1k
20k
1 _ITH
2
V_FB
3 _DIFFOUT
4 _DIFFN
5 _DIFFP
6 _SNSD+
LTC3866EUF
18
EXTV_CC
17
V_IN
INTV_CC ¹⁶
BOOST ¹⁵
TG ¹⁴
SW ¹³
BG ¹²
25 7 8 9 10 11
47nF
47nF
INTV_CC
2.2Ω
V_IN
4.7µF
CMDSH-3
0.1µF
470µF
V_IN
10µF
INTV_CC
1
V_IN1
7
V_IN2
5
PWMH
4
PWML
3
V_GATE
2
GND
6
GND
9
GND
13
GND
11
V_OUT1
12
V_OUT2
TEMP^{+ 15}
TEMP^{– 14}
CS^{– 10}
CS^{+ 8}
ACBEL POWER BLOCK
VRA001-4C1G
V_OUT
100µF
10Ω
4.75k
+
+
330µF
10Ω
330µF
V_OUT
1.5V
40A
GND
3866 TA03
Related Parts
PART NUMBER
DESCRIPTION
COMMENTS
LTC3833
Fast Accurate Step-Down DC/DC Controller with
Differential Output Sensing
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
LTC3878/LTC3879
No R_SENSE™ Constant On-Time Synchronous Step-Down Very Fast Transient Response, t_ON(MIN) = 43ns, 4V ≤ V_IN ≤ 38V,
DC/DC Controllers
0.6V ≤ V_OUT ≤ 0.9V_IN, SSOP-16, MSOP-16E, 3mm × 3mm QFN-16
LTC3775
High Frequency Synchronous Voltage Mode Step-Down Very Fast Transient Response, t_ON(MIN) = 30ns, 4V ≤ V_IN ≤ 38V,
DC/DC Controller
0.6V ≤ V_OUT ≤ 0.8V_IN, MSOP-16E, 3mm × 3mm QFN-16
LTC3854
Small Footprint Synchronous Step-Down DC/DC
Controller
Fixed 400kHz Operating Frequency, 4.5V ≤ V_IN ≤ 38V,
0.8V ≤ V_OUT ≤ 5.25V, 2mm × 3mm QFN-12
LTC3851A/LTC3851A-1 No R_SENSE Wide V_IN Range Synchronous Step-Down
DC/DC Controllers
PLL Fixed Frequency 250kHz to 750kHz, 4V ≤ V_IN ≤ 38V,
0.8V ≤ V_OUT ≤ 5.25V, MSOP-16E, 3mm × 3mm QFN-16, SSOP-16
LTC3891
60V, Low I_Q Synchronous Step-Down DC/DC Controller PLL Capable Fixed Frequency 50kHz to 900kHz, 4V ≤ V_IN ≤ 60V,
0.8V ≤ V_OUT ≤ 24V, I_Q = 50µA
LTC3856
2-Phase, Single Output Synchronous Step-Down DC/DC PLL Fixed 250kHz to 770kHz Frequency, 4.5V ≤ V_IN ≤ 38V,
Controller with Diff Amp and DCR Temp Compensation 0.6V ≤ V_OUT ≤ 5.25V
LTC3829
3-Phase, Single Output Synchronous Step-Down DC/DC PLL Fixed 250kHz to 770kHz Frequency, 4.5V ≤ V_IN ≤ 38V,
Controller with Diff Amp and DCR Temp Compensation 0.6V ≤ V_OUT ≤ 5.25V
LTC3855
2-Phase, Dual Output Synchronous Step-Down DC/DC
Controller with Differential Remote Sense
PLL Fixed Frequency 250kHz to 770kHz, 4.5V ≤ V_IN ≤ 38V,
0.6V ≤ V_OUT ≤ 12.5V
LTC3860
Dual, Multiphase, Synchronous Step-Down DC/DC
Controller with Diff Amp and Three-State Output Drive
Operates with Power Blocks, DRMOS Devices or External Drivers/
MOSFETs, 3V ≤ V_IN ≤ 24V, t_ON(MIN) = 20ns
LTC3869/LTC3869-2 2-Phase, Dual Output Synchronous Step-Down DC/DC PLL Fixed Frequency 250kHz to 780kHz, 4V ≤ V_IN ≤ 30V,
Controllers, with Accurate Multiphase Current Matching 0.6V ≤ V_OUT ≤ 12.5V, 4mm × 5mm QFN-28, SSOP-28
LTC3867
Synchronous Step-Down DC/DC Controller with Nonlinear Fast Transient Response, t_ON(MIN) = 65ns, 4V ≤ V_IN ≤ 38V,
Control and Remote Sense
0.6V ≤ V_OUT ≤ 14V, 4mm × 4mm QFN-24
36 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
3866fa
LT 0812 REV A • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2012