LTC3865-1_15 Datasheet, PDF (38/38 Pages) Linear Technology – Dual, 2-Phase Synchronous DC/DC Controller with Pin Selectable Outputs

LTC3865/LTC3865-1
TYPICAL APPLICATION
3.3μF
50V
2.2Ω
C_IN2
1μF
V_OUT1
3.6V
10A
0.004Ω
HAT2266H
L1
2.2μH
4.7μF _D3
CMDSH-3
0.1μF
HAT2266H
PLLIN
400kHz
100Ω
V_IN PGOOD EXTV_CC INTV_CC
TG1
TG2
BOOST1
SW1
BG1
LTC3865
BOOST2
SW2
BG2
MODE/PLLIN
PGND
I_LIM
SENSE1⁺
FREQ
SENSE2⁺
49.9k
1%
+ C_OUT1
220μF ^10k
s2
1%
1nF
100Ω
1800pF
17.8k
1%
100pF
RUN1
SENSE1^–
VID11
VID12
V_OSENSE1
I_TH1
TK/SS1
SGND
RUN2
SENSE2^–
VID21
VID22
V_OSENSE2
I_TH2
TK/SS2
0.1μF
0.1μF
3.3μF
50V
D4
CMDSH-3
0.1μF
HAT2266H
+ C_IN1
22μF
50V
V_IN
7V TO 36V
HAT2266H
L2
1.2μH
0.004Ω
1nF
2200pF
121k
14.7k
1%
100Ω
100Ω
23.2k
1%
+
100pF
10k
1%
V_OUT2
2V
10A
C_OUT2
220μF
s2
C_OUT1, C_OUT2: SANYO 4TPE 220μF
L1: TOKO FDA1055-2R2M
L2: TOKO FD1055-1R2M
3865 F18
Figure 18. High V_IN, 3.6V/10A, 2V/10A Converter With External Sense Resistors Synchronized at 400kHz
RELATED PARTS
PART NUMBER DESCRIPTION
COMMENTS
LTC3850/LTC3850-1 Dual 2-Phase, High Efficiency Synchronous Step-Down DC/DC Phase-Lockable Fixed 250kHz to 780kHz Frequency,
LTC3850-2
Controllers, R_SENSE or DCR Current Sensing and Tracking
4V ≤ V_IN ≤ 30V, 0.8V ≤ V_OUT ≤ 5.25V
LTC3855
Dual, Multiphase Synchronous Step-Down DC/DC Controller Phase-Lockable Fixed 250kHz to 770kHz Frequency,
with Diffamp and DCR Temperature Compensation
4.5V ≤ V_IN ≤ 38V, t_ON(MIN) = 90ns
LTC3860
Dual, Multiphase Synchronous Step-Down DC/DC Controller Operates with Power Blocks, DRMOS Devices or External
with Diffamp and Three-State Output Drive
MOSFETs, 3V ≤ V_IN ≤ 24V, t_ON(MIN) = 20ns
LTC3853
Triple Output, Multiphase Synchronous Step-Down DC/DC
Controller, R_SENSE or DCR Current Sensing and Tracking
Phase-Lockable Fixed 250kHz to 750kHz Frequency,
4V ≤ V_IN ≤ 24V, V_OUT3 Up to 13.5V
LTC3854
Small Footprint Wide V_IN Range Synchronous Step-Down
DC/DC Controller, R_SENSE or DCR Current Sensing
Fixed 400kHz Operating Frequency 4.5V ≤ V_IN ≤ 38V,
0.8V ≤ V_OUT ≤ 5.25V, 2mm × 3mm QFN-12, MSOP-12
LTC3878/LTC3879 No R_SENSE Constant On-Time Synchronous Step-Down
DC/DC Controller, No R_SENSE Required
Very Fast Transient Response, t_ON(MIN) = 43ns, 4V ≤ V_IN ≤ 38V,
0.8V ≤ V_OUT ≤ 0.9V_IN, SSOP-16, MSOP-16E, 3mm × 3mm QFN-16
LTC3775
High Frequency, Synchronous Voltage Mode Step-Down
DC/DC Controller
Fast Transient Response, t_ON(MIN) = 30ns, 4V ≤ V_IN ≤ 38V,
0.6V ≤ V_OUT ≤ 0.8V_IN, MSOP-16E, 3mm × 3mm QFN-16
38 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
3865fb
LT 0810 REV B • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2010