Datasheet

LTC3869/LTC3869-2
42
38692fa
For more information www.linear.com/LTC3869
 LINEAR TECHNOLOGY CORPORATION 2011
LT 0413 REV A • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
●
www.linear.com/LTC3869
relaTeD parTs
Typical applicaTion
3.3V/5A, 5V/5A Converter Using Sense Resistors
0.1µF
90.9k
1%
L2
2.2µH
1000pF
1000pF 1000pF
22µF
50V
20k
1%
10k
1%
V
OUT1
3.3V
5A
0.1µF
147k
1%
L2
3.3µH
1000pF
C
OUT2
150µF
20k
1%
15k
1%
122k
1%
V
OUT2
5V
5A
TG1 TG2
BOOST1 BOOST2
SW1 SW2
BG1
BG2
SGND
PGND
FREQ
SENSE1
+
SENSE2
+
RUN2
EXTV
CC
SENSE1
–
SENSE2
–
V
FB1
V
FB2
I
TH1
I
TH2
V
IN
PGOOD INTV
CC
TK/SS1 TK/SS2
V
IN
7V TO
24V
3869 TA02
0.1µF
100pF
0.1µF
LTC3869
MODE/PLLIN
I
LIM
RUN1
4.7µF
+
C
OUT1
220µF
+
10pF15pF
100pF
10Ω
10Ω
10Ω
10Ω
2.2Ω
1µF
D4D3
L1: TDK RLF 7030T-2R2M5R4
L2: TDK ULF10045T-3R3N6R9
C
OUT1
: SANYO 4TPE220MF
C
OUT2
: SANYO 6TPE150MI
8mΩ 8mΩ
M1 M2
Si4816BDYSi4816BDY
PART NUMBER DESCRIPTION COMMENTS
LTC3850/
LTC3850-1/
LTC3850-2
Dual 2-Phase, High Efficiency Synchronous Step-Down DC/DC
Controller, R
SENSE
or DCR Current Sensing and Tracking
Phase-Lockable Fixed 250kHz to 780kHz Frequency,
4V ≤ V
IN
≤ 30V, 0.8V ≤ V
OUT
≤ 5.25V
LTC3861/
LTC3861-1
Dual, Multiphase, Synchronous Step-Down DC/DC Controller with
Differential Amplifier(s) and Tr i -State Output Drive
Operates with Power Blocks, DRMOS Devices or External Drivers/
MOSFETs, 3V ≤ V
IN
≤ 24V
LTC3855 Dual, Multiphase, Synchronous Step-Down DC/DC Controller with
Differential Amplifier and DCR Temperature Compensation
Phase-Lockable Fixed Frequency 250kHz to 770kHz,
4.5V ≤ V
IN
≤ 38V, 0.8V ≤ V
OUT
≤ 12V
LTC3890 Dual, High V
IN
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 Controller
with Differential Amplifier and DCR Temperature Compensation
Phase-Lockable Fixed 250kHz to 770kHz Frequency,
4.5V ≤ V
IN
≤ 38V, 0.8V ≤ V
OUT
≤ 5V
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
LTC3851A/
LTC3851A-1
No R
SENSE
™ Wide V
IN
Range Synchronous Step-Down DC/DC
Controller
PLL Fixed Frequency 250kHz to 750kHz, 4V ≤ V
IN
≤ 38V,
0.8V ≤ V
OUT
≤ 5.25V, MSOP-16E, 3mm × 3mm QFN-16, SSOP-16
LTC3833 Fast Controlled On-Time, High Frequency Synchronous
Step-Down Controller with Differential Amplifier
Up to 2MHz Operating Frequency, 4V ≤ V
IN
≤ 38V,
0.8V ≤ V
OUT
≤ 5.5V, 3mm × 4mm QFN-20, TSSOP-20E