LTC3869 Datasheet, PDF (40/40 Pages) Linear Technology – Dual, 2-Phase Synchronous Step-Down DC/DC Controllers

LTC3869/LTC3869-2
TYPICAL APPLICATIONS
3.3V/5A, 5V/5A Converter Using Sense Resistors
2.2Ω
1µF
V_IN
22µF
50V
7V TO
24V
Si4816BDY
M1
L2
2.2µH
4.7µF
0.1µF
D3
V_IN PGOOD INTV_CC
D4
TG1
TG2
0.1µF
BOOST1
BOOST2
SW1
SW2
BG1 ^LTC3869
BG2
Si4816BDY
M2
L2
3.3µH
8mΩ
15pF
10Ω
1000pF
10Ω
MODE/PLLIN
I_LIM
SENSE1⁺
PGND
FREQ
SENSE2⁺
SENSE1^–
RUN1
SENSE2^–
RUN2
10Ω
1000pF
10Ω
8mΩ
10pF
V_OUT1
3.3V
5A
+
90.9k
1%
C_OUT1
220µF
20k
1%
1000pF
10k 100pF
1%
V_FB1
I_TH1
TK/SS1
SGND
EXTV_CC
V_FB2
I_TH2
TK/SS2
0.1µF
0.1µF
147k
122k
1000pF
15k
100pF
1%
20k
+
1% ^1%
1%
V_OUT2
5V
5A
C_OUT2
150µF
L1: TDK RLF 7030T-2R2M5R4
L2: TDK ULF10045T-3R3N6R9
C_OUT1: SANYO 4TPE220MF
C_OUT2: SANYO 6TPE150MI
3869 TA02
RELATED PARTS
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
LTC3860
LTC3855
LTC3890
LTC3856
LTC3853
LTC3851A/
LTC3851A-1
LTC3833
Dual, Multiphase, Synchronous Step-Down DC/DC Controller with Operates with Power Blocks, DRMOS Devices or External Drivers/
Differential Amplifier and Tri-State Output Drive
MOSFETs, 3V ≤ V_IN ≤ 24V, t_ON(MIN) = 20ns
Dual, Multiphase, Synchronous Step-Down DC/DC Controller with Phase-Lockable Fixed Frequency 250kHz to 770kHz,
Differential Amplifier and DCR Temperature Compensation
4.5V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 12V
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
2-Phase, Single Output Synchronous Step-Down DC/DC Controller Phase-Lockable Fixed 250kHz to 770kHz Frequency,
with Differential Amplifier and DCR Temperature Compensation
4.5V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 5V
Triple Output, Multiphase Synchronous Step-Down DC/DC Controller, Phase-Lockable Fixed 250kHz to 750kHz Frequency,
R_SENSE or DCR Current Sensing and Tracking
4V ≤ V_IN ≤ 24V, V_OUT3 Up to 13.5V
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
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
40 LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
3869f
LT 0211 • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2011