LTC3859AL Datasheet, PDF (44/44 Pages) Linear Technology – Triple Output, Buck/Buck/Boost Synchronous Controller with 28μA Burst Mode IQ

LTC3859AL
Typical Application
High Efficiency Wide Input Range Dual 3.3V/8.5V Converter
V_OUT1
R_A1
68.1k
15pF
R_B1
215k
C_ITH1
820pF
C_ITH1A
150pF
R_ITH1
15k
C_SS1
0.1µF
LTC3859AL
V_FB1
SENSE1^–
SENSE1⁺
I_TH1
PGOOD1
TG1
TRACK/SS1
SW1
FREQ
BOOST1
C1
1nF
100k
C_B1
0.1µF
MTOP1
C1
10µF _L1
3.2µH
R_SENSE1
6mΩ
PLLIN/MODE BG1
MBOT1
V_OUT1
3.3V
5A
C_OUT1
150µF
V_OUT2
R_A2
68.1k
10pF
R_B2
649k
C_ITH2
2.2nF
R_ITH2
15k
C_ITH2A
68pF
SGND
RUN1
RUN2
RUN3
V_FB2
I_TH2
V_BIAS
PGND
INTV_CC
D1
C_BIAS
10µF
C_INT1
4.7µF
D2
C2
10µF
C_SS2
0.1µF
V_OUT3
R_A3
68.1k
OPT
R_B3
499k
C_ITH3
0.01µF
R_ITH3
3.6k
C_ITH3A
820pF
TG2
TRACK/SS2 BOOST2
SW2
BG2
V_FB3
SENSE2⁺
I_TH3
SENSE2^–
C_B2
0.1µF
MTOP2 L2
6.5µH
R_SENSE2
8mΩ
MBOT2
V_OUT2
8.5V
3A
C_OUT2
68µF
C2
1nF
C_SS3
0.1µF
SS3
MTOP1, MTOP2: VISHAY Si7848DP
MBOT1, MBOT2: BSZ097NO4LS
MTOP3: BSC027NO4LS
MBOT3: BSCO1BN04LS
L1: SUMIDA CDEP105-3R2M
L2: WÜRTH 744314650
L3: WÜRTH 744325120
C_OUT1: SANYO 6TPB220ML
C_OUT2: SANYO 4TPE150M
C_IN, C_OUT3: SANYO 50CE220LX
D1, D2: CMDH-4E
D3: BAS140W
V_OUT2
OV3
EXTV_CC
TG3
SW3
BOOST3
BG3
SENSE3^–
SENSE3⁺
3859al TA02
D3
C_B3
0.1µF
C3
1nF
MTOP3 ^L3
1.2µH
R_SENSE2
2mΩ
MBOT3
V_IN
2.5V TO 38V
(START-UP ABOVE 5V)
C_IN
220µF
* V_OUT3 IS 10V WHEN V_IN < 10V,
FOLLOWS V_IN WHEN V_IN > 10V
V_OUT3
10V*
C_OUT3
220µF
Related Parts
PART NUMBER DESCRIPTION
COMMENTS
LTC3786
LTC3787
LTC3826/
LTC3826-1
LTC3890/
LTC3890-1/
LTC3890-2
Low I_Q Synchronous Step-Up DC/DC Controller
4.5V (Down to 2.5V after Start-Up) ≤ V_IN ≤ 38V, V_OUT Up to 60V, I_Q = 55µA
PLL Fixed Frequency 50kHz to 900kHz, 3mm × 3mm QFN-16, MSOP-16E
Low I_Q, Multiphase, Dual Channel Single Output
Synchronous Step-Up DC/DC Controller
4.5V (Down to 2.5V after Start-Up) ≤ V_IN ≤ 38V, V_OUT up to 60V, PLL Fixed
Frequency 50kHz to 900kHz, I_Q = 135µA
Low I_Q, Dual Output 2-Phase Synchronous Step-Down
DC/DC Controllers with 99% Duty Cycle
PLL Fixed Frequency 50kHz to 900kHz, 4V≤ V_IN ≤ 36V, 0.8V ≤ V_OUT ≤ 10V,
I_Q = 30µA
60V, Low I_Q, Dual 2-Phase Synchronous Step-Down DC/DC PLL Fixed Frequency 50kHz to 900kHz, 4V ≤ V_IN ≤ 60V, 0.8V ≤ V_OUT ≤ 24V,
Controller with 99% Duty Cycle
I_Q = 50µA
LTC3891
LTC3864
LTC3789
60V, Low I_Q, Synchronous Step-Down DC/DC Controller
with 99% Duty Cycle
60V, Low I_Q, High Voltage DC/DC Controller with 100%
Duty Cycle
4-Switch High Efficiency Buck-Boost DC/DC Controller
PLL Fixed Frequency 50kHz to 900kHz, 4V ≤ V_IN ≤ 60V, 0.8V ≤ V_OUT ≤ 24V,
I_Q = 50µA
Fixed Frequency 50kHz to 850kHz, 3.5V≤ V_IN ≤ 60V, 0.8V ≤ V_OUT ≤ V_IN,
I_Q = 40µA, MSOP-12E, 3mm × 4mm DFN-12
4V≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 38V
3859alf
44 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 950_F3_o5_r -_m7_o4_r1_e7_{information www.linear.com/3859AL}
[phone] ^● FAX: [phone] ^● www.linear.com/3859AL
LT 0113 • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2013