LTC3863
38
3863fa
For more information www.linear.com/3863
LINEAR TECHNOLOGY CORPORATION 2013
LT 0714 • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/3863
relaTeD parTs
Typical applicaTion
PART NUMBER DESCRIPTION COMMENTS
LTC3864 Low I
Q
, High Voltage Step-Down DC/DC Controller
with 100% Duty Cycle
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
LTC3891 60V, Low I
Q
, Synchronous Step-Down DC/DC
Controller
PLL Fixed Frequency 50kHz to 900kHz, 4V ≤ V
IN
≤ 60V, 0.8V ≤ V
OUT
≤ 24V,
I
Q
= 50µA
LTC3890/LTC3890-1
LTC3890-2/LTC3890-3
60V, Low I
Q
, Dual 2-Phase Synchronous
Step-Down DC/DC Controller
PLL Fixed Frequency 50kHz to 900kHz, 4V ≤ V
IN
≤ 60V, 0.8V ≤ V
OUT
≤ 24V,
I
Q
= 50µA
LTC3630 High Efficiency, 65V, 500mA Synchronous
Step-Down Regulator
4V ≤ V
IN
≤ 65V, 0.8V ≤ V
OUT
≤ V
IN
, I
Q
= 12µA, 3mm × 5mm DFN-16 and
MSOP-16E
LTC3834/LTC3834-1
LTC3835/LTC3835-1
Low I
Q
, Single Output Synchronous Step-Down
DC/DC Controllers with 99% Duty Cycle
PLL Fixed Frequency 140kHz to 650kHz, 4V ≤ V
IN
≤ 36V, 0.8V ≤ V
OUT
≤ 10V,
I
Q
= 30µA/80µA
LT3758A High Input Voltage, Boost, Flyback, SEPIC and
Inverting Controller
5.5V ≤ V
IN
≤ 100V, Positive or Negative V
OUT
, 3mm × 3mm DFN-10 and
MSOP-10E
LTC3826/LTC3826-1 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
LTC3859AL Low I
Q
, Triple Output Buck/Buck/Boost
Synchronous DC/DC Controller
All Outputs Remain in Regulation Through Cold Crank 2.5V ≤ V
IN
≤ 38V,
V
OUT(BUCKS)
Up to 24V, V
OUT(BOOST)
Up to 60V, I
Q
= 28µA
Efficiency
Gain/Phase
Figure 16. 12V to 40V Input, –150V/40mA Output, 320kHz Inverting Converter
320kHz
39mΩ
L1
15µH
Q1
D1
CAP
0.47µF
PGND
LTC3863
3863 F16a
SS
ITH
FREQ
SGND
RUN
V
IN
PLLIN/MODE
SENSE
GATE
V
FBN
V
FB
845k
52.3k
1M
V
OUT
–150V
40mA
10.7k
C
IN1
: CDE AFK686M63G24T-F
C
IN2
: MURATA GRM32ER71H106H
C
OUT1
: TDK CGA8P3X7T2E105K/SOFT
C
OUT3
: LELON VEJ-470M2DTR-1616
D1: ON SEMI MBRS3201T3G
L1: TOKO 1217AS-H-150M
Q1: VISHAY SI7119
V
IN
12V TO 40V
C
IN3
68µF
63V
C
OUT1
1µF
250V
×2
C
IN2
10µF
50V
×2
C
OUT3
47µF
200V
180pF
0.1µF
1.8pF
3.3pF
1M
+
+
LOAD CURRENT (A)
0.001
40
EFFICIENCY (%)
POWER LOSS (W)
60
90
80
0.01 0.1
3863 F16b
20
30
50
70
10
0
4
6
9
8
2
3
5
7
1
0
EFFICIENCY
POWER LOSS
V
IN
= 24V
V
OUT
= –150V
PULSE-SKIPPING MODE
Burst Mode OPERATION
FREQUENCY (Hz)
0.1
0
EFFICIENCY (%)
PHASE (DEG)
10
20
1 10 100
–10
–20
40
30
–5
5
15
–15
35
25
15
45
75
–15
–45
135
105
0
30
60
–30
120
90
PHASE
GAIN
V
IN
= 24V
V
OUT
= –150V
Gain/Phase Measurements Taken with OMICRON Lab Bode 100 Vector Network Analyzer.
