LT3800
24
3800fc
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2005
LT 0911 REV C • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
24V-48V to –12V 75W Inverting DC/DC Converter with V
IN
UVLO
Effi ciency and Power Loss
I
LOAD
(A)
0.1
40
EFFICIENCY (%)
POWER LOSS (W)
50
60
70
80
100
110
3800 TA04b
90
0
2
4
6
8
12
10
V
IN
= 24V
V
IN
= 48V
V
IN
= 36V LOSS
V
IN
= 36V
PART NUMBER DESCRIPTION COMMENTS
LTC1735 Synchronous Step-Down Controller 4V ≤ V
IN
≤ 36V, 0.8V ≤ V
OUT
≤ 6V, I
OUT
≤ 20A
LTC1778 No R
SENSE
™ Synchronous Step-Down Controller Current Mode Without Using Sense Resistor, 4V ≤ V
IN
≤ 36V
LT
®
1934 Micropower Step-Down Switching Regulator 3.2V ≤ V
IN
≤ 34V, 300mA Switch, ThinSOT™ Package
LT1952 Synchronous Single Switch Forward Converter 25W to 500W Isolated Power Supplies, Small Size, High Effi ciency
LT1976 60V Switching Regulator 3.2V ≤ V
IN
≤ 60V, 1.5A Switch, 16-Lead TSSOP
LT3010 3V to 80V LDO 50mA Output Current, 1.275V ≤ V
OUT
≤ 60V
LT3430/LT3431 3A, 60V Switching Regulators 5.5V ≤ V
IN
≤ 60V, 200kHz, 16-Lead TSSOP
LTC3703 100V Synchronous Step-Down Controller Large 1 Gate Drivers, No R
SENSE
LTC3703-5 60V Synchronous Step-Down Controller Large 1 Gate Drivers, No R
SENSE
LTC3727-1 High V
OUT
2-Phase Dual Step-Down Controller 0.8V ≤ V
OUT
≤ 14V, PLL: 250kHz to 550kHz
LTC3728L 2-Phase, Dual Synchronous Step-Down Controller 550kHz, PLL: 250kHz to 550kHz, 4V ≤ V
IN
≤ 36V
V
IN
NC
SHDN
C
SS
BURST_EN
V
FB
V
C
SENSE
–
BOOST
TG
SW
NC
V
CC
BG
PGND
SENSE
+
LT3800
SGND
C1 1nF
R1 200k
C3
470pF
R8
1M
R3
1M
R7
1M
R6
130k
R4
39k
R5
20k
1%
R2
174k
1%
C2 1µF
16V X7R
C4
100pF
C8
4.7µF
16V
X7R
C5
270µF
16V
SPRAGUE SP
C7
150pF
100V
D2
1N4148
D1
BAS19
C9
56µF
63V
w2
C10
1µF
100V
X7R
w4
C6
1µF
16V
X7R
M1
FDD3570
M2
FDD3570
L1: COEV MGPWL-00099
V
IN
24V TO 48V
V
OUT
–12V
75W
R
S
0.01Ω
L1
15µH
DS1
B180
2N3906
3800 TA04a
+
+
