LT3507A
30
3507afa
For more information www.linear.com/LT3507A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
LINEAR TECHNOLOGY CORPORATION 2011
LT 0116 REV A • PRINTED IN USA
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LT3507A
typical application
PART NUMBER DESCRIPTION COMMENTS
LT3507 36V, 2.5MHz Triple (2.4A + 2 × 1.5A) Step-Down DC/DC Converter
with LDO Controller
V
IN(MIN)
= 4V, V
IN(MAX)
= 36V, V
OUT(MIN)
= 0.8V, I
Q
= 7mA,
I
SD
< 1µA, 5mm × 7mm QFN-38 Package
LT1940 Dual 25V, 1.4A (I
OUT
), 1.1MHz, High Efficiency Step-Down DC/DC
Converter
V
IN(MIN)
= 3.3V, V
IN(MAX)
= 25V, V
OUT(MIN)
= 1.20V, I
Q
= 3.8mA,
I
SD
< 30µA, TSSOP16E Package
LT3480 36V with Transient Protection to 60V, 2A (I
OUT
), 2.4MHz, High
Efficiency Step-Down DC/DC Converter with Burst Mode
®
Operation
V
IN(MIN)
= 3.6V, V
IN(MAX)
= 38V, V
OUT(MIN)
= 0.78V, I
Q
= 70µA,
I
SD
< 1µA, 3mm × 3mm DFN-10, MSOP-10E Package
LT3481 34V with Transient Protection to 36V, 2A (I
OUT
), 2.8MHz, High
Efficiency Step-Down DC/DC Converter with Burst Mode Operation
V
IN(MIN)
= 3.6V, V
IN(MAX)
= 34V, V
OUT(MIN)
= 1.26V, I
Q
= 50µA,
I
SD
< 1µA, 3mm × 3mm DFN-10, MSOP-10E Package
LT3493 36V, 1.4A (I
OUT
), 750kHz High Efficiency Step-Down DC/DC Converter V
IN(MIN)
= 3.6V, V
IN(MAX)
= 36V, V
OUT(MIN)
= 0.8V, I
Q
= 1.9mA,
I
SD
< 1µA, 2mm × 3mm DFN-6 Package
LT3500 36V, 40Vmax, 2A, 2.5MHz High Efficiency DC/DC Converter and LDO
Controller
V
IN(MIN)
= 3.6V, V
IN(MAX)
= 36V, V
OUT(MIN)
= 0.8V, I
Q
= 2.5mA,
I
SD
< 10µA, 3mm × 3mm DFN-10 Package
LT3501/LT3510 25V, Dual 3A/2A (I
OUT
), 1.5MHz High Efficiency Step-Down DC/DC
Converter
V
IN(MIN)
= 3.3V, V
IN(MAX)
= 25V, V
OUT(MIN)
= 0.8V, I
Q
= 3.7mA,
I
SD
= 10µA, TSSOP-20E Package
LT3505 36V with Transient Protection to 40V, 1.4A (I
OUT
), 3MHz, High
Efficiency Step-Down DC/DC Converter
V
IN(MIN)
= 3.6V, V
IN(MAX)
= 34V, V
OUT(MIN)
= 0.78V, I
Q
= 2mA,
I
SD
= 2µA, 3mm × 3mm DFN-8, MSOP-8E Package
LT3506/
LT3506A
25V, Dual 1.6A (I
OUT
), 575kHz/1.1MHz High Efficiency Step-Down
DC/DC Converter
V
IN(MIN)
= 3.6V, V
IN(MAX)
= 25V, V
OUT(MIN)
= 0.8V, I
Q
= 3.8mA,
I
SD
= 30µA, TSSOP-16E, 5mm × 4mm DFN-16 Package
LT3508 36V with Transient Protection to 40V, Dual 1.4A (I
OUT
), 3MHz, High
Efficiency Step-Down DC/DC Converter
V
IN(MIN)
= 3.7V, V
IN(MAX)
= 37V, V
OUT(MIN)
= 0.8V, I
Q
= 4.6mA,
I
SD
= 1µA, 4mm × 4mm QFN-24, TSSOP-16E Package
LT3684 34V with Transient Protection to 36V, 2A (I
OUT
), 2.8MHz, High
Efficiency Step-Down DC/DC Converter
V
IN(MIN)
= 3.6V, V
IN(MAX)
= 34V, V
OUT(MIN)
= 1.26V, I
Q
= 850µA,
I
SD
< 1µA, 3 × 3 DFN-10, MSOP-10E Package
LT3685 36V with Transient Protection to 60V, 2A (I
OUT
), 2.4MHz, High
Efficiency Step-Down DC/DC Converter
V
IN(MIN)
= 3.6V, V
IN(MAX)
= 38V, V
OUT(MIN)
= 0.78V, I
Q
= 70µA,
I
SD
< 1µA, 3 × 3 DFN-10, MSOP-10E Package
12V to 5V, 3.3V, 1.8V and 1.6V with 1.5mm Maximum Height
relateD parts
V
IN1
BOOST1 UVLO
OVLO
BOOST3
SW3
FB3
V
C3
TRK/SS3
BIAS
DRIVE
FB4
PGOOD1
PGOOD2
PGOOD3
PGOOD1
PGOOD2
PGOOD3
SW1
FB1
V
C1
TRK/SS1
BOOST2
0.1µF
10µF
33µF
D1
13.3k
1000pF
1.5nF
22.6k
L1 2µH
V
OUT1
1.8V
2A
V
IN
8V TO 16V
V
OUT2
3.3V
1.5A
D1: DIODES, INC. DFLS220L
D2, D3: DIODES, INC. DFLS120L
L1: COOPER SD14-2R0-R
L2, L3: COOPER SD14-4R5-R
Q1: ON SEMI NSS30071MR6T1G
L2 4.5µH
L3 4.5µH
V
IN2
V
IN3
V
INSW
49.9k
49.9k
4.02k
OVLO = 17V
UVLO = 7V
100k
11.3k
V
OUT1
V
OUT2
18.2k
SW2
FB2
V
C2
TRK/SS2
RT/SYNC TRK/SS4
GND
LT3507A
RUN1
RUN2
RUN3
0.1µF
0.1µF
10µF
D2
D3
7.32k
11.3k
SHDN
2000pF
1200pF
1.5nF
1.5nF
41.2k
11.8k
V
OUT2
V
OUT2
V
OUT1
20.0k
20.0k
3507A TA03
31.6k
f
SW
= 1.25MHz
2.2nF
13.3k
100k 100k
V
OUT3
5V
1.4A
V
OUT4
1.6V
0.2A
2.2µF
10µF
61.9k
Q1
