LT3797
36
3797fa
For more information www.linear.com/LT3797
LINEAR TECHNOLOGY CORPORATION 2013
LT 1116 REV A • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LT3797
relaTeD parTs
Typical applicaTion
PART NUMBER DESCRIPTION COMMENTS
LT3476 Quad Output 1.5A, 2MHz High Current LED Driver with
1000:1 Dimming
V
IN
: 2.8V to 16V, V
OUT(MAX)
= 36V, PWM Dimming =1000:1,
I
SD
< 10μA, 5mm × 7mm QFN-10 Package
LT3492 60V, 2.1MHz 3-Channel (I
LED
= 600mA) Full-Featured
LED Driver
V
IN
: 3V to 30V (40V
MAX
), V
OUT(MAX)
= 45V, PWM Dimming = 3000:1,
I
SD
< 1μA, 4mm × 5mm QFN-28 and TSSOP Package
LT3496 45V, 2.1MHz 3-Channel (I
LED
= 750mA) Full-Featured
LED Driver
V
IN
: 3V to 30V (40V
MAX
), V
OUT(MAX)
= 45V, PWM Dimming = 3000:1,
I
SD
< 1μA, 4mm × 5mm QFN-28 and TSSOP Package
LT3795 110V LED Controller with Spread Spectrum Frequency
Modulation
V
IN
: 4.5V to 110V, V
OUT(MAX)
= 110V, I
SD
< 10μA, TSSOP-28E Package
LT3595 45V, 2MHz 16-Channel Full-Featured LED Driver V
IN
: 4.5V to 55V, V
OUT(MAX)
= 45V PWM Dimming = 5000:1, I
SD
< 1μA,
5mm × 9mm QFN-56 Package
LT3596 60V Step-Down LED Driver V
IN
: 6V to 60V, PWM Dimming = 10000:1, I
SD
< 1μA,
5mm × 8mm QFN-52 Package
LT3598 44V
, 1.5A, 2.5MHz Boost 6-Channel LED Driver V
IN
: 3V to 30V (40V
MAX
), V
OUT(MAX)
= 44V, PWM Dimming = 1000:1,
I
SD
< 1μA, 4mm × 4mm QFN-24 Package
LT3599 2A Boost Converter with Internal 4-String 150mA LED
Ballaster
V
IN
: 3V to 30V, V
OUT(MAX)
= 44V, PWM Dimming = 1000:1, I
SD
< 1μA,
5mm × 5mm QFN-32 and TSSOP-28 Packages
LT3754
16-Channel
× 50mA LED Driver with 60V Boost
Controller and PWM Dimming
V
IN
: 6V to 40V, V
OUT(MAX)
= 45V, PWM Dimming = 3000:1, I
SD
< 1μA,
5mm × 5mm QFN-32 Package
Dual Buck Mode LED Driver with a Boost Pre-Regulator
Efficiency and Output
Current vs V
IN
CTRL2-3OVLO
V
REF
357k
75k
V
IN
RT SYNC SW1 BOOST INTV
CC
GND VC1-3
FBH1-3
SW2
35.7k
400kHz
0.1µF
L4
47µH
PWM2-3 F LT 1-3SS1-3
C
OUT1
4.7µF
50V
×4
C
OUT2
4.7µF
50V
×2
V
OUT1
REGULATED AT 20V WHEN V
IN
< 20V
FOLLOWS V
IN
WHEN V
IN
> 20V
C
IN4
1µF
0.1µF
10µF
3797 TA08
10nF
4.7k
49.9k
49.9k
ISP2-3
EN/UVLO
V
IN
ISN2-3
TG1-3
GATE1 SENSEP1 SENSEN1 GATE2SENSEP2SENSEN2ISP1 ISN1
LT3797
GATE3 SENSEP3 SENSEN3
0.25Ω
0.068Ω0.068Ω
1A
16V
1A
16V
C
OUT3
4.7µF
50V
×2
M5M3
0.25Ω
D1
L1
10µH
M4M2M1
TG3TG2
FBH3
20k274k
FBH2
FBH1
274k20k
ISN3
LED1+
D3
D2
L3
22µH
L2
22µH
20k
ISP3
ISN2
ISP2
0.012Ω
PWM1
V
REF
CTRL1
C
IN
4.7µF
50V
×2
V
IN
2.5V TO 40V
(60V TRANSIENT,
41V INTERNAL
OVLO PROTECTION)
301k
TG1
N/C
0.1µF
(OPTIONAL)
0.1µF
(OPTIONAL)
0.1µF
(OPTIONAL)
D1: VISHAY SILICONIX 12CWQ06FN
D2, D3: VISHAY SILICONIX 30BQ060
L1: COILTRONICS HC9-100
L2, L3: WURTH 74437349220
L4: COILTRONICS SD25-470
M1: INFINEON BSC110N06NS3-G
M2, M4: VISHAY SILICONIX Si4850EY
M3, M5: VISHAY SILICONIX Si7415DN
V
IN
(V)
0
60
EFFICIENCY (%)
70
80
90
100
0.2
0.6
1.0
1.4
1.8
5 10 15 20
25 30 35 40
PWM1-3 = 2V
OUTPUT CURRENT
EFFICIENCY
