Datasheet

LT3506/LT3506A
19
3506afc
1.8V and 1.2V Outputs with Sequencing
1.8V and ±5V Outputs
V
IN
4.5V TO 21V
3506 TA02
68µF47µF
22µF
0.22µF 0.22µF
32.4k
18.7k
16.2k
L2
3.3µH
L1
4.7µH
V
OUT2
1.2V
1.5A
V
OUT1
1.8V
1.5A
15k
4.7nF
1500pF 1000pF
BOOST1
SW1
FB1
V
C1
RUN/SS1
RUN/SS2
PGOOD2
BOOST2
SW2
FB2
V
C2
PGOOD1
LT3506
V
IN2
V
IN1
GND
OUTPUT CURRENTS CAN INCREASE TO 1.6A WHEN V
IN
>12V.D1, D2: ON SEMICONDUCTOR MBRS230LT3
D3: BAT-54A
L1: COILCRAFT MSS6122-472
L2: TDK SLF7028-3R3M
PGOOD
D1
D2
D3a
D3b
100k
20k15k
V
IN
7V TO 25V
3506 TA03
22µF
2.2nF
47µF
22µF
22µF
0.22µF 0.22µF
2.2µF
13.3k
18.7k
69.8k
L1
4.7µH
V
OUT2
5V
0.6A
V
OUT1
1.8V
1.5A
15k
47k
15k
15k
100k
4.7nF
BOOST1
SW1
FB1
V
C1
RUN/SS1
PGOOD2
PGOOD1
BOOST2
SW2
FB2
V
C2
RUN/SS2
LT3506
V
IN2
V
IN1
GND
L1: COILCRAFT MSS6122-472
L2: COILTRONICS CTX5-1A
I
OUT3
SHOULD NEVER EXCEED 1/2 OF I
OUT2
.
SEE DESIGN NOTE 100 FOR DETAILS ON
GENERATING DUAL OUTPUTS USING A BUCK
REGULATOR.
D1: ON SEMICONDUCTOR MBRS230LT3
D2: ON SEMICONDUCTOR MBRM130LT3
D3: BAT-54A
D4: ON SEMICONDUCTOR MBR0530
PGOOD
D1 D2
D3a D3b
V
OUT2
L2
4.7
µH
V
OUT3
–5V
0.3A
D4
1500pF 1500pF
TYPICAL APPLICATIONS