Datasheet

2
LT3466
3466fa
Input Voltage (V
IN
) ................................................... 24V
SW1, SW2 Voltages ................................................ 44V
V
OUT1
, V
OUT2
Voltages ............................................. 44V
CTRL1, CTRL2 Voltages ........................................... 24V
FB1, FB2, R
T
Voltages ................................................ 2V
Operating Temperature Range (Note 2) ... –40°C to 85°C
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
T
JMAX
= 125°C, θ
JA
= 43°C/W, θ
JC
= 2.96°C/W
EXPOSED PAD (PIN 11) IS GND
MUST BE SOLDERED TO PCB
ORDER PART
NUMBER
DD PART MARKING
LBBH
LT3466EDD
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW
11
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
2
1
FB1
CTRL1
R
T
CTRL2
FB2
V
OUT1
SW1
V
IN
SW2
V
OUT2
(Note 1)
Maximum Junction Temperature ......................... 125°C
Storage Temperature Range
DFN .................................................. –65°C to 125°C
TSSOP .............................................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec, TSSOP)..... 300°C
ORDER PART
NUMBER
FE PART MARKING
3466EFE
LT3466EFE
FE PACKAGE
16-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
GND
NC
V
OUT1
SW1
V
IN
SW2
V
OUT2
GND
GND
FB1
CTRL1
NC
R
T
CTRL2
FB2
GND
17
T
JMAX
= 125°C, θ
JA
= 38°C/W, θ
JC(PAD)
= 10°C/W
EXPOSED PAD (PIN 17) IS GND
MUST BE SOLDERED TO PCB
ELECTRICAL CHARACTERISTICS
The ● denotes specifications that apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. V
IN
= 3V, V
CTRL1
= 3V, V
CTRL2
= 3V, unless otherwise specified.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Operating Voltage 2.7 V
Maximum Operating Voltage 24 V
FB1 Voltage ● 192 200 208 mV
FB2 Voltage ● 192 200 208 mV
Offset Voltage (V
OS
) Between FB1 and FB2 Voltages V
OS
= |FB1 – FB2| 0 1.5 7.5 mV
FB1 Pin Bias Current V
FB1
= 0.2V (Note 3) 10 50 nA
FB2 Pin Bias Current V
FB2
= 0.2V (Note 3) 10 50 nA
Quiescent Current V
FB1
= V
FB2
= 0.3V 5 7.5 mA
CTRL1 = CTRL2 = 0V 16 25 µA
Switching Frequency R
T
= 48.7k 0.8 1 1.2 MHz
Oscillator Frequency Range (Note 4) 200 2000 kHz
Nominal R
T
Pin Voltage R
T
= 48.7k 0.54 V
Maximum Duty Cycle R
T
= 48.7k ● 90 96 %
R
T
= 20.5k 92 %
R
T
= 267k 99 %