LT1942 Ver la hoja de datos (PDF) - Linear Technology
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LT1942 Datasheet PDF : 16 Pages
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LT1942
ABSOLUTE AXI U RATI GS
(Note 1)
VCC Voltage............................................................. 16V
SW1, SW2, SW3 Voltage .......................... –0.4V to 36V
SW4 .......................................................... –0.4V to 45V
FB1, FB3 Voltage ................................................... 2.5V
FB4 Voltage ....................................................... 400mV
NFB2 Voltage ................................................... –200mV
SHDN Voltage ......................................................... 10V
CTRL4 Voltage ........................................................ 16V
SS1, SS4 Voltage .................................................. 1.5V
Current Into D2 ......................................................... 1A
D2 Voltage ............................................................ –36V
Current Out of D3 ..................................................... 1A
D3 Voltage .............................................................. 36V
Current Out of D4 ..................................................... 4A
D4 Voltage .............................................................. 45V
LED1, LED2 Voltage ............................................... 45V
Current Into LED1, LED2 ..................................... 35mA
PGOOD Voltage ...................................................... 16V
VOUT3 Voltage ......................................................... 36V
CT Current ........................................................... ±1mA
Maximum Junction Temperature ......................... 125°C
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 125°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
24 23 22 21 20 19
PGND23 1
SW3 2
D3 3
VOUT3 4
FB3 5
NFB2 6
18 LED1
17 LED2
16 D4
25
15 FB4
14 FB1
13 PGOOD
7 8 9 10 11 12
ORDER PART
NUMBER
LT1942EUF
UF PART
MARKING
1942
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 37°C/W, θJC = 4.3°C/W
EXPOSED PAD (PIN 25) IS SGND
(MUST BE SOLDERED TO PCB)
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V, VSHDN = VIN, unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
Quiescent Current
Input Voltage Range
AVDD Feedback Voltage
AVDD Feedback Pin Bias Current (FB1)
AVDD Feedback Voltage for Power Good Signal
VOFF Feedback Voltage
VOFF Feedback Pin Bias Current (NFB2)
VON Feedback Voltage
VON Feedback Pin Bias Current (FB3)
LED Feedback Voltage
LED Feedback Pin Bias Current (FB4)
VSHDN = 3.3V, VCTRL4 = 0V, Not Switching
VSHDN = VCTRL4 = 0V, In Shutdown
VCC Pin
FB1 Pin
●
7
10
mA
●
0
1
µA
● 2.6
16
V
● 1.225 1.25 1.275
V
FB1 Pin (Note 3)
15
60
nA
FB1 Pin Voltage as a Percent of Nominal Voltage ● 95
97
100
%
NFB2 Pin
–160 –150 –140
mV
NFB2 Pin (Note 3)
25
60
nA
FB3 Pin
1.225 1.25 1.275
V
FB3 Pin (Note 3)
25
60
nA
FB4 Pin, VCTRL4 = 3.3V
FB4 Pin (Note 3)
● 190
200
210
mV
20
60
µA
LED Feedback Voltage with Dimming
FB4 Pin, VCTRL4 = 1V
85
95
105
mV
1942fb
2
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