LT1942EUF datasheet(2/16 Pages) LINER

2 / 16 page

LT1942

1942fa

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/

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

ORDER PART

NUMBER

(Note 1)

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

Consult LTC Marketing for parts specified with wider operating temperature ranges.

LT1942EUF

TJMAX = 125°C, θJA = 37°C/W, θJC = 4.3°C/W

EXPOSED PAD (PIN 25) IS SGND

(MUST BE SOLDERED TO PCB)

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

VSHDN = 3.3V, VCTRL4 = 0V, Not Switching

●

710

VSHDN = VCTRL4 = 0V, In Shutdown

●

µA

Input Voltage Range

VCC Pin

●

2.6

AVDD Feedback Voltage

FB1 Pin

●

1.225

1.25

1.275

AVDD Feedback Pin Bias Current (FB1)

FB1 Pin (Note 3)

AVDD Feedback Voltage for Power Good Signal

FB1 Pin Voltage as a Percent of Nominal Voltage

●

100

VOFF Feedback Voltage

NFB2 Pin

–160

–150

–140

VOFF Feedback Pin Bias Current (NFB2)

NFB2 Pin (Note 3)

VON Feedback Voltage

FB3 Pin

1.225

1.25

1.275

VON Feedback Pin Bias Current (FB3)

FB3 Pin (Note 3)

LED Feedback Voltage

FB4 Pin, VCTRL4 = 3.3V

●

190

200

210

LED Feedback Pin Bias Current (FB4)

FB4 Pin (Note 3)

µA

LED Feedback Voltage with Dimming

FB4 Pin, VCTRL4 = 1V

105

ELECTRICAL CHARACTERISTICS

24 23 22 21 20 19

TOP VIEW

UF PACKAGE

24-LEAD (4mm

× 4mm) PLASTIC QFN

10 11 12

PGND23

SW3

VOUT3

FB3

NFB2

LED1

LED2

FB4

FB1

PGOOD

UF PART

MARKING

1942

LT1942EUF 数据表(PDF) 2 Page - Linear Technology

LT1942EUF 数据表(HTML) 2 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

数据表下载