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LT1950

1950fa

ORDER PART

NUMBER

GN PART MARKING

TJMAX = 125°C, θJA = 110°C/W,

θJC (PIN 8) = 30°C/W

1950E

1950I

LT1950EGN

LT1950IGN

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

(Note 1)

ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. COMP = open, FB = 1.4V, ROSC = 249k, SYNC = 0V, SLOPE = open, VREF

= 0.1µF, SHDN = VIN, BLANK = 0V, ISENSE = 0V, VIN2 = 15V, GATE = 1nF, BOOST = open, VIN = 15V, VSEC = 0V, unless otherwise

specified.

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

TOP VIEW

GN PACKAGE

16-LEAD NARROW PLASTIC SSOP

COMP

ROSC

SYNC

SLOPE

VREF

SHDN

GND

VSEC

VIN

BOOST

PGND

GATE

VIN2

ISENSE

BLANK

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

PWM Controller

Operating Input Voltage

IVREF = 0µA

●

3.0

Minimum Start-Up Voltage

IVREF = 0µA

●

2.6

3.0

VIN Quiescent Current

IVREF = 0µA, FB = 1V, ISENSE = 0.2V

2.3

3.0

VIN Shutdown Current

SHDN = 0V

µA

Shutdown Threshold

3V < VIN < 25V

●

1.261

1.32

1.379

Shutdown Pin Current

SHDN = 70mV Above Threshold

–7

–10

–13

µA

Shutdown Pin Current Hysteresis

SHDN = 100mV Below Threshold

µA

VIN2 Quiescent Current

I(VREF) = 0µA, FB = 1V, ISENSE = 0.2V

1.7

2.5

VIN2 Shutdown Current

SHDN = 0V, VIN2 = 2.7V (Boost Diode from VIN = 3V)

500

700

µA

VREF (External Output)

Output Voltage

IVREF = 0µA

●

2.425

2.500

2.575

Line Regulation

IVREF = 0µA, 3V < VIN < 25V

Load Regulation

0µA < IVREF < 2.5mA

Oscillator

Frequency: fOSC

ROSC = 249k, FB = 1V

●

170

200

230

kHz

Minimum Programmable fOSC

ROSC = 499k

100

115

kHz

Maximum Programmable fOSC

ROSC = 90.9k

440

500

560

kHz

SYNC Input Resistance

kΩ

SYNC Switching Threshold

1.5

2.2

SYNC Frequency/fOSC

(ROSC = 249k, fOSC =200kHz), FB = 1V (Note 7)

1.25

1.5

fOSC Line Reg

3V < VIN < 25V

0.05

0.15

%/V

9.5V < VIN2 < 25V

0.05

0.25

%/V

VROSC

BOOST ....................................................... –0.3V to 35V

VIN, VIN2, SHDN ......................................... –0.3V to 25V

FB, SYNC, VSEC ........................................... –0.3V to 6V

COMP, BLANK .......................................... –0.3V to 3.5V

SLOPE ...................................................... –0.3V to 2.5V

ISENSE ......................................................... –0.3V to 1V

ROSC .................................................................... –50µA

VREF .................................................................... –10mA

Operating Junction Temperature Range

LT1950EGN/LT1950IGN (Notes 2, 5) ... – 40°C to 125°C

Storage Temperature Range ..................–65°C to 150°C

Lead Temperature (Soldering, 10 sec).................. 300°C

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