LT1952EGN datasheet(2/24 Pages) LINER

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LT1952

1952f

GN PACKAGE

16-LEAD PLASTIC SSOP

TOP VIEW

COMP

ROSC

SYNC

SS_MAXDC

VREF

SD_VSEC

GND

SOUT

VIN

OUT

PGND

DELAY

ISENSE

BLANK

VIN (Note 8) ............................................... –0.3V to 25V

SYNC, SS_MAXDC, SD_VSEC, ISENSE,

OC, COMP, BLANK, DELAY ......................... –0.3V to 6V

FB ................................................................ –0.3V to 3V

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

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

Operating Junction Temperature Range

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

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

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

ORDER PART

NUMBER

GN PART

MARKING

TJMAX = 125°C, θJA = 110°C/W, θJC = 40°C/W

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

1952E

1952I

LT1952EGN

LT1952IGN

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 = 178k, SYNC = 0V, SS_MAXDC = VREF, VREF

= 0.1µF, SD_VSEC = 2V, BLANK = 40k, DELAY = 40k, ISENSE = 0V, OC = 0V, OUT = 1nF, VIN = 15V, SOUT = open, unless otherwise specified.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

PWM CONTROLLER

Operational Input Voltage

I(VREF) = 0µA

● VIN OFF

VIN Quiescent Current

I(VREF) = 0µA, FB = 0V, ISENSE = OC = Open

5.2

6.5

VIN Startup Current

FB = 0V, SS_MAXDC = 0V (Notes 4, 9)

●

460

700

µA

VIN Shutdown Current

SD_VSEC = 0V

240

350

µA

SD_VSEC Threshold

10V < VIN < 25V

●

1.261

1.32

1.379

SD_VSEC (ON) Current

SD_VSEC = SD_VSEC Threshold + 100mV

µA

SD_VSEC (OFF) Current

SD_VSEC = SD_VSEC Threshold – 100mV

9.5

11.2

12.9

µA

VIN ON

●

12.75

14.25

15.75

VIN OFF

●

8.0

8.75

9.25

VIN HYSTERESIS

●

3.75

5.5

6.75

VREF

Output Voltage

I(VREF) = 0µA

●

2.425

2.5

2.575

Line Regulation

I(VREF) = 0µA, 10V < VIN < 25V

Load Regulation

0µA < I(VREF) < 2.5mA

OSCILLATOR

Frequency: fOSC

ROSC = 178k, FB = 1V

●

165

200

240

kHz

Minimum Programmable fOSC

ROSC = 365k

100

120

kHz

Maximum Programmable fOSC

ROSC = 64.9k, COMP = 2.5V, SD_VSEC = 2.64V

440

500

560

kHz

SYNC Input Resistance

kΩ

SYNC Switching Threshold

FB = 1V

1.5

2.2

SYNC Frequency/fOSC

FB = 1V (Note 7)

1.25

1.5

fOSC Line Reg

FB = 1V, ROSC = 178k; 10V < VIN < 25V,

0.05

0.33

%/V

SS_MAXDC = 1.84V

VROSC

ROSC Pin voltage

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