LTC1627CS8 datasheet(2/16 Pages) LINER

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LTC1627

TJMAX = 125°C, θJA = 110°C/ W

ORDER PART

NUMBER

ABSOLUTE MAXIMUM RATINGS

PACKAGE/ORDER INFORMATION

S8 PART MARKING

TOP VIEW

SYNC/FCB

VDR

VIN

ITH

RUN/SS

VFB

GND

S8 PACKAGE

8-LEAD PLASTIC SO

Consult factory for Military grade parts.

(Note 1)

Input Supply Voltage ................................ – 0.3V to 10V

Driver Supply Voltage (VIN – VDR) ........... – 0.3V to 10V

ITH Voltage .................................................. –0.3V to 5V

Run/SS, VFB Voltages ................................ –0.3V to VIN

Sync/FCB Voltage ...................................... – 0.3V to VIN

VDR Voltage (VIN ≤ 5V) ............................... –5V to 0.3V

P-Channel Switch Source Current (DC) .............. 800mA

N-Channel Switch Sink Current (DC) .................. 800mA

Peak SW Sink and Source Current.......................... 1.5A

Operating Ambient Temperature Range

Commercial ............................................ 0

°C to 70°C

Industrial ........................................... – 40

°C to 85°C

Junction Temperature (Note 2) ............................. 125

°C

Storage Temperature Range ................. – 65

°C to 150°C

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

°C

1627

1627I

TA = 25°C, VIN = 5V unless otherwise specified.

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IVFB

Feedback Current

(Note 3)

VFB

Regulated Feedback Voltage

(Note 3)

0.788

0.80

0.812

∆VOVL

∆Output Overvoltage Lockout

∆VOVL = VOVL – VFB

110

∆VFB

Reference Voltage Line Regulation

VIN = 2.8V to 8.5V (Note 3)

0.002

0.01

%/V

VLOADREG

Output Voltage Load Regulation

ITH Sinking 2µA (Note 3)

0.5

0.8

ITH Sourcing 2µA (Note 3)

– 0.5

– 0.8

Input DC Bias Current

(Note 4)

Synchronized

VIN = 8.5V, VOUT = 3.3V, Frequency = 525kHz

450

µA

Burst Mode Operation

VITH = 0V, VIN = 8.5V, VSYNC/FCB = Open

200

320

µA

Shutdown

VRUN/SS = 0V, 2.65V < VIN < 8.5V

µA

Shutdown

VRUN/SS = 0V, VIN < 2.65V

µA

VRUN/SS

Run/SS Threshold

0.4

0.7

1.0

IRUN/SS

Soft-Start Current Source

VRUN/SS = 0V

1.2

2.25

3.3

µA

VSYNC/FCB

Auxiliary Feedback Threshold

VSYNC/FCB Ramping Negative

0.755

0.8

0.835

ISYNC/FCB

Auxiliary Feedback Current

VSYNC/FCB = 0V

0.5

1.5

2.5

µA

fOSC

Oscillator Frequency

VFB = 0.8V

315

350

385

kHz

VFB = 0V

kHz

VUVLO

Undervoltage Lockout

VIN Ramping Down from 3V

2.4

2.50

2.65

VIN Ramping Up from 0V

2.65

2.80

RPFET

RDS(ON) of P-Channel FET

(VIN – VDR) = 5V, ISW = 100mA

0.5

0.7

Ω

RNFET

RDS(ON) of N-Channel FET

ISW = – 100mA

0.6

0.8

Ω

ILSW

SW Leakage

VRUN/SS = 0V

±10

±1000

The q denotes specifications which apply over the full operating

temperature range.

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formula:

TJ = TA + (PD • 110°C/W)

Note 3: The LTC1627 is tested in a feedback loop that servos VFB to the

balance point for the error amplifier (VITH = 0.8V).

Note 4: Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency.

LTC1627CS8

LTC1627IS8

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