LTC1707 datasheet(2/16 Pages) LINER

Nome de Peças	LTC1707

Descrição Electrónicos	High Efficiency Monolithic Synchronous Step-Down Switching Regulator

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LTC1707

ORDER PART

NUMBER

S8 PART MARKING

Consult factory for Military grade parts.

1707

1707I

LTC1707CS8

LTC1707IS8

TJMAX = 125°C, θJA = 110°C/ W

TOP VIEW

VREF

SYNC/MODE

VIN

SW

ITH

RUN/SS

VFB

GND

S8 PACKAGE

8-LEAD PLASTIC SO

1

2

3

4

8

7

6

5

(Note 1)

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

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

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

SYNC/MODE Voltage ................................. – 0.3V to VIN

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

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IVFB

Feedback Current

(Note 3)

6

60

nA

VFB

Regulated Feedback Voltage

(Note 3)

q

0.78

0.80

0.82

V

∆VOVL

Output Overvoltage Lockout

∆VOVL = VOVL – VFB

20

60

110

mV

∆VFB

Reference Voltage Line Regulation

VIN = 3V 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

%

IS

Input DC Bias Current

(Note 4)

Pulse Skipping Mode

VIN = 8.5V, VOUT = 3.3V, VSYNC/MODE = 0V

300

µA

Burst Mode Operation

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

200

320

µA

Shutdown

VRUN/SS = 0V, 3V < VIN < 8.5V

11

35

µA

Shutdown

VRUN/SS = 0V, VIN < 3V

6

µA

VRUN/SS

Run/SS Threshold

VRUN/SS Ramping Positive

0.4

0.7

1.0

V

IRUN/SS

Soft-Start Current Source

VRUN/SS = 0V

1.2

2.25

3.3

µA

ISYNC/MODE

SYNC/MODE Pull-Up Current

VSYNC/MODE = 0V

0.5

1.5

2.5

µA

fOSC

Oscillator Frequency

VFB = 0.7V

315

350

385

kHz

VFB = 0V

35

kHz

VUVLO

Undervoltage Lockout

VIN Ramping Down from 3V (0°C to 70°C)

2.55

2.70

2.85

V

VIN Ramping Up from 0V (0°C to 70°C)

2.60

2.80

3.00

V

VIN Ramping Down from 3V (–40°C to 85°C)

2.45

2.70

2.85

V

VIN Ramping Up from 0V (–40°C to 85°C)

2.50

2.80

3.00

V

RPFET

RDS(ON) of P-Channel FET

ISW = –100mA

0.5

0.7

Ω

RNFET

RDS(ON) of N-Channel FET

ISW = – 100mA

0.6

0.8

Ω

IPK

Peak Inductor Current

VIN = 4V, ITH = 1.4V, Duty Cycle < 40%

0.70

0.915

1.10

A

ILSW

SW Leakage

VRUN/SS = 0V

±10

±1000

nA

VREF

Reference Output Voltage

IREF = 0µA

q

1.178

1.19

1.202

mV

∆VREF

Reference Output Load Regulation

0V

≤ IREF ≤ 100µA

q

2.3

15

mV

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 LTC1707 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.

The q denotes specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 5V unless otherwise specified.

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

ELECTRICAL CHARACTERISTICS

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