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LTC1772

1772fb

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input DC Supply Current

Typicals at VIN = 4.2V (Note 4)

Normal Operation

2.4V

≤ VIN ≤ 9.8V

270

420

µA

Sleep Mode

2.4V

≤ VIN ≤ 9.8V

230

370

µA

Shutdown

2.4V

≤ VIN ≤ 9.8V, VITH /RUN = 0V

µA

UVLO

VIN < UVLO Threshold

µA

Undervoltage Lockout Threshold

VIN Falling (LTC1772C)

●

1.60

2.00

2.30

VIN Falling (LTC1772E, LTC1772I, LTC1772H)

●

1.55

2.00

2.35

VIN Rising

1.85

2.10

2.40

Shutdown Threshold (at ITH /RUN)

(LTC1772C)

●

0.20

0.35

0.50

(LTC1772E, LTC1772I, LTC1772H)

●

0.15

0.35

0.55

Start-Up Current Source

VITH/RUN = 0V

0.25

0.5

0.85

µA

Regulated Feedback Voltage

(Note 5) (LTC1772C)

●

0.780

0.800

0.820

(Note 5) (LTC1772E, LTC1772I, LTC1772H)

●

0.770

0.800

0.830

Output Voltage Line Regulation

2.4V

≤ VIN ≤ 9.8V (Note 5)

0.05

mV/V

Output Voltage Load Regulation

ITH/RUN Sinking 5µA (Note 5)

2.5

mV/

µA

ITH/RUN Sourcing 5µA (Note 5)

2.5

mV/

µA

VFB Input Current

(Note 5)

Overvoltage Protect Threshold

Measured at VFB

0.820

0.860

0.895

Overvoltage Protect Hysteresis

Oscillator Frequency

VFB = 0.8V

500

550

650

kHz

VFB = 0V

120

kHz

Gate Drive Rise Time

CLOAD = 3000pF

Gate Drive Fall Time

CLOAD = 3000pF

Peak Current Sense Voltage

(Note 6)

120

ABSOLUTE MAXIMUM RATINGS

PACKAGE/ORDER INFORMATION

S6 PART MARKING

ORDER PART NUMBER

LTC1772CS6

LTC1772ES6

LTC1772IS6

LTC1772HS6

LTIL

LTIM

LTB7

LTBRY

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

ELECTRICAL CHARACTERISTICS The ● denotes specifications that apply over the full operating temperature

range, otherwise specifications are at TA = 25°C. VIN = 4.2V unless otherwise specified. (Note 2)

(Note 1)

Input Supply Voltage (VIN).........................– 0.3V to 10V

SENSE–, PGATE Voltages ............. – 0.3V to (VIN + 0.3V)

VFB, ITH /RUN Voltages .............................–0.3V to 2.4V

PGATE Peak Output Current (<10

µs) ......................... 1A

Storage Ambient Temperature Range ... – 65

°C to 150°C

Operating Temperature Range

LTC1772CS6 ........................................... 0

°C to 70°C

LTC1772ES6 (Note 2) ........................ – 40

°C to 85°C

LTC1772IS6 (Note 2) ......................... – 40

°C to 85°C

LTC1772HS6 (Notes 2,3) ................. – 40

°C to 140°C

Junction Temperature (Note 3) ............................. 150

°C

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

°C

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/

θJA = 230°C/ W

ITH/RUN

GND

VFB

PGATE

VIN

SENSE–

TOP VIEW

S6 PACKAGE

6-LEAD PLASTIC SOT-23

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