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LTC1701/LTC1701B

ORDER PART

NUMBER

S5 PART

MARKING

TJMAX = 125°C, θJA = 250°C/W

Consult factory for parts specified with wider operating temperature ranges.

LTKG

LTUD

LTC1701ES5

LTC1701BES5

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

(Voltages Referred to GND Pin)

VIN Voltage (Pin 5).......................................– 0.3V to 6V

ITH/RUN Voltage (Pin 4) ..............................– 0.3V to 3V

VFB Voltage (Pin 3) ......................................– 0.3V to 3V

VIN – SW (Max Switch Voltage) ................8.5V to –0.3V

Operating Temperature Range (Note 2) .. – 40

°C to 85°C

Junction Temperature (Note 5) ............................. 125

°C

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

°C to 150°C

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

°C

(Note 1)

The q denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V, RITH/RUN = 1Meg (from VIN to ITH/RUN) unless otherwise

specified. (Note 2)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN

Operating Voltage Range

2.5

5.5

IFB

Feedback Pin Input Current

(Note 3)

±0.1

µA

VFB

Feedback Voltage

(Note 3)

1.22

1.25

1.28

∆VLINE REG

Reference Voltage Line Regulation

VIN = 2.5V to 5V (Note 3)

0.04

0.1

%/V

∆VLOAD REG

Output Voltage Load Regulation

Measured in Servo Loop, VITH = 1.5V, (Note 3)

0.01

0.70

Measured in Servo Loop, VITH = 1.9V, (Note 3)

– 0.80

–1.50

Input DC Supply Current (Note 4)

Active Mode

VFB = 0V

185

300

µA

Sleep Mode

VFB = 1.4V (LTC1701 only)

135

200

µA

Shutdown

VITH/RUN = 0V

0.25

µA

VITH/RUN

Run Threshold High

ITH/RUN Ramping Down

1.4

1.6

Run Threshold Low

ITH/RUN Ramping Up

0.3

0.6

IITH/RUN

Run Pullup Current

VITH/RUN = 1V

100

300

µA

ISW(PEAK)

Peak Switch Current Threshold

VFB = 0V

0.9

1.1

RDS(ON)

Switch ON Resistance

VIN = 5V, VFB = 0V

0.28

Ω

VIN = 3.3V, VFB = 0V

0.30

Ω

VIN = 2.5V, VFB = 0V

0.35

Ω

ISW(LKG)

Switch Leakage Current

VIN = 5V, VITH/RUN = 0V, VFB = 0V

0.01

µA

tOFF

Switch Off-Time

400

500

600

ELECTRICAL CHARACTERISTICS

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

of a device may be impaired.

Note 2: The LTC1701E/LTC1701BE guaranteed to meet performance

specifications from 0

°C to 70°C. Specifications over the –40°C to 85°C

operating temperature range are assured by design, characterization and

correlation with statistical process controls.

Note 3: The LTC1701/LTC1701B are tested in a feedback loop which

servos VFB to the midpoint for the error amplifier without RITH/RUN = 1MHz

(VITH = 1.7V unless otherwise specified).

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

being delivered at the switching frequency.

Note 5: TJ is calculated from the ambient TA and power dissipation PD

according to the following formula:

LTC1701ES5/LTC1701BES5: TJ = TA + (PD • 250°C/W)

SW 1

GND 2

VFB 3

5 VIN

4 ITH/RUN

TOP VIEW

S5 PACKAGE

5-LEAD PLASTIC SOT-23

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