LTC1701B 查看數據表（PDF） - Linear Technology

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LTC1701B

1MHz Step-Down DC/DC Converters in SOT-23

Linear Technology 

LTC1701/LTC1701B

ABSOLUTE AXI U RATI GS

(Note 1)

(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

UW U

PACKAGE/ORDER I FOR ATIO

TOP VIEW

SW 1

GND 2

VFB 3

5 VIN

4 ITH/RUN

S5 PACKAGE

5-LEAD PLASTIC SOT-23

TJMAX = 125°C, θJA = 250°C/W

SEE THE APPLICATION

INFORMATION SECTION

ORDER PART

NUMBER

LTC1701ES5

LTC1701BES5

S5 PART

MARKING

LTKG

LTUD

Consult factory for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS 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

VIN

IFB

VFB

∆VLINE REG

∆VLOAD REG

VITH/RUN

IITH/RUN

ISW(PEAK)

RDS(ON)

PARAMETER

Operating Voltage Range

Feedback Pin Input Current

Feedback Voltage

Reference Voltage Line Regulation

Output Voltage Load Regulation

Input DC Supply Current (Note 4)

Active Mode

Sleep Mode

Shutdown

Run Threshold High

Run Threshold Low

Run Pullup Current

Peak Switch Current Threshold

Switch ON Resistance

ISW(LKG)

tOFF

Switch Leakage Current

Switch Off-Time

CONDITIONS

MIN

2.5

(Note 3)

(Note 3)

q 1.22

VIN = 2.5V to 5V (Note 3)

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

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

VFB = 0V

VFB = 1.4V (LTC1701 only)

VITH/RUN = 0V

ITH/RUN Ramping Down

ITH/RUN Ramping Up

0.3

VITH/RUN = 1V

50

VFB = 0V

0.9

VIN = 5V, VFB = 0V

VIN = 3.3V, VFB = 0V

VIN = 2.5V, VFB = 0V

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

400

TYP

1.25

0.04

0.01

– 0.80

MAX

5.5

± 0.1

1.28

0.1

0.70

– 1.50

UNITS

V

µA

V

%/V

%

%

185 300

µA

135

200

µA

0.25

1

µA

1.4

1.6

V

0.6

V

100 300

µA

1.1

A

0.28

Ω

0.30

Ω

0.35

Ω

0.01

1

µA

500 600

ns

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)

2

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