LTC3405 datasheet(2/16 Pages) LINER

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LTC3405

3405fa

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IVFB

Feedback Current

●

±30

IPK

Peak Inductor Current

VIN = 3V, VFB = 0.7V, Duty Cycle < 35%

375

500

625

VFB

Regulated Feedback Voltage

(Note 4)

●

0.784

0.8

0.816

∆VOVL

∆Output Overvoltage Lockout

∆VOVL = VOVL – VFB

●

∆VFB

Reference Voltage Line Regulation

VIN = 2.5V to 5.5V (Note 4)

●

0.04

0.4

%/V

VLOADREG

Output Voltage Load Regulation

0.5

VIN

Input Voltage Range

●

2.5

5.5

Input DC Bias Current

(Note 5)

Pulse Skipping Mode

VFB = 0.7V, Mode = 3.6V, ILOAD = 0A

300

400

µA

Burst Mode

® Operation

VFB = 0.83V, Mode = 0V, ILOAD = 0A

µA

Shutdown

VRUN = 0V, VIN = 4.2V

0.1

µA

fOSC

Oscillator Frequency

VFB = 0.8V

●

1.2

1.5

1.8

MHz

VFB = 0V

210

kHz

RPFET

RDS(ON) of P-Channel FET

ISW = 100mA

0.7

0.85

Ω

RNFET

RDS(ON) of N-Channel FET

ISW = –100mA

0.6

0.90

Ω

ILSW

SW Leakage

VRUN = 0V, VSW = 0V or 5V, VIN = 5V

±0.01

±1

µA

VRUN

RUN Threshold

●

0.3

1.5

IRUN

RUN Leakage Current

●

±0.01

±1

µA

VMODE

MODE Threshold

●

0.3

1.5

IMODE

MODE Leakage Current

●

±0.01

±1

µA

Burst Mode is a registered trademark of Linear Technology Corporation.

LTC3405ES6

TJMAX = 125°C, θJA = 250°C/ W

ORDER PART

NUMBER

(Note 1)

Input Supply Voltage .................................. – 0.3V to 6V

MODE, RUN, VFB Voltages ......................... – 0.3V to VIN

SW Voltage .................................. – 0.3V to (VIN + 0.3V)

P-Channel Switch Source Current (DC) ............. 400mA

N-Channel Switch Sink Current (DC) ................. 400mA

Peak SW Sink and Source Current .................... 630mA

Operating Temperature Range (Note 2) .. – 40°C to 85°C

Junction Temperature (Note 3) ............................ 125°C

Storage Temperature Range ................ – 65°C to 150°C

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

S6 PART MARKING

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

The

● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.

VIN = 3.6V unless otherwise specified.

LTXQ

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

ELECTRICAL CHARACTERISTICS

RUN 1

GND 2

SW 3

6 MODE

5 VFB

4 VIN

TOP VIEW

S6 PACKAGE

6-LEAD PLASTIC TSOT-23

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

of a device may be impaired.

Note 2: The LTC3405E is 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: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formula:

LTC3405: TJ = TA + (PD)(250°C/W)

Note 4: The LTC3405 is tested in a proprietary test mode that connects

VFB to the output of the error amplifier.

Note 5: Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency.

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