LTC3565 datasheet(3/22 Pages) LINER

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LTC3565

3565fa

electrical characteristics The

denotes the specifications which apply over the full operating

junction temperature range, otherwise specifications are at TJ = 25°C. VIN = 3.6V, RT = 125k unless otherwise specified. (Note 2)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input DC Supply Current (Note 4)

Active Mode

Sleep Mode

Shutdown

VSYNC/MODE = 3.6V, VFB = 0.55V

VSYNC/MODE = 3.6V, VFB = 0.8V

VRUN = 0V

330

0.1

450

µA

fOSC

Oscillator Frequency

RT = 125k

(Note 7)

1.3

1.5

1.7

MHz

fSYNC

Synchronization Frequency

(Note 7)

0.4

MHz

ILIM

Peak Switch Current Limit

VIN = 3V, VFB = 0.5V

1.5

2.1

2.5

RDS(ON)

Top Switch On-Resistance

MSE Package

DD Package (Note 6)

0.15

0.2

Bottom Switch On-Resistance

MSE Package

DD Package (Note 6)

0.13

0.18

ISW(LKG)

Switch Leakage Current

VIN = 5.5V, VRUN = 0V, VFB = 0V

0.01

µA

VRUN

RUN Threshold

0.3

0.8

1.5

IRUN

RUN Leakage Current

±0.01

±1

µA

VUVLO

Undervoltage Lockout Threshold

VIN Ramping Down

1.9

2.2

PGOOD

Power Good Threshold

VFB Ramping Up from 0.45V to 0.6V

VFB Ramping Down from 0.69V to 0.6V

–7

RPGOOD

Power Good Pull-Down On-Resistance

PGOOD Blanking

VFB Step from 0V to 0.6V

VFB Step from 0.6V to 0V

105

µs

VSYNC-MODE

Pulse Skip

Force Continuous

Burst

1.1

VIN – 0.75

0.63

VIN – 1.05

tSOFT-START

10% to 90% of Regulation

0.6

0.9

1.2

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LTC3565E is guaranteed to meet performance specifications

from 0°C to 85°C junction temperature. Specifications over the –40°C

to 125°C operating junction temperature range are assured by design,

characterization and correlation with statistical process controls. The

LTC3565I is guaranteed over the full –40°C to 125°C operating junction

temperature range. Note that the maximum ambient temperature is

determined by specific operating conditions in conjunction with board

layout, the rated package thermal resistance and other environmental

factors.

Note 3: The LTC3565 is tested in a feedback loop which servos VFB to the

midpoint for the error amplifier (VITH = 0.7V).

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 formulas:

LTC3565EDD: TJ = TA + (PD • 43°C/W)

LTC3565EMSE: TJ = TA + (PD • 40°C/W)

Note 6: Switch on-resistance is guaranteed by correlation to wafer level

measurements and assured by design characterization and correlation with

statistical process controls.

Note 7: 4MHz operation is guaranteed by design but not production tested

and is subject to duty cycle limitations (see Applications Information).

Note 8: This IC includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed 125°C when overtemperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

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