LTC3548 datasheet(3/16 Pages) LINER

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LTC3548

3548fc

ELECTRICAL CHARACTERISTICS

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 LTC3548 is guaranteed to meet speciﬁed performance from

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

range are assured by design, characterization and correlation with

statistical process controls. The LTC3548I is guaranteed to meet speciﬁed

performance over the full –40°C to 85°C temperature range.

Note 3: The LTC3548 is tested in a proprietary test mode that connects VFB

to the output of the error ampliﬁer.

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: TJ = TA + (PD • θJA).

Note 6: The DFN switch on-resistance is guaranteed by correlation to

wafer level measurements.

The ● denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C. VIN = 3.6V, unless otherwise speciﬁed. (Note 2)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

ΔVLOADREG

Output Voltage Load Regulation

(Note 3)

0.5

Input DC Supply Current

Active Mode

Sleep Mode

Shutdown

(Note 4)

VFB1 = VFB2 = 0.5V

VFB1 = VFB2 = 0.63V, MODE/SYNC = 3.6V

RUN = 0V, VIN = 5.5V, MODE/SYNC = 0V

700

0.1

950

μA

fOSC

Oscillator Frequency

VFB = 0.6V

1.8

2.25

2.7

MHz

fSYNC

Synchronization Frequency

2.25

MHz

ILIM

Peak Switch Current Limit Channel 1

Peak Switch Current Limit Channel 2

VIN = 3V, VFB = 0.5V, Duty Cycle <35%

0.95

0.6

1.2

0.7

1.6

0.9

RDS(ON)

Top Switch On-Resistance

Bottom Switch On-Resistance

(Note 6)

0.35

0.30

0.45

ISW(LKG)

Switch Leakage Current

VIN = 5V, VRUN = 0V, VFB = 0V

0.01

μA

POR

Power-On Reset Threshold

VFB Ramping Down, MODE/SYNC = 0V

–8.5

Power-On Reset On-Resistance

100

200

Power-On Reset Delay

262,144

Cycles

VRUN

RUN Threshold

0.3

1.5

IRUN

RUN Leakage Current

0.01

μA

MODE

Mode Threshold Low

Mode Threshold High

VIN – 0.5

0.5

VIN

TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise speciﬁed.

Load Step

Burst Mode Operation

Pulse-Skipping Mode

3548 G01

VIN = 3.6V

VOUT = 1.8V

ILOAD = 180mA

CHANNEL 1; CIRCUIT OF FIGURE 3

5V/DIV

VOUT

20mV/DIV

200mA/DIV

2μs/DIV

3548 G02

VIN = 3.6V

VOUT = 1.8V

ILOAD = 30mA

CHANNEL 1; CIRCUIT OF FIGURE 3

5V/DIV

VOUT

10mV/DIV

200mA/DIV

1μs/DIV

3548 G03

VIN = 3.6V

VOUT = 1.8V

ILOAD = 80mA TO 800mA

CHANNEL 1; CIRCUIT OF FIGURE 3

VOUT

200mV/DIV

500mA/DIV

ILOAD

500mA/DIV

20μs/DIV

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