LTC3245

3

3245f

For more information www.linear.com/LTC3245

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. This IC has overtemperature protection that is

intended to protect the device during momentary overload conditions.

Junction temperatures will exceed 150°C when overtemperature is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

Note 2: The LTC3245E is guaranteed to meet performance specifications

from 0°C to 85°C. Specifications over the –40°C to 125°C operating junction

temperature range are assured by design, characterization and correlation

with statistical process controls. The LTC3245I is guaranteed over the –40°C

to 125°C operating junction temperature range. The LTC3245H is guaranteed

over the –40°C to 150°C operating junction temperature range. High junction

temperatures degrade operating lifetimes; operating lifetime is derated for

junction temperatures greater than 125°C. Note that the maximum ambient

noted.

temperature consistent with these specifications is determined by specific

operating conditions in conjunction with board layout, the rated package

thermal resistance and other environmental factors.

the formula:

impedance.

Programming the Output Voltage section for more detail.

Note 5: The maximum operating junction temperature of 150°C must be

followed. Certain combinations of input voltage and output current will

cause the junction temperature to exceed 150°C and must be avoided. See

Thermal Management section for information on calculating maximum

operating conditions.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

SEL1 = SEL2 = 0V

CP Enabled, Output in Regulation

CP Enabled, Output in Regulation

4

18

20

8

35

40

µA

µA

µA

Fixed 5V Burst Mode Output Regulation

(Note 5)

l

l

l

l

4.8

4.8

4.8

4.8

5.2

5.2

5.2

5.2

V

V

V

V

Fixed 5V Low Noise Output Regulation

(Note 5)

l

l

l

l

4.8

4.8

4.8

4.8

5.2

5.2

5.2

5.2

V

V

V

V

Fixed 3.3V Burst Mode Output Regulation

(Note 5)

l

l

l

l

3.17

3.17

3.17

3.17

3.43

3.43

3.43

3.43

V

V

V

V

Fixed 3.3V Low Noise Output Regulation

(Note 5)

l

l

l

l

3.17

3.17

3.17

3.17

3.43

3.43

3.43

3.43

V

V

V

V

OUTS/ADJ Reference Voltage (Note 4)

l

1.176

1.200

1.224

V

Load Regulation (Referred to ADJ)

0.2

mV/mA

PGOOD Rising Threshold

95

98

%

PGOOD Falling Threshold

88

91

%

PGOOD Output Low Voltage

l

0.1

0.4

V

PGOOD Output High Leakage

–1

0

1

µA

BURST, SEL1, SEL2 Input Voltage

l

0.4

0.9

V

BURST, SEL1, SEL2 input Voltage

l

1.2

2

V

BURST, SEL1, SEL2 Input Current

–1

0

1

µA

BURST, SEL1, SEL2 Input Current

0.5

1

3

µA

900

mA

Charge Pump Output Impedance

2:1 Step-Down Mode

1:1 Step-Down Mode

3

3.5

14

Ω

Ω

Ω

Oscillator Frequency

l

450

500

kHz