LTC3261 datasheet(3/16 Pages) LINER

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LTC3245

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

The l denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at TA = 25°C, (Note 2). VIN = 12V, VOUT = 5V, CFLY = 1µF unless otherwise

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.

Note 3: The junction temperature (TJ, in °C) is calculated from the ambient

temperature (TA, in °C) and power dissipation (PD, in Watts) according to

the formula:

TJ = TA + (PD • θJA) where θJA (in °C/W) is the package thermal

impedance.

Note 4: VOUT programming range is from 2.5V to 5V. See the

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

IVIN

VIN Quiescent Current

SEL1 = SEL2 = 0V

VOUT Enabled, BURST = 0V

VOUT Enabled, BURST = VIN

Shutdown, VOUT = 0V

CP Enabled, Output in Regulation

µA

VOUT5_BM

Fixed 5V Burst Mode Output Regulation

(OUTS/ADJ Connected to VOUT,

BURST = 0V, SEL2 = VIN, SEL1 = VIN)

(Note 5)

5V ≤ VIN < 38V, IOUT ≤ 250mA

4V ≤ VIN < 5V, IOUT ≤ 150mA

3.3V ≤ VIN < 4V, IOUT ≤ 75mA

3V ≤ VIN < 3.3V, IOUT ≤ 45mA

4.8

5.2

VOUT5_LN

Fixed 5V Low Noise Output Regulation

(OUTS/ADJ Connected to VOUT,

BURST = VIN, SEL2 = VIN, SEL1 = VIN)

(Note 5)

5V ≤ VIN < 38V, IOUT ≤ 200mA

4V ≤ VIN < 5V, IOUT ≤ 120mA

3.3V ≤ VIN < 4V, IOUT ≤ 60mA

3V ≤ VIN < 3.3V, IOUT ≤ 35mA

4.8

5.2

VOUT33_BM

Fixed 3.3V Burst Mode Output Regulation

(OUTS/ADJ Connected to VOUT,

BURST = 0V, SEL2 = VIN, SEL1 = VIN)

(Note 5)

5V ≤ VIN < 38V, IOUT ≤ 250mA

4V ≤ VIN < 5V, IOUT ≤ 175mA

3.3V ≤ VIN < 4V, IOUT ≤ 110mA

2.7V ≤ VIN < 3.3V, IOUT ≤ 60mA

3.17

3.43

VOUT33_LN

Fixed 3.3V Low Noise Output Regulation

(OUTS/ADJ Connected to VOUT,

BURST = VIN, SEL2 = VIN, SEL1 = VIN)

(Note 5)

5V ≤ VIN < 38V, IOUT ≤ 220mA

4V ≤ VIN < 5V, IOUT ≤ 140mA

3.3V ≤ VIN < 4V, IOUT ≤ 90mA

2.7V ≤ VIN < 3.3V, IOUT ≤ 50mA

3.17

3.43

VADJ

OUTS/ADJ Reference Voltage (Note 4)

SEL2 = 0V, SEL1 = VIN, IOUT = 0mA

1.176

1.200

1.224

RCL

Load Regulation (Referred to ADJ)

SEL2 = 0V, SEL1 = VIN

0.2

mV/mA

VPG_RISE

PGOOD Rising Threshold

VOUT% of Final Regulation Voltage

VPG_FALL

PGOOD Falling Threshold

VOUT% of Final Regulation Voltage

VPG_LOW

PGOOD Output Low Voltage

IPGOOD = 0.2mA

0.1

0.4

IPG_HIGH

PGOOD Output High Leakage

VPGOOD = 5V

–1

µA

VLOW

BURST, SEL1, SEL2 Input Voltage

0.4

0.9

VHIGH

BURST, SEL1, SEL2 input Voltage

1.2

ILOW

BURST, SEL1, SEL2 Input Current

VPIN = 0V

–1

µA

IHIGH

BURST, SEL1, SEL2 Input Current

VPIN = 38V

0.5

µA

ISHORT_CKT

IVOUT Short-Circuit Current

VOUT = GND

900

ROUT

Charge Pump Output Impedance

2:1 Step-Down Mode

1:1 Step-Down Mode

1:2 Step-Up Mode (VIN = 3.3V)

3.5

fOSC

Oscillator Frequency

450

500

kHz

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