LTM8048 datasheet(3/18 Pages) LINEAR

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LTM8049

8049f

For more information www.linear.com/LTM8049

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 LTM8049E is guaranteed to meet performance specifications

from 0°C to 125°C. Specifications over the –40°C to 125°C internal

temperature range are assured by design, characterization and correlation

with statistical process controls. LTM8049I is guaranteed to meet

specifications over the full –40°C to 125°C internal operating temperature

range. Note that the maximum internal temperature is determined by

specific operating conditions in conjunction with board layout, the rated

package thermal resistance and other environmental factors.

Note 3: This μModule regulator includes overtemperature protection that

is intended to protect the device during momentary overload conditions.

Internal temperature will exceed 125°C when overtemperature protection

is active. Continuous operation above the specified maximum internal

operating junction temperature may impair device reliability.

Note 4: CLKOUTn is intended to drive other circuitry. Do not apply a

positive or negative voltage or current source to CLKOUT, otherwise

permanent damage may occur.

Note 5: The duty cycle of CLKOUT2 is dependent upon the internal

temperature. See the Applications Information section for more details.

The l denotes the specifications which apply over the specified operating

temperature range (Notes 2, 3), otherwise specifications are at TA = 25°C. RUN = 2V unless otherwise specified.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum Input Operating Voltage

2.6

Positive Output DC Voltage

IOUT = 50mA, RFB = 15.4k, VOUTN Grounded

IOUT = 50mA, RFB = 274k, VOUTN Grounded

2.5

Negative Output DC Voltage

IOUT = 50mA, RFB = 30.1k, VOUTP Grounded

IOUT = 50mA, RFB = 287k, VOUTP Grounded

–2.5

–24

Maximum Continuous Output DC Current

VIN = 12V, VOUT = 5V or –5V

VIN = 12V, VOUT = 24 or –24V

0.25

VIN Quiescent Current

VRUN = 0V

VRUN = 2V, No Load

µA

Line Regulation

4 ≤ VIN ≤ 20V, IOUT = 0.6A

0.1

Load Regulation

0 ≤ IOUT ≤ 1A

0.3

Switching Frequency

RT = 31.6k

RT = 412k

2100

160

2500

200

2900

240

kHz

Voltage at FBX Pin

Positive Output

Negative Output

1.185

1.204

1.22

Current into FBX Pin

Positive Output

Negative Output

83.3

85.6

µA

RUN pin Threshold Voltage

RUN Pin Rising

RUN Pin Falling

1.21

1.31

1.27

1.4

RUN Pin Current

VRUN = 3V

VRUN = 1.3V

VRUN = 0V

10.1

12.1

14.1

0.1

µA

SS Sourcing Current

SS = 0V

5.7

8.8

11.7

µA

Synchronization Frequency Range

200

2500

kHz

SYNC Input Low Threshold

0.4

SYNC Input High Threshold

1.3

CLKOUT1 Duty Cycle

(Note 5)

CLKOUT Output Voltage (Low)

2k Pull-Up to 2V

0.2

CLKOUT Output Voltage (High)

2k Pull-Down to GND

1.9

PG Threshold for Positive Feedback Voltage

FBX Rising

1.09

1.2

PG Threshold for Negative Feedback Voltage

FBX Falling

120

PG Output Voltage Low

100µA into PG, FBX = 1V

150

PG Leakage Current

PG = 20V, Run = 0V

µA

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