LM2750 datasheet(4/15 Pages) NSC

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Electrical Characteristics

(Notes 2, 7) (Continued)

Typical values and limits in standard typeface apply for T

J =25

oC. Limits in boldface type apply over the operating junction

temperature range. Unless otherwise specified: 2.9V

≤ V

≤ 5.6V, V

OUT = 5.0V (LM2750-ADJ), V(SD) = VIN,CFLY = 1µF, CIN

= 2 x 1µF, C

OUT = 2 x 1µF (Note 8).

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Capacitor Requirements

Required Input

Capacitance(Note 12)

OUT

≤ 60mA

1.0

µF

60mA

≤ I

OUT

≤ 120mA

2.0

OUT

Required Output

Capacitance(Note 12)

OUT

≤ 60mA

1.0

µF

60mA

≤ I

OUT

≤ 120mA

2.0

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under which operation of

the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the

Electrical Characteristics tables.

Note 2: All voltages are with respect to the potential at the GND pin.

Note 3: Thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at TJ=150˚C (typ.) and disengages at TJ=135˚C (typ.).

Note 4: The Human body model is a 100 pF capacitor discharged through a 1.5 k

Ω resistor into each pin. MIL-STD-883 3015.7. The machine model is a 200pF

capacitor discharged directly into each pin.

Note 5: Maximum ambient temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX-OP = 125

oC), the maximum power

dissipation of the device in the application (PD-MAX), and the junction-to ambient thermal resistance of the part/package in the application (θJA), as given by the

following equation: TA-MAX =TJ-MAX-OP -(θJA xPD-MAX). Maximum power dissipation of the LM2750 in a given application can be approximated using the following

equation: PD-MAX =(VIN-MAX xIIN-MAX)-(VOUT xIOUT-MAX)=[VIN-MAX x((2xIOUT-MAX) + 5mA)] - (VOUT xIOUT-MAX). In this equation, VIN-MAX,IIN-MAX, and

IOUT-MAX are the maximum voltage/current of the specific application, and not necessarily the maximum rating of the LM2750.

The maximum ambient temperature rating of 85oC is determined under the following application conditions:

θJA =55oC/W, PD-MAX = 727mW (achieved when

VIN-MAX = 5.5V and IOUT-MAX = 115mA, for example). Maximum ambient temperature must be derated by 1.1

oC for every increase in internal power dissipation of

20mW above 727mW (again assuming that

θJA =55oC/W in the application). For more information on these topics, please refer to Application Note 1187: Leadless

Leadframe Package (LLP) and the Power Efficiency and Power Dissipation section of this datasheet.

Note 6: Junction-to-ambient thermal resistance (

θJA) is taken from a thermal modeling result, performed under the conditions and guidelines set forth in the JEDEC

standard JESD51-7. The test board is a 4 layer FR-4 board measuring 102mm x 76mm x 1.6mm witha2x1 array of thermal vias. The ground plane on the board

is 50mm x 50mm. Thickness of copper layers are 36µm/18µm /18µm/36µm (1.5oz/1oz/1oz/1.5oz). Ambient temperature in simulation is 22˚C, still air. Power

dissipation is 1W.

The value of

θJA of the LM2750 in LLP-10 could fall in a range as wide as 50oC/W to 150oC/W (if not wider), depending on PCB material, layout, and environmental

conditions. In applications where high maximum power dissipation exists (high VIN, high IOUT), special care must be paid to thermal dissipation issues. For more

information on these topics, please refer to Application Note 1187: Leadless Leadframe Package (LLP) and the Layout Recommendations section of this

datasheet.

Note 7: Min and Max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the most likely norm.

Note 8: CFLY,CIN, and COUT : Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics

Note 9: Turn-on time is measured from when SD signal is pulled high until the output voltage crosses 90% of its final value.

Note 10: Efficiency is measured versus VIN, with VIN being swept in small increments from 3.0V to 4.2V. The average is calculated from these measurements

results. Weighting to account for battery voltage discharge characteristics (VBAT vs. Time) is not done in computing the average.

Note 11: SD Input Current (IIH ) is due to a 200kΩ (typ.) pull-down resistor connected internally between the SD pin and GND.

Note 12: Limit is the minimum required output capacitance to ensure proper operation. This electrical specification is guaranteed by design.

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