LP3907TL-PLNTOSLASHNOPB datasheet(45/58 Pages) TI1

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OUTPUT CURRENT (mA)

100

0.1

100

1000

VIN = 2.8V

VIN = 3.6V

VIN = 5.5V

OUTPUT CURRENT (mA)

100

0.1

100

1000

V = 4.5V

V = 5.5V

LP3907

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SNVS511S – JUNE 2007 – REVISED APRIL 2016

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TJ-MAX-OP = TA-MAX + (RθJA) [°C/ Watt] × (PD-MAX) [Watts]

(12)

Total device power dissipation PD-MAX is the sum of the individual power dissipation of the four regulators plus a

minor amount for chip overhead. Chip overhead is Bias, TSD, and LDO analog.

PD-MAX = PLDO1 + PLD02 + PBUCK1 + PBUCK2 + (0.0001A × VIN) [Watts].

(13)

Power dissipation of LDO1:

PLDO1 = (VINLDO1 – VOUTLDO1) × IOUTLDO1 [V × A]

(14)

Power dissipation of LDO2:

PLDO2 = (VINLDO2 – VOUTLDO2) × IOUTLDO2 [V × A]

(15)

Power dissipation of Buck1:

PBuck1 = PIN – POUT = VOUTBuck1 × IOUTBuck1 × (1 – η1) / η1 [V × A]

where

•

η1 = efficiency of buck 1

(16)

Power dissipation of Buck2:

PBuck2 = PIN – POUT = VOUTBuck2 × IOUTBuck2 × (1 – η2) / η2 [V × A]

where

•

η2 = efficiency of Buck2

where

•

η is the efficiency for the specific condition taken from efficiency graphs.

(17)

9.2.3 Application Curves

VOUT = 2 V

L= 2.2 µH

Figure 47. Efficiency vs Output Current

(Forced PWM Mode)

VOUT = 2 V

L= 2.2 µH

Figure 48. Efficiency vs Output Current

(PWM-to-PFM Mode)

LP3907TL-PLNTO/NOPB 数据表(PDF) 45 Page - Texas Instruments

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LP3907TL-PLNTO/NOPB 数据表(PDF) 45 Page - Texas Instruments

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