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LP3907 데이터시트(PDF) 45 Page - Texas Instruments

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부품명 LP3907
상세설명  Dual High-Current Step-Down DC-DC and Dual Linear Regulator
PDF  58 Pages
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
Logo TI1 - Texas Instruments

LP3907 데이터시트(HTML) 45 Page - Texas Instruments

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OUTPUT CURRENT (mA)
100
90
80
70
60
50
40
30
20
10
0.1
1
10
100
1000
VIN = 2.8V
VIN = 3.6V
VIN = 5.5V
OUTPUT CURRENT (mA)
100
90
80
70
60
50
40
0.1
1
10
100
1000
V = 4.5V
IN
V = 5.5V
IN
45
LP3907
www.ti.com
SNVS511S – JUNE 2007 – REVISED APRIL 2016
Product Folder Links: LP3907
Submit Documentation Feedback
Copyright © 2007–2016, Texas Instruments Incorporated
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)



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