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LM46000PWP データシート(PDF) 5 Page - Texas Instruments

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部品番号 LM46000PWP
部品情報  LM46000 SIMPLE SWITCHER짰 3.5 V to 60 V 0.5 A Synchronous Step-Down Voltage Converter
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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LM46000
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SNVSA45A – JUNE 2014 – REVISED JULY 2014
6.4 Thermal Information
HTSSOP
THERMAL METRIC (1)
UNIT
(16 PINS)
RθJA
Junction-to-ambient thermal resistance
39.9(2)
RθJC(top)
Junction-to-case (top) thermal resistance
26.9
RθJB
Junction-to-board thermal resistance
21.7
°C/W
ψJT
Junction-to-top characterization parameter
0.8
ψJB
Junction-to-board characterization parameter
21.5
RθJC(bot)
Junction-to-case (bottom) thermal resistance
2.3
(1)
The package thermal impedance is calculated in accordance with JESD 51-7 standard with a 4-layer board and 1 W power dissipation.
(2)
RθJA is highly related to PCB layout and heat sinking. Please refer to Figure 101 for measured RθJA vs PCB area from a 2-layer board
and a 4-layer board.
6.5 Electrical Characteristics
Limits apply over the recommended operating junction temperature (TJ) range of -40°C to 125°C, unless otherwise stated.
Minimum and Maximum limits are specified through test, design or statistical correlation. Typical values represent the most
likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise stated, the following
conditions apply: VIN = 24 V, VOUT = 3.3 V, FS = 500 kHz.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
SUPPLY VOLTAGE (VIN PINS)
VIN-MIN-ST
Minimum input voltage for startup
3.8
V
ISHDN
Shutdown quiescent current
VEN = 0 V
2.3
5
µA
VEN = 3.3 V
Operating quiescent current (non-
IQ-NONSW
VFB = 1.5 V
7
13
µA
switching) from VIN
VBIAS = 3.4 V external
VEN = 3.3 V
Operating quiescent current (non-
IBIAS-NONSW
VFB = 1.5 V
85
140
µA
switching) from external VBIAS
VBIAS = 3.4 V external
VEN = 3.3 V
IOUT = 0 A
IQ-SW
Operating quiescent current (switching)
RT = open
24
µA
VBIAS = VOUT = 3.3 V
RFBT = 1.0 Meg
ENABLE (EN PIN)
Voltage level to enable the internal LDO
VEN-VCC-H
VENABLE high level
1.2
V
output VCC
Voltage level to disable the internal LDO
VEN-VCC-L
VENABLE low level
0.4
V
output VCC
Precision enable level for switching and
VEN-VOUT-H
VENABLE high level
2.00
2.1
2.42
V
regulator output: VOUT
Hysteresis voltage between VOUT
VEN-VOUT-HYS
VENABLE hysteresis
-305
mV
precision enable and disable thresholds
ILKG-EN
Enable input leakage current
VEN = 3.3 V
0.8
1.75
µA
INTERNAL LDO (VCC PIN AND BIAS PIN)
VCC
Internal LDO output voltage VCC
VIN ≥ 3.8 V
3.3
V
VCC rising threshold
3.14
V
Under voltage lock out (UVLO)
VCC-UVLO
Hysteresis voltage between rising and
thresholds for VCC
-567
mV
falling thresholds
VBIAS rising threshold
2.96
3.2
V
Internal LDO input change over
VBIAS-ON
Hysteresis voltage between rising and
threshold to BIAS
-71
mV
falling thresholds
Copyright © 2014, Texas Instruments Incorporated
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