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LM46001QPWPRQ1 bảng dữ liệu(PDF) 5 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  3.5-V to 60-V, 1 A Synchronous Step-Down Voltage Converter
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LM46001-Q1
www.ti.com
SNVSAA3B – JULY 2015 – REVISED NOVEMBER 2017
Product Folder Links: LM46001-Q1
Submit Documentation Feedback
Copyright © 2015–2017, Texas Instruments Incorporated
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
(2)
The package thermal impedance is calculated in accordance with JESD 51-7 standard with a 4-layer board and 1 W power dissipation.
(3)
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.
6.4 Thermal Information
THERMAL METRIC(1)(2)
LM46001-Q1
UNIT
PWP (HTSSOP)
16 PINS
RθJA
Junction-to-ambient thermal resistance
39.9(3)
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
26.9
°C/W
RθJB
Junction-to-board thermal resistance
21.7
°C/W
ψJT
Junction-to-top characterization parameter
0.8
°C/W
ψJB
Junction-to-board characterization parameter
21.5
°C/W
RθJC(bot)
Junction-to-case (bottom) thermal resistance
2.3
°C/W
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.
PARAMETER
TEST 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
IQ-NONSW
Operating quiescent current (non-
switching) from VIN
VEN = 3.3 V
VFB = 1.5 V
VBIAS = 3.4 V external
7
13
µA
IBIAS-NONSW
Operating quiescent current (non-
switching) from external VBIAS
VEN = 3.3 V
VFB = 1.5 V
VBIAS = 3.4 V external
85
140
µA
IQ-SW
Operating quiescent current (switching)
VEN = 3.3 V
IOUT = 0 A
RT = open
VBIAS = VOUT = 3.3 V
RFBT = 1 Meg
24
µA
ENABLE (EN PIN)
VEN-VCC-H
Voltage level to enable the internal LDO
output VCC
VENABLE high level
1.2
V
VEN-VCC-L
Voltage level to disable the internal LDO
output VCC
VENABLE low level
0.4
V
VEN-VOUT-H
Precision enable level for switching and
regulator output: VOUT
VENABLE high level
2
2.1
2.42
V
VEN-VOUT-HYS
Hysteresis voltage between VOUT
precision enable and disable thresholds
VENABLE hysteresis
–305
mV
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-UVLO
Undervoltage lockout (UVLO) thresholds
for VCC
VCC rising threshold
3.14
V
Hysteresis voltage between rising and
falling thresholds
–567
mV
VBIAS-ON
Internal LDO input change over
threshold to BIAS
VBIAS rising threshold
2.96
3.2
V
Hysteresis voltage between rising and
falling thresholds
–71
mV


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