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Giải thích chi tiết về linh kiện  SIMPLE SWITCHER 3.5 V to 36 V 3 A Synchronous Step-Down Voltage Converter
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LM43603-Q1
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SNVSA82A – APRIL 2015 – REVISED MAY 2015
7.4 Thermal Information
PWP (HTSSOP)
THERMAL METRIC (1)(2)
UNIT
(16 PINS)
RθJA
Junction-to-ambient thermal resistance
38.9(3)
RθJC (Top)
Junction-to-case (top) thermal resistance
24.3
RθJB
Junction-to-board thermal resistance
19.9
°C/W
ψJT
Junction-to-top characterization parameter
0.7
ψJB
Junction-to-board characterization parameter
19.7
RθJC(bot)
Junction-to-case (bottom) thermal resistance
1.7
(1)
The package thermal impedance is calculated in accordance with JESD 51-7;
(2)
Thermal resistances were simulated on a 4 layer, JEDEC board.
(3)
See Figure 98 for RθJA vs Copper Area Curve
7.5 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 = 12 V, VOUT = 3.3 V, FS = 500 kHz.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
SUPPLY VOLTAGE (VIN PIN)
VIN-MIN-ST
Minimum input voltage for start-up
3.8
V
ISHDN
Shutdown quiescent current
VEN = 0 V
1.2
3.1
µA
VEN = 3.3 V
Operating quiescent current (non-
IQ-NONSW
VFB = 1.5 V
5
10
µA
switching) from VIN
VBIAS = 3.4 V external
VEN = 3.3 V
Operating quiescent current (non-
IBIAS-NONSW
VFB = 1.5 V
85
130
µA
switching) from external VBIAS
VBIAS = 3.4 V external
VEN = 3.3 V
IOUT = 0 A
Operating quiescent current
IQ-SW
RT = open
27
µA
(switching)
VBIAS = VOUT = 3.3 V
RFBT = 1 Meg
ENABLE (EN PIN)
Voltage level to enable the internal
VEN-VCC-H
VENABLE high level
1.2
V
LDO output VCC
Voltage level to disable the internal
VEN-VCC-L
VENABLE low level
0.525
V
LDO output VCC
Precision enable level for switching
VEN-VOUT-H
VENABLE high level
2.00
2.20
2.42
V
and regulator output: VOUT
Hysteresis voltage between VOUT
VEN-VOUT-HYS
precision enable and disable
VENABLE hysteresis
–290
mV
thresholds
ILKG-EN
Enable input leakage current
VEN = 3.3 V
0.8
1.75
µA
INTERNAL LDO (VCC and BIAS PINS)
VCC
Internal LDO output voltage VCC
VIN ≥ 3.8 V
3.28
V
VCC rising threshold
3.1
V
Undervoltage lockout (UVLO)
VCC-UVLO
Hysteresis voltage between rising
thresholds for VCC
–520
mV
and falling thresholds
VBIAS rising threshold
2.94
3.15
V
Internal LDO input change over
VBIAS-ON
Hysteresis voltage between rising
threshold to BIAS
-75
mV
and falling thresholds
Copyright © 2015, Texas Instruments Incorporated
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