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LM43603QPWPRQ1 bảng dữ liệu(PDF) 6 Page - Texas Instruments

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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
SNVSA82A – APRIL 2015 – REVISED MAY 2015
www.ti.com
Electrical Characteristics (continued)
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
VOLTAGE REFERENCE (FB PIN)
TJ = 25 ºC
1.012
1.015
1.019
VFB
Feedback voltage
V
TJ = -40 ºC to 125 ºC
0.999
1.015
1.032
ILKG-FB
Input leakage current at FB pin
FB = 1.015 V
0.2
65
nA
THERMAL SHUTDOWN
Shutdown threshold
160
ºC
TSD
(1)
Thermal shutdown
Recovery threshold
150
ºC
CURRENT LIMIT AND HICCUP
IHS-LIMIT
Peak inductor current limit
4.4
5.5
6.4
A
ILS-LIMIT
Inductor current valley limit
2.6
3
3.3
A
SOFT START (SS/TRK PIN)
ISSC
Soft-start charge current
1.25
2
2.75
µA
RSSD
Soft-start discharge resistance
UVLO, TSD, OCP, or EN = 0 V
18
k
Ω
POWER GOOD (PGOOD PIN)
Power-good flag over voltage tripping
VPGOOD-HIGH
% of FB voltage
110%
113%
threshold
Power-good flag under voltage
VPGOOD-LOW
% of FB voltage
77%
88%
tripping threshold
VPGOOD-HYS
Power-good flag recovery hysteresis
% of FB voltage
6%
VEN = 3.3 V
40
125
PGOOD pin pull down resistance
RPGOOD
Ω
when power bad
VEN = 0 V
60
150
MOSFETS (2)
IOUT = 1 A
RDS-ON-HS
High-side MOSFET ON-resistance
120
m
Ω
VBIAS = VOUT = 3.3 V
IOUT = 1 A
RDS-ON-LS
Low-side MOSFET ON-resistance
65
m
Ω
VBIAS = VOUT = 3.3 V
(1)
Ensured by design
(2)
Measured at pins
7.6 Timing Requirements
MIN
TYP
MAX
UNIT
CURRENT LIMIT AND HICCUP
NOC
Hiccup wait cycles when LS current limit tripped
32
Cycles
TOC
Hiccup retry delay time
5.5
ms
SOFT START (SS/TRK PIN)
TSS
Internal soft-start time when SS pin open circuit
4.1
ms
POWER GOOD (PGOOD PIN)
TPGOOD-RISE Power-good flag rising transition deglitch delay
220
µs
TPGOOD-FALL Power-good flag falling transition deglitch delay
220
µs
6
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Product Folder Links: LM43603-Q1


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