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Giải thích chi tiết về linh kiện  Step-Down DC-DC Converter
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LM53625-Q1, LM53635-Q1
SNVSAA7A – DECEMBER 2015 – REVISED MAY 2016
www.ti.com
Product Folder Links: LM53625-Q1 LM53635-Q1
Submit Documentation Feedback
Copyright © 2015–2016, Texas Instruments Incorporated
Electrical Characteristics (continued)
Limits apply over the recommended operating junction temperature range of –40°C to +150°C, unless otherwise noted.
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 = 13.5 V.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
IFPWM
FPWM leakage current
VIN = 13.5 V, VFPWM = 3.3 V
1
µA
VIN = VFPWM = 13.5 V
5
ISYNC
SYNC leakage current
VIN = 13.5 V, VSYNC = 3.3 V
1
µA
VIN = VSYNC = 13.5 V
5
IL-HS
High-side switch current limit
LM53625
3.5
5
6.5
A
LM53635
4.5
6
7.5
IL-LS
Low-side switch current limit
LM53625
2.5
3.5
4.1
A
LM53635
3.5
4.5
5.1
IL-ZC
Zero-cross current limit FPWM =
low
–0.02
A
IL-NEG
Negative current limit FPWM =
high
–1.5
RDSON
Power switch on-resistance
High-side MOSFET RDSON, VIN = 13
V, IL=1A
60
130
m
Ω
Low-side MOSFET RDSON, VIN = 13
V, IL=1A
40
80
VEN
Enable input threshold voltage -
rising
Enable rising
1.7
2
V
VEN_HYST
Enable threshold hysteresis
0.45
0.55
V
VEN_WAKE
Enable wake-up threshold
0.4
V
IEN
EN pin input current
VIN = VEN = 13.5 V
2
5
µA
VCC
Internal VCC voltage
VIN 13.5 V, VBIAS = 0 V
3.05
V
VIN = 13.5 V, VBIAS = 3.3 V
3.15
VCC_UVLO
Internal VCC input undervoltage
lockout
VIN rising
2.7
V
Hysteresis below VCC-UVLO
185
mV
IFB
Input current from FB to AGND
Adjustable LM53625/35-Q1, FB=1 V
20
nA
VREF
Reference voltage for adjustable
option only
TJ = 25°C
0.993
1
1.007
V
TJ = –40°C to 125°C
0.99
1
1.01
TJ = –40°C to 150°C
0.985
1
1.015
RRESET
RDSON of RESEToutput
Pull FB pin low. Sink 1-mA at
RESET pin
50
85
Ω
VSYNC
VIH
1.5
V
VIL
0.4
VHYST
0.15
1
TSD
Thermal shutdown thresholds(2)
Rising
155
175
°C
Hysteresis
15
DMAX
Maximum switch duty cycle
Fsw = 2.1 MHz
80%
While in dropout(2)
98%


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