MAX16975 查看數據表（PDF） - Maxim Integrated
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MAX16975 Datasheet PDF : 17 Pages
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MAX16975
28V, 1.2A Automotive Step-Down Converter
with Low Operating Current
ELECTRICAL CHARACTERISTICS* (continued)
(VSUP = VSUPSW = 14V, VEN = 14V, L1 = 22FH, CIN = 4.7FF, COUT = 100FF, CBIAS = 1FF, CBST = 0.1FF, CCRES = 1nF, RFOSC =
61.9kI, TA = TJ = -40NC to +125NC, unless otherwise noted. Typical values are at TA = +25NC.)
PARAMETER
SYMBOL
CONDITIONS
MIN
BST Input Current
IBST VBST - VLX = 5V
LX Current Limit
VSUP = 4.5V to 28V, VSUPSW = 14V,
ILX
TA = +25°C
1.5
VSUP = 4.5V to 28V, VSUPSW = 14V
1.5
Skip-Mode Current Threshold
ISKIP_TH
Power-Switch On-Resistance
RON
RON measured between SUPSW and LX, ILX =
1A, VSUP = 4.5V to 28V, VBST - VLX = 4.5V
LX Leakage Current
ILX,LEAK VSUPSW = 28V, VLX = 0V, TA = +25°C
TRANSCONDUCTANCE AMPLIFIER (COMP)
FB Input Current
FB Regulation Voltage
FB Line Regulation
Transconductance (from FB to
COMP)
IFB
VFB
DVLINE
gm
FB connected to an external resistive divider,
TA = +25°C
FB connected to an external resistive divider,
-40°C P TA P +125°C
4.5V < VSUP < 28V
0.99
0.985
VFB = 1V, VBIAS = 5V
Minimum On-Time
Cold-Crank Event Duty Cycle
OSCILLATOR FREQUENCY
tON
DCCC
RFOSC = 25.5kI, VSUP = 4.5V to 28V
Oscillator Frequency
RFOSC = 61.9kI, VSUP = 4.5V to 28V
348
RFOSC = 120kI, VSUP = 4.5V to 28V (Note 3) 191
Oscillator Frequency Range
fOSC (Note 3)
220
EXTERNAL CLOCK INPUT (FSYNC)
External Input Clock Acquisition
Time
tFSYNC
External Input Clock Frequency
(Note 3)
fOSC +
10%
External Input Clock High Threshold VFSYNC_HI VFSYNC rising
1.4
External Input Clock Low Threshold VFSYNC_LO VFSYNC falling
FSYNC Pulldown Resistance
RFSYNC
Soft-Start Time
tSS
fSW = 400kHz
fSW = 1.0MHz
ENABLE INPUT (EN)
Enable On Threshold Voltage Low VEN_LO
TYP
1.7
1.8
1.8
200
300
0.01
20
1.0
1.0
0.02
1000
110
94
1.0
400
220
1
500
4
1.6
MAX
2.5
2.0
550
1
1.01
1.015
452
249
1000
0.4
0.8
UNITS
mA
A
mA
mI
FA
nA
V
%/V
FS
ns
%
MHz
kHz
kHz
kHz
Cycles
Hz
V
V
kI
ms
ms
V
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*The parametric values (min, typ, max limits) shown in the Electrical Characteristics table supersede values quoted elsewhere in this data sheet.
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