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
Typical Operating Characteristics
(VSUP = VSUPSW = 14V, VEN = 14V, L1 = 4.7FH, CIN = 4.7FF, COUT = 22FF, CBIAS = 1FF, CBST = 0.1FF, CCRES = 1nF, RFOSC =
61.9kI, TA = +25NC, unless otherwise noted.)
STARTUP WITH FULL LOAD
(OUT = 1.25V, fSW = 400kHz)
MAX16975 toc01
ILOAD = 1.2A
OUT
1V/div
0V
RES
0V
5V/div
EN
0V
5V/div
SUP
5V/div
0V
2ms/div
SWITCHING FREQUENCY
vs. LOAD CURRENT (1.25V/400kHz)
402.0
PWM MODE
EFFICIENCY vs. LOAD CURRENT
100
90
80
70
3.3V/400kHz
60
8V/400kHz
50
5V/400kHz
40
1.25V/400kHz
30
20
10
0
0
400
800
1200
ILOAD (mA)
SWITCHING FREQUENCY vs. RFOSC
1200
5V OUTPUT
401.6
1000
401.2
800
400.8
600
400.4
400
400.0
200
450
700
950
1200
ILOAD (mA)
SWITCHING FREQUENCY vs. TEMPERATURE
(1.25V/400kHz, 5V/400kHz)
450
ILOAD = 1.2A, RFOSC = 64.87kI
430
5V/400kHz
410
390
1.25V/400kHz
370
350
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
200
10
32
54
76
98 120
RFOSC (kI)
LOAD-STEP RESPONSE
(1.25V/400kHz)
MAX16975 toc06
0 TO 1.25A LOAD STEP
VOUT
AC-COUPLED
VOUT
100mV/div
0
ILOAD
1A/div
0
4ms/div
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