Datasheet

High-Voltage, 2.2MHz, 2A Automotive Step-
Down Converter with Low Operating Current
MAX16974
6 ______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
SUP
= V
SUPSW
= 14V, V
OUT
= 5V, FSYNC = GND, f
OSC
= 400kHz, T
A
= +25NC, unless otherwise noted. See Figure 1.)
SWITCHING FREQUENCY vs. R
FOSC
MAX16974 toc12
R
FOSC
(kI)
SWITCHING FREQUENCY (MHz)
12211222 32 42 62 72 82 9252 102
0.4
0.8
1.2
1.6
2.0
2.4
2.8
0
12
SWITCHING FREQUENCY
vs. SUPPLY VOLTAGE
MAX16974 toc13
SUPPLY VOLTAGE (V)
SWITCHING FREQUENCY (kHz)
262420 2210 12 14 16 188
402
404
406
408
410
412
414
416
418
420
400
6 28
I
LOAD
= 1A
FSYNC TRANSITION FROM INTERNAL TO EXTERNAL
FREQUENCY (5V/2.2MHz CONFIGURATION)
MAX16974 toc14
0
0
5V/div
2V/div
10V/div
0
EXTERNAL CLOCK
AT SYNC
V
OUT
V
LX
1µs/div
V
OUT
vs. I
LOAD
MAX16974 toc15
I
LOAD
(A)
V
OUT
(V)
1.81.61.2 1.40.4 0.6 0.8 1.00.2
4.92
4.94
4.96
4.98
5.00
5.02
5.04
5.06
5.08
5.10
4.90
0 2.0
V
SUP
= 14V
5V/400kHz
5V/2.2MHz
SWITCHING FREQUENCY vs. I
LOAD
MAX16974 toc16
I
LOAD
(A)
SWITCHING FREQUENCY (kHz)
1.81.61.2 1.40.4 0.6 0.8 1.00.2
402
404
406
408
410
412
414
416
418
420
400
0 2.0
V
SUP
= 14V
STARTUP INTO HEAVY LOAD
(5V/2.2MHz)
MAX16974 toc17
0
0
0V
5V/div
2V/div
5V/div
2A/div
0V
V
SUP
V
OUT
I
LOAD
400µs/div
V
RES