Datasheet
High-Voltage, 2.2MHz, 2A Automotive Step-
Down Converter with Low Operating Current
MAX16974
4 ______________________________________________________________________________________
Typical Operating Characteristics
(V
SUP
= V
SUPSW
= 14V, V
OUT
= 5V, FSYNC = GND, f
OSC
= 400kHz, T
A
= +25NC, unless otherwise noted. See Figure 1.)
Note 2: Guaranteed by design; not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(V
SUP
= V
SUPSW
= 14V, L1 = 4.7FH, V
EN
= 14V, C
IN
= 10FF, C
OUT
= 22FF, C
BIAS
= 1FF, C
BST
= 0.1FF, C
CRES
= 1nF, R
FOSC
=
12.1kI, T
A
= T
J
= -40NC to +125NC, unless otherwise noted. Typical values are at T
A
= +25NC.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CRES Source Current I
CRES
V
OUT
in regulation 9.5 10 10.5
FA
CRES Pulldown Current I
CRES_PD
V
OUT
out of regulation 1 mA
RES Sink Current
V
RES
pulls low, V
RES
> 0.4V
1 mA
RES Leakage Current (Open-
Drain Output)
V
OUT
in regulation, T
A
= +25NC
1
FA
Reset Debounce Time t
RES_DEB
V
RESETI
falling 25
Fs
EFFICIENCY vs. I
LOAD
(SKIP MODE)
MAX16974 toc01
I
LOAD
(C)
EFFICIENCY (%)
0.010.0010.0001
10
20
30
40
50
60
70
80
90
100
0
0.00001 0.1
V
SUP
= 14V
5V/400kHz
5V/2.2MHz
EFFICIENCY vs. I
LOAD
MAX16974 toc02
I
LOAD
(A)
EFFICIENCY (%)
10.1
10
20
30
40
50
60
70
80
90
100
0
0.01 10
V
SUP
= 14V
5V/400kHz
5V/2.2MHz
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX16974 toc03
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
262420 2210 12 14 16 188
10
20
30
40
50
60
70
80
90
100
0
6 28
5V/400kHz
5V/2.2MHz
SHUTDOWN CURRENT
vs. INPUT VOLTAGE
MAX16974 toc04
INPUT VOLTAGE (V)
SHUTDOWN CURRENT (µA)
262420 228 10 12 14 16 186
1
2
3
4
5
6
7
8
9
10
11
12
13
14
0
4 28
T
A
= -40°C
T
A
= +25°C
T
A
= +125°C
STARTUP INTO HEAVY LOAD
MAX16974 toc05
0V
2A/div
SF = 400kHz
5V/div
5V/div
0A
0V
V
SUP
V
OUT
I
LOAD
10ms/div