Datasheet

Automotive Power-Management IC with
Three Step-Down Converters and Linear Regulator
MAX16920
3
ELECTRICAL CHARACTERISTICS (continued)
(V
INA
= V
INB
= 14V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ODRV Positive Output Drive
Resistance
R
DRV+
Turning off 2000
I
ODRV Negative Output Drive
Resistance
R
DRV-
Turning on 2000
I
DC-DC CONVERTERS
Free-Running Switching
Frequency Range
f
SWITCHI
SYNC = GND, MAX16920A 360 400 440
kHz
SYNC = GND, MAX16920B 1980 2200 2420
SYNC Input Frequency Range f
SYNC
MAX16920A: switching frequency is
half of f
SYNC
(Note 3)
600 1000
kHz
MAX16920B: switching frequency is
equal to f
SYNC
(Notes 3, 4)
1800 2400
FB_ Voltage V
FB_
Output in regulation,
5.5V < V
IN _
< 18V
1.196
(-2%)
1.22
1.244
(+2%)
V
Power-Good Threshold PGT Output rising for OUT2 and OUT3 88.5 91.5 94.5
% of
V
OUT
(NOM)
Power-Good Threshold Hysteresis PGTH 3 %
POR Threshold POR
OUT1 rising 88.5 91.5 94.5
% of
V
OUT
(NOM)
POR Threshold Hysteresis PORH
3 %
POR Output Delay
t
POR
MAX16920A 4.6 5.1 5.6
ms
MAX16920B
Spread-spectrum
disabled
6.75 7.5 8.25
Spread-spectrum
enabled
7 8 9
DC-DC1 High-Side Switch R
DSON
R
1H
3
I
DC-DC1 Low-Side Switch R
DSON
R
1L
1.55
I
DC-DC1 V
OUT1
Accuracy V1
I
OUT1
< 150mA, FB1 connected to
GND, 6V < V
INA
< 18V
-3% 3.3 +3% V
DC-DC2 High-Side Switch R
DSON
R
2H
1.7
I
DC-DC2 Low-Side Switch R
DSON
R
2L
0.64
I
DC-DC2 V
OUT2
Accuracy V2
6V < V
INB
< 18V, I
OUT2
< 600mA,
FB2 connected to GND
-3% 5 +3% V
5.5V < V
INB
< 18V, I
OUT2
= 400mA
DC-DC3 High-Side Switch R
DSON
R
3H
0.7
I
DC-DC3 Low-Side Switch R
DSON
R
3L
0.3
I
DC-DC3 V
OUT3
Accuracy V3
4.5V < V
INB
< 18V; I
OUT3
= 500mA
-3% 3.3 +3% V
6V < V
INB
< 18V; I
OUT3
P 1.5A
DC-DC1 Output Current Limit I
LIM1
Peak current limit 240 300 360 mA
DC-DC2 Output Current Limit I
LIM2
Peak current limit 960 1200 1440 mA
DC-DC3 Output Current Limit I
LIM3
Peak current limit 1920 2400 2880 mA