Datasheet

Automotive Power-Management IC with
Three Step-Down Converters and Linear Regulator
MAX16920
7
Typical Operating Characteristics (continued)
(V
INA
= V
INB
= 14V, T
A
= +25°C, unless otherwise noted. Data measured on MAX16920B, see Figure 5 for application circuit.)
DC-DC1 EFFICIENCY vs. LOAD CURRENT
MAX16920 toc16
I
OUT1
(mA)
EFFICIENCY (%)
100101
10
20
30
40
50
60
70
80
90
100
0
0.1 1000
V
IN
= 8V
V
IN
= 14V
V
IN
= 18V
EN2 = EN3 = ENA = GND
ODRV SWITCH ON/OFF
SB_OUT IS THE “DRAIN” SIDE OF THE
EXTERNAL pMOS CONNECTED AT ODRV
MAX16920 toc15
V
IN_
V
ODRV
V
SB_OUT
(100kI
LOAD AT
SB_OUT)
100ms/div
10V/div
10V/div
10V/div
0V
0V
LDOA STARTUP INTO FULL LOAD
MAX16920 toc22
V
ENA
V
OUTA
I
OUTA
V
PGA
100µs/div
5V/div
50mA/div
2V/div
5V/div
DC-DC3 STARTUP INTO FULL LOAD
MAX16920 toc21
V
EN3
V
OUT3
I
OUT3
V
PG3
1ms/div
5V/div
1A/div
2V/div
5V/div
DC-DC2 STARTUP INTO FULL LOAD
MAX16920 toc20
V
EN2
V
OUT2
I
OUT2
V
PG2
1ms/div
5V/div
200mA/div
2V/div
5V/div
DC-DC1 STARTUP INTO FULL LOAD
MAX16920 toc19
V
IN
V
OUT1
I
OUT1
V
POR
2ms/div
10V/div
100mA/div
2V/div
2V/div
DC-DC3 EFFICIENCY vs. LOAD CURRENT
MAX16920 toc18
I
OUT3
(A)
EFFICIENCY (%)
1.351.200.90 1.050.45 0.60 0.750.30
10
20
30
40
50
60
70
80
90
100
0
0.15 1.50
V
IN
= 8V
V
IN
= 14V
V
IN
= 18V
EN2 = ENA = GND
DC-DC2 EFFICIENCY vs. LOAD CURRENT
MAX16920 toc17
I
OUT2
(mA)
EFFICIENCY (%)
540480360 420180 240 300120
10
20
30
40
50
60
70
80
90
100
0
60 600
V
IN
= 8V
V
IN
= 14V
V
IN
= 18V
EN3 = ENA = GND