Datasheet

Automotive Power-Management IC with
Three Step-Down Converters and Linear Regulator
MAX16920
8
Pin Configuration
Pin Description
MAX16920
TQFN
TOP VIEW
29
30
28
27
12
11
13
V
L
OUT1
FB1
OUT2
FB2
14
ENA
UVI OUT3 FB3 EN3 PGNDA LX3
1 2
SYNC
4 5 6 7
2324 22 20 19 18
PG3
PG2
LX2
PGNDB
LX1
V
INA
GND
UVS
3
21
31
10
PGA
BST1
32
9
ODRV
EP*
+
*CONNECT TO GND.
26
15
V
INB
25
16
BST2
OUTA
BST3
8
17
EN2
0T
UVO
POR
PIN NAME FUNCTION
1 ENA LDO Enable Input. Drive ENA high to enable the LDO (OUTA). Drive low to disable the LDO.
2 V
L
Internal Regulator Output. Bypass V
L
to GND with a 4.7FF capacitor.
3 GND Ground
4 OUT1
DC-DC1 Converter Output. OUT1 supplies internal circuitry in standby mode reducing overall
current consumption. Connect a 0.1FF capacitor from OUT1 to GND as close as possible to the IC.
If the DC-DC1 output is pulled below its power-on-reset threshold (POR), DC-DC2 and DC-DC3 are
automatically disabled.
5 FB1
DC-DC1 Converter Feedback Input. Connect FB1 to GND for a fixed 3.3V output. Connect to a
resistive divider to adjust the output voltage between 1.22V and 5.5V.
6 OUT2 DC-DC2 Converter Output
7 FB2
DC-DC2 Converter Feedback Input. Connect FB2 to GND for a fixed 5V output. Connect to a
resistive divider to adjust the output voltage between 1.22V and 5V.
8 OUTA
5V Linear Regulator Output. Connect an external capacitor of at least 4.7FF from OUTA to GND.
9 ODRV
External pMOS Output Drive Signal. ODRV turns off the pMOS during overvoltage events. If only
DC-DC1 is running, the overvoltage circuit is disabled and the external pMOS is turned off.
10 BST1
Bootstrap Capacitor Connection for DC-DC1. Connect a 0.47FF capacitor from BST1 to LX1.
11 V
INA
Battery Supply-Voltage Input. V
INA
supplies power to the V
L
regulator, the LDO, and DC-DC1.
12 LX1
DC-DC1 Converter Switching Node. Connect an LC filter to LX1. Use a capacitor with a maximum
ESR of 0.3I. Unless there is an undervoltage lockout, DC-DC1 is always on when power is applied.