Operating Temperature Range ........................ -40°C to +125°C
Junction Temperature .....................................................+150°C
Storage Temperature Range............................ -65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
Soldering Temperature (reflow) ......................................+260°C
PACKAGE_THERMAL_CHARACTERISTICS_(Note_1)
TQFN
Junction-to-Ambient Thermal Resistance (q
JA
) ..........27°C/W
Junction-to-Case Thermal Resistance (q
JC
) .................1°C/W
Note_1:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to
www.maxim-ic.com/thermal-tutorial.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL_CHARACTERISTICS
(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
V
INA
/V
INB
Operating Supply
Range
V
INA
/V
INB
Supply Current in
Operation
V
INA
/V
INB
Supply Current,
Standby Mode
V
L
Undervoltage Lockout
V
L
Undervoltage Lockout
Hysteresis
V
L
Output Voltage
UVI Threshold
UVI Input Current
UVI Hysteresis
UVS Switch Resistance
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
OVERVOLTAGE_GATE_DRIVER
Overvoltage Shutdown Level
Overvoltage Shutdown Level
V
OV
V
OV,F
Input voltage rising, ODRV output
turns off external pMOSFET
Input voltage falling
18.7
18.1
19.2
19.7
V
V
SYMBOL
V
IN
CONDITIONS
Full performance
DC-DC1 maintains regulation,
I
OUT1
= 100mA (Note 2)
EN2 = EN3 = ENA = high, no
switching
Only DC-DC1 operating, EN2 = EN3
= ENA = low, I
OUT1
= no load
V
L
rising
2.9
MIN
5.5
4
2
25
3.15
0.4
5
V
INA
/V
INB
falling
V
UVI
= 1.2V
10
1100
Temperature rising,
OT
output
asserted (Note 3)
(Note 3)
155
20
1540
170
10
20
1.181
(-2%)
1.205
1.229
(+2%)
1
30
2100
TYP
MAX
18
28
3
50
3.4
V
UNITS
I
IN
I
ST
V
UVL
V
UVH
V
L
UVL
I
UVI
UVH
R
UVS
T
S
T
H
mA
FA
V
V
V
V
FA
mV
I
NC
NC
2
Automotive Power-Management IC with
Three Step-Down Converters and Linear Regulator
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
ODRV Positive Output Drive
Resistance
ODRV Negative Output Drive
Resistance
DC-DC_CONVERTERS
Free-Running Switching
Frequency Range
f
SWITCHI
SYNC = GND, MAX16920A
SYNC = GND, MAX16920B
MAX16920A: switching frequency is
half of f
SYNC
(Note 3)
MAX16920B: switching frequency is
equal to f
SYNC
(Notes 3, 4)
Output in regulation,
5.5V < V
IN_
< 18V
Output rising for OUT2 and OUT3
360
1980
600
1800
1.196
(-2%)
88.5
1.22
400
2200
440
2420
1000
kHz
2400
1.244
(+2%)
94.5
V
% of
V
OUT
(NOM)
MAX16920
SYMBOL
R
DRV+
R
DRV-
Turning off
Turning on
CONDITIONS
MIN
TYP
2000
2000
MAX
UNITS
I
I
kHz
SYNC Input Frequency Range
f
SYNC
FB_ Voltage
V
FB_
Power-Good Threshold
Power-Good Threshold Hysteresis
POR
Threshold
POR
Threshold Hysteresis
PGT
PGTH
POR
PORH
91.5
3
%
94.5
% of
V
OUT
(NOM)
OUT1 rising
88.5
91.5
3
%
5.6
8.25
9
3
1.55
I
I
V
I
I
V
I
I
V
mA
mA
mA
3
ms
MAX16920A
POR
Output Delay
t
POR
Spread-spectrum
disabled
Spread-spectrum
enabled
4.6
6.75
7
5.1
7.5
8
MAX16920B
DC-DC1 High-Side Switch R
DSON
DC-DC1 Low-Side Switch R
DSON
DC-DC1 V
OUT1
Accuracy
DC-DC2 High-Side Switch R
DSON
DC-DC2 Low-Side Switch R
DSON
DC-DC2 V
OUT2
Accuracy
DC-DC3 High-Side Switch R
DSON
DC-DC3 Low-Side Switch R
DSON
DC-DC3 V
OUT3
Accuracy
DC-DC1 Output Current Limit
DC-DC2 Output Current Limit
DC-DC3 Output Current Limit
R
1H
R
1L
V1
R
2H
R
2L
V2
R
3H
R
3L
V3
I
LIM1
I
LIM2
I
LIM3
4.5V < V
INB
< 18V; I
OUT3
= 500mA
6V < V
INB
< 18V; I
OUT3
P
1.5A
Peak current limit
Peak current limit
Peak current limit
-3%
240
960
1920
3.3
300
1200
2400
6V < V
INB
< 18V, I
OUT2
< 600mA,
FB2 connected to GND
5.5V < V
INB
< 18V, I
OUT2
= 400mA
-3%
5
I
OUT1
< 150mA, FB1 connected to
GND, 6V < V
INA
< 18V
-3%
3.3
+3%
1.7
0.64
+3%
0.7
0.3
+3%
360
1440
2880
Automotive Power-Management IC with
Three Step-Down Converters and Linear Regulator
MAX16920
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
DC-DC Load Regulation
SYMBOL
LoREG
CONDITIONS
DC-DC1 (0 to 150mA)
DC-DC2 (0 to 600mA)
DC-DC3 (0 to 1.5A)
DC-DC1, V
INA
, V
INB
= 6V to 18V,
I
OUT1
= 15mA
DC-DC Line Regulation
LiREG
DC-DC2, V
INA
, V
INB
= 6V to 18V,
I
OUT2
= 60mA
DC-DC3, V
INA
, V
INB
= 6V to 18V,
I
OUT3
= 150mA
MAX16920A
Soft-Start Time
t
SS
Spread-spectrum
disabled
Spread-spectrum
enabled
8.5
6.5
6.75
3
11
MIN
TYP
1
1.5
2.5
3
5
3
10
7.5
8
11.5
8.5
9.25
97
96
18
V
8
10
%
%
ms
mV/V
%
MAX
UNITS
MAX16920B
Duty-Cycle Range (Note 3)
DCR
MAX16920A
MAX16920B
MAX16920A, limited by minimum
duty cycle, DC-DC2 and DC-DC3
only
MAX16920B, limited by minimum
duty cycle, DC-DC2 and DC-DC3
only
Spread-spectrum option only
Output in regulation, I
OUTA
< 100mA,
V
INA
= 6V to 18V
No load (excludes DC-DC_ operating
current)
Output rising
Input Voltage to Maintain
Constant Switching with
V
OUT_
= 1.22V
(Note 3)
Spread-Spectrum Range
LINEAR_REGULATOR_(LDO)
Output Voltage
Operating Current
V
INDCL
SS
V
OUTA
I
CCA
4.85
5
100
5.15
V
FA
% of
V
OUTA
(nom)
%
mA
V
mV
mV/V
Power-Good Threshold
Power-Good Threshold Hysteresis
Output Current Limit
Dropout Voltage
Load Regulation
Line Regulation
LOGIC_LEVELS
POR,
PG_,
OT,
and
UVO
Output
Voltage Low
PGTA
PGTAH
I
LIMA
V
DA
DI
DV
88.5
91.5
2
94.5
200
V
INA
= 5V, I
LDOA
= 100mA (Note 3)
I
OUTA
= 5mA to 100mA
V
INA
= 6V to 18V, I
OUTA
= 50mA
30
0.05
300
0.5
V
OL
Sink current = 1mA
0.4
V
4
Automotive Power-Management IC with
Three Step-Down Converters and Linear Regulator
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
EN2, EN3, ENA, SYNC Input Low
Voltage
EN2, EN3, ENA, SYNC Input High
Voltage
EN2, EN3, ENA, SYNC Input
Hysteresis
SYNC Input Pulldown Resistor
SYMBOL
V
IL
V
IH
V
H
RSYNC
100
1.7
200
200
360
CONDITIONS
MIN
TYP
MAX
0.4
UNITS
V
V
mV
kI
MAX16920
Note_2:
Operation at voltages outside the 5.5V to 18V range is guaranteed, but some parameters may be out of specification.
Note_3:
Not production tested.
Note_4:
The MAX16920BATJ/V+ with spread-spectrum disabled has a typical switching frequency of 2.2MHz, while the
MAX16920BATJS/V+ is centered at 2.025MHz typically.
Typical Operating Characteristics
(V
INA
= V
INB
= 14V, T
A
= +25°C, unless otherwise noted. Data measured on MAX16920B, see Figure 5 for application circuit.)
PCB设计
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