A4406
Constant On-Time Buck Regulator
With One External and One Internal Linear Regulator
Description
Features and Benefits
TheA4406 is an automotive power management IC that uses a
highfrequencyconstanton-time5.45Vpre-regulatortosupply
aninternal5Vlinearregulatoranda3.3VlinearDMOSdriver.
Designed to supply CAN and microprocessor power supplies
inhightemperatureenvironments, theA4406isidealforunder
hood applications. Efficient operation is achieved by using a
buck pre-regulator to efficiently drop the input voltage before
supplying the linear regulators; this reduces power dissipation
and increases overall regulator efficiency.
• AEC Q100 Grade 0 qualified
• Internal buck pre-regulator followed by LDO outputs
• 5.5 to 36 V VIN operating range (50 V maximum);
for start/stop, cold crank, and load dump requirements
• 2.2 MHz constant on-time buck regulator
• 50 V absolute maximum input voltage for surges
• Valley current sensing achieves shortest buck on-times
• 5.5 to 46 V input voltage range
• −40ºC to 150ºC junction temperature range
• Power-on reset (NPOR pin) with adjustable rising delay
• 5 V (V5P pin) internal low dropout tracking
linear regulator with both overcurrent foldback and
short-to-battery protection
The switching regulator is capable of operating at a nominal
switchingfrequencyof2.2MHz.Thehighswitchingfrequency
enables the customer to select low value inductors and ceramic
capacitors while avoiding EMI in the AM frequency band.
• 3.3 V (V33 pin) external linear regulator DMOS driver
with a programmable current limit (up to 500 mA) and
Continued on the next page…
Protection features include undervoltage lockout and thermal
shutdown. The V5P output is protected from short-to-battery
events. In case of a shorted load, all regulators feature
Package: 20-pin TSSOP with exposed
thermal pad (suffix LP)
Continued on the next page…
Applications:
Automotive Control Modules, such as:
• Electronic power steering (EPS)
• Transmission control (TCU)
• Antilock braking (ABS)
• Emissions control
Not to scale
Typical Application Circuit
VBAT
0.22 μF
0.22 μF
RTON
CIN2
DIN
CIN1
412 kΩ
B240A
4.7 μF
4.7 μF
3.3 V
3.3 V
4.7 kΩ
4.7 kΩ
LX
NPOR
CPOR
DBUCK
B240A
ISEN–
ISEN+
VREG
RSENSE
300 mΩ
L1
C
CPOR
10 μH, 1.3 A
65 mΩ MAX
A4406
0.22 μF
1
/
4 W
ENBATS
RCL
390 mΩ
4 W
100 Ω
C
VREG
10 μF
VIGN 1 kΩ
100 nF
ENBAT
PAD
1
/
CLV33
RDROP
1.2 Ω
Enable
0.47 μF
ENB
V5P
1
/2 W
VIN(Pin1)
A
D2
5 V
B240A
QV33
40 °C/W
175°C MAX
Protected
G33
V33
V5P
C
V5P
D1
B240A
3.3 V, 400 mA
(500 mA MAX)
1 to 2.2 μF
C
V33
1 to 4.7 μF
ProtecƟon diodes D1 and D2 are required when the V5P pin is driving a wiring harness (or excessively long
PCB trace) where parasiƟc inductance will cause the voltage at the V5P to momentarily transiƟon above
VIN or below ground during a fault condiƟon.
A
A4406-DS, Rev. 1
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