A8450KLB Allegro Microsystems Inc, A8450KLB Datasheet

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A8450KLB

Manufacturer Part Number
A8450KLB
Description
IC REG MULTI-OUT AUTO 24-SOIC
Manufacturer
Allegro Microsystems Inc
Type
Step-Down (Buck)r
Datasheet

Specifications of A8450KLB

Topology
Step-Down (Buck) (1), Linear (LDO) (4)
Function
Automotive
Number Of Outputs
4
Voltage/current - Output 1
5.7V, 1.2A
Voltage/current - Output 2
5V, 200mA
Voltage/current - Output 3
5V, 200mA
W/led Driver
No
W/supervisor
No
W/sequencer
Yes
Voltage - Supply
6 V ~ 45 V
Operating Temperature
-40°C ~ 135°C
Mounting Type
Surface Mount
Package / Case
24-SOIC (7.5mm Width)
Current - Output
200mA, 550mA
Voltage - Output
3.3V, 5V, 5.7V, Adj
Voltage - Input
6 ~ 45 V
Internal Switch(s)
Yes
Synchronous Rectifier
No
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-
Frequency - Switching
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
A8450KLB
Manufacturer:
Allegro MicroSystems, LLC
Quantity:
15 188
Part Number:
A8450KLB-T
Manufacturer:
Allegro MicroSystems, LLC
Quantity:
434
Part Number:
A8450KLBTR
Manufacturer:
Allegro MicroSystems, LLC
Quantity:
311
Part Number:
A8450KLBTR-T
Manufacturer:
Allegro MicroSystems, LLC
Quantity:
12 390
Part Number:
A8450KLBTR-T
Manufacturer:
Allegro
Quantity:
1 000
Part Number:
A8450KLBTR-T
Manufacturer:
ALLEGRO
Quantity:
1 000
Features and Benefits
▪ 6 V to 45 V input range
▪ DC-to-DC buck converter with 5.7 V output
▪ Overcurrent protection with foldback, and undervoltage
▪ Dual 5 V outputs
Continued on the next page…
Package: 24 pin SOIC (suffix LB)
Not to scale
A8450-DS, Rev. 6
lockout (UVLO)
▫ Digital 5 V ±2%, 200 mA
▫ Analog 5 V, 200 mA
▫ Short-to-supply protection on analog regulator
▫ Analog to digital regulator output tracking < 0.5%
throughout operating temperature range
VIN
VADJ
Automotive Multioutput Voltage Regulator
CIN
D2
C10
C9
R4
C4
Typical Application
C7
C8
R2
Q2
R1
VBB
CP2
CP1
VCP
VREG11
GND
GND
ENB
CPOR
CLADJ
VADJBD
FB
A8450
H.V.
Description
The A8450 is a multioutput power supply intended for
automotive applications. The A8450 operates from a wide
input supply range and is designed to satisfy the requirements
of high ambient temperature environments.
Four regulated voltage outputs provide multiple options. The
3.3 V regulator and the 1.2 to 3.3 V adjustable regulator can be
used to power microcontroller or DSP cores, or for I/O, sensing,
and A-to-D conversion. Two 5 V outputs, one digital and the
other analog, feature output tracking within 0.5% of each other
over the operating temperature range. In addition, the analog
regulator is protected against short-to-battery conditions. All
four regulators feature foldback current limit protection.
The device can be enabled or disabled using two input pins.
The high voltage input, on the ENBAT pin, allows enable/
disable using an engine ignition or battery switch signal. The
logic-level input, on the ENB pin, allows enable/disable by
microcontroller or DSP signals.
When disabled, the A8450 draws less than 10 μA of current.
A POR (power-on-reset) block monitors the supply voltages
and provides a reset signal, with an adjustable delay, for
Continued on the next page…
NFAULT
ENBAT
V33BD
NPOR
VREG
CL33
GND
GND
V5D
V5A
V33
LX
Q1
D1
COUT
L1
C2
C1
R3
C3
A8450

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A8450KLB Summary of contents

Page 1

Features and Benefits ▪ input range ▪ DC-to-DC buck converter with 5.7 V output ▪ Overcurrent protection with foldback, and undervoltage lockout (UVLO) ▪ Dual 5 V outputs ▫ Digital 5 V ±2%, 200 mA ...

Page 2

... A8450KLBTR* – 1000 pieces per 13-in. reel A8450KLBTR-T Yes *Variant is in production but has been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of the variant is currently restricted to existing customer applications. The variant should not be purchased for new design applications because obsolescence in the near future is probable ...

Page 3

A8450 C8 High Voltage Switch CP1 CP2 VREG11 C10 Charge Pump CPOK ENBAT High V Protection ENB NPOR CPOR Adjustable Delay C9 POR Block NFAULT GND Fault ID C1, C2, C3 μ ceramic X7R COUT 100 ...

Page 4

A8450 ELECTRICAL CHARACTERISTICS Characteristics Supply Quiescent Current Regulated Output Voltage Buck Switch On-Resistance Buck Switch Current Limit DC-to-DC Fixed Off-Time Soft Start Time Logic Inputs ENBAT Logic Input Voltage ENBAT Input Current ENB Logic Input Voltage ENB Input Current * ...

Page 5

A8450 ELECTRICAL CHARACTERISTICS (continued) otherwise noted Characteristics Protection NFAULT, NPOR Output Voltage NFAULT, NPOR Leakage Current POR Delay V33 Undervoltage Threshold V33 Hysteresis V5A, V5D Undervoltage Threshold V5A, V5D Hysteresis VADJ Undervoltage Threshold VADJ Hysteresis VADJ, V33 Overcurrent Threshold VREG ...

Page 6

A8450 V REG V OUTV33 V OUTVADJ V NPOR Slope of V OUTV33 Figure 1a. NPOR fault due to undervoltage lockout on the V33 or FB pins V V REG V OUTV33 VREG Monitor V OUTVADJ V ENBAT V ENB ...

Page 7

A8450 LOAD 10% t RISE t (0.2 μs/Div.) V5D Regulator t (50 μs/Div.) V5A Regulator t (50 μs/Div.) Automotive Multioutput Voltage Regulator Load Transients Diagrams = 100 mA 25°C; ac-coupled; C1, ...

Page 8

A8450 Buck Converter with Switching Regulator. A current- mode, variable frequency buck DC-to-DC converter and switch- ing regulator are integrated in the A8450, as shown in figure 2. This feature allows the device to efficiently handle power over a wide ...

Page 9

A8450 mA, as shown in figure 4a. The voltage recovers to its regulated output when the short is removed. The V5A and V5D regulators track each other during power-on, and when the device is enabled ...

Page 10

A8450 low, ENB acts as a single reset control. Diagnostics. An open drain output, through the NFAULT pin, is pulled low to signal to a DSP or microcontroller any of the follow- ing fault conditions: • V5A, the 5 V ...

Page 11

A8450 Component Selection This inductor must be rated to handle the Output Inductor (L1). total load current addition, the value chosen must keep LOAD the ripple current to a reasonable level. A typical selection is a power ...

Page 12

A8450 mended, with a minimum voltage rating However, because ESR decreases with voltage, the most cost-effective choice may be a capacitor with a higher voltage rating. Regulator Output Capacitors (C3 and C4). The output capacitors used with ...

Page 13

A8450 P can be used to estimate the minimum required operating D temperature rating for the transistor. The ability of a package to dissipate heat is approximated by the thermal resistance from the die (junction) to the ambient environment, R ...

Page 14

A8450 Test results for this 24-lead SOIC are approximately 35 °C/W when mounted on a high-thermally conductive PCB (based on the JEDEC standard PCB, having four layers with buried copper areas). The total power that can be applied to the ...

Page 15

A8450 Terminal List Table Name VBB CP2 CP1 VCP VREG11 GND GND ENB CPOR CLADJ VADJBD FB V5A NPOR NFAULT V5D VREG GND GND CL33 V33BD V33 ENBAT LX Automotive Multioutput Voltage Regulator Pin-Out Diagram Buck VBB 1 Converter CP2 ...

Page 16

A8450 15.40±0. 24X 0.10 C 0.41 ±0.10 1.27 For reference only Pins 6 and 7, and 18 and 19 internally fused Dimensions in millimeters (Reference JEDEC MS-013 AD) Dimensions exclusive of mold flash, gate burrs, and ...

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