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A4450 の電気的特性と機能

A4450のメーカーはAllegroです、この部品の機能は「Buck-Boost Controller」です。


製品の詳細 ( Datasheet PDF )

部品番号 A4450
部品説明 Buck-Boost Controller
メーカ Allegro
ロゴ Allegro ロゴ 




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A4450 Datasheet, A4450 PDF,ピン配置, 機能
A4450
Buck-Boost Controller with Integrated Buck MOSFET
FEATURES AND BENEFITS
• Automotive AEC-Q100 qualified
• Wide operating range of 3 to 36 VIN, 40 VIN maximum,
covers automotive stop/start, cold crank, double battery,
and load dump
• Regulated output can range from 3 to 8 V at up to 1 A DC
• Adjustable PWM switching frequency:
250 kHz to 2.2 MHz
• PWM frequency can be synchronized to external clock:
250 kHz to 2.4 MHz
• Frequency dithering helps reduce EMI/EMC
• Undervoltage protection
• Pin-to-pin and pin-to-ground tolerant at every pin
• Thermal shutdown protection
Operating junction temperature range −40°C to 150°C
PACKAGES:
20-pin 4 × 4 mm QFN (ES) with wettable flank
Not to scale
DESCRIPTION
The A4450 is a power management IC that can implement
either a buck or buck-boost regulator to efficiently convert
automotive battery voltages into a tightly regulated voltage. It
includes control, diagnostics, and protection functions.
An enable input to the A4450 is compatible to a high-voltage
battery level, (EN).
A diagnostic output from the A4450 includes a power-on reset
output (NPOR) signal.
Protection features include pulse-by-pulse current limit, hiccup
mode short-circuit protection, LX short-circuit protection,
missing freewheeling diode (buck diode at LX node in A4450)
protection, and thermal shutdown.
The A4450 is most suitable for applications where the input
voltage can vary from less than or greater than the regulated
output voltage.
The A4450 is supplied in 4 × 4 mm QFN (suffix “ES”) with
exposed power pad.
APPLICATIONS
• Infotainment
• Instrument Clusters
• Control Modules
VBAT
VIN
A4450-DS
VIN
VIN
AVIN
COMP
A4450
FSET /SYNC
SS
EN
BOOT
LX
LX
LG
FB
RNG
NPOR
GND
PGND
D1
Buck
Diode
Typical Application Diagram
D2 Boost
Diode
VOUT

1 Page





A4450 pdf, ピン配列
A4450
Buck-Boost Controller
with Integrated Buck MOSFET
PINOUT DIAGRAM AND TERMINAL LIST TABLE
VIN
VIN
GND
EN
NC
1
2
3
4
5
15 FB
14 COMP
13 NC
12 GND
11 SS
Terminal List Table
Symbol
Number
VIN 1, 2
GND
3, 7, 12
EN
NC
AVIN
4
5, 13
6
FSET/SYNC
RNG
NPOR
SS
COMP
FB
LG
PGND
BOOT
LX
8
9
10
11
14
15
16
17
18
19, 20
Package ES, 20-Pin QFN Pinout Diagram
Function
Input voltage; ensure decoupling capacitors are connected directly to this pin.
Ground pin for decoupling and ground connection.
Enable pin; 40 V rated and logic level compatible; can be connected to VIN or switching battery.
Used to turn the regulator on or off: set pin high to turn the regulator on or set pin low to turn the regulator off. Can be
used to set UVLO threshold with external resistor divider.
No connection.
Input to internal voltage regulator and boost duty generator; must connect to VIN through a resistor (5 Ω typ) and a
capacitor is suggested to be added between AVIN pin and GND to form a RC filter.
Frequency setting and synchronization input. Switching frequency is programmed by connecting a resistor from
this pin to ground. This pin can also accept a square wave switching signal that synchronizes the converter through
internal PLL.
Output range select pin. A resistor connected between RNG pin and GND is selected base on the target VOUT.
Active-low power-on reset output signal. This pin is an open-drain regulator fault detection output that transitions from
low to high impedance after the output has maintained regulator for tdNPOR.
A capacitor from this pin to GND sets the soft-start time. This capacitor also determines the hiccup period.
Error amplifier compensation network pin. Connect series RC network from this pin to ground for loop compensation to
stabilize the converter.
Feedback pin for output. Connect a voltage divider from the output to this pin to program the output voltage.
Gate drive output for the external boost switch. Connect a 10 kΩ resistor from this pin to PGND.
Power ground. Provide power ground return for drivers.
Bootstrap capacitor connection. Connect a capacitor from this pin to LX pin. This pin provides supply voltage for the
high-side and low-side gate drivers.
Switching node of the regulator; the output inductor and cathode of the buck diode should be connected to this pin
with relatively wide traces. The inductor and buck diode should be placed as close as possible to this pin.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3


3Pages


A4450 電子部品, 半導体
A4450
Buck-Boost Controller
with Integrated Buck MOSFET
ELECTRICAL CHARACTERISTICS (continued): Valid at 3 V ≤ VIN ≤ 36 V and VIN having first reached VINSTART,
‒40°C ≤ TJ ≤ 150°C, unless noted otherwise
Characteristics
Symbol
Test Conditions
Min. Typ. Max. Unit
ERROR AMPLIFIER
Open-Loop Voltage Gain
AVOL
– 65 – dB
Transconductance
Output Current
Maximum Output Voltage,
Buck-Boost Mode
gmEA
IEA
VEAVO(max)BuckBoost
550 750 950 µA/V
– ±75 –
µA
– 1.5 –
V
Maximum Output Voltage,
Buck Mode
VEAVO(max)Buck
– 1.2 –
V
Minimum Output Voltage
VEAVO(min)
BOOST MOSFET (LG) GATE DRIVER
150 220 290
mV
LG High Output Voltage
LG Low Output Voltage
LG Source Current 1
LG Sink Current 1
SOFT-START
VLG(ON)
VLG(OFF)
ILG(ON)
ILG(OFF)
VIN = 7 V
VIN = 13.5 V
VLG = 1 V
VLG = 1 V
5.0 – 8.0
– – 0.4
−265
– 500 –
V
V
mA
mA
SS PWM Frequency Foldback
(Linear)
Switching Frequency in SYNC Mode
with Applied Frequency fSYNC
HICCUP MODE
fSW(SS)
fSW(SYNC)
VFB = 0 V
VFB = 0.2 V
VFB = 0.6 V
VFB = 0.8 V
0 V < VFB < 0.2 V
0.2 V < VFB < 0.4 V
0.4 V < VFB
0.12 ×
fOSC
0.43 ×
fOSC
0.93 ×
fOSC
– fOSC
– fSYNC/4 –
– fSYNC/2 –
– fSYNC
Hiccup OCP PWM Counts
tHIC(OCP)
VFB < 0.4 V (typical), VCOMP = VEAVO(max)
VFB > 0.4 V (typical), VCOMP = VEAVO(max)
30
PWM
cycles
120
PWM
cycles
Hiccup Mode Recovery Time
tHIC(RECOVER)
LX switching stops to LX switching starts, during
overcurrent
3.0 – 5.6 ms
CURRENT PROTECTIONS
Pulse-by-Pulse Current Limit,
Buck-Boost Mode
ILIM(BuckBoost) Buck-Boost mode
3.9 4.5 5.1
A
Pulse-by-Pulse Current Limit,
Buck Mode
ILIM(Buck)
Buck mode
2.4 2.8 3.4
A
LX Short-Circuit Current Limit
ILIM(LX)
MISSING BUCK DIODE (D1) PROTECTION
6.3 7.4 8.5
A
Detection Level 2
Time Filtering 2
VD(OPEN)
tD(OPEN)
−1.6
50
−1.4
−1.1
250
V
ns
Continued on the next page…
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6

6 Page



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部品番号部品説明メーカ
A4450

Buck-Boost Controller

Allegro
Allegro


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