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A8591 PDF Datasheet ( 特性, スペック, ピン接続図 )

部品番号 A8591
部品説明 2A Buck Regulator Family
メーカ Allegro
ロゴ Allegro ロゴ 



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A8591 Datasheet, A8591 PDF,ピン配置, 機能
A8591
Wide Input Voltage, 2 A Buck
Regulator Family with Low-IQ Mode
FEATURES AND BENEFITS
• Automotive AEC-Q100 qualified
• Withstands surge input to 40 VIN for load dump
• Operates down to 3.4 VIN (typ), 3.6 VIN (max) for idle stop
• Utilizes pulse-frequency modulation (PFM) for low-IQ mode
10 μA Sleep mode (automatic PWM / Low-IQ PFM
mode selection)
• Fixed output voltage options: 3.3 or 5 V with ±1%
accuracy
• Delivers up to 2 A of output current
Integrated 110 mΩ high-side MOSFET
• Adjustable switching frequency from 300 kHz to 2.4 MHz
• EMI reduction features:
□Frequency dithering
□Controlled switching node
• External synchronization capability
• Maximum duty cycle for low dropout
• Active low NPOR output with 7.5 ms delay
• Pre-bias startup capable: VOUT increases monotonically,
will not cause a reset
Continued on the next page…
PACKAGE:
10-Pin, 3 × 3 mm Wettable Flank DFN
with Exposed Thermal Pad (suffix EJ)
Not to scale
DESCRIPTION
TheA8591 is designed to provide the power supply requirements
of next generation car audio and infotainment systems.
The A8591 provides all the control and protection circuitry
to produce a high-current regulator with ±1% output voltage
accuracy.
The A8591 employs current-mode control to provide simple
compensation, excellent stability, and fast transient response.
The A8591 employs pulse-frequency modulation (PFM) to
draw less than 33 µA from 12 VIN while supplying 5 V/40 µA
(A8591, 5 VOUT), or less than 24 μA from 12 VIN while
supplying 3.3 V/40 μA(A8591-1, 3.3 VOUT).When operational,
the A8591 operates down to at least 3.6 VIN (VIN falling). The
Sleep feature allows for very low standby current.
Features of the A8591 include a programmable PWM
switching frequency. The regulator switching frequency can
be synchronized to an external clock. The A8591 has external
compensation to optimize stability and transient response for
a wide range of external components and applications. The
A8591 has a fixed soft-start time of 5 ms.
Continued on the next page…
APPLICATIONS:
• Automotive:
□Instrument clusters
□Audio systems
□Navigation
□HVAC
• Home audio
• Network and telecom
• Industrial
A8591-DS
V
IN
SYNC
R
FSET
1
VIN
C
IN
2
VIN
8
GND
9
SW
A8591
10
BOOT
5
VOUT
C
BOOT
47 nF
L
O
D1
2 A/40 V
V
OUT
C
O
3
EN/SLEEP
4
FSET /SYNCPWM
7
COMP
R
PU
6
NPOR
NPOR
C
P
R
Z
See Table 2 for recommended component values
C
Z
Typical Application Diagram

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