A8585 Datasheet, PDF (1/35 Pages) Allegro MicroSystems – Automotive AEC-Q100 qualified

A8585
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
• Function options:
– Selectable PWM / Low IQ PFM mode, or
– Selectable 10 μA Sleep mode (automatic PWM / Low IQ
PFM mode selection)
• Fixed output voltage options: 3.3 V or 5 V with ±1.0%
accuracy
• Delivers up to 2.0 A of output current
• Integrated 110 mΩ high-side MOSFET
• Adjustable switching frequency from 300 to 550 kHz (to
605 kHz with sync)
• EMI Reduction Features:
– Frequency dithering
– Controlled switching node
• External synchronization capability
Description
The A8585 family is designed to provide the power supply
requirements of next generation car audio and infotainment
systems. The A8585 family provides all the control and
protection circuitry to produce a high current regulator with
±1.0% output voltage accuracy.
In PWM mode, the A8585 family employs current mode
control to provide simple compensation, excellent stability,
and fast transient response. In Low IQ mode, the A8585
family employs pulse frequency modulation (PFM) to draw
less than 33 µA from 12 V_IN while supplying 5.0 V/40 µA.
When operational, the A8585 family operates down to at least
3.6 V_IN (V_IN falling). The selectable Sleep mode feature allows
for very low standby current.
Features of the A8585 family include a programmable PWM
switching frequency. The regulator switching frequency can
be synchronized to an external clock. The A8585 has external
compensation to optimize stability and transient response for
a wide range of external components and applications. The
A8585 has a fixed soft start time of 5 ms.
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Package: 10-pin SOIC with exposed
thermal pad (suffix LK)
Not to scale
Applications:
• Automotive:
▫ Instrument Clusters
▫ Audio Systems
▫ Navigation
▫ HVAC
• Home audio
• Network and telecom
• Industrial
V_IN
[A8585-2, -3
only]
Typical Application Diagram
1
VIN
9
SW
C_IN
2
VIN
A8585-x
10
BOOT
8
GND
5
VOUT
C_BOOT
47 nF
L_O
D1
2 A/40 V
V_OUT
C_O
SYNC
R_FSET
3 PWM/PFM [A8585, -1]
EN/SLEEP [A8585-2, -3]
4
FSET /SYNC_PWM
7
COMP
R_PU
6
NPOR
NPOR
C_P
R_Z
See table 2 for recommended component values
C_Z
A8585-DS