A8590 Datasheet, PDF (1/38 Pages) Allegro MicroSystems – Wide Input Voltage, 2.4 MHz, 3.0 A Asynchronous Buck Regulator With Low-IQ Standby, Sleep Mode, External Synchronization, and NPOR Output

A8590
Wide Input Voltage, 2.4 MHz, 3.0 A Asynchronous Buck Regulator With Low-IQ
Standby, Sleep Mode, External Synchronization, and NPOR Output
FEATURES AND BENEFITS
• Automotive AEC-Q100 qualified
• Withstands surge voltages up to 40 V
• Operates as low as 3.4 V_IN (typ) with V_IN decreasing
• Utilizes pulse frequency modulation (PFM) to draw only
tens of microamperes from VIN while maintaining keep-
alive VOUT
• PWM/PFM mode control input pin
• Delivers up to 3.0 A of output current with integrated 110
mΩ high voltage MOSFET
• SLEEP input pin commands ultra-low current shutdown
mode
• Adjustable output voltage with ±1.0% accuracy from
0°Cto 85°C, ±1.5% from –40°C to 150°C
• Programmable switching frequency: 250 kHz to 2.4 MHz
• Synchronization capability: applying a clock input
to thePWM/PFM input pin will increase the PWM
frequency
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Package: 16-Pin TSSOP with Exposed
Themal Pad (suffix LP)
Not to scale
DESCRIPTION
Designed to provide the power supply requirements of next
generation car audio and infotainment systems, the A8590
provides all the control and protection circuitry to produce a
high current regulator with ±1.0% output voltage accuracy.
The A8590 employs pulse frequency modulation (PFM) to
draw less than 50 μA from 12 V_IN while supplying 3.3 V/40
μA. After startup, the A8590 operates down to at least 3.6 V_IN
(V_IN falling).
Features of theA8590 include a PWM/PFM mode control input
to enable PWM (logic high) or PFM (logic low). If the PWM/
PFM input is driven by an external clock signal higher than the
base frequency (f_OSC) the PWM frequency synchronizes to the
incoming clock frequency. The SLEEP input pin commands
an ultra-low current shutdown mode requiring less than 5 μA
for internal circuitry and 10 μA (max) for MOSFET leakage
at 16 V_IN , 85ºC. The A8590 has external compensation
to accommodate a wide range of frequencies and external
components, and provides a power-on reset (NPOR) signal
validated by the output voltage. The A8590 utilizes Enhanced
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APPLICATIONS
• Automotive:
□□Instrument Clusters
□□Audio Systems
• Home audio
□□Navigation
□□HVAC
V
IN
R
Z
CC
P
Z
EN
Mode
A8590-DS, Rev. 2
1
VIN
2
C
IN
VIN
5
13
GND
9
COMP
3
SS
8
FSET
C
R
FSET
C
12
VREG
SS
VREG
A8590
4
SLEEP
6
PWM/PFM
16
BOOT
15
SW
14
SW
11
BIAS
10
FB
C
BOOT
L
0
D
1
R
FB1
R
FB2
C
FB
7
NPOR
Typical Application Diagram
VOUT
C
O
3.3 v
R
PU
10 KW