A8584 Datasheet, PDF (1/32 Pages) Allegro MicroSystems – The A8584 is an adjustable frequency, high output current, PWM regulator that integrates a low resistance, high-side, N-channel MOSFET.

A8584
Wide Input Voltage, 500 kHz , 2.5 A
Asynchronous Buck Regulator
Features and Benefits
• Wide operating voltage range: 4.7 to 36 V
• UVLO stop threshold is at 3.8 V (typ)
• Supports 40 V input for surge and load dump testing
• Adjustable output voltage as low as 0.8 V
• Internal 800 mV reference with ±1.5% accuracy
• Internal 100 mΩ high-side switching MOSFET
• Adjustable switching frequency, f_SW: 250 to 500 kHz
• Synchronization to external clock: 1.2 × f_SW to 1.5 × f_SW
• Sleep mode supply current less then 3 μA
• Soft start time externally set via the SS pin
• Very low no-load current
• Pre-bias startup compatible
• Power OK (POK) output
• Pulse-by-pulse current limiting (OCP)
• Hiccup mode short-circuit protection (HIC)
• Overtemperature protection (TSD)
• Open-circuit and adjacent pin short-circuit tolerant
• Short-to-ground tolerant at every pin
• Externally adjustable compensation
• Stable with ceramic output capacitors
Package: 16-pin TSSOP (suffix LP)
Not to scale
Description
The A8584 is an adjustable frequency, high output current,
PWM regulator that integrates a low resistance, high-side,
N-channel MOSFET. The A8584 incorporates current-mode
control to provide simple compensation, excellent loop
stability, and fast transient response. The A8584 utilizes
external compensation to accommodate a wide range of power
components to optimize transient response without sacrificing
stability.
The A8584 regulates input voltages from 4.7 to 36 V, down
to output voltages as low as 0.8 V, and is able to supply
approximately 2.5Aof load current.TheA8584 features include
an externally adjustable switching frequency, an externally set
soft start time to minimize inrush currents, an EN/SYNC input
to either enable VOUT and/or synchronize the PWM switching
frequency, and a Power OK (POK) output to indicate when
VOUT is within regulation. The A8584 only turns on the
lower FET to charge the boot capacitor when needed, not at
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Applications:
• GPS/infotainment
• Automobile audio
• Home audio
• Network and telecom
V_IN
CIN
CSS
RFSET
CP
1
2
3
5
12
7
4
8
11
RZ
Typical Application
VIN
VIN
SW
SW
16
15
VIN _A8584
CBOOT
GND
GND
BOOT ¹⁴
LO
D1
EN/SY NC
SS
FSET
COMP
PAD
FB ⁹
RFB2
RFB1
CZ
POK ⁶
VOUT
CO1
RPU
POK
A8584-DS, Rev. 1
Figure 1. Typical application