A8583 Datasheet, PDF (1/33 Pages) Allegro MicroSystems – The A8583 is an adjustable frequency, high output current, PWM regulator that integrates a low resistance, high-side, N-channel MOSFET.

A8583
Wide Input Voltage, 2.4 MHz , 3.5 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
• Capable of at least 3.5 A steady-state output current
• Adjustable output voltage as low as 0.8 V
• Internal 70 mΩ high-side switching MOSFET
• Adjustable switching frequency, f_SW: 0.25 to 2.4 MHz
• 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, typically 3.5 mA
• Pre-bias startup compatible
• Power OK (POK) output
• Pulse-by-pulse current limiting (OCP)
• Hiccup mode short-circuit protection (HIC)
• Overtemperature protection (TSD)
• Overvoltage protection (OVP)
• Missing asynchronous diode (D1) protection
• 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 A8583 is an adjustable frequency, high output current,
PWM regulator that integrates a low resistance, high-side,
N-channel MOSFET. The A8583 incorporates current-mode
control to provide simple compensation, excellent loop
stability, and fast transient response. The A8583 utilizes
external compensation to accommodate a wide range of power
components to optimize transient response without sacrificing
stability.
The A8583 regulates input voltages from 4.7 to 36 V, down to
output voltages as low as 0.8 V, and is able to supply at least
3.5 A of load current. The A8583 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 A8583 only turns-on the lower
FET to charge the boot capacitor when needed, not every PWM
Continued on the next page…
Applications:
• GPS/infotainment
• Automobile audio
• Home audio
• Network and telecom
V_IN
CIN1
3.3 μF
50 V
CIN2
50 V
Empty
CSS
22 nF
RFSET
11.5 kΩ
CP
4.7 pF
1
2
3
5
12
7
4
8
11
RZ
18.2 kΩ
CZ
1.2 nF
Typical Application
VIN
VIN
SW
SW
16
15
VIN _A8583
GND
GND
BOOT ¹⁴
EN/SY NC
10
FBX
SS
CBOOT
100 nF
CFBX
120 pF
L_O
1.5 μH
D1
4 A /40 V
SMB
RS1
16.5 kΩ
CO1
10 μF
16 V
RS2
5.23 kΩ
FSET
COMP
PAD
FB ⁹
RFB2
5.23 kΩ
POK ⁶
RFB1
16.5 kΩ
3.3V
RPU
2 kΩ
POK
VOUT
CO2
10 μF
16 V
A8583-DS, Rev. 14
Figure 1. Application schematic, at V_IN 5 to 16 V, 3.3 V_OUT , at 2 MHz