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A8651 Datasheet Preview

A8651 Datasheet

Low Input Voltage Adjustable Frequency Dual Synchronous 2 A / 2 A Buck Regulator

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A8651
Low Input Voltage, Adjustable Frequency Dual Synchronous
2A / 2A Buck Regulator with Synchronization, 2x EN, and 2x NPOR
Features and Benefits
• AEC-Q100 Qualified
• Operating voltage range: 2.5 to 5.5 V
• UVLO stop threshold: 2.25 V (max)
• Dual outputs with up to 2 A output current per regulator
• Adjustable output voltage as low as 0.8 V
• Internal 80 mΩ high-side switching MOSFET
• Internal 55 mΩ low-side switching MOSFET
• Adjustable switching frequency ( fSW): 0.35 to 2.2 MHz
• Synchronizes to external clock: 1.2 × to 1.5 × fOSC
• 180° phase shift between switching regulators
• Sleep mode supply current less than 5 μA
• Soft start time externally set via the SS pin
• Pre-biased startup capable
• Externally adjustable compensation
• Stable with ceramic output capacitors
• Independent enable inputs and NPOR output pins
• Adjustable current limiting (OCP) for each regulator
• Hiccup mode short-circuit protection (HIC)
• Overvoltage and overtemperature protection
• Open-circuit and adjacent pin short-circuit tolerant
• Short-to-ground tolerant at every pin
Package: 20-pin TSSOP with exposed
thermal pad (suffix LP)
Not to scale
Description
The A8651 is an adjustable frequency, high output current,
PWM regulator that integrates a high-side, P-channel MOSFET
and a low-side, N-channel MOSFET. The A8651 incorporates
current-mode control to provide simple compensation, excellent
loop stability, and fast transient response. The A8651 utilizes
external compensation to accommodate a wide range of power
components to optimize transient response without sacrificing
stability. The A8651 regulates input voltages from 2.5 to 5.5 V,
down to output voltages as low as 0.8 V and is able to supply
up to 2 A of load current per regulator.
The A8651 features include an externally adjustable and
synchronizable switching frequency, an externally-set soft
start time to minimize inrush currents, independent EN inputs,
and independent NPOR outputs with 7.5 ms delay. The sleep
mode current of the A8651 control circuitry is less than 5 μA.
Protection features includeVIN undervoltage lockout (UVLO),
cycle-by-cycle overcurrent protection (OCP), hiccup mode
short-circuit protection (HIC), overvoltage protection (OVP),
and thermal shutdown (TSD). In addition, the A8651 provides
open-circuit, adjacent pin short-circuit, and short-to-ground
Continued on the next page…
Applications:
• GPS/Infotainment
• Automotive audio
• Home audio
• Network and telecom
SYNCin
CSYNC DSYNC
VIN
EN1
CP1
RZ1
CZ1
EN2
CP2
RZ2
CZ2
Typical Application Diagram
5 FSET/SYNC
RFSET
SW1 1
CIN1
20 VIN1
16 GND
2 PGND1
CSS1
3 EN1
17 COMP1
19
4
SS1
ISET1
RSET1
11 VIN2
A8651
FB1 18
NPOR1 15
SW2 10
CIN2
9 PGND2
FB2 14
CSS2
8 EN2
13
12
7
COMP2
SS2
ISET2
NPOR2 6
RSET2
LO1
RFB1
RFB2
LO2
RFB3
RFB4
VOUT1
CO1
RPU1
NPOR1
VOUT2
CO2
RPU2
NPOR2
A8651-DS
Free Datasheet http://www.Datasheet4U.com




Allegro

A8651 Datasheet Preview

A8651 Datasheet

Low Input Voltage Adjustable Frequency Dual Synchronous 2 A / 2 A Buck Regulator

No Preview Available !

A8651
Low Input Voltage, Adjustable Frequency Dual Synchronous
2A / 2A Buck Regulator with Synchronization, 2x EN, and 2x NPOR
Description (continued)
protection at every pin to satisfy the most demanding automotive
applications.
The A8651 device is available in a 20-pin TSSOP package with
exposed thermal pad for enhanced thermal dissipation (suffix LP).
It is lead (Pb) free, with 100% matte tin leadframe plating.
Selection Guide
Part Number
Operating Ambient
Temperature Range
TA, (°C)
A8651KLPTR-T
–40 to 125
*Contact Allegro™ for additional packing options.
Package
20-pin TSSOP with
exposed
thermal pad
Packing*
4000 pieces per
13-in. reel
Leadframe Plating
100% matte tin
Absolute Maximum Ratings1
Characteristic
Symbol
Notes
Rating
Unit
VIN1 and VIN2 to GND
SW1 and SW2 to GND2
All Other Pins
VIN
VSW
Continuous
t < 50 ns
–0.3 to 6.0
–0.3 to VIN + 0.3
–1.0 to VIN +2.0
–0.3 to 6.0
V
V
V
V
Operating Ambient Temperature
TA K temperature range
–40 to 125
ºC
Maximum Junction Temperature
TJ(max)
150 ºC
Storage Temperature
Tstg
–55 to 150
ºC
1Operation at levels beyond the ratings listed in this table may cause permanent damage to the device. The Absolute Maximum ratings
are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the Electrical
Characteristics table is not implied. Exposure to Absolute Maximum-rated conditions for extended periods may affect device reliability.
2SW1 and SW2 have internal clamp diodes to GND and VIN. Applications that forward bias these diodes should take care not to exceed
the A8651 package power dissipation limits.
Thermal Characteristics may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions*
Package Thermal Resistance
RθJA On 4-layer PCB based on JEDEC standard
*Additional thermal information available on the Allegro website.
Value Unit
32 ºC/W
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
Free Datasheet http://www.Datasheet4U.com


Part Number A8651
Description Low Input Voltage Adjustable Frequency Dual Synchronous 2 A / 2 A Buck Regulator
Maker Allegro
Total Page 30 Pages
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