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A8653 PDF Datasheet ( 特性, スペック, ピン接続図 )

部品番号 A8653
部品説明 Synchronous USB Buck Regulator
メーカ Allegro
ロゴ Allegro ロゴ 



Total 30 pages
		

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A8653 Datasheet, A8653 PDF,ピン配置, 機能
A8652, A8653
Wide Input Voltage, Synchronous USB Buck Regulator
with Remote Load Regulation
FEATURES AND BENEFITS
• Automotive AEC-Q100 qualified
• Cable and wiring drop compensation
• Dynamic voltage correction with controller
• Integrated high-side and low-side switching MOSFETs
• Programmable load-side current limit
• Maximized duty cycle for low dropout operation
• Operating input voltage range: 4 V to 36 V
• UVLO STOP threshold is at 2.6 VTYP
• Withstands surge voltages up to 40 V
• Continuous loading: 2.6 A for A8653; 1 A for A8652
• Adjustable switching frequency (fSW): 100 kHz to
2.2 MHz
• Synchronization to external clock: 100 kHz to 2.2 MHz
• Frequency dithering for lower EMI signature
• External adjustable compensation network
• Stable with ceramic output capacitors
Continued on next page...
PACKAGES:
16-Pin eTSSOP (suffix LP) with exposed thermal pad
Not to scale
DESCRIPTION
The A8652/53 is a high output current synchronous buck
regulator that provides tight load regulation over a wiring
harness without the need for remote sense lines.This remote load
regulation is achieved with an integrated open-loop correction
scheme that, given a known wiring harness resistance, adjusts
the output voltage based on the measured load current and a
user-programmable gain, achieving ±2% accuracy at 500 mV
of correction. The Remote Load Regulation control includes a
115% regulated voltage clamp in conjunction with a dynamic
overvoltage protection, with OVP threshold changing with the
correction voltage. TheA8652/53 includes a user-configurable
load-side current limit to fold back the output voltage during an
output overcurrent condition. TheA8652/53 regulates nominal
input voltages from 4 to 36 V and remains operational when
VIN drops as low as 2.6 V. When the input voltage approaches
the output voltage, the duty cycle is maximized to maintain
the output voltage.
The A8652/53 features include externally set soft-start time,
external compensation network, an EN input to enable VOUT,
a SYNC/FSET input to synchronize or set the PWM switching
APPLICATIONS
• Automotive USB Power Ports
• Rear Seat Entertainment
• Navigation Systems
• Motorcycle Clusters
Continued on next page...
VIN
CIN
VIN
2 × 4.7 µF
GND
EN
RFSET
SYNC/FSET
CSS
22 nF
SS
RZ
CP
CZ
COMP
FB
A8652/3
BOOT
SW
GADJ
CBOOT
100 nF
RGADJ
LO
CO
RSEN
VOUT
ISEN+
ISEN-
IADJ
CF
(optional)
RF
(optional)
RIADJ
POK
RPU
10 kΩ
RFB1
24.9 kΩ
RFB2
4.75 kΩ
RWIRE/2
RWIRE/2
VLOAD
CLOAD
A8652/53-DS, Rev.2
Typical Application Diagram 1

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