A8652 Datasheet, PDF (1/37 Pages) Allegro MicroSystems – Wide Input Voltage, Synchronous USB Buck Regulator with Remote Load Regulation

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 V_TYP
• Withstands surge voltages up to 40 V
• Continuous loading: 2.6 A for A8653; 1 A for A8652
• Adjustable switching frequency (f_SW): 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
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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. The A8652/53 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
V_IN 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 V_OUT,
a SYNC/FSET input to synchronize or set the PWM switching
APPLICATIONS
• Automotive USB Power Ports
• Rear Seat Entertainment
• Navigation Systems
• Motorcycle Clusters
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V_IN
C_IN
VIN
2 × 4.7 µF
GND
EN
R_FSET
SYNC/FSET
SS
C_SS
22 nF
R_Z
C_P
C_Z
COMP
FB
A8652/3
BOOT
SW
GADJ
C_BOOT
100 nF
R_GADJ
L_O
C_O
R_SEN
V_OUT
ISEN+
ISEN-
IADJ
C_F
R_F
(optional) _(optional)
R_IADJ
POK
R_PU
10 kΩ
R_FB1
24.9 kΩ
R_FB2
4.75 kΩ
R_WIRE/2
R_WIRE/2
V_LOAD
C_LOAD
A8652/53-DS, Rev.2
Typical Application Diagram 1