Allegro Microsystems

A8653

Wide Input Voltage, Synchronous USB Buck Regulator with Remote Load Regulation

Topologie: Buck
Eingangsspannung (min.): 4.00 V
Eingangsspannung (max.): 36.00 V
Schaltfrequenz (min.): 100.00 kHz
Schaltfrequenz (max.): 2200.00 kHz

Beschreibung

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 over voltage 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 over current condition. The A8652/53 regulates nominal input voltages from 4.0 V 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’s 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 frequency, and a PowerOK output to indicate when VOUT is within regulation and there is no load side current limit condition. Protection features include VIN under-voltage-lockout, cycle-by-cycle current limit, hiccup mode short-circuit protection, dynamic over-voltage protection, and thermal shutdown. A8652/53 provides open-circuited, adjacent pin short-circuit, and short-to-ground protection at every pin to satisfy the most demanding automotive and non-automotive applications.The A8652/53 device is available in a 16-pin eTSSOP package with exposed pads for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte tin lead frame plating. The maximum junction temperature (TJ(max)) is 150°C.

Merkmale

  • 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: 4.0 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; 1.0 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
  • Pre-bias startup compatible
  • Power OK (POK) output
  • Dynamic over voltage protection, cycle-by-cycle current limit, hiccup mode short circuit, and thermal protections
  • Open-circuit and adjacent pin short-circuit tolerant
  • Short-to-ground tolerant at every pin
  • USB3 Charging capability: A8653 – 2.6 A
  • USB2 capability: A8652 – 1 ARemarks:Table 3: Recommended Components ValuesRefer apge no.30

Artikel

  Artikel Nr. SPEC Produktserie L1
(µH)
IR 1
(A)
ISAT 1
(A)
RDC1 typ
(mΩ)
RDC1 max.
(mΩ)
fres 1
(MHz)
Muster
74437368330 PDF WE-LHMI SMT Speicherdrossel 33 2.6 5 92 112 6

Weitere Anwendungen und Artikel von Würth Elektronik zu diesem IC

  • A8653
    Topologie: Buck, Eingangsspannung (min.): 4.00 V, Eingangsspannung (max.): 36.00 V, Schaltfrequenz (min.): 100.00 kHz, Schaltfrequenz (max.): 2200.00 kHz, Ausgang 1: 0.80 V / 2.750 A
  • A8653
    Topologie: Buck, Eingangsspannung (min.): 4.00 V, Eingangsspannung (max.): 36.00 V, Schaltfrequenz (min.): 100.00 kHz, Schaltfrequenz (max.): 2200.00 kHz, Ausgang 1: 0.80 V / 2.750 A
  • A8653
    Topologie: Buck, Eingangsspannung (min.): 4.00 V, Eingangsspannung (max.): 36.00 V, Schaltfrequenz (min.): 100.00 kHz, Schaltfrequenz (max.): 2200.00 kHz, Ausgang 1: 0.80 V / 2.750 A