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IC manufacturers Allegro Microsystems

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reference designA81850 | Demoboard APEK81850

Allegro Microsystems A81850 | Demoboard APEK81850

Overview

TopologyBoost Converter
Input voltage5-37 V
Output 165 V
IC revision1

Description

The A81850 is a synchronous boost/buck/buck-boost controller with programmable outputs and a SPI communication interface capable of 80 W per channel. The device integrates two half-bridge drivers able to create a dual-channel synchronous boost or buck converter or a single-channel synchronous buck-boost converter.

Features

  • Two-channel synchronous boost or buck controllers orsingle-channel buck-boost controller
  • Wide VIN range: 5 to 37 V operating, 40 V transient
  • Output voltage ranges:□ Boost mode: 16 to 65 V, with 2% accuracy□ Buck mode: 3.3 to 6 V, with 1.5% accuracy□ Buck-boost mode: 5 to 22 V, with 2% accuracy
  • Programmable output voltage□ 8-bit resolution in boost and buck-boost mode□ 3.3 V, 4.5 V, 5 V, 5.5 V, and 6 V in buck mode
  • Fixed-frequency operation, 200 to 450 kHz
  • Array mode supports in-parallel operation of up to twounits (four phases): Units can be synchronized

Typical applications

  • Electronic Power Steering, Information Systems and Entertainment

More information

Parts approved by Allegro Microsystems

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
L(µH)
IRP,40K(A)
ISAT,30%(A)
RDC typ.(mΩ)
RDC max.(mΩ)
fres(MHz)
Mount
C
VR(V (DC))
Endurance(h)
IRIPPLE(mA)
Z(mΩ)
ILeak(µA)
DF(%)
Ø D(mm)
L(mm)
Packaging
SamplesAvailability & Sample
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74439370150
SPECWE-XHMI SMT Power Inductor, 15 µH, 14.7 A
Simu­lation
Availability
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Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-XHMI SMT Power Inductor
Inductance15 µH
Performance Rated Current14.7 A
Saturation Current @ 30%26.1 A
DC Resistance10.5 mΩ
DC Resistance11.55 mΩ
Self Resonant Frequency8 MHz
MountSMT 
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–
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Length16.4 mm
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–Check availability
865080653016
SPECWCAP-ASLI Aluminum Electrolytic Capacitors, –, –
Simu­lation
Availability
–
Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWCAP-ASLI Aluminum Electrolytic Capacitors
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MountV-Chip SMT 
Capacitance100 µF
Rated Voltage50 V (DC)
Endurance 2000
Ripple Current350 mA
Impedance460 mΩ
Leakage Current50 µA
Dissipation Factor12 %
Diameter8 mm
Length10.5 mm
Packaging15" Tape & Reel 
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Additional parts recommended by Würth Elektronik

Recommended parts are Würth Elektronik alternatives that are not formally approved for this reference design. Please verify it is suitable for your application, and contact us if you have any questions.

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Order Code
Data­sheet
Downloads
Status
Product series
L(µH)
Tol. L
IRP,40K(A)
IR,40K(A)
ISAT,30%(A)
fres(MHz)
ISAT,10%(A)
Mount
RDC typ.(mΩ)
Material
SamplesAvailability & Sample
Log in now to view availability and request availability forecasts. LOGIN
78439370150
SPECWE-XHMA SMD Power Inductor, 15 µH, ±20%

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

Availability
–
Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-XHMA SMD Power Inductor
Inductance15 µH
Inductance±20% 
Performance Rated Current14.7 A
Rated Current10 A
Saturation Current @ 30%26.1 A
Self Resonant Frequency8 MHz
Saturation Current @ 10%10.25 A
MountSMT 
DC Resistance10.5 mΩ
MaterialHyperflux 
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