Monitor. ACS761ELF-20B Datasheet

ACS761ELF-20B Datasheet PDF

Part ACS761ELF-20B
Description 12V High-Side Hot-Swap Hall Effect Based Current Monitor
Feature ACS761ELF-20B www.DataSheet4U.com 12 V High-Side Hot-Swap Hall Effect Based Current Monitor Feature.
Manufacture Allegro Micro Systems
Datasheet
Download ACS761ELF-20B Datasheet

ACS761ELF-20B www.DataSheet4U.com 12 V High-Side Hot-Swap H ACS761ELF-20B Datasheet





ACS761ELF-20B
www.DataSheet4U.com
ACS761ELF-20B
12 V High-Side Hot-Swap Hall Effect Based Current Monitor
Features and Benefits
Hall-effect current monitor—no external sense resistor required
PGOOD and ¯P¯¯G¯¯¯O¯¯O¯¯¯D¯ indication
Analog output voltage (factory trimmed for gain and offset)
proportional to applied current
External high-side FET gate drive
240V*A power fault protection with user-selectable delay
Overcurrent fault protection with user-selectable delay
Fault protection isolates failed supply from output in < 2 μs
1.5 mΩ internal conductor resistance
Active low latched Fault indicator output signal
User controlled soft start / hot-swap function
Logic enable input pin
10.8 to 13.2 V, single-supply operation
2 kV ESD protection for all pins
Package: 24 pin QSOP (suffix LF)
Description
The ACS761 combines Allegro® Hall-effect current sense
technology with a hot-swap controller resulting in a more
efficient integrated controller for 12 V applications. By
eliminating the need for a shunt resistor, the I2R losses in the
power path are reduced.
When the ACS761 is externally enabled, and the voltage rail is
above the internal UVLO threshold, the internal charge pump
drives the gate of the external FET. When the load voltage
reaches its target value PGOOD is asserted high. When a fault
is detected, the gate is disabled while simultaneously alerting
the application that a fault has occurred.
The integrated protection in the ACS761 incorporates three
levels of fault protection, which includes a Power Fault with
user-selectable delay, an Overcurrent Fault threshold with user-
selectable delay, and Short Circuit protection, which disables
the gate in less than 2 μs. These faults are indicated to the
host system via the Fault pin and are cleared upon reasserting
enable high.
Approximate Scale
Typical Application
Enable
1
2
IP 3
4
CIN RV1
5
6
REN
7
CEN
8
VOUT 9
10
CG
COCD
COPD
11
12
24
IP+ IP–
23
IP+ IP–
22
IP+ IP–
21
IP+
ACS761
IP–
20
IP+ IP–
19
IP+ IP–
18
EN GATE
17
VIOUT
GND
16
NC PGOOD
15
CG FB+
14
OCDLY
PGOOD
13
OPDLY
FAULT
S1 VLOAD
CLOAD
RG
RFB
3.3 V
100
kΩ
RS1
100 kΩ
RFAULT
100 kΩ
761ELF20B-DS, Rev. 2



ACS761ELF-20B
wwAw.CDaStaS7he6e1t4UE.cLomF-20B 12 V High-Side Hot-Swap Hall Effect Based Current Monitor
Selection Guide
Part Number
Package
ACS761ELFTR-20B-T
QSOP24 surface mount
*Contact Allegro for additional packing options
Packing*
2500 pieces/reel
Absolute Maximum Ratings
Characteristic
Forward Voltage, IPx pins*
GATE Drive Output Voltage*
FB+ Forward Voltage*
EN Forward Voltage*
All Other Pins Forward Voltage
Reverse DC Voltage, All Pins*
Reverse Transient DC Voltage, All Pins*
Current Sense Output Current Source
Current Sense Output Current Sink
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
* With respect to GND.
Symbol
VCC
VGATE
VFB+
VEN
VIN
VR
Vr
IVIOUT(Source)
IVIOUT(Sink)
TA
TJ(max)
Tstg
VIOUT to GND
VCC to VIOUT
Range E
Notes
Rating
24
32
24
32
8
–0.5
–5
1
1
–40 to 85
165
–65 to 165
Units
V
V
V
V
V
V
V
mA
mA
ºC
ºC
ºC
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2




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