Complementary Output Hall Effect Latch
ATS276/277
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev.B1 Mar 17, 2004
1/7
ATC
Features
- On-chip Hall sensor with two different sensitivity
and hysteresis settings for ATS276/277
- 3.5V to 20V operating voltage
- 400mA (avg) output sink current
- Build-in protecting diode only for chip reverse
power connecting
- -20
°C to 85°C operating temperature
- Low profile 4 pin SIP package
Applications
- Dual-coil Brush-less DC Motor
- Dual-coil Brush-less DC Fan
- Revolution Counting
- Speed Measurement
General Description
ATS276/277 are integrated Hall sensors with output
drivers, mainly designed for electronic commutation
of brush-less DC Fan. This IC internally includes
the regulator, protecting diode, Hall plate, amplifier,
comparator, and a pair of complementary
open-collector outputs (DO, DOB).
While the magnetic flux density (B) is larger than
operate point (Bop), DO will turn on (low), and
meanwhile DOB will turn off (high). Each output is
latched until B is lower than release point (Brp),
and then DODOB transfer each state.
For DC fan application, sometimes need to test
power reverse connection condition. Internal diode
only protects chip-side but not for coil-side. If
necessary, add one external diode to block the
reverse current from coil-side.
Ordering Information
ATS27X X - X X X - X
Packing
Blank : Tube or Bulk
A : Tape & Reel
P: SIP-4L
Package
Lead
L : Lead Free
Blank: Normal
Wafer Body
Magnetic
Characteristics
Blank or
A~Z : if necessary
to specify
276:A or B or C
Part No.
6 : ATS276
7 : ATS277
277:A or B
Typical Application Circuit
1 2
4
3
27X
coil1
coil2
Vcc
Brush-less DC Fan
Complementary Output Hall Effect Latch
ATS276/277
Anachip Corp.
www.anachip.com.tw
Rev.B1 Mar 17, 2004
3/7
ATC
Absolute Maximum Ratings
( at Ta=25
°C )
Characteristics
Symbol
Values
Unit
Supply voltage
V
CC
20 V
Reverse V
CC
Polarity Voltage
V
RCC
-20 V
Magnetic flux density
B
Unlimited
Continuous 0.4
Hold 0.5
Output "on" current
Peak (Start Up)
Ic
0.7
A
Operating temperature range
T
a
-20~+85
°C
Storage temperature range
T
s
-65~+150
°C
Package Power Dissipation
PD
550 mW
Maximum Junction Temp
Tj
150
°C
Electrical Characteristics
( T=+25
°C Vcc = 4.0V to 20V )
Characteristic
Symbol
Conditions
Min
Typ
Max
Units
Low Supply Voltage
Vce
Vcc=3.5V, I
L
=100mA
0.4
V
Supply Voltage
Vcc
3.5
20
V
Output Zener Breakdown
Vz
46
V
Output Saturation Voltage
Vce(sat) Vcc=14V, I
L
=300mA
0.3
0.6
V
Output Leakage Current
Icex
Vce=14V, Vcc=14V
<0.1
10
µA
Supply Current
Icc
Vcc=20V, Output Open
16
25
mA
Output Rise Time
tr
Vcc=14V, R
L
=820
, C
L
=20pF
3.0
10
µs
Output Falling Time
tf
Vcc=14V, R
L
=820
, C
L
=20pF
0.3
1.5
µs
Switch Time Differential
t Vcc=14V,
R
L
=820
, C
L
=20pF
3.0
10
µs
Test Circuit
277
(276)
CL1 CL2
14V
DO
DOB
RL1=RL2=820 Ohm
CL1=CL2=20 pF
RL2
RL1
Complementary Output Hall Effect Latch
ATS276/277
Anachip Corp.
www.anachip.com.tw
Rev.B1 Mar 17, 2004
4/7
ATC
Magnetic Characteristics
( Ta=+25
°C)
(1mT=10 Gauss)
A grade
Characteristic
Symbol
Min.
Typ.
Max.
Unit
ATS276 10
-
50
Operate Point
ATS277
Bop
10 - 50
Gauss
ATS276 -50
-
-10
Release Point
ATS277
Brp
-50 - -10
Gauss
ATS276 -
75
-
Hysteresis
ATS277
Bhy
- 75 -
Gauss
B grade
Characteristic
Symbol
Min.
Typ.
Max.
Unit
ATS276 5
-
70
Operate Point
ATS277
Bop
5 - 70
Gauss
ATS276 -70
-
-5
Release Point
ATS277
Brp
-70 - -5
Gauss
ATS276 -
75
-
Hysteresis
ATS277
Bhy
- 75 -
Gauss
C grade
Characteristic
Symbol
Min.
Typ.
Max.
Unit
Operate Point
ATS276
Bop
-
-
100
Gauss
Release Point
ATS276
Brp
-100
-
-
Gauss
Hysteresis ATS276
Bhy
-
75
-
Gauss
B
hy
V
sat
V
cc
( Output Voltage )
B
rp
B
op
0
( Magnetic flux density B )
DO
Turn on
Turn off
( off-state )
( on-state )
B
hy
V
sat
V
cc
( Output Voltage )
B
rp
B
op
0
( Magnetic flux density B )
DOB
Turn oFF
Turn on
( off-state )
( on-state )
Complementary Output Hall Effect Latch
ATS276/277
Anachip Corp.
www.anachip.com.tw
Rev.B1 Mar 17, 2004
5/7
ATC
Performance Characteristics (SIP4)
Ta (
°C)
25
50
60
70
80
85
90
95
100
105
110
115
120
Pd
(mW) 550 440 396 352 308 286 264 242
220
198
176 154 132
Power Dissipation Curve
0
200
400
600
800
1000
0
25
50
75
100
125
150
Ta (C)
Pd (mW)
85
Typical Magnetic Switch Point VS. Supply Voltage
-40
0
40
80
120
5
12
20
24
Supply Voltage (V)
Flux Density (G)
Bhys
Bop
Brp
Typical Supply Current versus Supply Voltage
0
2
4
6
8
10
12
14
16
0
5
10
15
20
25
Supply Voltage (V)
Supply Current (mA)
TA=25
o
C
TA=80
o
C
TA=-20
o
C
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