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ATC
Complementary Output Hall Effect Latch ATS276/277
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 DO、DOB 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
Part No.
6 : ATS276
7 : ATS277 277:A or B
Wafer Body
Blank or
A~Z : if necessary
to specify
Package
P: SIP-4L
Lead
L : Lead Free
Blank: Normal
Packing
Blank : Tube or Bulk
A : Tape & Reel
Magnetic
Characteristics
276:A or B or C
Typical Application Circuit
27X
12 43
Vcc
Brush-less DC Fan
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.
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coil1
coil2
Rev.B1 Mar 17, 2004
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ATC
Complementary Output Hall Effect Latch ATS276/277
Block Diagram
1
VCC
REG.
Hall Plate
Amp
DO
2
DOB
3
GND
4
Pin Assignment
Name P/I/O Pin # Description
Vcc P 1 Power Supply Input
DO O 2 Output Pin
DOB O 3 Output Pin
GND P 4 Ground
277
(276)
12 43
Front View
1 : VCC
2 : DO
3 : DOB
4 :GND
Anachip Corp.
www.anachip.com.tw
Rev.B1 Mar 17, 2004
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Page 3
ATC
Complementary Output Hall Effect Latch ATS276/277
Absolute Maximum Ratings ( at Ta=25°C )
Characteristics Symbol Values Unit
Supply voltage VCC 20 V
Reverse VCC Polarity Voltage V
Magnetic flux density B Unlimited
Continuous 0.4
Output “on” current
Operating temperature range
Storage temperature range
Package Power Dissipation PD 550 mW
Maximum Junction Temp Tj 150
Hold 0.5
Peak (Start Up)
Electrical Characteristics ( T=+25°C Vcc = 4.0V to 20V )
Characteristic Symbol Conditions Min Typ Max Units
-20 V
RCC
Ic
Ta
Ts
0.7
-20~+85
-65~+150
A
°C
°C
°C
Low Supply Voltage Vce Vcc=3.5V, IL=100mA 0.4 V
Supply Voltage Vcc 3.5 20 V
Output Zener Breakdown Vz 46 V
Output Saturation Voltage Vce(sat) Vcc=14V, IL=300mA 0.3 0.6 V
Output Leakage Current Icex Vce=14V, Vcc=14V
Supply Current Icc Vcc=20V, Output Open 16 25 mA
Output Rise Time tr
Output Falling Time tf
Switch Time Differential
Vcc=14V, R
Vcc=14V, R
∆t Vcc=14V, R
=820Ω, CL=20pF
L
=820Ω, CL=20pF
L
=820Ω, CL=20pF
L
<0.1
3.0 10 µs
0.3 1.5 µs
3.0 10 µs
10 µA
Test Circuit
14V
RL1
RL2
RL1=RL2=820 Ohm
CL1=CL2=20 pF
277
(276)
CL1 CL2
DO
DOB
Anachip Corp.
www.anachip.com.tw
Rev.B1 Mar 17, 2004
3/7
Page 4
ATC
Complementary Output Hall Effect Latch ATS276/277
Magnetic Characteristics( Ta=+25°C)
(1mT=10 Gauss)
A grade
Characteristic Symbol Min. Typ. Max. Unit
Operate Point
Release Point
Hysteresis
B grade
Characteristic Symbol Min. Typ. Max. Unit
Operate Point
Release Point
Hysteresis
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
DO
ATS276 10 - 50
ATS277
ATS276 -50 - -10
ATS277
ATS276 - 75 ATS277
ATS276 5 - 70
ATS277
ATS276 -70 - -5
ATS277
ATS276 - 75 ATS277
Bop
Brp
Bhy
Bop
Brp
Bhy
10 - 50
-50 - -10
- 75 -
5 - 70
-70 - -5
- 75 -
Gauss
Gauss
Gauss
Gauss
Gauss
Gauss
DOB
( off-state )
V
cc
Turn off
( Output Voltage )
( Magnetic flux density B )
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www.anachip.com.tw
( off-state )
B
hy
Turn on
Turn on
B
hy
V
cc
Turn oFF
( Output Voltage )
( on-state )
V
sat
B
rp
Rev.B1 Mar 17, 2004
B
op
0
4/7
( on-state )
V
sat
B
rp
B
op
0
( Magnetic flux density B )
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ATC
Complementary Output Hall Effect Latch ATS276/277
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
Pd (mW)
1000
800
600
400
200
0
0 25 50 75 100 125 150
Typical Magnetic Switch Point VS. Supply Voltage
Power Dissipation Curve
85
Ta (。C)
120
80
40
0
Flux Density (G)
-40
5122024
Typical Supply Current versus Supply Voltage
16
14
12
10
8
6
4
2
Supply Current (mA)
0
0 5 10 15 20 25
Supply Voltage (V)
TA=80oC
TA=-20oC
TA=25oC
Bhys
Bop
Brp
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Supply Voltage (V)
Rev.B1 Mar 17, 2004
5/7
Page 6
ATC
Complementary Output Hall Effect Latch ATS276/277
Operating Characteristics
DO
V
cc
S
High
Marking side
V
d
B
hy
N
( SIP4 )
Marking Information
Part Number
( Output Voltage )
V
sat
B
rp
N
0
( Magnetic flux density )
( Top View )
27X
X XX X X
Blank : normal
L : Lead Free Package
ID Code: A ~ Z
Nth week: 01~52
Year:
Low
B
op
"1" = 2001
"2" = 2002
~
S
Anachip Corp.
www.anachip.com.tw
Rev.B1 Mar 17, 2004
6/7
Page 7
ATC
Complementary Output Hall Effect Latch ATS276/277
Package Information
Active Area Depth Package Sensor Location
Package Dimension
0.30mm
+/-0.1mm
Marking side
0.7mm
1.55mm
+/-0.1mm
1.03mm
+/-0.1
o
o
5
-7
o
3o -5
3.65mm
+/-0.1mm
0.46mm
1.35mm
+/-1.25mm
+/-0.03mm
1.75mm
1234
14.25mm
0.38mm
+/-0.03mm
0.38mm
+/-0.03mm
o
o
-7
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5.22mm
4.20mm
+/-0.1mm
+/-0.1mm
o3o
-55
Rev.B1 Mar 17, 2004
27X
1.42mm+/-0.1mm
7/7
0.2mm Max.
+/-0.03mm
1.27mm
3.81mm
+/-0.03mm
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