ATC
Complementary Output Hall Effect Latch
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
ATS276/277
General Description
Applications
-
-
-
-
Dual-coil Brush-less DC Motor
Dual-coil Brush-less DC Fan
Revolution Counting
Speed Measurement
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
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
277:A or B
Typical Application Circuit
27X
coil1
coil2
1
Vcc
2
3
4
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.
Rev.B1 Mar 17, 2004
1/7
ATC
Complementary Output Hall Effect Latch
Absolute Maximum Ratings
( at Ta=25°C )
Characteristics
Supply voltage
Reverse V
CC
Polarity Voltage
Magnetic flux density
Continuous
Output “on” current
Hold
Peak (Start Up)
Operating temperature range
Storage temperature range
Package Power Dissipation
Maximum Junction Temp
Symbol
V
CC
V
RCC
B
Ic
Values
20
-20
Unlimited
0.4
0.5
0.7
-20~+85
-65~+150
550
150
A
°C
°C
mW
°C
Unit
V
V
ATS276/277
T
a
T
s
PD
Tj
Electrical Characteristics
( T=+25°C Vcc = 4.0V to 20V )
Characteristic
Low Supply Voltage
Supply Voltage
Output Zener Breakdown
Output Saturation Voltage
Output Leakage Current
Supply Current
Output Rise Time
Output Falling Time
Switch Time Differential
Symbol
Vce
Vcc
Vz
Vce(sat)
Icex
Icc
tr
tf
∆t
Conditions
Vcc=3.5V, I
L
=100mA
3.5
Vcc=14V, I
L
=300mA
Vce=14V, Vcc=14V
Vcc=20V, Output Open
Vcc=14V, R
L
=820Ω, C
L
=20pF
Vcc=14V, R
L
=820Ω, C
L
=20pF
Vcc=14V, R
L
=820Ω, C
L
=20pF
46
0.3
<0.1
16
3.0
0.3
3.0
Min
Typ
0.4
20
0.6
10
25
10
1.5
10
Max
Units
V
V
V
V
µA
mA
µs
µs
µs
Test Circuit
14V
277
(276)
RL1
DO
DOB
RL2
RL1=RL2=820 Ohm
CL1=CL2=20 pF
CL1 CL2
Anachip Corp.
www.anachip.com.tw
3/7
Rev.B1 Mar 17, 2004
ATC
Complementary Output Hall Effect Latch
Performance Characteristics (SIP4)
Ta (°C)
25
50
60
70
80
85
90
95
100
220
105
198
110
176
115
154
120
132
Pd (mW) 550 440 396 352 308 286 264 242
Pd (mW)
1000
800
600
400
200
0
0
25
50
75
85
100
125
ATS276/277
Power Dissipation Curve
Ta (。C)
150
Typical Magnetic Switch Point VS. Supply Voltage
120
Flux Density (G)
Bhys
80
Bop
40
0
-40
5
12
20
Brp
24
Supply Voltage (V)
Typical Supply Current versus Supply Voltage
16
14
12
10
8
6
4
2
0
0
5
Supply Current (mA)
TA=80
o
C
TA=25
o
C
TA=-20
o
C
10
15
20
25
Supply Voltage (V)
Anachip Corp.
www.anachip.com.tw
5/7
Rev.B1 Mar 17, 2004
Power technology
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