AH375
Single Phase Hall Effect Latch
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.1.3 Jan. 09, 2006
1/6
Features
- 2.2V to 20V DC operation voltage
- Temperature compensation
- Wide operating voltage range
- Open drain pre-driver
- 25mA maximum sinking output current
- Package: SIP3, SOT23
Applications
- Brush-less DC Motor
- Brush-less DC Fan
- Revolution counting
- Speed measurement
General Description
AH375 is an integrated Hall effect latched sensor
designed for electronic commutation of brush-less
DC motor applications. The device includes an
on-chip Hall voltage generator for magnetic sensing,
a comparator that amplifies the Hall voltage, and a
schmitt trigger to provide switching hysteresis for
noise rejection, and open drain output. An internal
bandgap regulator is used to provide temperature
compensated supply voltage for internal circuits
and allows a wide operating supply range.
If a magnetic flux density larger than threshold Bop,
DO is turned on(low). The output state is held until
a magnetic flux density reversal falls below Brp
causing DO to be turned off (high).
Pin Assignments
375
1
2 : GND
3 : OUT
2
3
375
1
2
3
1 : Vdd
(Top view)
(SIP package)
(SOT23 package)
Pin Descriptions
Name
P/I/O
Pin #
Description
Vdd
P 1
Positive Power Supply
GND
P 2
Ground
OUT
O 3
Output Pin
Ordering Information
AH375 X - X X X
Packing
Blank : Bulk
A : Tape & Reel
P: SIP3
W: SOT23
Package
Lead
L : Lead Free
Wafer Body
Blank or
A~Z : if necessary
to specify
AH375
Single Phase Hall Effect Latch
Anachip Corp.
www.anachip.com.tw
Rev.1.3 Jan. 09, 2006
2/6
Typical Application Circuit
+12V
U1
AH375
Vdd
1
GND
2
OUTPUT
3
Q1
NPN
Q2
NPN
R1
2K
R2
3K
D1
+ C1
0.47uF
+ C2
0.47uF
L1
L2
Brush-less DC Fan
Functional Block Diagrams
Regulator
Hall
plate
Amp
2
GND
OUT
3
2
Vdd
1
AH375
Single Phase Hall Effect Latch
Anachip Corp.
www.anachip.com.tw
Rev.1.3 Jan. 09, 2006
3/6
Absolute Maximum Ratings
( at Ta=25
o
C )
Characteristics
Symbol
Values
Unit
Supply Voltage
Vdd
20
V
Magnetic Flux Density
B
Unlimited
Output OFF Voltage
V
DS
30 V
Output "On" Current
Continuous
Id
25
mA
Operating Temperature Range
Ta
-40~+125
C
Storage Temperature Range
Ts
-65~+150
C
Maximum Junction Temp.
Tj
150
C
SIP-3L 550
mW
Package Power Dissipation
SOT23-3L
Pd
230 mW
SIP-3L 227
Thermal Resistance
SOT23-3L
jc
543
C/W
Electrical Characteristics
(Ta=+ 25
C, Vdd =12V)
Characteristic
Symbol
Test Conditions
Min
Typ
Max
Units
Supply Voltage
Vdd
--
2.2
-
20
V
Output Saturation Voltage Vds(sat) Iout=20mA
-
300
700
mV
Output Leakage Current
Ioff
V
DD
=14V
-
<0.1
10
uA
Supply Current
Idd
Output Open
-
2
4
mA
Output Rise Time
tr
RL=820, CL=20Pf
-
0.1
1
us
Output Falling Time
tf
RL=820, CL=20pF
-
0.1
1
us
Test Circuit
CL
12V
OUT
RL=820 Ohm
CL=20 pF
RL
Test Circuit
Magnetic Characteristics
(Ta=25
C, Vdd =2.5V to 20V)
(1mT=10Gauss)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Operate Point
Bop
5
30
60
Gauss
Release Point
Brp
-60
-30
-5
Gauss
Hysteresis Bhys
-
60
-
Gauss
AH375
Single Phase Hall Effect Latch
Anachip Corp.
www.anachip.com.tw
Rev.1.3 Jan. 09, 2006
4/6
Marking side
S
( SIP3 )
N
Marking side
S
( SOT23 )
N
B
h
y
Vdd
(
O
u
tp
ut
V
o
l
t
a
ge
)
B
rp
B
op
0
( Magnetic flux density B )
Output
Turn off
Turn on
( off-state )
( on-state )
V
sat
V
sat
Performance Characteristics (SIP3)
Ta (
C)
25
50
60
70
80
85
90
95
100
Pd
(mW)
550 440 396 352 308 286 264 242 220
Ta (
C)
105
110
115
120
125
130
135
140
150
Pd
(mW)
198 176 154 132 110 88 66 44 0
P o w e r D is s ip a tio n C u rv e
0
1 0 0
2 0 0
3 0 0
4 0 0
5 0 0
6 0 0
0
2 5
5 0
7 5
1 0 0
1 2 5
1 5 0
T a ( C )
P d (m W )
Performance Characteristics (SOT23-3)
Ta (
C)
25
50
60
70
80
90
100
110
120
125
130 140 150
Pd (mW)
230 184 166 147
129
110
92
74
55
46
37 18 0
P o w e r D is s ip a tio n C u rv e
0
1 0 0
2 0 0
3 0 0
0
2 5
5 0
7 5
1 0 0
1 2 5
1 5 0
T a ( C )
P d (m W )
AH375
Single Phase Hall Effect Latch
Anachip Corp.
www.anachip.com.tw
Rev.1.3 Jan. 09, 2006
5/6
Marking Information
(1) SIP3
(2) SOT23
375
YWW X
Date code
Y : Year
WW : Nth week
(Top View)
ID Code:
A~Z: Non-Lead Free
a~z : Lead Free
P3:AH375
XX YM X
Date code
Y : Year
M : Month(A~L)
(Top View)
ID code
A~Z: Non-Lead Free
a~z: Lead Free
Package Information
(unit: mm)
(1) Package Type: SIP-3L
Active Area Depth
Sensor Location
1
2
3
2.00mm
1.15mm
0.51mm
NOM
BRANDED
SURFACE
Package Dimension
1.57mm
1.47mm
4.17mm
4.04mm
1.82
mm
15.50mm
13.00mm
1
2
3
1.27mm
0.41mm
0.41mm
45
45
0.38mm
0.7mm
3.10mm
2.97mm
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