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Ordering number : ENN5805
LB1817W
Monolithic Digital IC
LB1817W
FDD Spindle Motor Driver
Overview
The LB1817W is a spindle motor driver for low-profile
floppy disk drives.
Functions and Features
• Three-phase full-wave linear drive
(with external PNP transistor)
• Low saturation voltage
• Built-in digital speed control
Package Dimensions
unit: mm
3163A-SQFP48
[LB1817W]
9.0
7.0
0.180.75 0.5
36
37
0.75
7.0
9.0
0.75
25
0.15
24
• Start/stop circuit (Low active)
• Switchable rotation speed
• Current limiter circuit
• Built-in index processing circuit
• Index timing adjustable by VR
• AGC circuit
• Thermal protection circuit
0.5
0.75
48
112
13
0.1
0.5
0.5
SANYO : SQFP48
1.7max
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage VCC max 7.0 V
Maximum output current ICC max1 t ≤ 0.5s 1.5 A
Maximum constant output current IO max2 1.0 A
Allowable power dissipation Pd max1 IC only 0.45 W
Operating temperature Topr –20 to +80 °C
Storage temperature Tstg –40 to +150 °C
Allowable Operating Ranges at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Power supply voltage V
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft's
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
CC
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
4.2 to 6.5 V
73099RM(KI)
No. 5805-1/9
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LB1817W
Electrical Characteristics at Ta = 25°C, VCC = 5V
Parameter Symbol Conditions
Current drain I
CCO
I
S/S = 5V (Standby) 70 100 µA
S/S = 0V (Normal) 25 35 mA
CC
MS1 bias current IMS1VMS1 = 5V 180 270 µA
MS1 Low input voltage VMS1L 0.0 0.8 V
MS1 High input voltage VMS1H 2 V
MS2 bias current IMS2VMS2 = 5V 90 135 µA
MS2 Low input voltage VMS2L 0.0 0.8 V
MS2 High input voltage VMS2H 2 V
MS3 bias current IMS3VMS3 = 5V 90 135 µA
MS3 Low input voltage VMS3L 0.0 0.8 V
MS3 High input voltage VMS3H 2 V
S/S bias current I
S/S Low voltage V
S/S High voltage V
Hall amplifier input bias current I
S/S
S/SL
S/SH
HB
Common mode input voltage range Vh 2.0
Differential input voltage range Vdif 50 200 mVp-p
Input offset voltage Vho * ±10 mV
Hall bias output voltage V
Leakage current V
IH = 5 mA 0.5 0.8 1.1 V
H
S/S = 5V ±10 µA
HL
Output saturation voltage V(sat) IO = 0.8A 0.45 0.64 V
Output leakage current I
Current limiter I
Control amplifier voltage gain G
Voltage gain phase differential ∆G
V/I conversion source current I
V/I conversion sink current I
V/I conversion current ratio I+/I
DSC buffer input current I
FG amplifier input voltage V
FG amplifier voltage gain G
FG amplifier input offset V
FG amplifier internal reference voltage
V
OL
lim
DSC
FG
FG
FGO
FGB
C
C
+
–
–
RF = 3 kΩ, R
= 100Ω 6.3 7.5 8.7 mA
OUT
fFG = 300 Hz 2 20 mVp-p
Open loop* 60 dB
* ±10 mV
FG Schmitt hysteresis width ∆Vsh1 High –> Low* 25 mV
∆Vsh2 Low –> High* 25 mV
Speed discriminator count N 1390/2
Discriminator operating frequency F
Oscillator frequency F
OSC
Oscillator frequency tolerance ∆F
Index output Low voltage V
Index output leakage current I
Index amplifier common mode input voltage range
Index amplifier differential input voltage range
Index amplifier hysteresis set current I
V
HYS
Timing adjustment at High level V
Timing adjustment at Low level V
Timing adjustment ratio T
Reference voltage V
Thermal protection operating temperature
REF
V
REF
TSD * 150 180 °C
* 1.1 MHz
D
* 1.1 MHz
OSC
IDLIO
IDL
V
I
DIF
TH
TL
HL
= 2 mA 0.4 V
Hysteresis width < 25 mA 25 100 mV
MS1 = L 1.15 1.26 1.35 V
MS1 = L 0.40 0.52 0.60 V
V
(MS1 = L) / VTH (MS1 = H) 1.148
TH
1 2.20 2.50 2.80 V
2 1.85 2.15 2.45 V
Hysteresis width ∆TSD * 10 °C
Note: Items shown to be “*” are not measured.
Ratings
min typ max
CC
CC
CC
20 µA
0.0 0.8 V
2VCCV
15 µA
VCC–0.7
1mA
–7.5 –5.5 –3.5 dB
±1dB
19 28 37 µA
–19 –28 –37 µA
0.8 1.0 1.2
1 µA
2.2 2.5 2.8 V
±0.2 %
±10 µA
0.2
VCC–0.7
2.9 4.2 5.5 µA
Unit
V
V
V
V
V
No. 5805-2/9
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LB1817W
Pin Assignment
Block Diagram
HU
HV
HW
NC
VIN2
VIN1
WIN2
WIN1
HB
V
AGC
DSC
CT
NC
NC
UIN1
U
V
V
W
W
AGC
CC
37
38
39
40
41
42
43
44
45
46
47
48
2
IN
1
IN
2
IN
1
IN
2
IN
UIN134UIN233WPB32W
36NC35
1
2
3
1
NC
REF
V
Hall amplifier
U
V
W
AGC
OUT
LB1817W
4
5NC6SG7
2
I/D
REF
V
Matrix
31NC30
OUT
VPB29V
UPB27U
28
10
MS38MS29MS1
V
CC
Current control
OUT
OUT
G
F
NC
26
25
24
23
22
21
20
19
18
17
16
15
14
13
11
12
–
I
NC
S/S
Output amplifier
U
V
W
Control
amplifier
NC
FG
FG
PG
Rf
NC
FC
X2
X1
+
I
NC
NC
–
+
Top view
R
F
U
PB
U
OUT
V
PB
V
OUT
W
PB
W
OUT
PGND
LB1817W
V
CC
750kΩ
12kΩ
N
0.22µF
1MHz
HB
S/S
1
V
REF
CT
I/D
+
I
–
I
FG OUT
–
FG
+
FG
X2
X1
V
2
REF
Hall bias
V
1
REF
FG amplifier
V
2
REF
TSD
Buffer amplifier
Timing
adjustment
5µA
Schmitt
comparator
1 / NOSC
MS1
(1:1.2)
H:1.2
L:1
H:360rpm
()
L:300rpm
(1:2)
H:2
L:1
MS3MS2
Current
limiter
V
LIM
V/I
Speed
discriminator
(1390/2 count)
SGND
FC
DSC
V
CC
No. 5805-3/9