The LV8800V is a motor driver for notebook PC fans.
Feature
•
Direct PWM sensorless motor driver
Specifications
Absolute Maximum Ratings
at Ta = 25°C
Parameter
Power supply voltage
Predrive voltage (gate voltage)
Output pin current
PWM input pin withstand voltage
FG output pin withstand voltage
FG output current
Power dissipation 1
Power dissipation 2
Operating temperature
Storage temperature
Symbol
VCC max
VG max
IOUT max
VPWM max
VFG max
IFG max
Pd max1
Pd max2
Topr
Tstg
Independent IC
Mounted on specified board *1
*2
Conditions
Ratings
6.5
10
0.7
VCC
6.0
5.0
0.3
0.8
-30 to +95
-55 to +150
Unit
V
V
A
V
V
mA
W
W
°C
°C
*1 : When mounted on 76.1mm×114.3mm×1.6mm glass epoxy board
*2 : Tj max = 150°C. Use the IC in the range where the temperature of the chip does not exceed Tj = 150°C during operation.
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Recommended Operating Conditions
at Ta = 25°C
Parameter
Power supply voltage
Symbol
VCC
Conditions
Ratings
2.2 to 6.0
Unit
V
Semiconductor Components Industries, LLC, 2013
May, 2013
82907 MS 20070726-S00002 / 62007 MS PC 20070529-S00004 No.A0845-1/7
LV8800V
Electrical Characteristics
Ta
=
25°C, VCC = 5V, unless specifically noted
Parameter
Power supply current 1
Power supply current 2
Charge pump output
Output voltage
Output block
Source
Sink
Source + sink
Startup oscillation pin
OSC pin charge current
OSC pin discharge current
PWM input pin
PWM pin high-level input voltage
PWM pin low-level input voltage
PWM pin input current
PWM input frequency
FG output pin
FG output pin low-level voltage
Current limiter circuit
Limiter voltage
Constraint protection circuit
Constraint protection detection time
Constraint protection release time
Thermal protection circuit
Thermal protection circuit operating
temperature
Temperature hysteresis width
ΔTSD
Design target *
30
°C
TSD
Design target *
150
180
°C
RDT1
RDT2
0.5
5
1.0
s
s
VRf
RF = 0.5Ω
0.225
0.25
0.275
V
VFG
When IO = 0.5mA
0.1
0.2
V
VPWMH
VPWML
IPWM
fPWM
PWM pin = 0V
20
25
VCC
×0.8
0
VCC
VCC
×0.2
-50
50
V
V
μA
kHz
IOSC1
IOSC2
-2.5
2.5
μA
μA
Ron (H)
Ron (L)
Ron (H+L)
IO = 0.5A, VG = 9.5V
IO = 0.5A, VCC = 5.0V
IO = 0.5A, VCC = 5V, VG = 9.5V
0.6
0.6
1.2
1.0
1.0
2
Ω
Ω
Ω
VG
9.8
V
Symbol
ICC1
ICC2
Conditions
min
PWM pin = VCC
PWM pin = 0V
Ratings
typ
1.8
20
max
2.5
50
mA
μA
Unit
* : Design target value and no measurement is made. The thermal protection circuit is incorporated to protect the IC from burnout or thermal destruction. Since
it operates outside the IC's guaranteed operating range, the customer's thermal design should be performed so that the thermal protection circuit will not be
activated when the fan is running under normal operating conditions.
Package Dimensions
unit : mm (typ)
3178B
1.0
Pd max – Ta
Specified circuit board : 76.1×114.3×1.6mm
3
glass epoxy board
5.2
16
9
Allowable power dissipation, Pd max – W
0.8
0.6
4.4
6.4
0.5
0.4
0.35
1
0.65
(0.33)
8
0.15
0.22
1.5max
0.2
0
–
30
–
20
0
20 25
40
60
80
95 100
SANYO : SSOP16(225mil)
0.1 (1.3)
Ambient temperature, Ta – °C
No.A0845-2/7
LV8800V
Pin Assignment
VO
UO
VCC
COM
COMIN
FIL
OSC
SGND
1
2
3
16 WO
15 RF
14 CPC
LV8800V
4
5
6
7
8
13 CP
12 VG
11 PWM
10 FG
9
F/R
Top view
Block Diagram
VG
VCC
WO
VO
UO
TSD
VREF
RF
SGND
CURRENT
LIMITTER
COM
SELECTOR
PRE DRIVE
LOCK PROTECT
LOGIC
COMIN
FIL
OSC
VG
CP
CPC
CHARGE
PUMP
MOSC
1/N
OSC
SENSORLESS
LOGIC
FG
PWM
FR
No.A0845-3/7
LV8800V
Pin Functions
Pin No.
3
Pin name
VCC
Function
Power supply for the IC and motor. A capacitor must
be connected between this pin and ground.
2
1
16
15
UO
VO
WO
RF
Output current detection. The drive current is
detected by connecting a resistor between this pin
and ground.
Output pins. Connect the motor coil.
Equivalent circuit
3
2
50kΩ
1
50kΩ
16
50kΩ
15
4
5
COM
COMIN
Motor middle point connection.
Motor position detection comparator filter pin. A
capacitor must be connected between this pin and
the FIL pin (pin 6).
VG
50kΩ
50kΩ
50kΩ
UO VO WO
6
FIL
Motor position detection comparator filter pin. A
capacitor must be connected between this pin and
the COMIN pin (pin 5).
4
1kΩ
6kΩ
6kΩ
1kΩ
5
6
7
OSC
Motor startup frequency setting. A capacitor must
be connected between this pin and ground. The
startup frequency is adjusted by controlling the
charge/discharge current (±2.5μA) and the
capacitance of the capacitor.
VCC
VCC
500Ω
7
500Ω
8
9
SGND
F/R
Ground for IC.
Motor rotation direction switching. A high-level input
causes current to flow into the motor in the order of
U, V, and W and a low-level input in the order of U,
W, and V. Changing the order of current application
turns the motor in the opposite direction.
VCC
Reverse signal
9
100kΩ
Forward signal
Forward/reverse
switching signal
10
FG
FG pulse output. This pin outputs a Hall sensor
system equivalent pulse signal.
10
11
PWM
PWM signal input. A high-level input turns on the
output transistors. A low-level input turns off the
output transistors and motor stops. The motor
speed is set by controlling the duty cycle of the input
PWM signal. The motor runs at full speed when this
pin is held open.
VCC
300kΩ
11
15kΩ
Continued on next page.
No.A0845-4/7
LV8800V
Continued from preceding page.
Pin No.
12
Pin name
VG
Function
Charge pump step-up output. A capacitor must be
connected between this pin and ground.
Equivalent circuit
13
VCC
14
12
13
CP
Charge pump step-up pulse output pin. A capacitor
must be connected between this pin and the CPC
pin (pin 14).
14
CPC
Charge pump step-up pin. A capacitor must be
connected between this pin and the CP pin (pin 13).
LV8800V Functional Description and Notes on External Components
Read the following notes before designing driver circuits using the LV8800V to design a system with fully satisfactory
characteristics.
1. Output drive circuit and speed control methods
The LV8800V adopts the synchronous commutation PWM drive method to minimize power loss in the output circuits.
Low on-resistance DMOS devices (total high and low side on-resistance of output block : 1.2Ω, typical) are used as
the output transistors.
The speed control of the driver is performed with an externally input PWM signal.
PWM controls the speed by performing switching in accordance with the duty cycle that is input to the PWM pin
(11-pin). The output transistor is on when a high-level voltage is input to the PWM pin, and off when a low-level
voltage is input. When the motor is used with the PWM pin open, the built-in resistor causes the PWM pin to change to
high-level voltage and the motor speed rises to full speed. When the PWM pin is fixed at low-level voltage, the motor
decelerates, and after the motor stops it enters “Power Saving Mode.
2. Soft Switching Circuit
This IC adopts variable duty soft switching to minimize the motor drive noise.
3. Current limiter circuit
The current limiter circuit limits the output current peak value to a level determined by the equation I = VRF/RF (VRF
= 0.25V typical). The current limiter circuit detects the peak current of the output transistors at the RF pin (pin 15) and
turns off the transistor of the PWM phase.
4. OSC circuit
The OSC pin (pin 7) is an oscillation pin provided for sensorless motor startup commutation. When a capacitor is
connected between the OSC pin and ground, the OSC pin starts self-oscillation, and this becomes the startup
frequency. The oscillator frequency can be adjusted by changing the value of the external capacitor (i.e. reducing the
value of the capacitor increases the startup frequency).
It is necessary to select a value of the capacitor that provides the optimal startup characteristics.
5. Position Detector Comparator Circuit for Rotor
The position detection comparator circuit for the rotor is a comparator for detecting rotor positional information with
the back EMF signal generated when the motor rotates. The IC determines the timing at which the output block applies
current to the motor based on the position information obtained here. Insert a capacitor (between 1,000 and 10,000pF)
between the COMIN pin (pin 5) and FIL (pin 6) to prevent any motor startup missoperation that is caused by the
comparator input noise.
6. FG Output Circuit
The FG pin (pin 10) is the FG output pin. It provides a pulse signal equivalent to that provided by systems that use a
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