Fujitsu MB3788 User's Manual
FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27209-3E
ASSP
SWITCHING REGULATOR
CONTROLLER
MB3788
■ DESCRIPTION
The MB3788 is a dual-channel PWM-type switching regulator controller; it incorporates a reference voltage.
The MB3788 has a PWM circuit and an output circuit as well as a reference voltage power supply with a voltage
accuracy of ±1%. The maximum operating frequency is 1 MHz. It is designed for a voltage-drop output switching
regulator suitable for a logic power supply or speed control of a DC motor.
The MB3788 is compatible with all master ICs producing triangular waves, saw-tooth waves and sine waves with
an amplitude of 1.3 V to 1.9 V.
It can be used in high-performance portable equipment such as a video camcorder or notebook personal computer
(word processor).
■ FEATURES
• Wide operating power supply voltage range: 3.6 V to 18 V
• Low power dissipation
• Operating: 1.9 mA (standard)
Standby: 10 µA Max
(Continued)
■ PACKAGE
24-pin Plastic SSOP
(FPT-24P-M03)
This device contains circuitry to protect the inputs against damage due to high static voltages or electric fields. However, it is
advised that normal precautions be taken to avoid application of any voltage higher than maximum rated voltages to this high
impedance circuit.
MB3788
(Continued)
• High-frequency operation: 100 kHz to 1 MHz
• On-chip timer and latch-type short-circuit detection circuit
• Wide error amplifier input voltage range: -0.2 V to VCC - 1.8 V
• On-chip high-accuracy reference voltage circuit: 2.50 V ±1%
• Output circuit
PNP transistor drive output pin: Push-pull type
ON/OFF current values set independently
• On-chip standby function and output control function
• High-density packaging: SSOP-24P
■ PIN ASSIGNMENT
(TOP VIEW)
VCC(out)
1
24
GND
OUT1
2
23
OUT2
VE1
3
22
VE2
Cb1
4
21
Cb2
Ca1
5
20
Ca2
FB1
6
19
FB2
-IN1(E)
7
18
-IN2(E)
+IN1(E)
8
17
+IN2(E)
-IN1(C)
9
16
-IN2(C)
-IN(PWN)
10
15
SCP
VCC
11
14
CTL2
VREF
12
13
CTL1
(FPT-24P-M03)
2
MB3788
■ PIN DESCRIPTION
Pin No.
Channel 1
Channel 2
Control
circuit
Power
circuit
Pin name
I/O
Descriptions
2
OUT1
O
Channel 1 push-pull type output
3
VE1
I
Channel 1 output current setting
4
Ca1
—
5
Cb1
—
Channel 1 output transistor OFF current setting: Output transistor OFF
The current is set by connecting a capacitor between pins Ca1 and Cb1.
6
FB1
O
Channel 1 error amplifier output
7
-IN1(E)
I
Channel 1 error amplifier inversion input
8
+IN1(E)
9
-IN1(C)
I
Channel 1 comparator inversion input
16
-IN2(C)
I
Channel 2 comparator inversion input
17
+IN2(E)
I
Channel 2 error amplifier non-inversion input
18
-IN2(E)
I
Channel 2 error amplifier inversion input
19
FB2
O
Channel 2 error amplifier output
20
Ca2
—
21
Cb2
—
Channel 2 output transistor OFF current setting: Output transistor OFF
The current is set by connecting a capacitor between pins Ca2 and Cb2.
22
VE2
I
Channel 2 output current setting
23
OUT2
O
Channel 2 push-pull type output
13
CTL1
I
Power and channel 1 control pin
H level: Power and channel 1 operating
L level: Standby
14
CTL2
I
Channel 2 control pin
When CTL1 pin = H level,
H level: Channel 2 operating
L level: Channel 2 OFF
15
SCP
—
Short-circuit protection circuit capacitor connection
1
VCC2
—
Output circuit power pin
10
-IN(PWM)
I
11
VCC1
—
Reference power and control circuit power
12
VREF
O
Reference voltage output
24
GND
—
Ground
Channel 1 error amplifier non-inversion input
Master oscillating waveform input
Note: The alphabetic characters in parenthesis above indicate the following input pins.
(C): Comparator
(E): Error amplifier
3
MB3788
■ BLOCK DIAGRAM
Cb1
Channel 1
4
5
Ca1
+IN1 (E)
+
8
-IN1 (E)
7
FB1
6
OFF current setting
+
-
Comparator 1
VCC(out)
2
OUT1
3
0.6 V -
9
1
PWM comparator 1
-
+
-IN1 (C)
Error amplifier 1
VE1
1.5 V
Ca2
Channel 2
20
21
Cb2
+IN2 (E)
17
-IN2 (E)
18
FB2
19
+
OFF current setting
+
-
PWM comparator 2
-
+
0.6 V
-IN2 (C)
Error amplifier 2
16
Timer circuit
23
Comparator 2
OUT2
22
VE2
1.5 V
-
SCP comparator +
14
CTL2
11
VCC
13
CTL1
1.9 V
1.3 V
2.1 V
1 µA
SCP
VREF
15
SR latch
circuit
4
Low input
voltage
protection
circuit
Reference Power/channel
ON/OFF
voltage
circuit
power (2.5 V)
10
12
-IN(PWM)
VREF
24
GND
MB3788
■ FUNCTIONAL DESCRIPTION
1. Major Functions
(1) Reference voltage power circuit
The reference voltage power supply produces a reference voltage (≈ 2.50 V) which is temperature-compensated
by the voltage supplied from the power pin (pin 11); it is used as the IC internal circuit operating power supply.
The reference voltage can also be output externally at 1 mA from VREF pin (pin12).
(2) Error amplifier
The error amplifier detects the switching regulator output voltage and outputs a PWM control signal. It has a
wide in-phase input voltage range of -0.2 V to VCC - 1.8 V to make setting from an external power supply easy.
Connecting the output pin and inversion input pin of the error amplifier through a feedback resistor and capacitor
allows setting of any loop gain to provide stable phase compensation.
(3) PWM comparator
The PWM comparator controls the output pulse ON time according to the input voltage.
The voltage input to the -IN pin (PWM) turns the output transistor on when it is lower than the output voltage of
the error amplifier.
(4) Output circuit
The output circuit is configured in a push-pull form and uses a PNP transistor drive system to drive a transistor
of up to 30 mA. (See How to Set Output Current.)
2. Channel Control Function
Channels can be set ON/OFF by combining the voltage levels at pin CTL1 (pin 13) and pin CTL2 (pin 14).
Channel ON/OFF Setting Conditions
Voltage level at CTL pin
CTL1
CTL2
L
×
H
H
Channel ON/OFF status
Power circuit
Channel 1
Channel
Stand by state*
ON
ON
L
OFF
*: The power current in the standby state is 10 µA Max.
5
MB3788
3. Protection Functions
(1) Timer and latch-type short-circuit protection circuit
The SCP comparator detects the output voltage levels of two comparators to detect an output short circuit. If
the output voltage of one comparator increases to 2.1 V, the transistor of the timer circuit is turned off and the
short circuit protection capacitor connected externally to the SCP pin (pin 15) starts charging.
The latch circuit turns off the output transistor and simultaneously clears the duty cycle to 0 when the output
voltage level of the comparator does not return to the normal voltage level until the capacitor voltage rises to the
base-emitter junction voltage VBE (≈ 0.65 V) of the transistor. (See How to Set Time Constant for Timer & LatchType Short-Circuit Protection Circuit.)
When the protection circuit operates, recycle the power to reset the circuit.
(2) Low input voltage malfunction fail-safe circuit
A transient at power-on, or an instantaneous supply voltage drop can cause a control IC malfunction, which may
damage the system. The low input voltage malfunction fail-safe circuit detects the internal reference voltage
level based on the supply voltage level, resets the latch circuit, turns off the output transistor, clears the duty
cycle to 0 and holds the SCP pin (pin 15) at Low level. All circuits are recovered when the supply voltage is
greater than the threshold voltage of the fail-safe circuit.
6
MB3788
■ ABSOLUTE MAXIMUM RATINGS
(TA = +25°C)
Parameter
Symbol
Conditions
Supply voltage
VCC
Control input voltage
Ratings
Unit
Min
Max
—
—
20
V
VICTL
—
—
20
V
Allowable loss
PD
Ta ≤ +25°C
—
500*
mW
Operating ambient temperature
TOP
—
-30
+85
°C
Storage temperature
Tstg
—
-55
+125
°C
*: Value obtained when mounted on 4 cm × 4 cm double-sided epoxy substrate
WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current,
temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.
■ RECOMMENDED OPERATING CONDITIONS
(TA = +25°C)
Parameter
Symbol
Conditions
Supply voltage
VCC
Reference voltage output current
Values
Unit
Min
Typ
Max
—
3.6
6.0
18
V
IOR
—
-1
—
0
mA
Error amplifier input voltage
VI
—
-0.2
—
VCC - 1.8
V
Error amplifier input voltage
VI
—
-0.2
—
VCC
V
VICTL
—
-0.2
—
18
V
IO
—
3.0
—
30
mA
Operating frequency
fosc
—
100
300
1000
kHz
Operating ambient temperature
Top
—
-30
25
85
°C
Control input voltage
Output current
WARNING: The recommended operating conditions are required in order to ensure the normal operation of the
semiconductor device. All of the device’s electrical characteristics are warranted when the device is
operated within these ranges.
Always use semiconductor devices within their recommended operating condition ranges. Operation
outside these ranges may adversely affect reliability and could result in device failure.
No warranty is made with respect to uses, operating conditions, or combinations not represented on
the data sheet. Users considering application outside the listed conditions are advised to contact their
FUJITSU representatives beforehand.
7
MB3788
■ ELECTICAL CHARACTERISTICS
(VCC =6V, TA = +25°C)
Parameter
Reference
voltage
Low voltage
malfunction
fail-safe
circuit
Short-circuit
detection
comparator
Short-circuit
detector
Error
amplifier
Symbol
Conditions
Value
Unit
Min
Typ
Max
2.475
2.500
2.525
V
Reference voltage
VREF
IOR = -1 mA
Output voltage temperature
variation
∆VREF/
VREF
TA = -30° to +85°C
-2
±0.2
2
%
Input stability
Line
VCC = 3.6 V to 18 V
—
2
10
mV
Load stability
Load
IOR = -0.1 mA to 1 mA
—
3
10
mV
Short-circuit output current
IOS
VREF = 2 V
-20
-8
-3
mA
VtH
—
—
2.65
—
V
VtL
—
—
2.45
—
V
Hysteresis width
VHYS
—
80
200
—
mV
Reset voltage
VR
—
1.5
1.9
—
V
Input offset voltage
VIO
—
0.58
0.65
0.72
V
Input bias current
IIB
-200
-100
—
nA
In-phase input voltage range
VICM
—
-0.2
—
VCC-1.8
V
Threshold voltage
VtPC
—
0.60
0.65
0.70
V
Input standby voltage
VSTB
—
—
50
100
mV
Input latch voltage
VI
—
—
50
100
mV
Input source current
IIbpc
—
-1.4
-1.0
-0.6
µA
Input offset voltage
VIO
VFB = 1.6 V
-10
—
10
mV
Input offset current
IIO
VFB = 1.6 V
-100
—
100
nA
Input bias current
IIB
VFB = 1.6 V
-200
-60
—
nA
In-phase input voltage range
VICM
—
-0.2
—
VCC-1.8
V
Voltage gain
AV
—
60
100
—
dB
Frequency bandwidth
BW
—
800
—
kHz
In-phase signal rejection ratio
CMRR
—
60
80
—
dB
VOM+
—
VREF-0.3
2.4
—
V
VOM-
—
—
0.05
0.5
V
Threshold voltage
VI = 0 V
AV = 0 dB
Maximum output voltage width
Output sink current
IOM+
VFB = 1.6 V
—
120
—
µA
Output source current
IOM-
VFB = 1.6 V
—
-2
—
mA
(Continued)
8
MB3788
(Continued)
Parameter
Symbol
Conditions
Vt0
Duty cycle = 0 %
Vt100
Duty cycle = 100 %
Values
Unit
Min
Typ
Max
1.05
1.3
—
V
—
1.9
2.25
V
Threshold voltage
PWM
comparator
Input sink current
IIM+
—
—
120
—
µA
Input source current
IIM-
—
—
-2
—
mA
Input bias current
IIB
-1.0
-0.5
—
µA
Threshold voltage
Vth
0.7
1.4
2.1
V
Control
VI = 0 V
—
IIH
VCTL = 5 V
—
100
200
µA
IIL
VCTL = 0 V
-10
—
10
µA
—
-40
—
mA
Input current
Output
Source current
IO
—
Sink current
IO
RB = 50 Ω
18
30
42
mA
Output leak current
ILO
VO = 18 V
—
—
20
µA
Standby current
ICCO
—
—
0
10
µA
Power current at output OFF
ICC
—
—
1.9
2.7
mA
All devices
9
MB3788
■ STANDARD CHARACTERISTIC CURVES
1. Power current - supply voltage characteristic
2. Reference voltage - supply voltage characteristic
TA = +25°C
CTL1 = 6 V
2.5
TA = +25°C
5
2.0
4
CTL1, 2 = 6 V
Power 1.5
current
lCC (mA)
1.0
Reference 3
voltage
VREF (V)
2
0.5
1
0
0
4
8
12
16
0
0
20
4
8
3.Reference voltage, output current setting pin voltage
- supply voltage characteristic
TA = +25°C
5
4
Reference
voltage
3
VREF (V)
VE
2
3
4
VCC = 6 V
VCTL1, 2 = 6 V
IOR = -1 mA
Reference 2.54
voltage
VREF (V) 2.52
2.50
Output
2 current
setting
pin voltage
1 VE (V)
2.48
2.46
2.44
-60 -40 -20 0
20 40 60 80 100
Ambient temperature TA (°C)
0
1
20
2.56
5
3
2
0
0
16
4. Reference voltage - ambient temperature characteristic
4
VREF
1
12
Supply voltage VCC (V)
Supply voltage VCC (V)
5
Supply voltage VCC (V)
5. Reference voltage - control voltage characteristic
VCC = 6 V
TA = +25°C
3.0
6. Control current - control voltage characteristic
2.8
400
Reference
voltage 2.6
VREF (V)
Control
current 300
lCTL1 (µA)
2.4
200
2.2
100
2.0
0
1
2
3
4
5
Control voltage VCTL1 (V)
VCC = 6 V
TA = +25°C
500
0
0
4
8
12
16
20
Control voltage VCTL1 (V)
(Continued)
10
MB3788
(Continued)
8.Gain - frequency characteristic and phase - frequency
characteristic
7. Duty - input oscillating frequency characteristic
100
Input waveform
Duty
Dtr (%)
VCC = 6 V
VFB = 1.6 V
TA = +25°C
1.9V
1.3V
80
TA = +25°C
40
90
20
Gain
(dB)
0
60
40
180
Phase
0 φ (deg)
20
-90
-20
0
0
5K 10K
50K 100K
500K 1M
Input oscillating frequency (Hz)
-180
-40
1K
10K
100K
1M
5M 10M
f (Hz)
9. Power dissipation - ambient temperature characteristic
Circuit for measuring gain - frequency characteristic and
phase - frequency characteristic
1000
2.5 V
VCC = 6 V
2.5 V
240 kΩ
800
4.7 kΩ
Power
600
dissipation
PD (mW)
400
in
4.7 kΩ
10 µF
- +
out
+
Error amplifier
200
4.7 kΩ 4.7 kΩ
0
-20 020 4060 80 100
Ambient temperature TA (°C)
11
MB3788
■ HOW TO SET OUTPUT VOLTAGE
VREF
VOUT
VOUT =
R
R1
+
-
R
R2
RNF
Note: Set the output voltage in the positive range (VOUT > 0).
12
VREF
2 × R2
(R1 + R2)
MB3788
■ HOW TO SET OUTPUT CURRENT
The output circuit is configured in a push-pull type as shown in Figure 1. The ON current value of the output
current waveform shown in Figure 2 is a constant current and the OFF value set by RE is set by a time constant.
Each output current can be calculated from the following expression:
• ON current = 1.5/RE (A) (Output current setting pin voltage: VE ≈ 1.5 V)
• The OFF current time constant is proportional to the value of CB.
Drive Tr
ON current
CB
OFF
current
OFF current
setting part
Output 0
current
ON current
RE
OFF current
VE
t
Fig.1 Output Circuit Diagram
Fig.2 Output Current Waveform
1000 pF
4
-IN1 (C)
VCC
(5 V)
22 µH
5
1
Iout
MB3788
8.2 kΩ
10 µF
2.7 kΩ
2
1000 pF
3
Fig.3 Output Pin Voltage and Current Waveforms (Channel 1)
Vout
-IN1 (E)
150 Ω
Fig.4 Measurement Circuit Diagram
13
MB3788
■ HOW TO SET TIME CONSTANT FOR TIMER & LATCH-TYPE SHORT-CIRCUIT
PROTECTION CIRCUIT
If the load conditions of the switching regulator are stable, the outputs of comparators 1 and 2 do not change,
so the SP comparator outputs a High level. At this time, the SCP pin (pin 15) is held at about 50 mV.
If the load conditions change suddenly due to a load short-circuit, for example, the output voltage of the comparator of the channel becomes a High-level signal (more than 2.1 V). Then, the SVP comparator outputs a
Low level and transistor Q1 is turned off. The short-circuit protection capacitor CPE externally connected to the
SCP pin starts to charge.
VPE = 50 mV + tPE × 10-6/CPE
0.65 = 50 mV + tPE × 10-6/CPE
CPE = tPE /0.6 (s)
Once the capacitor CPE is charged to about 0.65 V, the SR latch is set and the output drive transistor is turned
off. At this time, the duty cycle is made low and the output voltage of the SCP pin (pin 15) is held at Low level.
This closes the SR latch input to discharge CPE.
2.5 V
1 µA
15
Comparator 1
Comparator 2
+
Q2
Q1
S
CPE
R
SR latch-type
circuit
Low
PWM
input
voltage comparator
protection
circuit
2.1 V
Fig. 5 Latch-Type Short-Circuit Protection Circuit
14
OUT
MB3788
■ PROCESSING WITHOUT USING SCP PIN
If the timer and latch-type short-circuit protection circuit is not used, connect the SCP pin (pin 15) to GND as
close as possible. Also, connect the input pin of each channel comparator to the VCC pin (pin 11).
11
VCC
9
-IN1 (C)
16
-IN2 (C)
SCP
15
GND
24
Fig. 6 Processing without using SCP Pin
15
MB3788
■ EQUIVALENT SERIES RESISTANCE OF SMOOTHING CAPACITOR AND STABILITY OF
DC/DC CONVERTER
The equivalent series resistance (ESR) of the smoothing capacity in a DC/DC converter has a great effect on
the loop phase characteristics.
The ESR causes a small delay at the capacitor with a series resistance of 0 (Figures 8 and 9), thus improving
system stability. On the other hand, using a smoothing capacitor with a low ESR reduces system stability.
Therefore, attention should be paid to using semiconductor electrolytic capacitors (such as OS capacitors) or
tantalum capacitors with a low ESP. (Phase margin reduction by using an OS capacitor is explained on the next
page.)
L
Tr
RC
VIN
D
RL
C
Fig. 7 Basic Voltage-Drop Type DC/DC Converter Circuit
20
0
0
(2)
Gain -20
(dB)
(2)
-40
(1): RC = 0 Ω
(2): RC = 31 mΩ
100
(1)
1k
10k
Frequency f (Hz)
Fig.8 Gain - Frequency Characteristic
16
(1)
(1): RC = 0 Ω
(2): RC = 31 mΩ
-180
-60
10
Phase -90
(deg)
100k
10
100
1k
10k
100k
Frequency f (Hz)
Fig.9 Phase - Frequency Charecteristic
MB3788
(Reference Data)
The phase margin is halved by changing the smoothing capacitor from an aluminum electrolytic capacitor (Rc
= 1.0 Ω) to a semiconductor electrolytic capacitor (OS capacitor: Rc = 0.2 Ω) with a low ESR (Figures 11 and 12).
VOUT
VO+
CNF
AV - φ characteristic between VOUT and VIN
+
-
FB
R2
-IN
VIN
+IN
R1
VREF/2
Error amplifier
Fig. 10 DC/DC Converter AV - φ Characteristic Measurement Diagram
Aluminum electrolytic capacitor gain - frequency and phase - frequency characteristics (DC/DC converter +5 V output)
60
VCC = 10 V
RL = 25 Ω
180
CP = 0.1 µF
40
AV
ϕ⇒
90
VO+
20
Gain
+
62°
(dB)
Phase
0 (deg)
0
-20
-90
-40
101001 k 10 k 100 k
-180
GND
Aluminum electrolytic capacitor
220 µF (16 V)
Rc ≈ 1.0 Ω: fOSC = 1 kHz
Frequency f (Hz)
Fig. 11 Gain - Frequency Characteristic
OS capacitor gain - frequency and phase - frequency characteristics (DC/DC converter +5 V output)
60
VCC = 10 V
RL = 25 Ω
CP = 0.1 µF
AV
40
20
Gain
(dB)
0
180
ϕ⇒
90
27°
0
VO+
Phase
(deg)
-20
-90
-40
101001 k 10 k 100 k
-180
+
GND
OS capacitor
22 µF (16 V)
Rc ≈ 1.2 Ω: fOSC = 1 kHz
Frequency f (Hz)
Fig.12 Phase - Frequency Characteristic Curves
17
MB3788
■ APPLICATION CIRCUIT
10 µH
VCC
13
+
-
+
-
33 µF
11
14
VCC
CTL1 CTL2
4.7 kΩ
8
Cb1
+IN1 (E)
Ca1
5
VCC(out)
1
OUT1
2
8.2 kΩ
7
2.7 kΩ 0.22 µF
<Logic power supply>
4
1000 pF
4.7 kΩ
(a)
Channel 1
(dB)
-IN1 (E)
100 kΩ
9
-IN1 (C)
17
+IN2 (E)
VE1
5V
+
-
150 Ω
3
(15 mA)
(b)
4.7 kΩ
Ca2
20
Cb2
21
OUT2
23
1000 pF
3.8 kΩ
18
-IN2 (E)
Channel 2
(deg)
100 kΩ
19
FB2
16
-IN2 (C)
VREF
12
22 µH
3V
+
-
150 Ω
VE2
SCP
-IN(PWM)
GND
10
24
15
0.1 µF
22
⇑
Triangular wave signal
1.9 V
1.3 V
CT
<Analog power supply>
<Sensor power supply>
+15 V
+24 V
<MB3785A-used DC/DC converter>
<DC motor speed control>
DC motor 1
<DC motor speed control>
DC motor 2
18
10 µF
<Logic power supply>
4.7 kΩ
2.7 kΩ 0.22 µF
(a)
22 µH
FB1
6
(b)
33 µF
10 µF
MB3788
■ NOTES ON USE
• Take account of common impedance when designing the earth line on a printed wiring board.
• Take measures against static electricity.
- For semiconductors, use antistatic or conductive containers.
- When storing or carrying a printed circuit board after chip mounting, put it in a conductive bag or container.
- The work table, tools and measuring instruments must be grounded.
- The worker must put on a grounding device containing 250 kΩ to 1 MΩ resistors in series.
• Do not apply a negative voltage
- Applying a negative voltage of −0.3 V or less to an LSI may generate a parasitic transistor, resulting in
malfunction.
■ ORDERING INFORMATION
Part number
MB3788PFV
Package
Remarks
24-pin Plastic SSOP
(FPT-24P-M03)
19
MB3788
■ PACKAGE DIMENSION
Note 1)
Note 2)
Note 3)
Note 4)
24-pin plastic SSOP
(FPT-24P-M03)
*1 : Resin protrusion. (Each side : +0.15 (.006) Max) .
*2 : These dimensions do not include resin protrusion.
Pins width and pins thickness include plating thickness.
Pins width do not include tie bar cutting remainder.
0.17±0.03
(.007±.001)
*17.75±0.10(.305±.004)
24
13
*2 5.60±0.10
7.60±0.20
(.220±.004) (.299±.008)
INDEX
Details of "A" part
+0.20
1.25 –0.10
+.008
.049 –.004
(Mounting height)
0.25(.010)
1
"A"
12
0~8˚
+0.08
0.65(.026)
0.24 –0.07
+.003
.009 –.003
0.13(.005)
M
0.50±0.20
(.020±.008)
0.60±0.15
(.024±.006)
0.10±0.10
(.004±.004)
(Stand off)
0.10(.004)
C
2003 FUJITSU LIMITED F24018S-c-4-5
Dimensions in mm (inches) .
Note : The values in parentheses are reference values.
20
MB3788
FUJITSU LIMITED
All Rights Reserved.
The contents of this document are subject to change without notice.
Customers are advised to consult with FUJITSU sales
representatives before ordering.
The information, such as descriptions of function and application
circuit examples, in this document are presented solely for the
purpose of reference to show examples of operations and uses of
Fujitsu semiconductor device; Fujitsu does not warrant proper
operation of the device with respect to use based on such
information. When you develop equipment incorporating the
device based on such information, you must assume any
responsibility arising out of such use of the information. Fujitsu
assumes no liability for any damages whatsoever arising out of
the use of the information.
Any information in this document, including descriptions of
function and schematic diagrams, shall not be construed as license
of the use or exercise of any intellectual property right, such as
patent right or copyright, or any other right of Fujitsu or any third
party or does Fujitsu warrant non-infringement of any third-party’s
intellectual property right or other right by using such information.
Fujitsu assumes no liability for any infringement of the intellectual
property rights or other rights of third parties which would result
from the use of information contained herein.
The products described in this document are designed, developed
and manufactured as contemplated for general use, including
without limitation, ordinary industrial use, general office use,
personal use, and household use, but are not designed, developed
and manufactured as contemplated (1) for use accompanying fatal
risks or dangers that, unless extremely high safety is secured, could
have a serious effect to the public, and could lead directly to death,
personal injury, severe physical damage or other loss (i.e., nuclear
reaction control in nuclear facility, aircraft flight control, air traffic
control, mass transport control, medical life support system, missile
launch control in weapon system), or (2) for use requiring
extremely high reliability (i.e., submersible repeater and artificial
satellite).
Please note that Fujitsu will not be liable against you and/or any
third party for any claims or damages arising in connection with
above-mentioned uses of the products.
Any semiconductor devices have an inherent chance of failure. You
must protect against injury, damage or loss from such failures by
incorporating safety design measures into your facility and
equipment such as redundancy, fire protection, and prevention of
over-current levels and other abnormal operating conditions.
If any products described in this document represent goods or
technologies subject to certain restrictions on export under the
Foreign Exchange and Foreign Trade Law of Japan, the prior
authorization by Japanese government will be required for export
of those products from Japan.
F0309
 FUJITSU LIMITED Printed in Japan
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement