FAN53713
1.5 A Synchronous Buck
Regulator
Description
The FAN53713 is a Super Low Iq, step−down switching voltage
regulator, that delivers a fixed output from an input voltage supply of
2.3 V to 5.5 V. Using a proprietary architecture with synchronous
rectification, the FAN53713 is capable of delivering a peak efficiency
of 93%, while maintaining efficiency over 90% at load currents as low
as 1 mA.
The regulator operates with 0402 and 0603 input and output
capacitors, respectively, which reduces the total solution size to
5.5 mm2. At moderate and light load, Pulse Frequency Modulation
(PFM) is used to operate the device with a low quiescent current. Even
with such a low quiescent current, the part exhibits excellent transient
response during load swings. In Shutdown Mode, the supply current
drops to 100 nA, reducing power consumption. The Mode pin allows
the part to be in a Super Low IQ (SLIQ) mode with a typical quiescent
current of 2 mA.
The FAN53713 is available in 6−bump, 0.4 mm pitch, Wafer−Level
Chip−Scale Package (WLCSP).
Features
•
•
•
•
•
•
•
•
•
•
•
•
2 mA Typical Quiescent Current
5.5 mm2 Total Solution Size
1.5 A Output Current Capability
0.6 V to 1.8 V Fixed Output Voltage
2.3 V to 5.5 V Input Voltage Range
Best−in−Class Load Transient Response
Best−in−Class Efficiency with Sub 1 mA Output Currents
Internal Soft−Start Limits Battery Current Below 150 mA to avoid
Brown−out Scenarios
Protection Faults (UVLO, OCP and OTP)
Thermal Shutdown and Overload Protection
6−Bump WLCSP, 0.4 mm Pitch
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
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WLCSP6 1.38 0.94 0.625
CASE 567UH
MARKING DIAGRAM
12KK
XYZ
12
KK
X
Y
Z
= Alphanumeric Device Marking
= Lot Run Code
= Alphabetical Year Code
= 2 Weeks Date Code
= Assembly Plant Code
ORDERING INFORMATION
See detailed ordering and shipping information on page 2 of
this data sheet.
2.2 mF
SW
VIN
CIN
1.0 mH
FAN53713
MODE
EN
L1
VOUT
COUT
22 mF
FB
GND
Applications
•
•
•
•
•
•
•
Figure 1. Typical Application
Wearables
Smart Watch
Health Monitoring
Sensor Drive
Energy Harvesting
Utility and Safety Modules
RF Modules
© Semiconductor Components Industries, LLC, 2017
June, 2018 − Rev. 1
1
Publication Order Number:
FAN53713/D
FAN53713
Table 1. ORDERING INFORMATION
Part Number
Output Voltage
(Note 1)
Max. Output
Current (Note 1)
Temperature
Range
Package
Packing
Method
Device
Marking
FAN53713UC02X
0.7 V
1.5 A
−40 to 85°C
WLCSP
Tape & Reel
GJ
1. Other voltage and output current options are available. Contact an On Semiconductor representative.
Table 2. RECOMMENDED EXTERNAL COMPONENTS
Component
Description
Vendor
Parameter
Typ.
Unit
L
1.0 mH, 20%, 2.3 A, 107 mW, 1608
DFE160810S−1R0M (Murata)
L
1.0
mH
CIN
2.2 mF, 20%, 6.3 V, X5R, 0402
C1005X5R0J225M050BC (TDK)
C
2.2
COUT (Note 1)
22 mF, 20%, 6.3 V, X5R, 0603
C1608X5R0J226M080AC (TDK)
C
22
mF
1. A 10 mF, 0402 capacitor can be used to reduce total solution size at the expense of load transient performance.
Pin Configuration
EN
A1
A2
VIN
VIN
A2
A1
EN
MODE
B1
B2
SW
SW
B2
B1
MODE
FB
C1
C2
GND
GND
C2
C1
FB
Figure 2. Top View
Figure 3. Bottom View
Table 3. PIN DEFINITIONS
Pin #
Name
A1
EN
Enable. The device is in Shutdown Mode when voltage to this pin is 1.2 V. Do not leave this pin floating. Recommended for GPIO 1.8 V to drive this pin
A2
VIN
Input Voltage. Connect to input power source across CIN
B1
MODE
Description
MODE. Logic “LOW” allows the IC to be in a Super Low IQ (SLIQ) state. A Logic HIGH
allows the part to be in normal Iq state Auto Mode
B2
SW
Switching Node. Connect to SW pad of inductor
C1
FB
Feedback. Connect to positive side of output capacitor
C2
GND
Ground. Power and IC ground. All signals are referenced to this pin
Table 4. ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Min.
Max.
Unit
VIN
Input Voltage
−0.3
6.5
V
VSW
Voltage on SW Pin
−0.3
VIN + 0.3 (Note 1)
V
EN, FB and Mode Pin Voltage
−0.3
VIN + 0.3 (Note 1)
V
VCTRL
ESD
Human Body Model per JESD22−A114
2.0
Charged Device Model per JESD22−C101
1.0
kV
TJ
Junction Temperature
−40
+150
°C
TSTG
Storage Temperature
−40
+150
°C
+260
°C
TL
Lead Soldering Temperature, 10 Seconds
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
1. Lesser of 6 V or VIN + 0.3 V.
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2
FAN53713
Table 5. RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Max.
Unit
2.3
5.5
V
Continuous Output Current
0
1.5
A
Pulsed Output Current, 100 ms
0
1.6
VIN
Supply Voltage Range
IOUT
CIN
COUT (Note 1)
Min.
Typ.
Input Capacitor
A
mF
2.2
100
mF
1.3
mH
−40
+85
°C
−40
+125
°C
Output Capacitor
3
L
Inductor
0.47
TA
Operating Ambient Temperature
TJ
Operating Junction Temperature
1.0
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond
the Recommended Operating Ranges limits may affect device reliability.
1. Effective capacitance after DC bias.
Table 6. THERMAL PROPERTIES
Symbol
θJA
Parameter
Min.
Junction−to−Ambient Thermal Resistance (Note 1)
Typ.
Max.
Unit
°C/W
125
1. Junction−to−ambient thermal resistance is a function of application and board layout. This data is simulated with four−layer 2s2p boards with
vias in accordance to JESD51− JEDEC standard. Special attention must be paid not to exceed the junction temperature.
Table 7. ELECTRICAL CHARACTERISTICS Minimum and Maximum Values are at VIN = VEN = 3.6 V, TA = −40°C to
+85°C, unless otherwise noted. Typical values are at TA = 25°C, VIN = VEN = 3.6 V, VOUT = 1.8 V
Symbol
Parameter
Condition
Min.
Typ.
Max.
Unit
IQ,SLIQ
Quiescent Current
SLIQ Mode, no load, non−switching
2
mA
IQ,PFM
PFM Quiescent Current
PFM Mode, no load, non−switching
5
mA
Shutdown Supply Current
EN=GND, VIN=3.6 V, no load
Under−Voltage Lockout Threshold
VIN Rising
2.10
2.15
2.21
V
VIN Falling
2.00
2.05
2.10
V
ISD
VUVLO_RISE
VUVLO_FALL
100
nA
VIH
HIGH−Level Input Voltage
VIL
LOW−Level Input Voltage
ILIM
Peak Current Limit
VIN = 4.35 V
Output Voltage Accuracy
VOUT = 0.6 V to 1.8 V, IOUT(DC) = 0,
PWM Mode
−25
+25
mV
VOUT = 0.6 V to 1.8 V, IOUT(DC )= 0,
PFM Mode
−40
+40
mV
VOACC
RDS(on)
1.2
V
0.4
2215
V
mA
PMOS On Resistance
VIN = VGS = 3.6 V
135
mW
NMOS On Resistance
VIN = VGS = 3.6 V
95
mW
TTSD
Thermal Shutdown
150
°C
THYS
Thermal Shutdown Hysteresis
15
°C
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
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3
FAN53713
Table 8. SYSTEM CHARACTERISTICS The following system characteristics are guaranteed by design and are not performed in
production testing. Recommended operating conditions, unless otherwise noted, VIN = 2.3 V to 5.5 V, TA = −40°C to +85°C, VOUT = 1.8
V. Typical values are given at TA = 25°C, VIN = 3.6 V. System characteristics are based on circuit per Figure 1.
L = 1.0 mH, 2.3 A, 107 mW DCR, DFE160810S−1R0M (Murata), CIN = 1 × 2.2 mF, 6.3 V, 0402 (1005 metric), C1005X5R0J225M050BC
(TDK) and COUT = 1 × 22 mF, 6.3 V, 0603 (1608 metric), C1608X5R0J226M080AC (TDK).
Symbol
Parameter
LOADREG
Load Regulation
LINEREG
Line Regulation
VOUT_RIPPLE
Ripple Voltage
Eff
Eff
ΔVOUT_LOAD
ΔVOUT_LINE
Efficiency
Efficiency
Load Transient
Line Transient
Condition
Min.
Typ.
Max.
Unit
IOUT = 10 mA to 1 mA, SLIQ Mode
−9.0
mV/mA
IOUT = 200 mA to 300 mA, PWM
−2.0
mV/A
3.0 V ≤ VIN ≤ 4.35 V,
IOUT = 1 A, PWM
−0.5
mV/V
IOUT = 250 mA, SLIQ Mode
40
mV
IOUT = 20 mA, PFM Mode
25
IOUT = 200 mA, PWM Mode
5
IOUT = 100 mA, SLIQ Mode
88
IOUT = 500 mA, SLIQ Mode
91
IOUT = 1 mA, PFM Mode
90
IOUT = 100 mA, PFM Mode
91
IOUT = 300 mA, PWM Mode
91
IOUT = 500 mA, PWM Mode
90
IOUT = 700 mA, PWM Mode
88
IOUT = 10 mA ⇔ 150 mA,
TR = TF = 1 ms, Auto Mode
±40
mV
IOUT = 100 mA ⇔ 500 mA,
TR = TF = 1 ms, SLIQ Mode
±15
mV
VIN = 3.0 V ⇔ 3.6 V, TR = TF = 10 ms,
IOUT = 300 mA, PWM Mode
±20
mV
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4
%
%
FAN53713
Typical Characteristics
94%
94%
90%
90%
86%
86%
Efficiency
Efficiency
Unless otherwise specified, VIN = 3.6 V, VOUT = 1.8 V, Auto Mode, TA = 25°C; circuit and components according to Figure 1 and Table 2.
82%
VIN = 2.5 V
VIN = 3.0 V
VIN = 3.6 V
VIN = 4.2 V
VIN = 5.0 V
78%
74%
70%
1
10
100
Load Current (mA)
78%
70%
1
1,000
90%
85%
85%
80%
80%
Efficiency
Efficiency
95%
90%
75%
VIN = 2.5 V
VIN = 3.0 V
VIN = 3.6 V
VIN = 4.2 V
VIN = 5.0 V
65%
60%
55%
50%
0.01
0.10
Load Current (mA)
10
100
Load Current (mA)
1,000
Figure 5. Efficiency vs. Load Current and
Temperature, VIN = 3.6 V , VOUT = 1.8 V, Auto Mode
95%
70%
−40°C
+25°C
+85°C
74%
Figure 4. Efficiency vs. Load Current and Input
Voltage, VOUT = 1.8 V, Auto Mode
75%
70%
65%
−40°C
+25°C
+85°C
60%
55%
50%
0.01
1.00
Figure 6. Efficiency vs. Load Current and Input Voltage,
VOUT = 1.8 V, SLIQ Mode
0.10
Load Current (mA)
1.00
Figure 7. Efficiency vs. Load Current and
Temperature, VIN = 3.6 V , VOUT = 1.8 V, SLIQ Mode
3,000
60
Output Ripple (mVpp)
Switching Frequency (KHz)
82%
2,500
2,000
1,500
1,000
VIN = 2.5 V
VIN = 3.0 V
VIN = 3.6 V
VIN = 4.2 V
500
0
0
250
500
750
VIN = 2.5 V
VIN = 3.0 V
VIN = 3.6 V
VIN = 4.2 V
50
40
30
20
10
1000
1250
0
1500
0
Load Current (mA)
250
500
750
1000
1250
1500
Load Current (mA)
Figure 8. Frequency vs. Load Current and Input Voltage,
Auto Mode, VOUT = 1.8 V, Auto Mode
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Figure 9. Output Ripple vs. Load Current and
Input Voltage, VOUT = 1.8 V, Auto Mode
FAN53713
Typical Characteristics (continued)
Unless otherwise specified, VIN = 3.6 V, VOUT = 1.8 V, Auto Mode, TA = 25°C; circuit and components according to Figure 1 and Table 2.
2.0
VIN = 2.5 V
VIN = 3.0 V
VIN = 3.6 V
VIN = 4.2 V
VIN = 5.0 V
1.5
1.0
Output Regulation (%)
Output Regulation (%)
2.0
0.5
0.0
−0.5
1.5
1.0
0.5
0.0
−0.5
−1.0
−40°C
+25°C
+85°C
−1.5
−2.0
−1.0
0
250
500
750
1000
1250
0
1500
250
500
750
1000
1250
1500
Load Current (mA)
Load Current (mA)
Figure 10. Output Regulation vs. Load Current and
Input Voltage, VOUT = 1.8 V, Auto Mode
Figure 11. Output Regulation vs. Load Current and
Temperature, VIN = 3.6 V, VOUT = 1.8 V, Auto Mode
4
8
Input Current (mA)
Input Current (mA)
7
6
5
4
−40°C
+25°C
+85°C
3
2
2.3
2.8
3.3
3.8
4.3
Input Voltage (V)
4.8
3
2
1
−40°C
−405C
+25°C
+255C
+85°C
+855C
0
5.3
2.3
2.8
3.3
3.8
4.3
Input Voltage (V)
4.8
5.3
Figure 13. Quiescent Current vs. Input Voltage and
Temperature, VOUT = 1.8 V, SLIQ Mode
Figure 12. Quiescent Current vs. Input Voltage and
Temperature, VOUT = 1.8 V, Auto Mode
Input Current (mA)
0.5
−40°C
+25°C
+85°C
0.4
0.3
0.2
0.1
0.0
2.3
2.8
3.3
3.8
4.3
Input Voltage (V)
4.8
5.3
Figure 14. Shutdown Current vs. Input Voltage
and Temperature
Figure 15. Load Transient, VIN = 3.6 V, VOUT = 1.8 V,
10 mA 150 mA, 1 ms Edge, Auto Mode
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FAN53713
Typical Characteristics (continued)
Unless otherwise specified, VIN = 3.6 V, VOUT = 1.8 V, Auto Mode, TA = 25°C; circuit and components according to Figure 1 and Table 2.
Figure 16. Load Transient, VIN = 3.6 V, VOUT = 1.8 V,
5 mA 300 mA, 1 ms Edge, Auto Mode
Figure 17. Load Transient, VIN = 3.6 V, VOUT = 1.8 V,
100 mA 300 mA, 1 ms Edge, Auto Mode
Figure 19. Line Transient, VIN = 3.0 V 3.6 V,
VOUT = 1.8 V, 10 ms Edge, 300 mA Load, Auto Mode
Figure 18. Load Transient, VIN = 3.6 V, VOUT = 1.8 V,
10 mA 1500 mA, 1 ms Edge, Auto Mode
Figure 20. Start−up, VIN= 3.6 V, VOUT= 1.8 V,
50 mA Resistive Load, Auto Mode
Figure 21. Start−up, VIN= 3.6 V, VOUT= 1.8 V,
300 mA Resistive Load, Auto Mode
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FAN53713
Operation Description
The FAN53713 is a Super Low Iq (SLIQ), step−down
switching voltage regulator, typically operating at 2.5 MHz
in Continuous Conduction Mode(CCM). Using a
proprietary architecture with synchronous rectification, the
FAN53713 is capable of delivering a peak efficiency of
93%, while maintaining efficiency over 90% at load currents
sub 1mA.
In SLIQ mode the device is very efficient with load
currents in the uA range. In SLIQ mode the device draws less
than 2 mA typical from the battery with no load. The load
transients in SLIQ mode are best in class.
The FAN53713 provides a fixed output voltage of 0.6 V
to 1.8 V and load capability of 1.5 A, which can support
wearable or mobile phone applications which use Li−Ion
batteries. Specialized soft−start limits the battery current to
150 mA to limit any brown out occurrences.
this point, the high−side switch turns off, preventing high
currents from causing damage. The regulator continues to
limit the current cycle−by−cycle. After 500 ms of current
limit, the regulator triggers an over−current fault, causing
the regulator to shut down for about 20 ms before attempting
a restart.
Under−Voltage Lockout (UVLO)
When EN is HIGH, the under−voltage lockout keeps the
part from operating until the input supply voltage rises high
enough to properly operate. This ensures no misbehavior of
the regulator during startup or shutdown.
Over−Temperature Protection (OTP)
When the die temperature increases, due to a high load
condition and/or a high ambient temperature, the output
switching is disabled until the die temperature falls
sufficiently. The junction temperature at which the thermal
shutdown activates is nominally 150°C with a 15°C
hysteresis. Once the junction temperature falls below the
hysteresis threshold, the regulator performs a soft−start.
Control Scheme
Enable and Disable
When EN pin is Low, all circuits are off and the IC draws
100 nA current. When EN is High and VIN is above its
UVLO threshold, the regulator begins a soft−start cycle. The
FAN53713 has internal soft−start which limits the battery
current draw to 150 mA. Once the part reaches 95% of VOUT
target, the part will transition to the correct mode of
operation depending on load current. The part starts up
within 400 ms typical with the recommended external
components listed in Table 2.
Modes of Operations
SLIQ (Super Low IQ)
Protection Features
In SLIQ Mode the device acts in a modified PFM mode
with a super low Iq state. The part draws 2 mA with no load.
The part enters SLIQ Mode when the Mode pin is set to
logic “LOW”. Before pulling the Mode Pin Low, the load
current should drop below 1 mA to maintain output voltage
regulation in SLIQ mode. The maximum load current in
SLIQ Mode that the device can support is 1 mA. If load
current exceeds 1 mA, it is recommended to place part in
Auto Mode by pulling Mode pin High so that the device can
support more current.
The part can support more than 1 mA in SLIQ Mode if the
output capacitor is increased.
VOUT Fault
PFM
If the VOUT fails to reach 95% of VOUT target within 1.8
ms during startup, a VOUT fault is declared. During the fault
condition the part restarts every 20 ms to achieve the 95%
target voltage. Once the output voltage reaches the 95%
VOUT target voltage within 1.8 ms during startup, the VOUT
fault clears.
At light load operation in Auto Mode, the device enters
PFM mode when load current is below 100 mA typically.
PFM mode reduces switching frequency as well as battery
current draw, which yields high efficiency.
When Mode pin goes High, the part will transition from
SLIQ Mode into normal PFM mode within 10 ms, typically.
Over−Current Protection (OCP)
PWM
A heavy load or short circuit on the output causes the
current in the inductor to increase until a maximum current
threshold is reached in the high−side switch. Upon reaching
When load is high, the part transitions smoothly from
PFM mode to PWM mode. The part enters PWM mode
when load current exceeds 132 mA, typically.
MODE Pin
Setting Mode Pin Low sets the device in SLIQ mode;
setting Mode Pin High sets the device in normal Iq Auto
Mode.
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FAN53713
Applications Information
physical inductor size, increased inductance usually results
in an inductor with lower saturation current and higher DCR.
Table 3 shows the effects of inductance higher or lower
than the recommended 1.0 mH on regulator performance.
Selecting the Inductor
The output inductor must meet both the required
inductance and the energy-handling capability of the
application. The inductor value affects average current limit,
output voltage ripple, and efficiency.
The ripple current (ΔI) of the regulator is:
DI ≈
V OUT
V IN
ǒ
V IN * V OUT
L f SW
Ǔ
Output Capacitor
Increasing COUT has no effect on loop stability and can
therefore be increased to reduce output voltage ripple or to
improve transient response. Vice versa, lower COUT can be
used but with a compromise of load transient response.
Output voltage ripple, ΔVOUT, is:
(eq. 1)
The maximum average load current, IMAX(LOAD), is
related to the peak current limit, ILIM(PK), by the ripple
current, given by:
I MAX(LOAD) + I LIM(PK) *
DI
2
DV OUT + DI L
DI
2
ǸI
(eq. 3)
2
OUT(DC)
)
DI 2
12
1
F SW
ƫ
C OUT (eq. 5)
PCB Layout Guidelines
1. The input capacitor (CIN) should be connected as
close as possible to the VIN and GND pins
Connect to VIN and GND using only top metal.
Do not route through vias (see Figure 22)
2. Place the inductor (L) as close as possible to the
IC. Use short wide traces for the main current
paths
3. An output capacitor (COUT) should be placed as
close as possible to the IC. Connection to GND
should only be on top metal. Feedback signal
connection to VOUT should be routed away from
noisy components and traces (e.g. SW line)
(eq. 4)
The increased RMS current produces higher
through the RDS(ON) of the IC MOSFETs, as well
inductor DCR.
Increasing the inductor value produces lower
currents, but degrades transient response. For a
C OUT
ESR 2
)
D
(1 * D)
8
The 2.2 mF ceramic input capacitor should be placed as
close as possible between the VIN pin and GND to minimize
the parasitic inductance. If a long wire is used to bring power
to the IC, additional “bulk” capacitance (electrolytic or
tantalum) should be placed between CIN and the power
source lead to reduce the ringing that can occur between the
inductance of the power source leads and CIN.
The effective capacitance value decreases as VIN
increases due to DC bias effects.
The FAN53713 is optimized for operation with L =
1.0 mH, but is stable with inductances up to 1.3 H (nominal).
The inductor should be rated to maintain at least 80% of its
value at ILIM(PK).
Efficiency is affected by the inductor DCR and inductance
value. Decreasing the inductor value for a given physical
size typically decreases the DCR; but because DI increases,
the RMS current increases, as do the core and skin effect
losses.
I RMS +
f SW
2
Input Capacitor
(eq. 2)
The transition between PFM and PWM operation is
determined by the point at which the inductor valley current
crosses zero. The regulator DC current when the inductor
current crosses zero, IDCM, is:
I DCM +
ƪ
losses
as the
RMS
given
Table 9. EFFECTS OF CHANGES in Inductor Value (from 1.0 mH Recommended Value) on Regulator Performance
Inductor Value
IMAX(LOAD)
DVOUT
Transient Response
Increase
Increase
Decrease
Degraded
Decrease
Decrease
Increase
Improved
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FAN53713
Connect VIN pin and CIN using only top metal.
Connect COUT and GND pin only on top layer
Put as many as possible vias connected to
ground plane (Layer 2), to help dissipate heat.
Connect GND vias to system ground
VOUT trace should be as wide and as short
as possible, for low impedance, also should
be routed away from noisy components and
traces (e.g. SW line)
The ground area should be made as large as
possible to help dissipate heat
Figure 22. Top Layer
Layer 2 should be a solid ground layer, to
shield VOUT from capacitive coupling of the
fast edges of SW node.
Logic signals can be routed on this layer.
Figure 23. Layer 1
SW trace should be as wide and as short as
possible, and be isolated with GND area from
any other sensitive traces.
Figure 24. Layer 3
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FAN53713
PACKAGE DIMENSIONS
WLCSP6 1.38 0.94 0.625
CASE 567UH
ISSUE O
Table 10. PRODUCT−SPECIFIC DIMENSIONS
D
E
X
Y
1.380 ±0.030
0.940 ±0.030
0.270
0.290
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FAN53713
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