ON NCP3133AMNTXG Integrated synchronous buck converter Datasheet

NCP3133A
3 A Integrated Synchronous
Buck Converter
NCP3133A is a fully integrated synchronous buck converter for
3.3 V and 5 V step−down applications. It can provide up to 3 A load
current. NCP3133A supports high efficiency, fast transient response
and provides power good indicator. The control scheme includes two
operation modes: FCCM and automatic CCM/DCM. In automatic
CCM/DCM mode, the controller can smoothly switch between CCM
and DCM, where converter runs at reduced switching frequency with
much higher efficiency. NCP3133A is available in 3 mm x 3 mm
QFN−16 pin package.
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1
QFN16 3 x 3, 0.5P
CASE 485DA
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
High Efficiency in both CCM and DCM
High Operation Frequency at 1.1 MHz
Support MLCC Output Capacitor
Small Footprint, 3 mm x 3 mm, 16−pin QFN Package
Up to 3 A Continuous Output Current
2.9 V to 5.5 V Wide Conversion Voltage Range
Output Voltage Range from 0.6 V to 0.84 X Vin
Internal 400 ms Soft−Start
Automatic Power−Saving Mode
Voltage Mode Control
Support Pre-bias Start−up Functionality
Output Discharge Operation
Over−Temperature Protection
Built−in Over−Voltage, Under−Voltage and Over-Current Protection
Power Good Indicator
This is a Pb−Free Device
SUGGESTED PIN ARRANGEMENT
PGND PGND VIN VIN
16
14
13
EN
1
12 VDD
NC
2
11 AGND
PGD
3
10 FB
VBST
4
9
NCP3133A
5
6
7
8
SW
SW
SW
PS
COMP
MARKING DIAGRAM
3133A
ALYWG
G
Applications
• 5 V Step Down Rail
• 3.3 V Step Down Rail
15
3133A
A
L
Y
W
G
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
(*Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering, marking and shipping information in the
package dimensions section on page 12 of this data sheet.
© Semiconductor Components Industries, LLC, 2014
September, 2014 − Rev. 1
1
Publication Order Number:
NCP3133A/D
NCP3133A
VIN
VBST
UVLO
OSC
NC
Ramp
Control Logic
&
PWM Logic
PS
DRVH
SS
EN
SW
COMP
VREF
+
+ E/A
−
FB
DRVL
Power Good,
UVP, OVP, UVLO,
Overtemperature
and Vout discharge
PGD
PGND
OCP
UVLO
VDD
AGND
Figure 1. Block Diagram
Table 1. PIN DESCRIPTION
Pin No.
Symbol
Description
1
EN
Logic control to enabling the switcher. Internally pulled up to VDD with a 1.35 MW resistor
2
NC
Not connected
3
PGD
Open drain power good output
4
VBST
Gate drive voltage for high side FET. Connect capacitor from this pin to SW
5, 6, 7
SW
Switch node between high−side MOSFET and low−side MOSFET
8
PS
Mode configuration pin (with 10 mA current):
Pulled high or floating (internally pulled high): Forced Continuous Conduction Mode
Connect with resistor equal to or lower than (≤)174 kW to GND: Automatic CCM/DCM
9
COMP
10
FB
11
AGND
12
VDD
Power supply input for control circuitry
13, 14
VIN
Power input for power conversion and gate driver supply
15, 16
PGND
Output of the error amplifier
Feedback pin. Connect to resistor divider to set up the desired output voltage
Analog ground
Power ground
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2
NCP3133A
L1
Vin = 2.9 V X 5.5 V
C5
C6
R6
C4
13
VIN
12 VDD
C8
14
VIN
5
6
7
SW SW SW
C7
Vin
R7
VBST 4
11 AGND
C9
NCP3133A
2 NC
PGD 3
1 EN
FB 10
PGD
R3
EN
R5
Vout
C2
8 PS
PGND
15
PGND
16
C1
R4
R1
COMP 9
R2
C3
Figure 2. NCP3133A Single Voltage Rail for VIN and VDD
L1
Vin = 2.9 V X 5.5 V
C5
C6
C4
VDD = 3.3 V
13
VIN
12 VDD
14
VIN
5
6
7
SW SW SW
C8
C7
Vin
R7
VBST 4
11 AGND
C9
NCP3133A
2 NC
PGD 3
1 EN
FB 10
PGD
R3
EN
R5
Vout
C2
8 PS
PGND
15
PGND
16
C1
R4
R1
COMP 9
R2
C3
Figure 3. NCP3133A Dual Voltage Rail for VIN and VDD
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NCP3133A
Table 2. ABSOLUTE MAXIMUM RATINGS
Value
Min
Max
Units
VIN, VDD
−0.3
6.5
V
VBST
−0.3
17
VBST (with respect to SW)
−0.3
7
FB, PS, EN
−0.3
3.7
Rating
Input Voltage Range
Output Voltage Range
Symbol
SW
DC
−1
7
Pulse < 20 ns, E = 5 mJ
−3
10
PGD
−0.3
7
COMP
−0.3
3.7
PGND
−0.3
0.3
Operation ambient temperature
TA
−40
85
Storage temperature
TS
−55
150
Junction temperature
TJ
−40
150
Electrostatic Discharge
Human Body Model (HBM)
2000
Charged Device Model (CDM)
500
Lead temperature 1.6 mm (1/16 inch) from case for 10 seconds
V
°C
V
°C
300
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.
Table 3. RECOMMENDED OPERATION RATINGS
Value
Rating
Input Voltage Range
Output Voltage Range
Symbol
Min
Nom
Max
Units
V
VIN
2.9
5.5
VDD
2.9
5.5
VBST
−0.1
13.5
VBST (with respect to SW)
−0.1
6
EN
−0.1
3.5
FB, PS
−0.1
3.5
SW
−1
6.5
PGD
−0.1
6
COMP
−0.1
3.5
PGND
−0.1
0.1
−40
125
Junction temperature range, TJ
V
°C
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.
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NCP3133A
Table 4. ELECTRICAL CHARACTERISTICS
(VDD = VIN = 3.3 V and VDD = VIN = 5.0 V, over recommended free air temperature range, PGND = GND unless otherwise noted)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
5.5
V
POWER SUPPLY
VIN operation voltage
VIN
VIN UVLO threshold
Nominal input voltage range
2.9
Ramp up; EN = ‘HI’
VIN UVLO hysteresis
VDD internal bias voltage
Nominal 3.3 V input voltage range
VDD UVLO threshold
Ramp up; EN = ‘HI’
2.8
V
130
mV
2.9
VDD UVLO hysteresis
5.5
V
2.8
V
75
mV
VOLTAGE MONITOR
Pull−down voltage with 4 mA sink current
Power good low voltage
200
400
mV
−2.0
0
2.0
mA
Feedback lower voltage limit
80
83
86
%Vref
Feedback higher voltage limit
114
117
120
%Vref
Power good high leakage current
Power good threshold
Power good high delay
tPGDELAY
Minimum Vin voltage for valid PGD
at start up
Measured at Vin with 1 mA (or 2 mA) sink
current on PGD pin at start up
Output over-voltage protection
threshold at FB
Over-voltage blanking time
TOVPDLY
Time from FB higher than 20% of Vref to
OVP fault
Output under-voltage protection
threshold at FB
Under-voltage blanking time
TUVPDLY
400
ms
1
V
114
117
120
%Vref
1.0
1.7
2.5
ms
80
83
86
%Vref
Time from FB lower than 20% of Vref to
UVP fault
11
EN = ‘HI’, no switching
2.2
ms
SUPPLY CURRENT (TJ = +255C)
VDD quiescent current
IVDD
3.5
mA
VDD shutdown supply current
IVDD_SD
EN = ‘LO’
8.0
mA
Vin shutdown supply current
IQSHDN
EN = ‘LO’
3.5
mA
606
607.5
mV
FEEDBACK VOLTAGE & ERROR AMPLIFIER
Reference voltage at FB
VREF
0°C < TA < 85°C
−40°C < TA < 85°C
594
592.5
600
600
Unity gain bandwidth (Note 1)
14
MHz
Open loop gain (Note 1)
80
dB
FB pin leakage current
Output sourcing and sinking current
(Note 1)
100
Ccomp = 20 pF
Slew rate (Note 1)
nA
5
mA
5
V/ ms
OVER CURRENT PROTECTION & ZERO CROSSING
Over-current limit on high−side FET
When Iout exceeds this threshold for 4
consecutive cycles. Vin = 3.3 V, Vout =
1.5 V with 1 mH inductor, TA = +25°C
4.2
4.8
One time over-current latch off on
the low−side FET
Immediately shut down when sensed current reach this value. Vin = 3.3 V, Vout =
1.5 V with 1 mH inductor, TA = +25°C
4.8
5.4
Zero crossing comparator internal
offset (Note 1)
PGND−SWN, Automatic CCM/DCM mode
−4.5
−3.0
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5
5.4
A
A
−1.5
mV
NCP3133A
Table 4. ELECTRICAL CHARACTERISTICS
(VDD = VIN = 3.3 V and VDD = VIN = 5.0 V, over recommended free air temperature range, PGND = GND unless otherwise noted)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
1.1
1.18
1.30
V
EN hysteresis
0.18
0.24
V
EN input pull up resistor
1.35
MW
2.2
V
LOGIC PINS: I/O VOLTAGE AND CURRENT
EN high threshold voltage
PS mode threshold voltage
Level 1 to Level 2
PS source
10 mA pull−up current when enabled
8
10
12
mA
1
mA
INTERNAL BST DIODE
VBST = 6.6 V, Vin = 3.3 V, TA = 25°C
Reverse−bias leakage current
SOFT STOP
Output discharge on−resistance
EN = 0, VIN = 3.3 V, Vout = 0.5 V
20
W
Rising from Vss = 0 V to Vss = 0.6 V
0.4
ms
TIMERS: SOFT START
Soft start ramp−up time
TSS
Delay after EN asserting
EN = ‘HI’
Switching frequency control
Forced CCM mode
0.2
0.99
ms
1.1
1.21
MHz
100
140
ns
PWM
Minimum OFF time
FCCM mode or Automatic CCM/DCM mode
PWM ramp amplitude (Note1)
2.9 V < VIN < 0.6 V
Maximum duty cycle, FCCM mode
or Automatic CCM/DCM mode
FsW = 1.1 MHz, 0°C < TA < 85°C
VIN/4
84%
89%
130
140
V
THERMAL SHUTDOWN
Thermal shutdown threshold (Note 1)
Thermal shutdown hysteresis (Note 1)
40
150
°C
°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.
1. Guaranteed by design, no production test
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NCP3133A
TYPICAL CHARACTERISTICS
98
98
96
96
VOUT = 2.5 V
92
1.8 V
90
88
1.5 V
86
1.2 V
84
1.0 V
1.8 V
90
1.5 V
88
86
1.2 V
84
1.0 V
80
80
0
0.5
1.0
1.5
2.0
2.5
0
3.0
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
Figure 4. Efficiency at Auto CCM/DCM Mode
Vin = 3.3 V
Figure 5. Efficiency at Auto CCM/DCM Mode
Vin = 5.0 V
98
98
96
96
VOUT = 2.5 V
92
1.8 V
90
88
1.5 V
86
1.2 V
84
VOUT = 2.5 V
94
EFFICIENCY (%)
94
EFFICIENCY (%)
92
82
82
1.0 V
82
1.8 V
92
90
1.5 V
88
86
1.2 V
84
1.0 V
82
80
80
0
0.5
1.0
1.5
2.0
2.5
3.0
0
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
Figure 6. Efficiency at FCCM Mode Vin = 3.3 V
Figure 7. Efficiency at FCCM Mode Vin = 5.0 V
1.0
OUTPUT VOLTAGE CHANGE (%)
0.3
OUTPUT VOLTAGE CHANGE (%)
VOUT = 2.5 V
94
EFFICIENCY (%)
EFFICIENCY (%)
94
Vin = 3.3 V FCCM
0.2
Vin = 3.3 V Auto CCM/DCM
0.1
0
−0.1 Vin = 5 V FCCM
−0.2 Vin = 5 V Auto CCM/DCM
−0.3
0
0.5
1.0
1.5
2.0
2.5
3.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
1.5 V, 0 A, FCCM and Auto CCM/DCM
1.5 V, 3 A, FCCM
0.2
0.1 1.5 V, 3 A, Auto CCM/DCM
0
2.9
3.4
3.9
4.4
4.9
5.4
OUTPUT CURRENT (A)
INPUT VOLTAGE (V)
Figure 8. Load Regulation
(output current vs. output voltage)
Figure 9. Line Regulation
(input voltage vs. output voltage)
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5.9
NCP3133A
TYPICAL CHARACTERISTICS
10,000
SWITCHING FREQUENCY (kHz)
SWITCHING FREQUENCY (kHz)
10,000
FCCM
1000
Auto CCM/DCM
100
Vin = 3.3 V
10
FCCM
1000
Auto CCM/DCM
100
Vin = 5.0 V
10
0.01
0.1
1
10
0.01
0.1
1
10
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
Figure 10. Switching Frequency vs. Output
Current at Vin = 3.3 V
Figure 11. Switching Frequency vs. Output
Current at Vin = 5.0 V
EN
EN
Vout
Vout
PGD
PGD
Pre−bias = 0.5 V
Figure 12. Soft Start−up at Auto CCM/DCM
Mode Vin = 3.3 V, No Load
Figure 13. Pre−bias Start−up at Auto
CCM/DCM Mode Vin = 3.3 V, No Load
EN
Vout
PGD
Figure 14. Soft Stop at Auto CCM/DCM Mode
Vin = 3.3 V, No Load
Figure 15. Switching Node Waveform at Auto
CCM/DCM Mode Vin = 3.3 V, Full Load
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NCP3133A
TYPICAL CHARACTERISTICS
Figure 16. Switching Node Waveform at Auto
CCM/DCM Mode Vin = 3.3 V, No Load
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NCP3133A
DETAILED DESCRIPTION
Overview
NCP3133A provides two operation modes to fit various
application requirements. The automatic CCM/DCM mode
operation provides reduced power loss and increases the
efficiency at light load. The adaptive power control
architecture enables smooth transition between light load
and heavy load while maintaining fast response to load
transients.
NCP3133A is a low input voltage 3 A high performance
synchronous buck converter with two integrated
N−MOSFETs. NCP3133A’s output voltage range is from
0.6 V to 0.84 x Vin and it has wide input voltage range from
2.9 V to 5.5 V. The features of NCP3133A include
supporting pre−bias start−up to protect sensitive loads,
cycle−by−cycle over−current limiting and short circuit
protection, power good monitor, over voltage and under
voltage protection, built in output discharge and thermal
shutdown.
Operation Mode
NCP3133A offers two operation modes programmed by
PS pin connections, see table below.
Table 5.
PS pin Connection
Operation Mode
Auto Skip at Light Load
(≤)174 kW to GND
Automatic CCM/DCM
Yes
Floating or pulled to VDD
FCCM
Soft Stop
In forced continuous conduction mode (FCCM), the
high−side FET is ON during the on−time and the low−side
FET is ON during the off−time. The switching is
synchronized to an internal clock thus the switching
frequency is fixed.
In Automatic CCM/DCM mode, the high−side FET is ON
during the on−time and low−side FET is ON during the
off−time until the inductor current reaches zero. An internal
zero−crossing comparator detects the zero crossing of the
inductor current from positive to negative. When the
inductor current reaches zero, the comparator sends a signal
to the logic circuitry and turns off the low−side FET.
When the load is increased, the inductor current is always
positive and the zero−crossing comparator does not send any
zero−crossing signal. The converter enters into continuous
conduction mode (CCM) when no zero−crossing is detected
for two consecutive PWM pulses. In CCM mode, the
switching synchronizes to the internal clock and the
switching frequency is fixed.
Soft−Stop or discharge mode is always on during faults or
disable. In this mode, a fault (UVP, OCP) or disable (EN)
causes the output to be discharged through an internal 20 W
transistor inside of SW terminal. The time constant of
soft−stop is a function of output capacitance and the
resistance of the discharge transistor.
Automatic Power Saving Mode
In Automatic CCM/DCM mode when the load current
decreases, the converter will enter power saving mode
operation. During power saving mode, the low−side
MOSFET will turn off when the inductor current reaches
zero. So the converter skips switching and operates with
reduced frequency, which minimizes the quiescent current
and maintains high efficiency.
Forced Continuous Conduction Mode
When PS pin is floating or pulled high, NCP3133A is
operating in forced continuous conduction mode in both
light load and heavy load conditions. In this mode, the
switching frequency remains constant over the entire load
range, making it suitable for applications that need tight
regulation of switching frequency at a cost of lower
efficiency at light load.
Reference Voltage
The NCP3133A incorporates 600 mV reference voltage
with 1.0 % tolerance.
Internal Soft−Start
To limit the start−up inrush current, an internal soft start
circuit is used to ramp up the reference voltage from 0 V to
its final value linearly. The internal soft start time is 0.4 ms
typically.
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NCP3133A
PROTECTIONS
Under Voltage Lockout (UVLO)
low−side FET exceeds 5.1 A, the over−current protection is
enabled and immediately turns off both the high−side and
the low−side FETs. The device is fully protected against
over−current during both on−time and off−time. This
protection is latched.
There is under-voltage lock out protection (UVLO) for
both VIN and VDD in NCP3133A, which has a typical trip
threshold voltage 2.8 V and trip hysteresis 75 mV for VDD
and 130 mV for VIN. If UVLO is triggered, the device resets
and waits for the voltage to rise up over the threshold voltage
and restart the part. Please note this protection function
DOES NOT trigger the fault counter to latch off the part.
Pre−Bias Startup
In some applications the controller will be required to start
switching when its output capacitors are charged anywhere
from slightly above 0 V to just below the regulation voltage.
This situation occurs for a number of reasons: the
converter’s output capacitors may have residual charge on
them or the converter’s output may be held up by a low
current standby power supply. NCP3133A supports
pre−bias start up by holding low−side FETs off until soft
start ramp reaches the FB pin voltage.
Over Voltage Protection (OVP)
When feedback voltage is above 17% (typical) of nominal
voltage for over 1.7 ms blanking time, an OV fault is set. In
this case, the converter de−asserts the PGD signal and
performs the over−voltage protection function. The top gate
drive is turned off and the bottom gate drive is turned on to
discharge the output. The bottom gate drive will be turned
off until VFB drops below the UVP threshold. The device
enters a high−impedance state. This protection is latched.
Thermal Shutdown
The NCP3133A protects itself from over heating with an
internal thermal monitoring circuit. When the die
temperature goes beyond a threshold value 135°C, both the
high−side and the low−side FETs turn off until the
temperature falls 40°C below of the threshold value. Then
the converter restarts.
Under Voltage Protection (UVP)
Output under−voltage protection works in conjunction
with the current protection described in the Over−current
Protection sections. An UVP circuit monitors the feedback
voltage to detect under−voltage event. The under−voltage
limit is 17% (typical) below of nominal voltage at FB pin.
If the feedback voltage is below this threshold over 11 ms, an
UV fault is set and both the high−side and the low−side FETs
turn off. This protection is latched.
Application Note
For higher output voltage application cases (Vout =
3.3 V), choose the inductor value not to be lower than 1 mH
to avoid over-current protection being triggered by inductor
current ripple; for higher output voltage application cases
(Vout = 3.3 V), if the input power supply slew rate is too
slow, consider to add a RC filter (100k and 1 mF) at EN pin
to avoid any latch issue during the start up.
Power Good Monitor (PGD)
NCP3133A provides window comparator to monitor the
output voltage at FB pin. When the output voltage is within
±17% of regulation voltage, the power good pin outputs a
high signal. Otherwise, PGD stays low. The PGD pin is open
drain 5 mA pull down output. During startup, PGD stays low
until the feedback voltage is within the specified range for
about 0.4 ms. If feedback voltage falls outside the tolerance
band, the PG pin goes low after 10 ms delay.
The PGD pin de−asserts as soon as the EN pin is pulled
low or an under−voltage event on VDD is detected.
Layout Guidelines
When laying out a power PCB for the NCP3133A there
are several key points to consider.
Use four vias to connect the thermal pad to power ground.
Separate the power ground and analog ground planes;
connect them together at a single point.
Increase the thickness of PCB copper, it can help to lower
the die temperature and improve the overall efficiency but
meanwhile increase the cost of the board fabrication.
Use wide traces for the nodes conducting high current
such as VIN, VOUT, PGND and SW.
Place feedback and compensation network components
close to the IC.
Keep FB, COMP away from noisy signals such as SW,
BST.
Place VIN and VDD decoupling capacitors as close to the
IC as possible.
Over Current Protection (OCP)
NCP3133A provides both high−side and low−side
MOSFET current limiting. When the current through the
high−side FET exceeds 4.8 A, the high−side FET turns off
and the low−side FET turns on until next PWM cycle. An
over−current counter is triggered and starts to increment
each occurrence of an over−current event. Both the
high−side and the low−side FETs turn off when the OC
counter reaches four. The OC counter resets if the detected
current is less than 4.8 A after an OC event.
Another set of over−current circuitry monitors the current
flowing through the low−side FET. If the current through the
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NCP3133A
ORDERING INFORMATION
Device
NCP3133AMNTXG
Marking
Package
Shipping†
3133A
QFN16, 3 x 3, 0.5P
(Pb−Free)
3000 / Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
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NCP3133A
PACKAGE DIMENSIONS
QFN16 3x3, 0.5P
CASE 485DA
ISSUE O
A
D
PIN ONE
REFERENCE
ÇÇÇÇ
ÇÇÇÇ
ÇÇÇÇ
B
L
L
L1
DETAIL A
E
ALTERNATE
CONSTRUCTIONS
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ASME Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. DIMENSION b APPLIES TO PLATED
TERMINAL AND IS MEASURED BETWEEN
0.15 AND 0.30 MM FROM THE TERMINAL TIP.
4. COPLANARITY APPLIES TO THE EXPOSED
PAD AS WELL AS THE TERMINALS.
DIM
A
A1
A3
b
D
D2
E
E2
e
K
L
L1
L2
0.10 C
2X
0.10 C
2X
ÇÇÇ
ÉÉÉ
ÉÉÉ
EXPOSED Cu
TOP VIEW
A
DETAIL B
0.05 C
MOLD CMPD
DETAIL B
A3
ALTERNATE
CONSTRUCTION
0.05 C
NOTE 4
SIDE VIEW
A1
C
SEATING
PLANE
MILLIMETERS
MIN
MAX
0.80
1.00
0.00
0.05
0.20 REF
0.20
0.30
3.00 BSC
1.55
1.75
3.00 BSC
1.55
1.75
0.50 BSC
0.275 REF
0.30
0.50
0.00
0.15
0.09 REF
0.10 C A B
RECOMMENDED
SOLDERING FOOTPRINT*
D2
DETAIL A
16X
5
L
8X
L2
3.30
16X
0.10 C A B
0.61
PACKAGE
OUTLINE
9
E2
16X
1
b
0.10 C A B
0.05 C
K
1.78
1
NOTE 3
1.78 3.30
16
e
e/2
BOTTOM VIEW
16X
0.30
0.50
PITCH
DIMENSIONS: MILLIMETERS
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
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