10A

Technical
Specification
NQ04W33SKA10
2.4-6.0V
Input
0.75-3.6V
Outputs
10 Amp
Current
Non
Isolated
SMT
Surface Mount
The NiQor® SMT DC/DC converter is a non-isolated buck
regulator which employs synchronous rectification to achieve
extremely high conversion efficiency. The NiQor family of
Non-Isolated
converters is used predominately in DPA systems using a
front end DC/DC high power brick (48Vin to low voltage
bus). These non-isolated converters are then used at the
point of load to create the low voltage outputs required by
the design. The wide trim module can be programmed to a
variety of output voltages through the use of a single external
resistor. RoHS compliant (see page 12).
NQ04W33SKA10 wide trim module
Operational Features
• Ultra high efficiency, up to 95% at full rated load
• Delivers up to 10 Amps of output current with minimal
derating - no heatsink required
• Input Voltage Range : 2.4 - 6.0V
• Programmable output voltages from 0.75 - 3.6V
• On-board input and output filter capacitor
• No minimum load requirement means no preload resistors required
Mechanical Features
• DOSA standard SMT pin-out configuration
•Industry standard size: 1.3” x 0.53” x 0.29” (33 x
13.5 x 7.3 mm)
•Available in SIP configuration
•Total weight: 0.18 oz. (5 grams), lower mass greatly reduces vibration and shock problems
•Open frame construction maximizes air flow cooling
Control Features
• On/Off control
• Output voltage trim (industry standard) permits custom
voltages and voltage margining
• Remote Sense (standard option)
Product # NQ04W33SKA10
Phone 1-888-567-9596
Protection Features
• Input under-voltage lockout disables converter at low
input voltage conditions
• Temperature compensated over-current shutdown protects converter from excessive load current or short circuits
• Output over-voltage protection protects load from damaging voltages
• Thermal shutdown protects converter from abnormal
environmental conditions
Safety Features
• UL/cUL 60950-1 recognized (US & Canada)
• TUV certified to EN60950-1
• Meets 72/23/EEC and 93/68/EEC directives which
facilitates CE Marking in user’s end product
• Board and plastic components meet UL94V-0 flammability requirements
www.synqor.com
Doc.# 005-2NK4S3E Rev. D
08/25/2011
Page 1
Input:
Outputs:
Current:
Package:
Technical Specification
2.4 - 6.0V
0.75 - 3.6V
10A
SMT
MECHANICAL
DIAGRAM
Surface Mount Package
0.288+.018
1.30
(7.32+0.45)
(33.0)
see Note 4
0.025
(0.64)
2
3
4
5
0.075
(1.91)
0.063
(1.60)
0.405
(10.29)
Typ.
7
6
0.012+.007
(0.3+0.17)
Bottomside
Clearance
0.297
(7.54)
0.100
(2.54)
0.487
0.048
(12.37)
(1.22)
0.063
(1.6)
0.677
Typ.
(17.20)
Side View
0.867
(22.02)
1.057
(26.85)
1.177
(29.90)
Recommended SMT Pad Size:
Minimum: 0.074” x 0.122” (1.88mm x 3.1mm)
Maximum: 0.095” x 0.140” (2.41mm x 3.56mm)
Bottom View
NOTES
SMT CONTACT DESIGNATIONS
1) SMT Contacts: Material - Brass
Finish - Gold over Nickel plate
2) Undimensioned components are shown for visual
reference only.
3) All dimensions in inches (mm)
Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
4) Coplanarity for pins 1-7 is 0.004” max
5) Weight: 0.18 oz. (5 g) typical
6) Workmanship: Meets or exceeds IPC-A-610C Class II
Product # NQ04W33SKA10
Phone 1-888-567-9596
Pin No. Name
Function
2
GND
Ground
3
Vout(+)
Positive output voltage
4
TRIM
Output Voltage Trim
5
SENSE(+)
Positive remote sense
6
Vin(+)
Positive input voltage
7
ON/OFF
Input to turn converter on/off
Pins in Italics Shaded text are Optional
www.synqor.com
Doc.# 005-2NK4S3E Rev. D
08/25/2011
Page 2
Input:
Outputs:
Current:
Package:
Technical Specification
2.4 - 6.0V
0.75 - 3.6V
10A
SMT
ELECTRICAL CHARACTERISTICS - NQ04W33SKA10 Series
Vin=3.3Vdc and 5.0Vdc except 3.3Vout units where Vin=5.0V; TA=25°C, airflow rate=300 LFM unless otherwise noted; full operating temperature range is -40°C to +105°C ambient temp with appropriate power derating. Specifications subject to change without notice.
Parameter
Module
Min.
Typ.
Max.
All
All
All
All
All
0
-40
-55
-3
7
6
105
125
6
V
V
°C
°C
V
All
All
All
All
All
2.4
100
0.75
0
6
20
3.6
10
V
A
µF
V
A
All
All
All
0.75V
2.5V
3.3V
0.75V
2.5V
3.3V
All
All
All
0.75V
2.5V
3.3V
2.07
1.92
2.21
2.01
0.2
106
119
124
10
30
37\11
70\21
60\18
2.35
2.10
4.36
8.15
10.16
0.1
V
V
V
A
A
A
mA
mA
mA
mA
A2s
µF
mA
mA
mA
0.75V
All
All
0.745
0.75
0
0.750
0.755
3.60
10
V
V
A
All
All
All
All
0.75V
2.5V
3.3V
All
All
12
100
22.4\6.0
33.2\10.3
30.8\8.5
19
0.5
0.7
1
3
24
5000
%
%
%
%
mV
mV
mV
A
µF
With sense pin
“
“
With sense pin, over sample, line, load, temp. & life
Full load; 20MHz bandwidth; Figures 13 & 16
“
“
All
45
dB
120Hz; Figure 18
All
All
All
All
All
All
2
2
100
100
100
6
6
0
mV
mV
µs
ms
ms
V
50%-75%-50% Iout max; 100uF; Figure 11
50%-75%-50% Iout max; 470uF; Figure 11
To within 1.5% Vout nom.; Figures 11 & 12
Figures 9 & 10
Resistive load
“
“
All
All
125
125
°C
°C
Package rated to 150°C; Figures 3 - 8
UL rated max operating temp 130°C
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
Operating
Operating Temperature
Storage Temperature
Voltage at ON/OFF input pin
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
Input Fuse Rating
External Input Capacitance
Output Voltage
Output Current
INPUT CHARACTERISTICS
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Hysteresis
Maximum Input Current
“
“
No-Load Input Current
“
“
Disabled Input Current
Inrush Current Transient Rating
Input Filter Capacitor Value
Input Reflected-Ripple Current (pk-pk\RMS)
“
“
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Range
Operating Output Current Range
Output Voltage Regulation
Over Line
Over Load
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise (pk-pk\RMS)
“
“
Output DC Over Current Shutdown
External Output Capacitance
DYNAMIC CHARACTERISTICS
Input Voltage Ripple Rejection
Output Voltage during Current Transient
For a Step Change in Output Current (0.1A/µs)
For a Step Change in Output Current (3A/µs)
Settling Time
Turn on Transient
Inhibit Time
Rise Time
Output Voltage Overshoot
TEMP LIMITS FOR POWER DERATING
Semiconductor Junction Temperature
Board Temperature
Product # NQ04W33SKA10
Phone 1-888-567-9596
www.synqor.com
Units Notes & Conditions
Continuous
Continuous
Fast blow external fuse recommended
ESR<1.5W
2.4Vin; 100% load
3.6Vin; 100% load
3.6Vin; 100% load
5Vin
“
“
With min. output capacitance
5Vin; 100% load
5Vin 50% load
>0.5mohm
Doc.# 005-2NK4S3E Rev. D
08/25/2011
Page 3
Input:
Outputs:
Current:
Package:
Technical Specification
2.4 - 6.0V
0.75 - 3.6V
10A
SMT
ELECTRICAL CHARACTERISTICS (continued) - NQ04W33SKA10 Series
Parameter
Module
EFFICIENCY
100% Load
0.75V
“
1.8V
“
3.3V
50% Load
0.75V
“
1.8V
“
3.3V
FEATURE CHARACTERISTICS
Switching Frequency
All
Open Logic (O) ON/OFF Control
Off-State Voltage
All
On-State Voltage
All
Input Resistance
All
Positive Logic (P) ON/OFF Control
Logic Low Voltage Range
All
Logic High Voltage Range (internal pullup)
All
Logic Low sink current
All
Logic High sink current (leakage)
All
Output Voltage Trim Range
All
Output Over-Voltage Protection
All
Over-Temperature Shutdown
All
Over-Temperature Shutdown Restart Hysteresis
All
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia)
All
Calculated MTBF (MIL-217)
All
Field Demonstrated MTBF
All
Min.
Typ.
Max.
83.0
91.0
95.0
84.0
91.0
95.0
275
300
325
1.5
6.5
-3
0.6
20
-0.2
1
2.2
50
100
0.75
3.6
3.9
4.2
4.6
128
10
15.6
15.6
Units Notes & Conditions
%
%
%
%
%
%
kHz
V
V
kW
V
V
µA
µA
V
V
°C
°C
Figures 1 & 2
“
“
“
“
“
Figure A
Open collector/drain input; Figure A
Measured Vout+ to common pins; Table 1
Over full temp range
Average PCB Temperature
106 Hrs. TR-NWT-000332; 100% load, 200LFM, 40oC Ta
106 Hrs. MIL-HDBK-217F; 100% load, 200LFM, 40oC Ta
106 Hrs. See our website for details
STANDARDS COMPLIANCE
Parameter P
Notes
File # E194341
Certified by TUV
STANDARDS COMPLIANCE
UL/cUL 60950-1 EN60950-1 72/23/EEC
93/68/EEC
Needle Flame Test (IEC 695-2-2)
IEC 61000-4-2
GR-1089-CORE
Telcordia (Bellcore) GR-513
Test on entire assembly; board & plastic components UL94V-0 compliant
ESD test, 8kV - NP, 15kV air - NP (Normal Performance)
Section 7 - electrical safety, Section 9 - bonding/grounding
• An external input fuse must always be used to meet these safety requirements. Contact SynQor for official safety
certificates on new releases or download from the SynQor website.
QUALIFICATION TESTING
Parameter P
QUALIFICATION TESTING
Life Test
Vibration
Mechanical Shock
Temperature Cycling
Power/Thermal Cycling
Design Marginality
Humidity
Solderability
# Units
32
5
5
10
5
5
5
15 pins
Test Conditions
95% rated Vin and load, units at derating point, 1000 hours
10-55Hz sweep, 0.060” total excursion,1 min./sweep, 120 sweeps for 3 axis
100g minimum, 2 drops in x and y axis, 1 drop in z axis
-40°C to 100°C, unit temp. ramp 15°C/min., 500 cycles
Toperating = min to max, Vin = min to max, full load, 100 cycles
Tmin-10°C to Tmax+10°C, 5°C steps, Vin = min to max, 0-105% load
85°C, 85% RH, 1000 hours, continuous Vin applied except 5min./day
MIL-STD-883, method 2003
• Extensive characterization testing of all SynQor products and manufacturing processes is performed to ensure that we supply
robust, reliable product. Contact the factory for official product family qualification documents.
OPTIONS
SynQor provides various options for Packaging, Enable Logic,
and Feature Set for this family of DC/DC converters. Please consult the last page for information on available options.
Product # NQ04W33SKA10
Phone 1-888-567-9596
PATENTS
SynQor is protected under various patents. Please consult the
last page for further details.
www.synqor.com
Doc.# 005-2NK4S3E Rev. D
08/25/2011
Page 4
Input:
Outputs:
Current:
Package:
Technical Specification
100
2.0
Power Dissipation (W)
95
Efficiency (%)
2.4 - 6.0V
0.75 - 3.6V
10A
SMT
90
85
80
75
3.3Vo
70
1.8Vo
0
1
2
3
4
5
6
7
8
9
1.2
0.8
3.3Vo
0.4
1.8Vo
0.75Vo
0.75Vo
65
1.6
0.0
0
10
Load Current (A)
1
2
3
4
5
6
7
8
9
10
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for
nominal input voltage at 25°C.
Figure 2: Power dissipation at nominal output voltage vs. load current
for nominal input voltage at 25°C.
12.0
10.0
Iout (A)
8.0
6.0
100 LMF (0.5m/s)
4.0
200 LMF (1.0m/s)
300 LMF (1.5m/s)
2.0
400 LMF (2.0m/s)
6 layers 2oz cu board
Semiconductor junction temperature is
within 1°C of surface temperature
25
40
55
70
85
Ambient Air Temperature (°C)
Figure 3: Maximum output power derating curves for 0.75Vo, 1.2Vo
units under various thermal conditions and nominal input voltage. See
Thermal Considerations section for more details.
Figure 4: Thermal plot of 0.75Vo, 1.2Vo converters at nominal Vin and
10 amp load current mounted on a 85°C, 6-Layer, 2 oz. copper board
(typical installation).
12.0
10.0
Iout (A)
8.0
6.0
100 LMF (0.5m/s)
4.0
200 LMF (1.0m/s)
300 LMF (1.5m/s)
2.0
400 LMF (2.0m/s)
6 layers 2oz cu board
25
40
55
70
Semiconductor junction temperature is
within 1°C of surface temperature
85
Ambient Air Temperature (°C)
Figure 5: Maximum output power derating curves for 1.5Vo, 1.8Vo
units under various thermal conditions and nominal input voltage. See
Thermal Considerations section for more details.
Product # NQ04W33SKA10
Phone 1-888-567-9596
Figure 6: Thermal plot of 1.5Vo, 1.8Vo converters at nominal Vin and
10 amp load current mounted on a 85°C, 6-Layer, 2 oz. copper board
(typical installation).
www.synqor.com
Doc.# 005-2NK4S3E Rev. D
08/25/2011
Page 5
Input:
Outputs:
Current:
Package:
Technical Specification
2.4 - 6.0V
0.75 - 3.6V
10A
SMT
12.0
10.0
Iout (A)
8.0
6.0
100 LMF (0.5m/s)
4.0
200 LMF (1.0m/s)
300 LMF (1.5m/s)
2.0
400 LMF (2.0m/s)
6 layers 2oz cu board
Semiconductor junction temperature is
within 1°C of surface temperature
25
40
55
70
85
Ambient Air Temperature (°C)
Figure 7: Maximum output power derating curves for 2.5Vo, 3.3Vo
units under various thermal conditions and nominal input voltage. See
Thermal Considerations section for more details.
Figure 8: Thermal plot of 2.5Vo, 3.3Vo converters at nominal Vin and
10 amp load current mounted on a 85°C, 6-Layer, 2 oz. copper board
(typical installation).
3.3Vout
3.3Vout
2.5Vout
2.5Vout
on/off
on/off
Figure 9: Turn-on transient at full load (resistive load) (2 ms/div).
Ch 1: ON/OFF input (5V/div)
Ch 2-4: Vout (1V/div)
Figure 10: Turn-on transient at zero load (2 ms/div).
Ch 1: ON/OFF input (5V/div)
Ch 2-4: Vout (1V/div)
2.5Vout
2.5Vout
3.3Vout
3.3Vout
Iout
Iout
Figure 11: Output voltage response for 0.75V, 2.5V, 3.3V units to stepchange in load current (50-75-50% of Iout max; di/dt=0.1A/µs). Load cap:
100µF, 100mW ESR tant, 10µF cer. Ch 1: Iout (10A/div), Ch 2-4: Vout
Product # NQ04W33SKA10
Phone 1-888-567-9596
Figure 12: Output voltage response for 0.75V, 2.5V, 3.3V units to step-change
in load current (50-75-50% of Iout max; di/dt=3A/µs). Load cap: 470µF,
100mW ESR tant, 10µF cer. Ch 1: Iout (10A/div), Ch 2-4: Vout (200mV/div).
www.synqor.com
Doc.# 005-2NK4S3E Rev. D
08/25/2011
Page 6
Input:
Outputs:
Current:
Package:
Technical Specification
2.4 - 6.0V
0.75 - 3.6V
10A
SMT
See Fig. 14
1 µH
source
impedance
See Fig. 15
See Fig. 16
iS
VSOURCE
VIN
DC/DC
Converter
VOUT
22 µF
2.5Vout
100 µF
100mW ESR
3.3Vout
Figure 13: Test set-up diagram showing measurement points for Input
Reflected Ripple Current (Figure 14), Input Terminal Ripple Voltage
(Figure 15), and Output Voltage Ripple (Figure 16).
Figure 14: Input Reflected Ripple Current, is, through a 1 µH source
inductor at nominal input voltage and rated load current (100 mA/div).
See Figure 13.
2.5Vout
2.5Vout
3.3Vout
3.3Vout
C*
ceramic
capacitor
tantalum
capacitor
* See values for recommended external input capacitance.
Inductor optional as needed.
Figure 15: Input Terminal Ripple Voltage at nominal input voltage and
rated load current (200 mV/div). Load capacitance: 22µF ceramic cap
and 100µF tantalum cap. Bandwidth: 20 MHz. See Figure 13.
Figure 16: Output Voltage Ripple at nominal input voltage and rated
load current (20 mV/div). Load capacitance: 22µF ceramic cap and
100µF tantalum cap.. Bandwidth: 20 MHz. See Figure 13.
Figure 17: Magnitude of incremental output impedance (Zout = vout/
iout) for nominal input voltage at full rated power with 100µF tantalum
output capacitor.
Figure 18: Magnitude of incremental forward transmission (FT = vout/
vin) for nominal input voltage at full rated power with 100µF tantalum
output capacitor.
Product # NQ04W33SKA10
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2NK4S3E Rev. D
08/25/2011
Page 7
Input:
Outputs:
Current:
Package:
Technical Specification
Figure 19: Magnitude of incremental reverse transmission (RT = iin/
iout) for nominal input voltage at full rated power with 100µF tantalum
output capacitor.
Product # NQ04W33SKA10
Phone 1-888-567-9596
2.4 - 6.0V
0.75 - 3.6V
10A
SMT
Figure 20: Magnitude of incremental input impedance (Zin = vin/iin)
for nominal input voltage at full rated power with 100µF tantalum output capacitor.
www.synqor.com
Doc.# 005-2NK4S3E Rev. D
08/25/2011
Page 8
Input:
Outputs:
Current:
Package:
Technical Specification
BASIC OPERATION AND FEATURES
The NiQor series non-isolated converter uses a buck-converter
that keeps the output voltage constant over variations in line,
load, and temperature. The NiQor modules employ synchronous
rectification for very high efficiency.
For a desired increase of the nominal output voltage, the value of
the resistor should be:
Rtrim-up =
Option
Description
Pin-Open
Float
Voltage
Pin-Open
Converter
State
Pin Action
P Logic
Positive/Open
5V
On
Pull Low=Off
O Logic
Negative/Open
0V
On
Pull High=Off
OUTPUT VOLTAGE TRIM: The TRIM input permits the user to
adjust the output voltage according to the trim range specifications by using an external resistor. If the TRIM feature is not being
used, leave the TRIM pin disconnected.
TRIM-UP: To increase the output voltage from the nominal setpoint of 0.7525V using an external resistor, connect the resistor
Rtrim-up between the TRIM and the Ground pin according to the
diagram below.
On/Off
Gnd
_ 5110 (W)
where
21070
Rtrim-up + 5110
(W)
VDES = Desired Output Voltage
To maintain the accuracy of the output voltage over load current,
it is vital that any trim-up resistor be terminated directly to the
converter’s ground foot, not at the connection to the load. A
separate Kelvin connection to the PCB pad for the ground foot
is optimal. Trim-down resistors should be terminated at the converter’s Sense+ pin.
We do not recommend bypassing the trim pin directly to ground
with a capacitor. The voltage gain from the trim pin to output
is rather large, 15:1. Ground bounce through a bypass capacitor could introduce significant noise to the converter’s control
circuit.
PROTECTION FEATURES
Input Under-Voltage Lockout: The converter is designed to
turn off when the input voltage is too low, helping avoid an input
system instability problem, described in more detail in the application note titled “Input System Instability”. The lockout circuitry
is a comparator with DC hysteresis. When the input voltage is
rising, it must exceed the typical Turn-On Voltage Threshold value
(listed on the specification page) before the converter will turn
on. Once the converter is on, the input voltage must fall below
the typical Turn-Off Voltage Threshold value before the converter
will turn off.
Output Current Limiting: To provide protection in an output
over load fault condition, the unit is equipped with internal overcurrent protection. When the over-current protection is triggered,
the unit enters hiccup mode. The units operate normally once the
fault condition is removed.
Vout
Sense+
Vin
VDES - 0.7525
VOUT = 0.7525 +
The NiQor series of SIPs and SMT converters uses the established
industry standard footprint and pin-out configurations.
REMOTE ON/OFF: The ON/OFF input permits the user to
control when the converter is on or off. There are currently two
options available for the ON/OFF input described in the table
below. Others may become available if demand exists.
21070
or
Dissipation throughout the converter is so low that it does not
require a heatsink or metal baseplate for operation. The NiQor
converter can thus be built more simply and reliably using high
yield surface mount techniques on a single PCB substrate.
CONTROL FEATURES
2.4 - 6.0V
0.75 - 3.6V
10A
SMT
Trim
Rtrim-up
Internal Over-Voltage Protection: To fully protect from
excessive output voltage, the NQ04 series contains an Output
Over-Voltage Shutdown circuitry.
This OVP is independent of the trimmed setpoint. As such, the
converter’s load is protected from faults in the external trim circuitry (such as a trim pin shorted to ground). Since the setpoint
of this OVP does not track trim, it is set at 4.2V, in the wide-trim
W33 model.
Product # NQ04W33SKA10
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2NK4S3E Rev. D
08/25/2011
Page 9
Input:
Outputs:
Current:
Package:
Technical Specification
The shutdown point is fixed on standard option. SKA also offers
adjustable OVP set point. For more detailed information contact
SynQor technical support.
Over-Temperature Shutdown: A temperature sensor on the
converter senses the average temperature of the module. The
thermal shutdown circuit is designed to turn the converter off
when the temperature at the sensed location reaches the OverTemperature Shutdown value. It will allow the converter to turn
on again when the temperature of the sensed location falls by
the amount of the Over-Temperature Shutdown Restart Hysteresis
value.
APPLICATION CONSIDERATIONS
Input Filtering/Capacitance/Damping: The filter circuit of
Figure E is often added to the converter’s input to prevent switching noise from reaching the input voltage bus.
2.4 - 6.0V
0.75 - 3.6V
10A
SMT
output of the SKA10 series of converters. The VKA10 series has
this capacitance included internally. In many applications, however, additional external output capacitance is required to reduce
the response to load transients to an allowable level.
The output impedance of these converters can be quite
accurately modeled
from DC to about
100kHz as shown in
Figure F. A further
simplified version of it,
valid below 40Hz and
above 1kHz, is shown
in Figure G. In the
SKA10 case, the models depict the minimum
Figure F: NQ04 Passive Output Model recommended output
capacitance, Ct with
its resistance Rt. In the VMA10 family, that capacitor is again
included in the converter.
If the dynamic characteristics of the load
are known, any standard simulator can
use these models to
predict the in-circuit
transient response.
Figure E: NQ04 converter with Input Filter
In the SKA10 (surface mount) converters Cin = 30µF of high
quality ceramic capacitors. With Lin of 1µH, Cd should be
100-200µF and Rd should be 0.1-0.2W, in most applications. For more information on designing the input filter and choosing
proper values, contact SynQor technical support.
Adding significant external pure ceramic capacitance directly
across the converter’s input pins is not recommended. Parasitic
inductance associated with the input pin geometry and PCB
traces can create a high-Q CLC circuit with any external capacitors. Just a few nano-Henries of parasitic inductance can create
a resonance (or an overtone) near the converter’s switching
frequency. Cin has a reactance of 10-20mW at the 300kHz
switching frequency. To avoid this high-frequency resonance,
any external input filter should exhibit a net source impedance
of at least 20mW resistive through this frequency range. This
requirement is easily met with the damping elements discussed
above. Adding a small amount (a few µF) of high-frequency
external ceramic will not violate it.
If using converters at higher powers, consider the ripple current
rating of Cd. Contact SynQor technical support for details.
Output Capacitance: It is recommended to add at least
100µF of capacitance, with an ESR in the 0.1W range, to the
Product # NQ04W33SKA10
Phone 1-888-567-9596
Figure G: Simplified NQ04 Output Model
Figure H: Converter with Additional Output Capacitance
For minimal overshoot upon recovery, Cd should be related to the
minimum in-circuit net ESR.
parallel (L1, L2)
Cd >
ESRdmin2
For more detailed derivations of these values contact SynQor
technical support.
www.synqor.com
Doc.# 005-2NK4S3E Rev. D
08/25/2011
Page 10
Input:
Outputs:
Current:
Package:
Technical Specification
Thermal Performance (SKA10): While impossible to be
exact, a simplified thermal model for the mounted converter is
detailed below.
Figure I: Thermal Model for NQ04 Surface Mount
• Rt_J-Pcb models the conduction of heat from the converter’s
hottest junction to the converter’s PCB at large. It is about
3oC/W for converters running at higher output voltage, and
about 4oC/W for lower voltage converters. • Rt_Pcb-Amb models the power dissipation from converter PCB
to the air stream. It ranges from about 15oC/W at 400LFM to
about 25oC/W 100LFM. 2.4 - 6.0V
0.75 - 3.6V
10A
SMT
SURFACE MOUNT INFORMATION
PCB Layout Considerations: SynQor recommends that
the customer use a non-solder mask defined pad design. The
minimum recommended pad size is 0.074” x 0.122” (1.88mm
x 3.1mm) and the maximum pad size is 0.095” x 0.140”
(2.41mm x 3.56mm), see the mechanical diagram on page 2. Interconnection to internal power planes is typically required. This can be accomplished by placing a number of vias between
the SMT pad and the relevant plane. The number and location
of the vias should be determined based on electrical resistance,
current and thermal requirements. “Via-in-pad” design should be
avoided in the SMT pads. Solder mask should be used to eliminate solder wicking into the vias.
Pick and Place: The NiQor surface mount modules are
designed for automated assembly using standard SMT pick and
place equipment. The modules have a centrally located inductor
component with a flat surface area to be used for component
pick-up. The units use open frame construction and have a low
mass that is within the capability of standard pick and place
equipment. Those modules however have a larger mass than
most conventional SMT components and so variables such as
nozzle size, tip style, handling speed, and placement pressure
should be optimized for best results. A conformal tipped placement nozzle design is recommended. Coplanarity of better than
0.004” (0.1mm) is achieved through the SMT NiQor’s terminal
design.
• Rt_Pcb-Feet expresses the thermal path from the converter’s PCB
though its mounting feet; it is about 3oC/W.
• Rt_spread models the heat spreading on the PCB to which the
converter is mounted and is largely dependent upon the construction and layout of that PCB.
• T_mount is the temperature of that PCB in the greater vicinity of
the converter.
As is evident, the values for Rt_spread and T_mount will have
great effect upon the thermal operation of the converter. With
Rt_Pcb-Amb being 5 to 8 times as large as Rt_Pcb-Feet, in most
applications these converters will be predominantly cooled via
thermal conduction through their feet. Airflow and T_Amb will
have only a minimal cooling effect.
• Rt_spread should be minimized. Attach the converter to large
copper planes, on multiple layers, with multiple vias near the
mounting feet.
• T_mount should also be minimized. Place the converter far
enough away from other sources of heat on the PCB so that it
is as cool as practical.
• If operation near derating limits is even suspected, thermal
performance should be verified with the unit mounted in its
intended manner and powered in circuit with all neighboring circuitry active. Attach a thermocouple to the converter’s
hotspot as shown in Figures 4, 6, and 8 in the Performance
Curves section.
Product # NQ04W33SKA10
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2NK4S3E Rev. D
08/25/2011
Page 11
Input:
Outputs:
Current:
Package:
Technical Specification
Reflow Soldering Guidelines: Figure J
shows a typical reflow profile for a eutectic
solder process. Due to variations in customer
applications, materials and processes, it is not
feasible for SynQor to recommend a specific
reflow profile. The customer should use this
profile as a guideline only. Since the NiQor surface mount modules have a larger thermal mass
and lower thermal resistance than standard SMT
components, it may be necessary to optimize
the solder reflow profile based on limitations of
the other components on the customer board.
Sufficient reflow time must be allowed to fuse the
plating on the connection to ensure a reliable
solder joint. The solder reflow profile should
be confirmed by accurately measuring the SMT
interconnect leads. Maximum case temperature
of 260°C (exposure for 5 seconds or less) is not
exceeded for the NiQor units.
Maximum Temperature (+210-260oC)
Eutectic Solder Melting Point (+183oC)
(+150-155oC)
Pre-heat
•
Reflow
Soak
< 2.5oC/sec
Cool Down
•
0.5-0.6oC/sec
•
1.3-1.6oC/sec
•
60 to 90 sec.,
typ., 2 min max
•
30 to 60 sec., typ.,
90 sec max
2 to 4 min.
Figure J: Typical Eutectic (96.5Sn/3.0Ag/0.5Cu) Solder Profile
Moisture Sensitivity: The NiQor surface mount modules have
an MSL rating 1 per IPC/JEDEC J-STD-033A.
Cleaning and Drying: When possible, a no-clean solder
paste system should be used to solder the NiQor SMT units to
their application board. The modules are suitable for aqueous washing, however, the user must ensure sufficient drying
to remove all water from the converter before powering up.
Inadequate cleaning and drying can affect the reliability of the
converter and the testing of the final assembly.
Product # NQ04W33SKA10
2.4 - 6.0V
0.75 - 3.6V
10A
SMT
Phone 1-888-567-9596
RoHS Compliance: The EU led RoHS (Restriction of Hazardous
Substances) Directive bans the use of Lead, Cadmium, Hexavalent
Chromium, Mercury, Polybrominated Biphenyls (PBB), and
Polybrominated Diphenyl Ether (PBDE) in Electrical and Electronic
Equipment. This SynQor product is 6/6 RoHS compliant. For
more information please refer to SynQor’s RoHS addendum available at our RoHS Compliance / Lead Free Initiative web page or
e-mail us at [email protected]
www.synqor.com
Doc.# 005-2NK4S3E Rev. D
08/25/2011
Page 12
Input:
Outputs:
Current:
Package:
Technical Specification
2.4 - 6.0V
0.75 - 3.6V
10A
SMT
PART NUMBERING SYSTEM
ORDERING INFORMATION
The part numbering system for SynQor’s NiQor DC/DC converters follows the format shown in the example below.
The tables below show the valid model numbers and ordering
options for converters in this product family. When ordering
SynQor converters, please ensure that you use the complete
15 character part number consisting of the 12 character base
part number and the additional 3 characters for options.
A “-G” suffix indicates the product is 6/6 RoHS compliant. NQ 0 4 W 3 3 S K A 1 0 P S S - G
6/6 RoHS
Options
(see
Ordering Information)
Output Current
Thermal Design
Performance Level
Package Size
Model Number
Input
Voltage
Output
Voltage
Max Output
Current
NQ04W33SKA10xyz-G
2.4 - 6.0V
0.75-3.6V
10A
The following option choices must be included in place of the
x y z spaces in the model numbers listed above.
Output Voltage
Input Voltage
Product Family
The first 12 characters comprise the base part number and
the last 3 characters indicate available options. A “-G” suffix
indicates the product is 6/6 RoHS compliant.
Application Notes
A variety of application notes and technical white papers can
be downloaded in pdf format from our website.
PATENTS
SynQor holds the following U.S. patents, one or more of which apply to
each product listed in this document. Additional patent applications may
be pending or filed in the future.
5,999,417
6,222,742 6,545,890 6,577,109 6,594,159
6,731,520
6,894,468 6,896,526 6,927,987 7,050,309
7,072,190
7,085,146 7,119,524 7,269,034 7,272,021
7,272,023
7,558,083 7,564,702 7,765,687 7,787,261
Contact SynQor for further information:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # NQ04W33SKA10
978-849-0600
888-567-9596
978-849-0602
[email protected]
www.synqor.com
155 Swanson Road
Boxborough, MA 01719
USA
Phone 1-888-567-9596
Warranty
SynQor offers a three (3) year limited warranty. Complete warranty
information is listed on our website or is available upon request from
SynQor.
Information furnished by SynQor is believed to be accurate and reliable. However, no responsibility is assumed by SynQor for its use, nor for any
infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any
patent or patent rights of SynQor.
www.synqor.com
Doc.# 005-2NK4S3E Rev. D
08/25/2011
Page 13
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