Technical
S pecification
BQ55090ETA27
35-55V
Input
Output
9.6V
Current
27A
2000Vdc
Isolation
DC Bus Conver ter
Eighth-brick
The BusQor
®
BQ55090ETA27 bus converter is a next-generation,
board-mountable, isolated, fixed switching frequency DC-DC converter
that uses synchronous rectification to achieve extremely high conversion
efficiency. The power dissipated by the converter is so low that a
heatsink is not required, which saves cost, weight, height, and
application effort. The BusQor series provides an isolated step down
voltage from 48V to a 9.6V intermediate bus with no regulation in a
standard “eighth-brick” module. BusQor converters are ideal for
creating the mid-bus voltage required to drive point-of-load (non-
isolated) converters in intermediate bus architectures. RoHS compliant
(see page 12).
Bus
Conver ter
Operational Features
•
Ultra-high efficiency, >95% at full rated load current
• Delivers up to 27 amps of output current with minimal
derating - no heatsink required
• Input voltage range: 35V – 55V provides 6.5-11V bus
for distributed power architectures
• Fixed frequency switching provides predictable
EMI performance
BQ55090ETA27 Module
Pr otection Features
• Input under-voltage lockout and over-voltage shutdown
protects against abnormal input voltages
• Output current limit and short circuit protection (auto recovery)
• Output over-voltage protection
• Thermal shutdown
Mechanical Features
• Industry standard eighth-brick bus converter pin-out
• Industry standard size: 0.90” x 2.3” x .484”
(22.9x58.4x11.76mm)
• Total weight: 0.7 oz. (20 grams)
• Flanged pins designed to permit surface mount soldering
(avoid wave solder) using FPiP technique
Safety Features
•
•
•
•
2000V, 30 M input-to-output isolation
UL 60950-1:R2011-12
EN60950-1/A12:2011
CAN/CSA-C22.2 No. 60950-1/A1:2011
Contr ol Features
• On/Off control referenced to input side (positive and
negative logic options available)
Product # BQ55090ETA27
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BE559C Rev. E
10/09/2013
Page 1
Technical Specification
MECHANICAL
DIAGRAM
0.140
(3.60)
(58.40)
Input:
Output:
Current:
Package:
2.300
35-55 V
9.6 V
27 A
Eighth-brick
0.150
(3.80)
(50.80)
2.000
Top View
(22.90)
0.900
0.300
(15.24)
0.600
(7.62)
Side View
Bottom side
Clearance
See Note 9
0.076 ±0.028
(1.93 ±0.71)
Lowest
Component
Load Board
(4.57)
See Note 3
0.180
Flanged Pin
See Note 10
0.484 ±0.020
(12.29 ±0.50)
NOTES
1) Pins 1-3 are 0.040” (1.02mm) diameter with 0.080”
(2.03 mm) diameter standoff shoulders.
2) Pins 4 and 5 are 0.062” (1.57 mm) diameter with 0.100”
(2.54 mm) diameter standoff shoulders.
3) Other pin extension lengths available. Recommended pin
length is 0.03” (0.76mm) greater than the PCB thickness.
4) All Pins: Material - Copper Alloy
Finish (RoHS 5/6) - Tin/Lead over Nickel plate
Finish (RoHS 6/6) - Matte Tin over Nickel plate
5) Unmeasured components are shown for visual reference only.
6) All dimensions in inches (mm)
Tolerances: x.xx ±0.02 in. (x.x ±0.5mm)
x.xxx ±0.010 in. (x.xx ±0.25mm)
7) Weight: 0.7 oz. (20 g) typical
8) Workmanship: Meets or exceeds IPC-A-610C Class II
9) UL/TUV standards require a clearance of 0.04” (1.02mm)
around primary areas of the module. Refer to section on Keep
Out Areas under Application Considerations for details.
10) The flanged pins are designed to permit surface mount
soldering (allowing to avoid the wave soldering process)
through the use of the flanged pin-in-paste technique.
PIN DESIGNATIONS
Pin No.
1
2
3
4
5
Name
Vin(+)
ON/OFF
Vin(-)
Vout(-)
Vout(+)
Function
Input Positive (35V - 55V)
Logic control input to turn
converter on and off.
Input Negative
Output Negative
Output Positive
Product # BQ55090ETA27
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BE559C Rev. E
10/09/2013
Page 2
Technical Specification
BQ55090ETA27 ELECTRICAL CHARACTERISTICS
Parameter
ABSOLUTE MAXIMUM RATINGS
Input:
Output:
Current:
Package:
35-55 V
9.6 V
27 A
Eighth-brick
T
A
=25°C, airflow rate=300 LFM, V
in
=48Vdc unless otherwise noted; full operating temperature range is -40°C to +100°C ambient
temperature with appropriate power derating. Specifications subject to change without notice.
Min.
Typ.
Max.
60
56
2000
100
125
18
48
34.3
32
2.4
59.2
56.9
15
3.8
250
1.5\2.0
47
9.60
40/3.8
4.8/460
2/200
100
20
34
0
+10
10
55
Units
V
V
V
°C
°C
V
V
V
V
V
V
V
A
A
mA
A
2
s
mA
mA
A
µH\µF
µF
V
%\V
%\mV
%\mV
V
mV
mV
A
A
V
%
mA
µF
mV
µs
ms
ms
%
%
%
Notes & Conditions
Continuous
Continuous
Basic insulation, Pollution Degree 2
INPUT CHARACTERISTICS
Input Voltage
Non-Operating
Operating
Isolation Voltage (input to output)
Operating Temperature
Storage Temperature
Voltage at ON/OFF input pin
-40
-55
-2
35
OUTPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Voltage Hysteresis
Input Over-Voltage Shutdown
Turn-Off Voltage Threshold
Turn-On Voltage Threshold
Maximum Input Current
No-Load Input Current
Disabled Input Current
Inrush Current Transient Rating
Input Reflected Ripple Current
Input Terminal Ripple Current
Recommended Input Fuse
Input Filter Component Values (L\C)
Recommended External Input Capacitance
Output Voltage Set Point
Output Voltage Regulation
Over Line
Over Load
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
1
Peak-to-Peak
RMS
Operating Output Current Range
Output DC Current-Limit Inception
Output DC Current-Limit Shutdown Voltage
Current Share Accuracy (3 units paralleled)
Back-Drive Current Limit while Disabled
Maximum Output Capacitance
Output Voltage during Load Current Transient
For a Step Change in Output Current (0.1A/µs)
Settling Time
Turn-On Transient
Turn-On Time
Start-Up Inhibit Time
Output Voltage Overshoot
100% Load
50% Load
5.8
0.10
30
0.1
7.0
20
100% Load, 35 Vin
RMS through 10µH inductor; Figures 12 & 14
RMS, full load; Figures 13
Fast blow external fuse recommended
Internal values
Typical ESR 0.1-0.2, see Figure 12
48Vin,
no load
Figure 4
Figure 4
Figure 4
Over sample, line, load, temperature & life
20MHz bandwidth; Figure 12
&
15
Full Load; see Figures 12
&
15
Full Load; see Figures 12
&
15
Subject to thermal derating; Figures
5 &
7
Output Voltage 10% Low; Figure 16
% of rated output current
Negative current drawn from output
9.6Vout at 27A Resistive Load
50% to 75% to 50% Iout max; Figure 11
To within 1% Vout nom
Full load, Vout=90% nom.; Figures 9 & 10
-40°C to +125°C
2,500 µF load capacitance, Iout = 0A
Figures 1 & 3
Figures 1 & 3
Package rated to 150°C
UL rated max operating temp 130°C
See Figures 5 & 7 for derating curves
6.3
11.0
120
40
27
0
DYNAMIC CHARACTERISTICS
3,000
150
200
1
20
0
95.7
96.1
125
125
125
2000
30
EFFICIENCY
TEMPERATURE LIMITS FOR POWER DERATING CURVES
ISOLATION CHARACTERISTICS
Semiconductor Junction Temperature
Board Temperature
Transformer Temperature
Isolation Voltage (dielectric strength)
Isolation Resistance
°C
°C
°C
V
M
Note 1: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: support@synqor.com)
Product # BQ55090ETA27
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BE559C Rev. E
10/09/2013
Page 3
Technical Specification
ELECTRICAL CHARACTERISTICS (Continued)
Parameter
P
FEATURE CHARACTERISTICS
Input:
Output:
Current:
Package:
35-55 V
9.6 V
27 A
Eighth-brick
Min.
120
-1.0
2.4
2.4
-1.0
Typ.
150
Max.
180
0.8
18
18
0.8
Units
kHz
V
V
V
V
V
k
V
°C
°C
Notes & Conditions
RELIABILITY CHARACTERISTICS
Switching Frequency
ON/OFF Control (Option P)
Off-State Voltage
On-State Voltage
ON/OFF Control (Option N)
Off-State Voltage
On-State Voltage
ON/OFF Control (Either Option)
Pull-Up Voltage
Pull-Up Resistance
Output Over-Voltage Protection
Over-Temperature Shutdown
Over-Temperature Shutdown Restart Hysteresis
Load Current Scale Factor
Calculated MTBF (Telcordia)
Calculated MTBF (MIL-217)
Field Demonstrated MTBF
140
9
124
11.6
10
1667
2.36
1.79
Figures A & B
Over full temp range; no load
Average PCB Temperature
See App Note: Output Load Current Calc.
150
10
6
Hrs.
TR-NWT-000332; 80% load,300LFM, 40
o
C T
a
10
6
Hrs.
MIL-HDBK-217F; 80% load, 300LFM, 40
o
C T
a
10
6
Hrs. See our website for values
STANDARDS COMPLIANCE
Parameter
Notes & Conditions
STANDARDS COMPLIANCE
UL 60950-1:R2011-12
Basic insulation
EN60950-1/A12:2011
CAN/CSA-C22.2 No. 60950-1/A1:2011
Note: 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
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
10-55 Hz sweep, 0.060" total excursion, 1 min./sweep, 120 sweeps for 3 axis
100g minimum, 2 drops in x, y and 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, 95% RH, 1000 hours, continuous Vin applied except 5 min/day
MIL-STD-883, method 2003
Product # BQ55090ETA27
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BE559C Rev. E
10/09/2013
Page 4
Technical Specification
100
95
90
85
80
75
70
0
3
6
9
12
15
18
21
35 Vin
48 Vin
55 Vin
24
27
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
3
6
Input:
Output:
Current:
Package:
35-55 V
9.6 V
27 A
Eighth-brick
Power Dissipation (W)
Efficiency (%)
35 Vin
48 Vin
55 Vin
9
12
15
18
21
24
27
Load Current (A)
Load Current (A)
Figure 1:
Efficiency at nominal output voltage vs. load current for
minimum, nominal, and maximum input voltage at 25
°
C.
Figure 2:
Power dissipation at nominal output voltage vs. load current
for minimum, nominal, and maximum input voltage at 25
°
C.
98
12
11
Output Voltage
(V)
10
9
8
7
6
5
4
400
97
Efficiency
(%)
96
95
94
93
25 C
40 C
55 C
0
100
200
300
35V
48V
55V
0
5
10
15
20
25
92
Air Flow
(LFM)
Load Current
(A)
Figure 3:
Efficiency at nominal output voltage and 60% rated power vs.
airflow rate for ambient air temperatures of 25
°
C, 40
°
C, and 55
°
C
(nominal input voltage).
Figure 4:
Output voltage regulation vs. load current for minimum,
nominal, and maximum input voltage at 25
°
C.
25
20
I
OUT
(A)
15
400 LFM
300 LFM
200 LFM
100 LFM
10
5
0
25
40
55
70
85
Ambient Air Temperature (
o
C)
Semiconductor junction temperature is
within 1°C of surface temperature
Figure 5:
Maximum output power derating curves vs. ambient air
temperature for airflow rates of 100 LFM through 400 LFM with air
flowing from pin 1 to pin 3 (nominal input voltage).
Product # BQ55090ETA27
Phone 1-888-567-9596
Figure 6:
Thermal plot of converter at 27 amp load current (250W)
with 55
°
C air flowing at the rate of 200 LFM. Air is flowing across the
converter from pin 1 to pin 3 (nominal input voltage).
Doc.# 005-2BE559C Rev. E
10/09/2013
Page 5
www.synqor.com
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