B Q 5 5 0 9 0 Q P A 4 0 bu s c o n v e r t e r i s a n e x t - g e n -
e ra t ion , b oa r d- mou n ta b le , is ol at e d, fixed s wit ch ing fr equ en -
c y d c/d c con verter tha t u s es s yn ch ro no us rec tifica tion to
a ch iev e extrem ely high c on ver s ion eff icien cy . Th e po wer
dis sipated by the c onver ter is so l ow that a h eatsi nk i s no t
r eq ui red , wh ich s aves co st, we ight, h eigh t, a nd a pp l ica tion
e ffor t. The B us Q or ser ies pr ovid es an iso la ted step do wn vol t -
a ge fr om 48 V t o a 9 .6V in t er med iat e b us wit h n o r egul a ti on
in a sta n da r d “q u ar ter -b ri ck ” mod u le. Bu sQ or c on ve rter s a re
id ea l for c re atin g th e mid - bu s vol tage re qu ir ed to dr ive p oi nt-
o f-l oa d (n on -i so la ted ) co nver ter s in in term edia te bu s a rc hite c -
tures. RoHS compliant (see page 12 ).
Operational Features
• Ultra-high efficiency, 96.5% at 40A
• Delivers up to 43 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 per-
formance
Bus
Conver ter
BQ55090QPA40 Module
Pr otection Features
• Input under-voltage lockout and over-voltage shutdown
protects against abnormal input voltages
• Output current limit and short circuit protection
• Thermal shutdown
Mechanical Features
• Industry standard quarter-brick bus converter pin-out
• Industry standard size: 1.45” x 2.3” (36.8x58.4mm)
• Total height only 0.467” (11.86mm), permits better air-
flow and smaller card pitch
• Total weight: 1.5 oz. (42 grams)
• Flanged pins designed to permit surface mount solder-
ing (avoid wave solder) using FPiP technique
Safety Features
• 2000V, 30 MΩ input-to-output isolation
• UL/cUL 60950-1 recognized (US & Canada), basic
insulation rating
• TUV certified to EN60950-1
• Meets 72/23/EEC and 93/68/EEC directives
• Meets UL94V-0 flammability requirements
Contr ol Features
• On/Off control referenced to input side (positive and
negative logic options available)
• Inherent current share (by droop method) for high cur-
rent and parallel applications.
Product # BQ55090QPA40
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ559K Rev. 8
09/07/06
Page 1
Technical Specification
MECHANICAL
DIAGRAM
Y
AR
N
IMI
L
RE
P
Input:
Output:
Current:
Package:
35-55 V
9.6 V
43 A
Quarter-brick
2.30
(58.4)
2.00
(50.8)
0.14
(3.6)
1
5
Top View
2
3
0.600
(15.24)
1.45
(36.8)
4
0.300
(7.62)
0.600
0.43
(10.9)
(15.24)
0.467 +0.020
(11.86 +0.5)
0.145
(3.68)
See Note 3
Side View
Load Board
Lowest
Component
0.063 +0.020
Flanged Pin
See Note 10
(1.6 +0.5)
Bottom side
Clearance
See Note 9
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 - Matte Tin over Nickel plate
5) Undimensioned 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: 1.5 oz. (42 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.
Product # BQ55090QPA40
Phone 1-888-567-9596
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
www.synqor.com
Doc.# 005-2BQ559K Rev. 8
09/07/06
Page 2
Technical Specification
Y
AR
N
IMI
L
RE
P
Input:
Output:
Current:
Package:
35-55 V
9.6 V
43 A
Quarter-brick
BQ55090QPA40 ELECTRICAL CHARACTERISTICS
Parameter
ABSOLUTE MAXIMUM RATINGS
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 tem-
perature with appropriate power derating. Specifications subject to change without notice.
Min.
Typ.
Max.
60
55
2000
100
125
18
48
55
34
31
4
59.5
58
7.0
7
140
0.22\11
47
9.6
42\4.0
5.2\500
2\200
6.5
50
12
50
5
+10
10
14
200
100
3
0
96.5
97.0
125
125
125
2000
30
250
5
11.0
100
43
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
dB
mV
µs
µs
ms
%
%
%
°C
°C
°C
V
M
Ω
Notes & Conditions
Continuous
Continuous
Basic insulation, Pollution Degree 2
Input Voltage
Non-Operating
Operating
Isolation Voltage (input to output)
Operating Temperature
Storage Temperature
Voltage at ON/OFF input pin
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
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
Input Voltage Ripple Rejection
Output Voltage during Load Current Transient
For a Step Change in Output Current (0.1A/µs)
Settling Time
Turn-On Transient
Turn-On Time (without output capacitance)
Turn-On Time (with output capacitance)
Output Voltage Overshoot
93% Load
50% Load
Semiconductor Junction Temperature (see Note 1)
Board Temperature
Transformer Temperature
Isolation Voltage (dielectric strength)
Isolation Resistance
-40
-55
-2
35
30
29
2
58.5
57
INPUT CHARACTERISTICS
9.5
0.13
15
0.01
10
20
100% Load, 35 Vin
OUTPUT CHARACTERISTICS
RMS through 10µH inductor; Figure 14
RMS; Figure 13
Fast blow external fuse recommended
Internal values
Typical ESR 0.1-0.2
Ω
,
48Vin, no load
0
Over sample, line, load, temperature & life
20MHz bandwidth
Full Load; see Figure 15
Full Load
Subject to derating
Above 50% of rated output current
Negative current drawn from output
9.6Vout at 40A Resistive Load
Figure 19
50%-75%-50% Iout max; Figure 11
To within 1% Vout nom
Full load, Vout=90% nom., 0 output cap.
Full load, Vout=90% nom., 3,000 µF cap.
3,000 µF load cap., Iout = 0A, Vin nom.
Figure 1; 48Vin, 40A
Figure 1
Package rated to 175°C
Board rated to 165°C
4,000
DYNAMIC CHARACTERISTICS
EFFICIENCY
TEMPERATURE LIMITS FOR POWER DERATING CURVES
ISOLATION CHARACTERISTICS
1. For normal operating conditions of 55°C ambient temperature and 200 LFM airflow. Device is designed to operate for a minimum of 72 hours, once per
year under the following conditions: 70°C, 200 LFM airflow, 38Vin, 300W output power. Junction temperature during those conditions will exceed the listed
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