QD48 Dual Quarter Brick Family
DC-DC Converter Data Sheet
The new
QD48
Family of dual output, 48 V input, DC-DC
converters from Power-One offers unprecedented per-
formance in a quarter brick package by providing two in-
dependently regulated high current outputs. This is ac-
complished by the use of patent pending circuit and pack-
aging techniques to achieve ultra-high efficiency, excellent
thermal performance and a very low body profile.
In telecommunications applications the
QD48
converters
provide up to 15 A per channel simultaneously - 30 A total -
with thermal performance far exceeding existing dual quarter
bricks and comparable to dual half bricks.
Unique to quarter bricks, the
QD48
converters utilize inde-
pendent power trains and control functions for each output,
allowing very tight output voltage regulation and very low
channel interference. In some applications they can be used
to replace two single-output quarter bricks.
Low body profile and the preclusion of heat sinks minimize
airflow shadowing, thus enhancing cooling for downstream
devices. The use of 100% surface-mount technologies for
assembly, coupled with Power-One’s advanced electric and
thermal circuitry and packaging, result in a product with ex-
tremely high reliability.
The
QD48
family provides any combination of standard volt-
ages from 5.0 V to 1.2 V in an industry standard seven-pin
package. Outputs can be trimmed from –10% to +10% of the
nominal output voltage, thus providing outstanding design
flexibility.
The
QD48
family is designed to be a drop-in replacement for
existing dual designs, and utilizes a common trim function for
both outputs. The converters are also available in a surface
mount package.
Inclusion of this new converter in new designs can result in a
significant reliability improvement over other available duals
because of its optimized thermal efficiency.
QD48T Converter
Features
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RoHS lead-free solder and lead-solder-exempted
products are available
Two independently regulated outputs in any combina-
tion of voltages from 1.2 V to 5.0 V
Simultaneously delivers 15 A per output from 1.2 V to
3.3 V; 10 A for 5 V output
Minimal cross-channel interference
Can replace two single-output quarter bricks
High efficiency – no heatsink required
High reliability
On-board differential input LC- filter
Start-up into pre-biased outputs
No minimum load required on either output
Available in through-hole and SM packages
Industry-standard pinout
Industry-standard footprint: 1.45” x 2.30”
Low profile: 0.26” [6.6 mm]
Low weight: 1 oz [28 g] typical)
Meets Basic Insulation requirements of EN60950
Withstands 100 V input transient for 100 ms
Positive or negative logic ON/OFF referenced to input
Fixed-frequency operation
Both outputs trimmed via common external trim resis-
tor, range: +10%/-10% of V
NOM
for both outputs
UL 60950 recognized in US and Canada and DEMKO
certified per IEC/EN 60950
Meets FCC Class B and IEC/EN 55022 Class B con-
ducted requirements with external filter
Applications
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Telecommunications
Data communications
Wireless
Servers
MAY 08, 2003 revised to NOV 20, 2006
Page 1 of 3
www.power-one.com
QD48 Dual Quarter Brick Family
DC-DC Converter Data Sheet
Physical Information
QD48S Platform Notes
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3
4
5
2
All dimensions are in inches [mm]
Connector Material: Copper
Connector Finish: Gold over Nickel
Module Weight: 1 oz [28 g]
Recommended surface mount pads:
Min. 0.080” X 0.112”
Max. 0.092”X 0.124”
BOTTOM VIEW
6
7
1
Pin Connections
Pin #
Function
SIDE VIEW
1
2
3
4
5
6
7
Vin (+)
ON/OFF
Vin (-)
V
OUT1
(+)
RTN [Vo1(-) +Vo2(-)]
TRIM
V
OUT2
(+)
[CL]
(Min. Clearance)
+0.016 [+0.41]
-0.000 [-0.00]
0.030 [0.77]
0.063 [1.60]
0.227 [5.77]
0.127 [3.23]
QD48S Pinout (Surface mount)
Height
Option
A
B
C
D
1
2
3
7
6
[HT]
(Max. Height)
+0.000 [0.00]
- 0.038 [-0.97]
0.303 [7.69]
0.336 [8.53]
0.500 [12.70]
0.400 [10.16]
TOP VIEW
5
4
Pin
Option
A
B
C
PL
Pin Length
±0.005 [±0.13]
0.188 [4.77]
0.145 [3.68]
0.110 [2.79]
SIDE VIEW
QD48T Platform Notes
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All dimensions are in inches [mm]
All pins are 0.040”[1.02] diameter with
0.078” [1.98] shoulder
Pin material: Brass
Pin Finish: Tin/Lead over Nickel
Pin Length: Options shown on page 3
Module Weight: 1 oz [28 g]
QD48T Pinout (Through-hole)
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MAY 08, 2003 revised to NOV 20, 2006
Page 2 of 3
www.power-one.com
QD48 Dual Quarter Brick Family
DC-DC Converter Data Sheet
Converter Part Numbering Scheme
Product
Series
Input
Voltage
Mounting
Scheme
Output
Voltage 1
(V
OUT1
)
Output
Voltage 2
(V
OUT2
)
ON/OFF
Logic
Maximum
Height
[HT]
Pin
Length
[PL]
Special
Features
QD
48
T
025
012
⇒
1.2 V
015
⇒
1.5 V
018
⇒
1.8 V
020
⇒
2.0 V
025
⇒
2.5 V
033
⇒
3.3 V
033
015
⇒
1.5 V
018
⇒
1.8 V
020
⇒
2.0 V
025
⇒
2.5 V
033
⇒
3.3 V
050
⇒
5.0 V
-
N
B
A
0
Dual
Quarter-
Brick
Format
S
⇒
Surface
Mount
36-75 V
T⇒
Through-
hole
N
⇒
Negative
P
⇒
Positive
SMT
S
⇒
0.273”
Through hole
A
⇒
0.303”
B
⇒
0.336”
C
⇒
0.500”
D
⇒
0.400”
SMT
0
⇒
0.00”
Through hole
A
⇒
0.188”
B
⇒
0.145”
C
⇒
0.110”
0
⇒
STD
Note: Always specify V
OUT2
as the
higher of the two output voltages.
The example above describes P/N QD48T025033-NBA0: 36-75 V input, through-hole dual output, 2.5 V and 3.3 V outputs @ 15 A each, negative
ON/OFF logic, a maximum height of 0.336”, and a through the board pin length of 0.188”. Please consult factory regarding availability of a specific version.
RoHS Ordering Information:
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No RoHS suffix character is required for lead-solder-exemption compliance.
For RoHS compliance to all six substances, add the letter "G" as the last letter of the part number.
NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not designed, intended for use in, or authorized for use as components in life support
systems, equipment used in hazardous environments, or nuclear control systems without the express written consent of the respective divisional president of
Power-One, Inc.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the date
manufactured. Specifications are subject to change without notice.
MAY 08, 2003 revised to NOV 20, 2006
Page 3 of 3
www.power-one.com
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