NOV 11, 2003 revised to NOV 20, 2006 Page 1 of 3 www.power-one.com
QD48 Dual Quarter Brick Family
D
C
-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 heatsinks 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.
Applications
• Telecommunications
• Data communications
• Wireless
• Servers
Features
• 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 heat sink re quired
• 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 VNOM 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
QD48S Converte
r
NOV 11, 2003 revised to NOV 20, 2006 Page 2 of 3 www.power-one.com
QD48 Dual Quarter Brick Family
D
C
-DC Converter Data Sheet
Physical Information
SIDE VIEW
TOP VIEW
2
3
1
4
5
6
7
QD48S Pinout (Surface mount)
SIDE VIEW
1
2
7
TOP VIEW
34
6
5
QD48T Pinout (Through-hole)
Pin Connections
Pin # Function
1 Vin (+)
2 ON/OFF
3 Vin (-)
4 VOUT1(+)
5 RTN [Vo1(-) +Vo2(-)]
6 TRIM
7 VOUT2 (+)
Height
Option
[HT]
(Max. Height)
+0.000 [0.00]
- 0.038 [-0.97]
[CL]
(Min. Clearance)
+0.016 [+0.41]
-0.000 [-0.00]
A 0.303 [7.69] 0.030 [0.77]
B 0.336 [8.53] 0.063 [1.60]
C 0.500 [12.70] 0.227 [5.77]
D 0.400 [10.16] 0.127 [3.23]
PL
Pin Length
Pin
Option ±0.005 [±0.13]
A 0.188 [4.77]
B 0.145 [3.68]
C 0.110 [2.79]
QD48T Platform Notes
• 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] typical
QD48S Platform Notes
• All dimensions are in inches [mm]
• Connector Material: Copper
• Connector Finish: Gold over Nickel
• Module Weight: 1 oz [28 g] typical
• Recommended surface mount pads:
Min. 0.080” X 0.112”
Max. 0.092”X 0.124”
NOV 11, 2003 revised to NOV 20, 2006 Page 3 of 3 www.power-one.com
QD48 Dual Quarter Brick Family
D
C
-DC Converter Data Sheet
Converter Part Numbering Scheme
Product
Series Input
Voltage Mounting
Scheme
Output
Voltage 1
(VOUT1 )
Output
Voltage 2
(VOUT2)
ON/OFF
Logic
Maximum
Height
[HT]
Pin
Length
[PL]
Special
Features
QD 48 S 025 033 - N S 0 0
012 ⇒ 1.2 V
015 ⇒ 1.5 V
018 ⇒ 1.8 V
020 ⇒ 2.0 V
025 ⇒ 2.5 V
033 ⇒ 3.3 V
015 ⇒ 1.5 V
018 ⇒ 1.8 V
020 ⇒ 2.0 V
025 ⇒ 2.5 V
033 ⇒ 3.3 V
050 ⇒ 5.0 V
Dual
Quarter-
Brick
Format
36-75 V
S ⇒
Surface
Mount
T⇒
Through-
hole Note: Always specify VOUT2 as the
higher of the two output voltages.
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
The example above describes P/N QD48S025033-NS00: 36-75 V input, dual output, surface mounting, 2.5 V and 3.3 V outputs @ 15 A each, negative
ON/OFF logic. Please consult factory regarding availability of a specific version.
RoHS Ordering Information:
• 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 f or use in, or authorized for use as com ponents in life support
systems, equipment used in hazardous environments, or nuclear control s ystems without the express written consent of the respective divisional president o f
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.
