Q2D Series – Quarter-Brick DC/DC Converter
48V Input
Dual Output
Data Sheet
Features
•
•
•
•
•
•
•
•
•
Independent outputs of any combination of
voltages from 1.2V to 5.0V
Simultaneously delivers 15A per output from
1.2V to 3.3V; 10A for 5V output
Extremely low-profile (<8mm or 0.30”) single-
board design. No heatsink required.
Light Weight: 28 g ( 1.00 oz)
Surface mount and through-hole versions
High efficiency
No minimum load required on either output
Starts-up into pre-biased outputs
Meets transient withstand requirements of
Bellcore GR-513
Fixed frequency operation
Remote on/off (primary referenced), positive
or negative logic
Output voltage trim.
±
10% for each output
Output overcurrent protection
Output overvoltage protection
Overtemperature protection
Applications
•
•
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Distributed power architectures
Telecommunications equipment
LAN/WAN applications
Data processing applications
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Description
The new Q2D series of dual output DC/DC converters offer unprecedented density and performance in an
industry standard, quarter-brick footprint. Patent pending technology and state-of-the-art packaging
techniques achieve a total of 30A (25A for 5V output) output current, 15A (10A for 5V output) per channel,
without a heatsink. Extremely low profile (<8mm or 0.30”) enables the converters to be used in applications
where spacing between circuit boards is limited. The 100% surface-mount design provides consistent high
quality and reliability. The SMT mounting option eliminates the need for separate (additional manual)
process in attaching the converters to the motherboards during mass production.
Location of the Thermocouple for Thermal Testing.
Rev. NOV 13, 2002
Page 1 of 14
Q2D Series – Quarter-Brick DC/DC Converter
48V Input
Dual Output
Part Numbering Guide
Product
Series
Output
Current
Input
Voltage
Output
Voltage 2
Output
Voltage 1
ON/OFF
Logic
Surface
Mount
Data Sheet
Pin
Length
Height
Option
Q2D
25
Z
G
G = 5.0VDC
E = 3.3VDC
D = 2.5VDC
E
E = 3.3VDC
D = 2.5VDC
B = 1.8VDC
Y = 1.2VDC
-
N
N
⇒
Negative
(Blank)
⇒
Positive
M6
M6
⇒
Surface
Mount
(Blank)
⇒
Through
Hole
Blank
⇒
0.188”
7
⇒
0.145”
8
⇒
0.110”
Not valid w/M6
Option
C2
See Chart
Below
Not Valid
w/M6
Option
Dual
Quarter-
Brick
Format
Vout2 = 5V,
Iout = 25A
Vout2<5V
Iout = 30A
48Vin
Nom.
Base Model Selection Guide
Model
Input
voltage
range,
VDC
36-75
36-75
36-75
36-75
36-75
36-75
36-75
Output
Voltage,
Vout 2
VDC
5.0
5.0
5.0
3.3
3.3
3.3
2.5
Output
Voltage,
Vout 1
VDC
3.3
2.5
1.8
2.5
1.8
1.2
1.8
Output
Current,
Output 2
ADC
10
10
10
15
15
15
15
Output
Current,
Output 1
ADC
15
15
15
15
15
15
15
Q2D25ZGE
Q2D25ZGD
Q2D25ZGB
Q2D30ZED
Q2D30ZEB
Q2D30ZEY
Q2D30ZDB
Height, Clearance and Pin Options for Through Hole Versions
HT
(Maximum Height)
Height
Option
blank
C2
C3
C4
+0.000 [+0.00]
-0.038 [- 0.97]
0.303 [7.69]
0.336 [8.53]
0.400 [10.16]
0.500 [12.70]
CL
(Minimum Clearance)
+0.030 [+0.77]
-0.000 [- 0.00]
0.030 [ 0.77]
0.063 [1.600]
0.127 [3.23]
0.227 [5.77]
Pin
Option
PL
Pin Length
±0.005
[±0.13]
0.188 [4.77]
0.145 [3.68]
0.110 [2.79]
7
8
Rev. NOV 13, 2002
Page 2 of 14
Q2D Series – Quarter-Brick DC/DC Converter
48V Input
Dual Output
Absolute Maximum Ratings
Data Sheet
Stresses in excess of the absolute maximum ratings may cause performance degradation, adversely effect
long-term reliability, and cause permanent damage to the converter.
Parameter
Input voltage
PCB Operating Temperature
Storage Temperature
ON/OFF Control Voltage
Conditions/Description
Operating Input Voltage
Transient, 100 ms
At 100% load
Referenced to -Vin
Min
0
-40
-40
-1
Max
80
100
100
125
13.5
Units
VDC
VDC
°C
°C
VDC
Environmental and Mechanical Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise
noted.
Parameter
Vibration
Weight
Water Washing
MTBF
Conditions/Description
Halfsine wave, 10-55 Hz, 3 axes,
5 min each
Standard process
Telcordia TR -332
Method I Case 1
Min
Nom
Max
5
Units
g
Oz/g
MHrs
1.0/28
Yes
2.6
Isolation Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise
noted.
Parameter
Insulation Safety Rating
Isolation Voltage
Isolation Resistance
Isolation Capacitance
Conditions/Description
Min
2000
10
1.3
Nom
Basic
Max
Units
VDC
MΩ
nF
Input Specifications
All specifications apply over specified input voltage, output load and temperature range, unless otherwise
noted.
Parameter
Input Voltage
Turn-On Input Voltage
Turn-Off Input Voltage
Turn-On Time
Input Reflected Ripple Current
Input Inrush Current Limit
Conditions/Description
Continuous
Ramping Up
Ramping Down
To Output Regulation Band
100% Resistive Load
Full Load, 12uH source
inductance
Vin = Vin max
Min
36
33
31
Nom
48
34
32
3
6
1
Max
75
35
33
Units
VDC
VDC
VDC
mS
mA p-p
A s
2
Rev. NOV 13, 2002
Page 3 of 14
Q2D Series – Quarter-Brick DC/DC Converter
48V Input
Dual Output
Output Specifications
Data Sheet
All specifications apply over specified input voltage, output load and temperature range, unless otherwise
noted.
Parameter
Output Voltage Setpoint Accuracy
Output Current* Vout1
Output Current* Vout2
Conditions/Description
Vin = Vin nom, Full Load
Min
-1.5
0
0
Nom
Max
+1.5
15
15
10A if
Vo2= 5.0
Units
%Vout
ADC
ADC
Line Regulation Vout1
Line Regulation Vout2
Load Regulation, Vout1
Load Regulation, Vout2
Dynamic Regulation
Peak Deviation
Settling Time
Admissible Load Capacitance
Output Current Limit Threshold**
Switching Frequency
Overvoltage Protection,
Non Latching
Trim Range
Vin.min to Vin max, Iout max
Vin min to Vin max, Iout max
Vin = Vnom, Iout min to
Iout max
Vin = Vnom, Iout min to
Iout max
50-75% load step change
to 1% error band
Iout max, Nom Vin
Vout=0.97Vout nom
Over all input voltage and
load conditions
Iout max, Vin = Vnom
+/-2
+/-2
-10
-10
mV
mV
mV
mV
110
435
115
90
40
60
10,000
160
140
110
mV
µs
µF
%Iout
kHz
%Vout
%Vout
** Overcurrent protection is non-latching with auto-recovery.
Feature Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise
noted.
Parameter
Shutdown (ON/OFF)
Negative Logic
Converter ON
Converter OFF
Positive Logic
Converter ON
Converter OFF
Overtemperature
Protection
ON/OFF pin is connected to -Vin
PCB Temperature
On/Off signal is low –converter is OFF
2.4
-20
120
20
0.8
VDC
VDC
VDC
mADC
°C
Conditions/Description
On/Off signal is low – converter is ON
ON/OFF pin is connected to -Vin
Min
Nom
Max
Units
-20
2.4
0.8
20
VDC
VDC
VDC
Rev. NOV 13, 2002
Page 4 of 14
Q2D Series – Quarter-Brick DC/DC Converter
48V Input
Dual Output
Start-up Information (using negative ON/OFF)
Scenario #1: Initial Start-up From Bulk Supply
ON/OFF function enabled, converter started via
application of V
IN
. See Figure 1.
Time
Comments
t
0
ON/OFF pin is ON; system front end power
is toggled on, V
IN
to converter begins to rise.
t
1
V
IN
crosses
Under-Voltage
Lockout
protection circuit threshold; converter
enabled.
t
2
Converter begins to respond to turn-on
command (converter turn-on delay).
t
3
Output voltage V
OUT
1 reaches 100% of
nominal value.
t
4
Output voltage V
OUT
2 reaches 100% of
nom inal value.
For this example, the total converter start-up time (t
4
- t
1
)
is typically 3ms.
t
5
Data Sheet
Output voltage V
OUT
1 reaches 100% of
nominal value.
t
6
Output voltage V
OUT
2 reaches 100% of
nominal value.
For the condition,
(t
2
- t
1
) = 100ms,
the total converter
start-up time (t
6
- t
2
) is typically 103ms. For
(t
2
- t
1
) > 100
ms,
start-up time will be typically 3ms after release of
ON/OFF pin.
V
IN
ON/OFF
STATE
OFF
ON
V
OUT
2
V
OUT
1
V
OUT
2
V
OUT
1
Scenario #2: Initial Start-up Using ON/OFF Pin
With V
IN
previously powered, converter started via
ON/OFF pin. See Figure 2.
Time
Comments
t
0
V
INPUT
at nominal value.
t
1
Arbitrary time when ON/OFF pin is enabled
(converter enabled).
t
2
End of converter turn-on delay.
t
3
Output voltage V
OUT
1 reaches 100% of
nominal value.
t
4
Output voltage V
OUT
2 reaches 100% of
nominal value.
For this example, the total converter start-up time (t
4
-
t
1
) is typically 3ms.
Scenario #3: Turn-off and Restart Using ON/OFF
Pin
With V
IN
previously powered, converter is disabled and
then enabled via ON/OFF pin. See Figure 3.
Time
Comments
t
0
V
IN
and V
OUT
are at nominal values; ON/OFF
pin ON.
t
1
ON/OFF pin arbitrarily disabled; converter
outputs fall to zero; turn-on inhibit delay
period (100ms typical) is initiated, and
ON/OFF pin action is internally inhibited.
t
2
ON/OFF pin is externally re-enabled.
If (t
2
- t
1
) = 100ms,
external action of
ON/OFF pin is locked out by start-up
inhibit timer.
If (t
2
- t
1
) > 100ms,
ON/OFF pin action is
internally enabled.
t
3
Turn-on inhibit delay period ends. If ON/OFF
pin is ON, converter begins turn-on; if off,
converter awaits ON/OFF pin ON signal; see
Figure 6.
t
4
End of converter turn-on delay.
t
0
t
1
t
2
t
3
t
4
Fig. 1. Start-up Scenario #1
V
IN
ON/OFF
STATE OFF
ON
V
OUT
2
V
OUT
1
V
OUT
2
V
OUT
1
t
0
t
1
t
2
t
3
t
4
Fig. 2. Start-up Scenario #2
V
IN
ON/OFF
STATE OFF
100 ms
ON
V
OUT
2
V
OUT
1
V
OUT
2
V
OUT
1
t
0
t
1
t
2
t
3
t
4
t
5
t
6
Fig. 3. Start-up Scenario #3
Rev. NOV 13, 2002
Page 5 of 14
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