Data Sheet
June 2001
Titania ™ Power Modules
Austin Lite Non-Isolated SMT DC - DC Power Modules:
3.3 Vdc and 5.0 Vdc Input, 1.5 Vdc - 3.3 Vdc Output, 5A
Features
s
s
s
s
Small size and very low profile
Minimal space on printed circuit board
Surface mountable
Single output maximum dimensions:
33 mm x 12.95 mm x 5.46 mm
(1.3 in x 0.530 in x 0.215 in.), tolerance of +/- 0.01
High reliability: designed to meet 200 FITs/5 million
hour MTBF
High efficiency
5.0 V
IN
87% typical @ 3.3V, 5A
3.3 V
IN
86% typical @ 2.5V, 5A
Single control pin for output voltage margining and
on/off control
Instantaneous auto-reset overcurrent protection
(non-latching)
Overtemperature protection
No external bias required
Low inductance surface mount connections
Designed to meet
UL
†
60950, CSA
‡
C22.2 No.
60950-00, and VDE 0805 (IEC60950)
§
s
s
The Austin Lite Power Module provides precise voltage in an
industry leading small footprint while offering very high reli-
ability and high efficiency.
Applications
s
s
s
s
s
s
s
s
s
s
Workstations
Servers
Desktop computers
DSP applications
Distributed power architectures
Telecommunications equipment
Adapter cards
LAN/WAN applications
Data processing applications
s
s
s
s
s
Description
The Austin Lite Power Module is designed to meet the precise voltage requirements of today’s high perfor-
mance DSP and microprocessor circuits and system board level applications. Advanced circuit techniques, high
frequency switching, custom components, and very high density, surface mountable packaging technology
deliver high quality, ultra compact, DC-DC conversion.
†
UL
is a registered trademark of Underwriters Laboratories, Inc.
‡
CSA
is a registered trademark of Canadian Standards Association.
§
VDE
is a trademark of Verband Deutscher Elektrotechniker e.V.
Austin Lite Non-Isolated SMT DC - DC Power Modules:
3.3 Vdc and 5.0 Vdc Input, 1.5 Vdc - 3.3 Vdc Output, 5A
Data Sheet
June 2001
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso-
lute maximum stress ratings only. Functional operation of the device is not implied at these or any other conditions
in excess of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for
extended periods can adversely affect device reliability. Input voltage range of V
IN
= 3.0V is listed as 3.3 V
IN
and
input voltage range of V
IN
= 4.5V - 5.5V is listed as 5.0 V
IN
..
Parameter
Input Voltage (continuous)
Imposed Output Voltage
CTRL Terminal Voltage
Storage Temperature
Device
3.3 V
IN
5.0 V
IN
All
All
All
Symbol
V
IN
V
IN
V
OIF
CTRL
T
A/STG
Min
-0.3
-0.3
-0.3
-0.3
-40
Max
3.6
5.5
5.5
2.0
125
Unit
Vdc
Vdc
Vdc
Vdc
°C
Electrical Specifications
Table 1. Input Specifications
Parameter
Operating Input Voltage
Input Ripple Rejection (120 Hz)
Operating Input Current
(0A
≤
I
OUT
< 5A)
(3.0 V < V
IN
< 3.6V)
(4.5V < V
IN
< 5.5V)
Quiescent Input Current (I
OUT
= 0)
(3.0V < V
IN
< 5.5V)
Input Ripple Current: 20 MHz BW, 250 nH
Input Inductance (see Figure )
Fusing Considerations
CAUTION: This power module is not internally fused. An input line fuse must always be used.
This power module can be used in a wide variety of applications, ranging from simple stand-alone operation to an
integrated part of a sophisticated power architecture. To preserve maximum flexibility, internal fusing is not
included; however, to achieve maximum safety and system protection, always use an input line fuse. The safety
agencies require a normal blow fuse with a maximum rating of 10A (see Safety Specifications on page ).
Device
3.3 V
IN
5.0 V
IN
Symbol
V
IN
V
IN
Min
3.0
4.5
Typ
3.3
5.0
50
Max
3.6
5.5
Unit
V
V
dB
3.3 V
IN
5.0 V
IN
All
3.3 V
IN
5.0 V
IN
I
IN
I
IN
I
Q
I
INripple
I
INripple
—
—
—
—
—
6
5.5
—
A
A
mA
mAp-p
mAp-p
35 mAp-p
Output Control
The control pin is a dual-function port that serves to enable/disable the converter or provide a means of adjusting
the output voltage over a prescribed range. When the control pin is grounded, the converter is disabled. With the
pin left open, the converter regulates to its specified output voltage. For any other voltage applied to the pin, the
output voltage follows this relationship:
V
CONTROL
V
OUT
=
•
V
OUTNOM
1.5
2
Tyco Electronics Corp.
Data Sheet
June 2001
Austin Lite Non-Isolated SMT DC - DC Power Modules:
3.3 Vdc and 5.0 Vdc Input, 1.5 Vdc - 3.3 Vdc Output, 5A
Output Control
(continued)
The output voltage may be margined up or down in direct proportion to the percentage deviation of the control pin
from 1.5V. The control pin may be driven by an imposed voltage to margin up or down or shunted by a resistive ele-
ment to ground for margin down. The preferred margin technique employs an external control voltage to margin up
or down. A resistor shunt may be used to margin down but the reference will sag due to its internal impedance.
V
OUT
:
V
CONTROL
:
V
OUTNOM
:
R
MARGIN
:
The value of the output voltage after margining
The voltage at the CTRL pin
The ouput voltage if the control pin is left open
The shunt resistor to ground for margining
TO FB
51.1 K
CTRL
–
+
499
+
+
V
CONTROL
–
1.5 V
–
REFERENCE
100 µA
1-0249
Margin Up
To margin the converter up apply a voltage to the CTRL pin that is above 1.50 volts by the same percentage as the
desired margin up percentage
V
CONTROL
= 1.5 (1 +
MARGIN UP
%)
Example:Margin up 5%: Applying 1.575 volts to the CTRL pin will increase the output voltage by 5% over its
unmargined value
V
CONTROL
= 1.5 (1 + .05)
V
CONTROL
= 1.575
Margin Down
Assume a percentage to margin down. Then connect a resistor R
MARGIN
between CTRL and GND. Use the follow-
ing relations to decide the value of R
MARGIN:
TO FB
51.1 K
CTRL
–
+
R
MARGIN
499
1.5 V REFERENCE
–
100 µA
+
1-0250
Tyco Electronics Corp.
3
Austin Lite Non-Isolated SMT DC - DC Power Modules:
3.3 Vdc and 5.0 Vdc Input, 1.5 Vdc - 3.3 Vdc Output, 5A
Data Sheet
June 2001
Output Control
(continued)
Margin Down
(continued)
1 – margin%
R
MARGIN
= 499
•
----------------------------------------------
-
1 – (1 – margin%)
Example: To margin down 5%, then:
R
MARGIN
=
1 – .05
-
499
•
-------------------------------
1 – (1 – .05)
R
MARGIN
= 9481
Because margining affects the system reference, margining beyond 10% is unacceptable and 0% - 5% is desirable.
Margining the unit down beyond 5% requires derating the available current by 1% for every percent beyond 5 that
the module is margined down. For example, if a module were margined down 7%, output current would have to be
derated 2%.
Special Note:The 3.3/2.5V version must be operated at nominal line to achieve margin up.
The margin up available for this version is maximum 5%
Output Regulation
These modules make use of inherent output resistance to facilitate improved transient response. This means that
the output voltage will decrease with increasing output current. For this reason, the total DC regulation window at
any given operating temperature is comprised of a no-load setpoint and a load dependent voltage drop due to mod-
ule output resistance. Regulation data provided in Table 2 includes both the initial set point and this voltage drop.
Because Table 2 includes output resistance drop, the maximum column represents a no-load condition while the
minimum column represents a full-load condition. Production test limits are set such that no module could pass
with a full-load regulation point equal to the maximum column. This means that at any operating current, the regu-
lation will always be better than the total window specified in Table 2.
4
Tyco Electronics Corp.
Data Sheet
June 2001
Austin Lite Non-Isolated SMT DC - DC Power Modules:
3.3 Vdc and 5.0 Vdc Input, 1.5 Vdc - 3.3 Vdc Output, 5A
Output Regulation
(continued)
Table 2. Output Specifications
Unless otherwise noted, all specifications are defined at nominal line, full load, T
AMBIENT
– 25
°C
Parameter
Output Voltage
These specifications are under all specified
input voltage, load current, and temperature
conditions. They do not include ripple or
transient.
Output Current
*(see Figures 17 – 22 for derating)
Output Ripple
(See Figures 4 — 9)
External Load Capacitance*
Output Current Limit Inception
Efficiency
V
IN
= Nominal, I
OUT
= Maximum
Device
3.3V
2.5V
2.0V
1.8V
1.5V
—
3.3 V
IN
5.0 V
IN
All
All
5.0 – 3.3
5.0 – 2.5
3.3 – 2.5
3.3 – 2.0
3.3 – 1.8
3.3 – 1.5
All
All
—
—
< 10
—
%
µS
Symbol
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
I
OUT
V
RIPPLE
V
RIPPLE
—
I
OUT
η
η
η
η
η
η
F
OP
—
—
—
—
—
—
—
Min
3.20
2.42
1.94
1.74
1.45
0
—
—
—
Typ
3.3
2.5
2.0
1.8
1.5
—
—
—
5000*
7
87
82
86
82
80
75
900
—
—
—
—
—
—
—
Max
3.400
2.58
2.06
1.86
1.55
5
80
100
—
Unit
V
V
V
V
V
A
mVpp
mVpp
µF
A
%
%
%
%
%
%
kHz
Switching Frequency
V
OUT
Dynamic Response to Transient Load
(T
TRANSITION
= 50
µs)
Nominal Load 50% to 100% Peak Deviation
measured as a maximum percentage deviation
from nominal V
O
at full load
Nominal Load 50% to 100% Settling Time to
V
OUT
< 10% of V
OUT STEADY STATE
See Figures 10 – 15
—
—
< 25
—
* units will start into 5000
µ
F, 5A load at nominal line; units will start into 10,000
µ
F with no load
Static Voltage Regulation
The ouput voltage measured at the converter output pins on the system board will be within the range shown in
Table 3, except during turn-on and turn-off. Static voltage regulation includes:
s
s
s
s
s
DC Output initial voltage
Input voltage range
3.0V – 3.6V
4.5V – 5.5V
Load regulation from 0A – 5A
Output Ripple and Noise
Output ripple and noise is defined as periodic or random deviation from the nominal voltage at the output pins while
under constant load and input line. Typical full load output ripple and noise waveforms are shown in Figures 4 – 10.
Tyco Electronics Corp.
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
