SMT15C Series | 15A DC/DC Converter
C Class Non-Isolated
SMT15C SERIES
Single Output
Wide output voltage trim (0.9V - 5.0V, 15A max.)
Power good output signal (open collector)
Input undervoltage lockout
Current sink capability for termination applications
Operating ambient temperature up to 80ºC with suitable derating and forced
ir cooling
Remote ON/OFF
No minimum load requirements
Non-latching overcurrent protection
5V and 12V input options
The SMT15C is a new high density open
frame non-isolated converter series for
space sensitive applications. Each model
has a wide input range (4.5V to 5.5V or
10.2V to 13.8V) and offer a wide 0.9V to
3.3V/5V output voltage range with a 15A
load. An external resistor adjusts the
output voltage from its pre-set value of
0.9V to any value up to the maximum
allowed value for that model. Typical
efficiencies are 89% for the 5V input
version and 91% for the 12V input version.
The SMT15C series offers remote ON/OFF
and overcurrent protection as standard.
With full international safety approval
including EN60950 and UL/cUL60950, the
SMT15C reduces compliance costs and
time to market.
[ 2 YEAR WARRANTY ]
1
File Name: lf_smt15c.pdf Rev: (01): 01 Oct 2004
SMT15C Series | 15A DC/DC Converter
C Class Non-Isolated
Stresses in excess of the maximum ratings can cause permanent damage to the device. Operation of the device is not implied at these or any
other conditions in excess of those given in the specification. Exposure to absolute maximum ratings can adversely affect device reliability.
Absolute Maximum Ratings
Characteristic
Input voltage - continuous
Operating temperature
Symbol
Vin (cont)
Top
Min
-0.3
0
Typ
Max
13.8
50
Units
V DC
ºC
Notes and Conditions
Vin(+) - Vin(-)
Measured at thermal reference
points, see Note 1. Higher
ambient operation possible with
forced air cooling. See de-rating
curves
Storage temperature
Output current
Tstorage
Iout (max)
-40
125
15
ºC
A
All specifications are typical at nominal input Vin =
5V
and 12V, full load under any resistive load combination at 25˚C unless otherwise stated.
Input Characteristics
Characteristic
Input voltage - operating (5V)
(12V)
Input current - no load
(5V)
(12V)
Input current - Quiescent (5V)
(12V)
Input voltage variation
dv/dt
Symbol
Vin (oper)
Vin (oper)
lin
lin (off)
Min
4.5
10.2
Typ
5.0
12.0
35
65
10
3.5
1.2
20
6.5
V/ms
Product was tested at 1.2V/ms.
Much higher dv/dt is possible
(>10V/ms). Consult factory for
details
Max
5.5
13.8
Units
V DC
V DC
mADC
mADC
Vin (min) - Vin (max), enabled
Converter disabled
Notes and Conditions
Turn On/Off
Characteristic
Input voltage - turn on
Input voltage - turn off
Turn on delay - enabled,
then power applied
(5V)
(12V)
(5V)
(12V)
Symbol
Vin (on)
Vin (on)
Vin (off)
Vin (off)
Tdelay
(power)
Min
4.4
9.0
4.2
7.5
Typ
4.5
9.3
4.3
7.8
Max
4.6
9.6
4.4
8.1
20
Units
V DC
V DC
V DC
V DC
msec
With the Remote ON/OFF signal
asserted, this is the time from
when the input voltage reaches
the minimum specified operating
voltage until the Power Good
Turn on delay - power
applied, then Remote ON/OFF
asserted
Output to power good delay
Rise time (5V)
Tdelay
(Remote ON/OFF)
Tdelay
(power good)
Trise
8
10
ms
msec
20
msec
is asserted high
Vin = Vin (nom), then Remote
ON/OFF asserted. This is the
time taken until the power
good is asserted high
Output voltage in full regulation
to power good asserted high
From 10% to 90%; full resistive
load, 680µF capacitance
Notes and Conditions
2
File Name: lf_smt15c.pdf Rev: (01): 01 Oct 2004
SMT15C Series | 15A DC/DC Converter
C Class Non-Isolated
Signal Electrical Interface
Characteristic - Signal Name Symbol
At remote/control ON/OFF pin
Min
Typ
Max
Units
Notes and Conditions
See Notes 2 and 3
See Application Note 169 for
Remote ON/OFF details
Iih = 0 µA; open circuit voltage
Current flowing into control pin
when pin is pulled high
(max. at Vih = 13.8V)
Converter guaranteed on when
control pin is greater than
Vih (min)
Converter guaranteed off
when control pin is
less than Vil (max)
ViI = 0.0 V
Control pin open circuit voltage
High level input current
Vih
Iih
2.27
2.5
1.0
V
µA
High level input voltage
Vih
2.4
V
Low level input voltage
ViI
0.8
V
Low level input current
(5V)
(12V)
Iil (max)
0.13
0.50
µA
µA
Reliability and Service Life
Characteristic
Mean time between failure
Symbol
MTBF
Min
249,928
Typ
Max
Units
Hours
Notes and Conditions
MIL-HDBK-217F,
Vin = Vin (nom); Iout = Iout
(max); ambient 25ºC;
ground benign environment
Telcordia SR-332
Issue 3, ground benign,
temp. = 40ºC, Vin = Vin (nom),
Iout = Iout (max)
Mean time between failure
MTBF
7,817,294
Hours
3
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File Name: lf_smt15c.pdf Rev: (01): 01 Oct 2004
SMT15C Series | 15A DC/DC Converter
C Class Non-Isolated
Other Specifications
Characteristic
Switching frequency
Weight
Symbol
Fsw
Min
Typ
200
14.2
Max
Units
kHz
g
Notes and Conditions
Fixed frequency
Safety Agency Approvals
Characteristic
UL/cUL 60950 File No.
E139421
TÜV Product Service IEC 60950 Certificate No. B 04 08 19870 228
Material Ratings
Characteristic - Signal Name Notes and Conditions
Flammability rating
Material type
UL94V-0
FR4 PCB
Model Numbers
Model
Number
SMT15C-05SADJ
SMT15C-12SADJ
Input
Voltage
4.5V - 5.5V
10.2V - 13.8V
Output
Voltage
0.9V - 3.3V
0.9V - 5.0V
Output Current
(Max.)
15A
15A
Typical
Efficiency
89%
91%
Max. Load
Regulation
±0.5%
±0.5%
4
File Name: lf_smt15c.pdf Rev: (01): 01 Oct 2004
SMT15C Series | 15A DC/DC Converter
C Class Non-Isolated
5V and 12V Model 0.9V Setpoint
Input Characteristics
Characteristic
Input current - operating
(Source)
(5V)
(Sink)
(5V)
(Source)
(12V)
(Sink)
(12V)
Reflected ripple current
(5V)
(5V)
(12V)
Symbol
Min
Typ
Max
Units
Notes and Conditions
Iin
Iin
Iin
Iin
Iin (ripple)
4.03
-1.47
1.66
-0.70
40
150
33
190
4.70
A
A
A
A
DC
DC
DC
DC
Vin = Vin (nom); Iout = Iout (max)
Vin = Vin (nom); Iout = Iout (max)
mA RMS Iout = Iout (max), measured
mA pk-pk with external filter. See
mA RMS Application Note 169 for details
mA pk-pk
µF
(12V)
Input capacitance - internal
filter
Input capacitance -
external input
Cinput
Cbypass
270
µF
Recommended customer
added capacitance.
Maximum ESR = 20mΩ
See Application Note 169 for
ripple current requirements
5V and 12V Model 0.9V Setpoint
Electrical Characteristics - O/P
Characteristic
Nominal set-point voltage
with 1% trim resistors
Line regulation
Symbol
Vo (nom)
Min
0.878
Typ
0.9
Max
0.923
Units
V DC
Notes and Conditions
Vin = Vin (nom); Iout = Iout (max)
Iout = Iout (nom); Vin (min)
to Vin (max)
Vin = Vin (max); Iout (min) to
Iout (max)
Minus indicates sink mode
±0.2
%
Load regulation
±0.5
%
Output current continuous
Output current - short circuit
(5V)
(12V)
Output voltage - noise
(5V) 0.9V
(12V) 0.9V
Iout
0
±15
A DC
Isc
3.90
3.90
Continuous, unit auto recovers
Vp-p
Vrms
Vp-p
Vrms
30
15
50
25
mV pk-pk Measurement bandwidth 20MHz
mV rms
See Application Note 169 for
mV pk-pk measurement set-up details
mV rms
5
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File Name: lf_smt15c.pdf Rev: (01): 01 Oct 2004
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