Preset output voltage is 1.2V; externally adjustable to 5.5V
Pin Descriptions
GND:
This is the common ground connection for the
Vin
and
Vout
power connections. It is also the 0 VDC
reference for the control inputs.
Vin:
The positive input voltage power node to the mod-
ule, which is referenced to common
GND.
Inhibit:
The Inhibit pin is an open-collector/drain negative
logic input that is referenced to
GND.
Applying a low-
level ground signal to this input disables the module’s
output and turns off the output voltage. When the
Inhibit
control is active, the input current drawn by the regula-
tor is significantly reduced. If the
Inhibit
pin is left
open-circuit, the module will produce an output when-
ever a valid input source is applied.
Vo Adjust:
A 1 % 0.1 W resistor must be directly connected
between this pin and pin 7 (GND) to set the output voltage
to a value higher than 1.2 V. The temperature stability
of the resistor should be 100 ppm/°C or better. The set
point range is from 1.2 V to 5.5 V. The resistor required
for a given output voltage may be calculated from the
following formula. If left open circuit the output voltage
will default to its lowest value. For further information
on output voltage adjustment consult the related applica-
tion note.
R
set
= 10 kΩ ·
0.8 V
V
out
– 1.2 V
– 1.82 kΩ
Vo Sense:
The sense input allows the regulation circuit to
compensate for voltage drop between the module and
the load. For optimal voltage accuracy
Vo Sense
should be
connected to
Vout.
It can also be left disconnected.
Vout:
The regulated positive power output with respect
to the
GND
node.
Track:
This is an analog control input that allows the
output voltage to follow another voltage during power-
up and power-down sequences. The pin is active from
0 V up to the nominal set-point voltage. Within this
range the module’s output will follow the voltage at the
Track
pin on a volt-for-volt basis. When the control volt-
age is raised above this range, the module regulates at its
nominal output voltage. If unused, this input maybe left
unconnected. For further information consult the re-
lated application note.
Margin Down:
When this input is asserted to
GND,
the
output voltage is decreased by 5% from the nominal. The
input requires an open-collector (open-drain) interface.
It is not TTL compatible. A lower percent change can
be accomodated with a series resistor. For further infor-
mation, consult the related application note.
Margin Up:
When this input is asserted to
GND,
the
output voltage is increased by 5%. The input requires an
open-collector (open-drain) interface. It is not TTL
compatible. The percent change can be reduced with a
series resistor. For further information, consult the
related application note.
The specification table gives the preferred resistor values
for a number of standard output voltages.
** Auto-Track is a trademark of Texas Instruments, Inc.
North America (USA): 1-888-41-ASTEC
Europe (UK): 44(1384)842-211
Asia (HK): 852-2437-9662
ATH12K12 Series —12-V Input
12-A, 12-V Input Non-Isolated
Wide-Output Adjust Power Module
REVISION 00 (30SEP2003)
Environmental & Absolute Maximum Ratings
Characteristics
Track Input Voltage
Operating T
emperature Range
Solder Reflow T
emperature
Storage T
emperature
Mechanical Shock
Mechanical Vibration
Weight
Flammability
—
—
Symbols
V
track
T
a
T
reflow
T
s
(Voltages are with respect to GND)
Min
–0.2
–40
(i)
–40
—
—
—
Typ
—
—
—
500
20
5
Max
V
in
85
215
(ii)
125
—
—
—
Units
V
°C
°C
°C
G’s
G’s
grams
Conditions
Over V
in
Range
Surface temperature of module body or pins
—
Per Mil-STD-883D, Method 2002.3
1 msec, ½ Sine, mounted
Mil-STD-883D, Method 2007.2
20-2000 Hz
Meets UL 94V-O
Notes:
(i) For operation below 0 °C the external capacitors must have stable characteristics. Use either a low-ESR tantalum, Os-Con, or ceramic capacitor.
(ii) During reflow of SMD package version do not elevate peak temperature of the module, pins or internal components above the stated maximum. For
further guidance refer to the application note, “Reflow Soldering Requirements for Plug-in Power Surface Mount Products.”
Specifications
Characteristics
Output Current
(Unless otherwise stated, T
a
=25 °C, V
in
=12 V, V
out
=3.3 V, C
in
=560 µF, C
out
=0 µF, and I
o
=I
o
max)
Symbols
I
o
V
in
V
o
tol
∆Reg
temp
∆Reg
line
∆Reg
load
∆Reg
tot
η
Conditions
1.2 V
≤
V
o
≤
5.5 V
Over I
o
range
–40 °C <T
a
< +85 °C
Over V
in
range
Over I
o
range
Includes set-point, line, load,
–40 °C
≤
T
a
≤
+85 °C
I
o
=8 A
R
SET
= 280
Ω
V
o
=
5.0 V
R
SET
= 2.0 kΩ V
o
=
3.3 V
R
SET
= 4.32 kΩ V
o
=
2.5 V
R
SET
= 8.06 kΩ V
o
=
2.0 V
R
SET
= 11.5 kΩ V
o
=
1.8 V
R
SET
= 24.3 kΩ V
o
=
1.5 V
R
SET
= open cct V
o
=
1.2 V
20 MHz bandwidth
V
o
≤2.5
V
V
o
>2.5
V
Reset, followed by auto-recovery
1 A/µs load step, 50 to 100 % I
o
max,
C
out
=330 µF
Recovery Time
V
o
over/undershoot
Pin to GND
Pin to GND
V
track
– V
o
≤
50 mV and V
track
< V
o
(nom)
V
in
increasing
V
in
decreasing
Referenced to GND
Pin to GND
Inhibit (pin 3) to GND, Track (pin 8) open
Over V
in
and I
o
ranges
60 °C, 200 LFM airflow
25 °C, natural convection
Min
0
0
10.8
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
5
—
8.8
V
in
–0.5
–0.2
—
—
300
560
(5)
0
6.4
ATH12K12
Typ
—
—
—
—
±0.5
±10
±12
—
94
93
91
90
89
88
86
25
1
20
70
100
±5
– 8
(3)
—
—
9.5
9
—
—
–0.24
10
350
—
330
(6)
—
Max
12
(1)
12
(1)
13.2
±2
(2)
—
—
—
±3 (
2)
—
—
—
—
—
—
—
—
—
—
—
—
—
—
–0.13
—
10.4
—
Units
A
V
%V
o
%V
o
mV
mV
%V
o
Input Voltage Range
Set-Point Voltage T
olerance
T
emperature Variation
Line Regulation
Load Regulation
T
otal Output Variation
Efficiency
%
V
o
Ripple (pk-pk)
Over-Current Threshold
Transient Response
V
r
I
o
trip
t
tr
∆V
tr
V
o
adj
I
IL
margin
I
IL
track
dV
track
/dt
UVLO
V
IH
V
IL
I
IL
inhibit
I
in
inh
ƒ
s
C
in
C
out
MTBF
mVpp
% V
o
A
µSec
mV
%
µA
mA
V/ms
V
V
mA
mA
kHz
µF
µF
10
6
Hrs
Margin Up/Down Adjust
Margin Input Current (pins 9 /10)
Track Input Current (pin 8)
Track Slew Rate Capability
Under-Voltage Lockout
Inhibit Control (pin3)
Input High Voltage
Input Low Voltage
Input Low Current
Input Standby Current
Switching Frequency
External Input Capacitance
External Output Capacitance
Reliability
(4)
Open
(4)
0.5
—
—
400
—
10,000
—
Per Bellcore TR-332
50 % stress, T
a
=40 °C, ground benign
Notes:
(1) See SOA curves or consult factory for appropriate derating.
(2) The set-point voltage tolerance is affected by the tolerance and stability of R
SET
. The stated limit is unconditionally met if R
SET
has a tolerance of 1 %,
with 100 ppm/°C (or better) temperature stability.
(3) A small low-leakage (<100 nA) MOSFET is recommended to control this pin. The open-circuit voltage is less than 1 Vdc.
(4) This control pin has an internal pull-up to the input voltage Vin (7.5 V for pin 8). If it is left open-circuit the module will operate when input power is
applied. A small low-leakage (<100 nA) MOSFET is recommended for control. For further information, consult the related application note.
(5) A 560 µF electrolytic input capacitor are required for proper operation. The electrolytic capacitor must be rated for a minimum of 800 mA rms of ripple
current. For further information, consult the related application note regarding capacitor selection.
(6) An external output capacitor is not required for basic operation. Adding 330 µF of distributed capacitance at the load will improve the transient response.
North America (USA): 1-888-41-ASTEC
Europe (UK): 44(1384)842-211
Asia (HK): 852-2437-9662
ATH12K12 Series —12-V Input
12-A, 12-V Input Non-Isolated
Wide-Output Adjust Power Module
Typical Characteristics
REVISION 00 (30SEP2003)
Characteristic Data; V
in
=12 V
Efficiency vs Load Current
100
(See Note A)
Safe Operating Area; V
in
=12 V
Output Voltage =5 V
90
80
(See Note B)
Ambient Temperature (°C)
90
V
OUT
5.0 V
3.3 V
2.5 V
2.0 V
1.8 V
1.5 V
1.2 V
70
60
50
40
30
Airflow
400LFM
200LFM
100LFM
Nat conv
Efficiency - %
80
70
60
50
0
2
4
6
8
10
12
20
0
2
4
6
8
10
12
Iout - Amps
Iout (A)
Output Ripple vs Load Current
100
90
80
Output Voltage =3.3 V
V
OUT
5.0 V
3.3 V
2.5 V
2.0 V
1.8 V
1.5 V
1.2 V
Ambient Temperature (°C)
80
70
60
50
40
30
Airflow
400LFM
200LFM
100LFM
Nat conv
Ripple - mV
60
40
20
0
0
2
4
6
8
10
12
20
0
2
4
6
8
10
12
Iout - Amps
Iout (A)
Power Dissipation vs Load Current
5
90
80
Output Voltage
≤1.8
V
V
OUT
5.0 V
3.3 V
2.5 V
2.0 V
1.8 V
1.5 V
1.2 V
Ambient Temperature (°C)
4
70
60
50
40
30
Airflow
400LFM
200LFM
100LFM
Nat conv
Pd - Watts
3
2
1
0
0
2
4
6
8
10
12
20
0
2
4
6
8
10
12
Iout - Amps
Iout (A)
Note A:
Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter.
Note B:
SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures. Derating limits apply to
modules soldered directly to a 4 in.
×
4 in. double-sided PCB with 1 oz. copper.
North America (USA): 1-888-41-ASTEC
Europe (UK): 44(1384)842-211
Asia (HK): 852-2437-9662
Application Notes
ATH12K12 Series
Adjusting the Output Voltage of the ATH12K12
Wide-Output Adjust Power Module
The
V
o
Adjust
control (pin 4) is used to set the output
voltage to a value higher than 1.2 V. The adjustment
method requires the addition of a single external resistor,
R
set
, that must be connected directly between the
V
o
Adjust
and
GND
pins
1
. Table 1-1 gives the preferred value for
the external resistor for a number of standard voltages,
along with the actual output voltage that this resistance
value provides.
For other output voltages the value of the required resistor
can either be calculated using the following formula, or
simply selected from the range of values given in Table 1-2.
Figure 1-1 shows the placement of the required resistor.
R
set
= 10 kΩ ·
0.8 V
V
out
– 1.2 V
– 1.82 kΩ
Table 1-2; Output Voltage Set-Point Resistor Values
V
a
Req’d
1.200
1.225
1.250
1.275
1.300
1.325
1.350
1.375
1.400
1.425
1.450
1.475
1.50
1.55
1.60
1.65
1.70
1.75
1.80
1.85
1.90
1.95
2.00
2.05
2.10
2.15
2.20
2.25
2.30
2.35
2.40
2.45
2.50
2.55
2.60
2.65
2.70
R
set
Open
318 kΩ
158 kΩ
105 kΩ
78.2 kΩ
62.2 kΩ
51.5 kΩ
43.9 kΩ
38.2 kΩ
33.7 kΩ
30.2 kΩ
27.3 kΩ
24.8 kΩ
21 kΩ
18.2 kΩ
16 kΩ
14.2 kΩ
12.7 kΩ
11.5 kΩ
10.5 kΩ
9.61 kΩ
8.85 kΩ
8.18 kΩ
7.59 kΩ
7.07 kΩ
6.6 kΩ
6.18 kΩ
5.8 kΩ
5.45 kΩ
5.14 kΩ
4.85 kΩ
4.85 kΩ
4.33 kΩ
4.11 kΩ
3.89 kΩ
3.7 kΩ
3.51 kΩ
V
a
Req’d
2.75
2.80
2.85
2.90
2.95
3.00
3.05
3.10
3.15
3.20
3.25
3.30
3.35
3.40
3.45
3.50
3.55
3.6
3.7
3.8
3.9
4.0
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
5.0
5.1
5.2
5.3
5.4
5.5
R
set
3.34 kΩ
3.18 kΩ
3.03 kΩ
2.89 kΩ
2.75 kΩ
2.62 kΩ
2.5 kΩ
2.39 kΩ
2.28 kΩ
2.18 kΩ
2.08 kΩ
1.99 kΩ
1.9 kΩ
1.82 kΩ
1.74 kΩ
1.66 kΩ
1.58 kΩ
1.51 kΩ
1.38 kΩ
1.26 kΩ
1.14 kΩ
1.04 kΩ
939
Ω
847
Ω
761
Ω
680
Ω
604
Ω
533
Ω
466
Ω
402
Ω
342
Ω
285
Ω
231
Ω
180
Ω
131
Ω
85
Ω
41
Ω
Table 1-1; Preferred Values of R
set
for Standard Output Voltages
V
out
(Standard)
5V
3.3 V
2.5 V
2V
1.8 V
1.5 V
1.2 V
R
set
(Pref’d Value)
280
Ω
2 kΩ
4.32 kΩ
8.06 kΩ
11.5 kΩ
24.3 kΩ
Open
V
out
(Actual)
5.009 V
3.294V
2.503 V
2.010V
1.801 V
1.506 V
1.200 V
Figure 1-1; V
o
Adjust Resistor Placement
V
o
Sense
10
9
8
5
6
V
IN
2
ATH12K12-9S
PTH12010W
3
1
7
4
V
OUT
GND
North America (USA): 1-888-41-ASTEC
+
C
IN
560 µF
(Required)
R
SET
1%
0.1 W
C
OUT
330 µF
(Optional)
Notes:
1. Use a 0.1 W resistor. The tolerance should be 1 %, with
temperature stability of 100 ppm/°C (or better). Place
the resistor as close to the regulator as possible. Connect
the resistor directly between pins 4 and 7 using dedicated
