Preset output voltage is 0.8V; externally adjustable to 2.5V through the Vo,Adjust pin
Pin Descriptions
Vin:
The positive input voltage power node to the module,
which is referenced to common
GND.
Vout:
The regulated positive power output with respect
to the
GND
node.
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.
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 0.1 W 1 % resistor must be directly connected
between this pin and pin 7 (GND) to set the output voltage
to a value higher than 0.8 V. The temperature stability of
the resistor should be 100 ppm/°C (or better). The set
point range for the output voltage is from 0.8 V to 2.5 V.
The resistor value 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 adjust-
ment consult the related application note.
R
set
= 10 k ·
0.8 V
V
out
– 0.8 V
– 2.49 k
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.
Track:
This is an analog control input that enables the
output voltage to follow an external voltage. This pin
becomes active typically 20 ms after the input voltage
has been applied, and allows direct control of the output
voltage from 0 V up to the nominal set-point voltage.
Within this range the output will follow the voltage at
the
Track
pin on a volt-for-volt basis. When the control
voltage is raised above this range, the module regulates
at its set-point voltage. The feature allows the output
voltage to rise simultaneously with other modules pow-
ered from the same input bus. If unused, this input should
be connected to V
in
.
Note: Due to the under-voltage lockout
feature, the output of the module cannot follow its own input
voltage during power up. For more information, consult the
related 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.
North America (USA): 1-888-41-ASTEC
Europe (UK): 44(1384)842-211
Asia (HK): 852-2437-9662
ATH30T033 Series —3.3-V Input
30-A, 3.3-V Input Non-Isolated
Wide-Output Adjust Power Module
REVISION 00 (30APR2004)
Environmental & Absolute Maximum Ratings
Characteristics
Track Input Voltage
Operating T
emperature Range
Solder Reflow Temperature
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
–0.3
–40
–40
—
—
—
—
Typ
—
—
—
500
10
20
10
Max
V
in
+ 0.3
85
235
(i)
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
Suffix S
20-2000 Hz
Suffix H
Meets UL 94V-O
Notes:
(i) During reflow of SMD package version do not elevate peak temperature of the module, pins or internal components above the stated maximum.
Specifications
Characteristics
Typ
Output Current
(Unless otherwise stated, T
a
=25 °C, V
in
=3.3 V, V
out
=2 V, C
in
=1,500 µF, C
out
=0 µF, and I
o
=I
o
max)
Symbols
Max
I
o
V
in
V
o
tol
∆Reg
temp
∆Reg
line
∆Reg
load
∆Reg
tot
η
Input Voltage Range
Set-Point Voltage T
olerance
Temperature Variation
Line Regulation
Load Regulation
Total Output Variation
Efficiency
60 °C, 200 LFM airflow
25 °C, natural convection
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
R
SET
= 2.21 kΩ V
o
=
2.5 V
I
o
=20 A
R
SET
= 4.12 kΩ V
o
=
2.0 V
R
SET
= 5.49 kΩ V
o
=
1.8 V
R
SET
= 8.87 kΩ V
o
=
1.5 V
R
SET
= 17.4 kΩ V
o
=
1.2 V
R
SET
= 36.5 kΩ V
o
=
1.0 V
20 MHz bandwidth
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
C
out
≤
C
out
(max)
V
in
increasing
V
in
decreasing
Referenced to GND
Pin to GND
Inhibit (pin 4) to GND, T
rack (pin 11) open
Over V
in
and I
o
ranges
non-ceramic
ceramic
Equiv. series resistance (non-ceramic)
Per Bellcore TR-332
50 % stress, T
a
=40 °C, ground benign
Capacitance value
0
0
2.95
(2)
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
2.2
V
in
–0.5
–0.2
—
—
275
1,500
(6)
0
0
(9)
4
2.8
ATH30T033
Conditions
Units
—
—
—
—
±0.5
±10
±12
—
93
92
91
89
87
85
30
45
70
100
±5
– 8
(4)
—
—
2.45
2.4
—
—
–130
10
300
—
330
(7)
—
—
—
Min
30
(1)
30
(1)
3.65
±2
(3)
—
—
—
±3
—
—
—
—
—
—
—
—
—
—
—
—
–130
1
2.8
—
Open
0.8
—
—
325
—
16,500
300
—
—
(3)
A
V
%V
o
%V
o
mV
mV
%V
o
%
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
mVpp
A
µSec
mV
%
µA
µA
V/ms
V
(5)
Margin Up/Down Adjust
Margin Input Current (pins 12 /13)
Track Input Current (pin 8)
Track Slew Rate Capability
Under-Voltage Lockout
Inhibit Control (pin4)
Input High Voltage
Input Low Voltage
Input Low Current
Input Standby Current
Switching Frequency
External Input Capacitance
External Output Capacitance
(5)
V
µA
mA
kHz
µF
µF
mΩ
10
6
Hrs
(8)
Reliability
MTBF
Notes:
(1) See SOA curves or consult factory for appropriate derating.
(2) The minimum input voltage is equal to 2.95 V or Vout + 0.5 V, whichever is greater.
(3) 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.
(4) A small low-leakage (<100 nA) MOSFET is recommended to control this pin. The open-circuit voltage is less than 1 Vdc.
(5) This control pin has an internal pull-up to the input voltage Vin. 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.
(6) A 1,500 µF electrolytic input capacitor is required for proper operation. The capacitor must be rated for a minimum of 900 mA rms of ripple current.
(7) An external output capacitor is not required for basic operation. Adding 330 µF of distributed capacitance at the load will improve the transient response.
(8) This is the calculated maximum. The minimum ESR limitation will often result in a lower value. Consult the application notes for further guidance.
(9) This is the typical ESR for all the electrolytic (non-ceramic) output capacitance. Use 7 m
Ω
as the minimum when using max-ESR values to calculate.
North America (USA): 1-888-41-ASTEC
Europe (UK): 44(1384)842-211
Asia (HK): 852-2437-9662
ATH30T033 Series —3.3-V Input
30-A, 3.3-V Input Non-Isolated
Wide-Output Adjust Power Module
Typical Characteristics
REVISION 00 (30APR2004)
Characteristic Data; V
in
=3.3V
Efficiency vs Load Current
100
(See Note A)
Safe Operating Area; V
in
=3.3 V
All Output Voltages
90
80
(See Note B)
V
OUT
2.5 V
2.0 V
1.8 V
1.5 V
1.2 V
0.8 V
Ambient Temperature (°C)
90
70
60
50
40
30
Airflow
400LFM
200LFM
100LFM
Nat Conv
Efficiency - %
80
70
60
50
0
5
10
15
20
25
30
20
0
5
10
15
20
25
30
Iout - Amps
Iout (A)
Output Ripple vs Load Current
50
40
V
OUT
2.0 V
1.5 V
1.8 V
1.2 V
0.8 V
2.5 V
Ripple - mV
30
20
10
0
0
5
10
15
20
25
30
Iout (A)
Power Dissipation vs Load Current
10
8
Pd - Watts
6
4
2
0
0
5
10
15
20
25
30
Iout - Amps
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
ATH30T033 & ATH30T05 Series
Capacitor Recommendations for
the ATH30T033 &
ATH30T05 Series of Power Modules
Input Capacitor
The recommended input capacitor(s) is determined by
the 1,500 µF
(1)
minimum capacitance and 900 mArms
minimum ripple current rating.
Ripple current and <100 mΩ equivalent series resistance
(ESR) values are the major considerations, along with
temperature, when designing with different types of
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