Astec ATH30T05-9J 30-a, 5-v input non-isolated wide-output adjust power module Datasheet

ATH30T05 Series —5-V Input
30-A, 5-V Input Non-Isolated
Wide-Output Adjust Power Modules
REVISION 00 (30APR2004)
Features
NOMINAL SIZE =
• Up to 30 A Output Current
• 5-V Input Voltage
• Wide-Output Voltage Adjust
(0.8 V to 3.6 V)
• 180 W/in³ Power Density
• On/Off Inhibit
• Efficiencies up to 94 %
• Pre-Bias Startup
• Margin Up/Down Controls
• Under-Voltage Lockout
1.37 in x 1.12 in
(34,8 mm x 28,5 mm)
• Auto-Track™ Sequencing
• Output Over-Current Protection
(Non-Latching, Auto-Reset)
• Over-Temperature Protection
• Operating Temp: –40 to +85 °C
• Safety Agency Approvals:
UL 1950, CSA 22.2 950, EN60950
VDE (Pending)
• Point-of-Load Alliance (POLA)
Compatible
Description
Pin Configuration
to any value over the range 0.8 V to 3.6 V,
using a single resistor.
This series includes Auto-Track™.
Auto-Track simplifies power-up and
power-down supply voltage sequencing
in a system by enabling modules to track
each other, or any other external voltage.
Each model also includes an on/off
inhibit, output voltage adjust (trim), and
margin up/down controls. An output
voltage sense ensures tight load regulation,
and an output over-current and thermal
shutdown feature provide for protection
against external load faults.
Package options inlude both throughhole and surface mount configurations.
The ATH30T05 is a series of highcurrent non-isolated power modules.
This product is characterized by high efficiencies, and up to 30 A of output current,
while occupying a mere 1.64 in² of PCB
area. In terms of cost, size, and performance, the series provides OEM’s with a
flexible module that meets the requirements of the most complex and demanding
mixed-signal applications. These include
the most densly populated, multi-processor systems that incorporate high-speed
DSP’s, microprocessors, and ASICs.
The series uses double-sided surface
mount construction and provides highperformance step-down power conversion
from a 5-V input bus voltage. The output voltage of the ATH30T05 can be set
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
Function
GND
Vin
GND
Inhibit *
Vo Adjust
Vo Sense
GND
Vout
Vout
GND
Track
Margin Down *
Margin Up *
* Denotes negative logic:
Open
= Normal operation
Ground = Function active
ack™
r
T
o
t
Au
ncing
e
u
q
e
S
Standard Application
Track
Rset = Required to set the output voltage to a value
higher than 0.8 V. (see spec. table for values).
Cin = Required 1,500 µF capacitor.
Cout = Optional 330 µF capacitor.
Margin Down
Margin Up
13
12
11
1
VIN
2
10
9
PTH05030W
ATH30T05-9S
(Top View)
VOUT
8
3
7
4
5
6
Inhibit
Vo Sense
+
RSET
0.5 %, 0.1 W
(Required)
COUT
330 µF
(Optional)
GND
North America (USA): 1-888-41-ASTEC
L
O
A
D
+
CIN
1,500 µF
(Required)
GND
Europe (UK): 44(1384)842-211
Asia (HK): 852-2437-9662
ATH30T05 Series —5-V Input
30-A, 5-V Input Non-Isolated
Wide-Output Adjust Power Modules
REVISION 00 (30APR2004)
Ordering Information
Input Voltage
Output Voltage
4.5V to 5.5V
0.8V1 to 3.6V
Options:
“-J”
“-SJ”
-
Output Current
Model Number
30A
ATH30T05-9(S)(J)
Through-hole Termination, Tray Packaging
SMT Termination, Tray Packaging
Notes:
1
Preset output voltage is 0.8V; externally adjustable to 3.6V 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 lowlevel 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 regulator is significantly reduced. If the Inhibit pin is left
open-circuit, the module will produce an output whenever 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 3.6 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 adjustment consult the related application note.
Rset
= 10 k ·
0.8 V
Vout – 0.8 V
– 2.49 k
The specification table gives the preferred resistor values
for a number of standard output voltages.
North America (USA): 1-888-41-ASTEC
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 powered from the same input bus. If unused, this input should
be connected to Vin. 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 information, 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.
Europe (UK): 44(1384)842-211
Asia (HK): 852-2437-9662
ATH30T05 Series —5-V Input
30-A, 5-V Input Non-Isolated
Wide-Output Adjust Power Modules
REVISION 00 (30APR2004)
Environmental & Absolute Maximum Ratings
Characteristics
Symbols
Track Input Voltage
Operating Temperature Range
Solder Reflow Temperature
Storage Temperature
Mechanical Shock
Vtrack
Ta
Treflow
Ts
Mechanical Vibration
Weight
Flammability
—
—
(Voltages are with respect to GND)
Conditions
Over Vin 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
Min
Typ
–0.3
–40
—
—
Max
Units
Vin + 0.3
85
235 (i)
125
V
°C
°C
°C
–40
—
—
500
—
G’s
—
—
—
10
20
10
—
—
—
grams
G’s
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
(Unless otherwise stated, Ta =25 °C, V in =5 V, Vout =3.3 V, Cin =1,500 µF, C out =0 µF, and Io =Iomax)
ATH30T05
Typ
Characteristics
Symbols
Conditions
Min
Output Current
Io
Input Voltage Range
Set-Point Voltage Tolerance
Temperature Variation
Line Regulation
Load Regulation
Total Output Variation
Vin
Vo tol
∆Regtemp
∆Regline
∆Regload
∆Regtot
60 °C, 200 LFM airflow
25 °C, natural convection
Over Io range
0
0
4.5
—
—
—
—
—
—
—
—
±0.5
±10
±12
30
30
5.5
±2
—
—
—
—
—
±3
Efficiency
η
—
—
—
—
—
—
—
—
94
93
90
89
87
86
40
47
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
3.4
70
100
±5
– 8 (3)
—
—
4.3
3.7
—
—
—
—
–130
1
4.45
—
Vin –0.5
–0.2
—
—
275
1,500 (5)
0
0
(8)
4
—
—
–130
10
300
—
330 (6)
—
—
Open
0.8
—
—
235
—
16,500
300
—
2.8
—
Vo Ripple (pk-pk)
Over-Current Threshold
Transient Response
Vr
Io trip
Margin Up/Down Adjust
Margin Input Current (pins 12 /13)
Track Input Current (pin 11)
Track Slew Rate Capability
Under-Voltage Lockout
ttr
∆Vtr
Vo adj
IIL margin
IIL track
dVtrack/dt
UVLO
Inhibit Control (pin4)
Input High Voltage
Input Low Voltage
Input Low Current
VIH
VIL
IIL inhibit
Input Standby Current
Switching Frequency
External Input Capacitance
External Output Capacitance
Iin inh
ƒs
Cin
Cout
Reliability
MTBF
–40 °C <Ta < +85 °C
Over Vin range
Over Io range
Includes set-point, line, load,
–40 °C ≤ T a ≤ +85 °C
RSET = 698 Ω Vo = 3.3 V
Io =20 A
RSET = 2.21 kΩ Vo = 2.5 V
RSET = 5.49 kΩ Vo = 1.8 V
RSET = 8.87 kΩ Vo = 1.5 V
RSET = 17.4 kΩ Vo = 1.2 V
RSET = 36.5 kΩ Vo = 1.0 V
20 MHz bandwidth
Reset, followed by auto-recovery
1 A/µs load step, 50 to 100 % Iomax,
Cout =330 µF
Recovery Time
Vo over/undershoot
Pin to GND
Pin to GND
Cout ≤ Cout(max)
Vin increasing
Vin decreasing
Referenced to GND
Pin to GND
Inhibit (pin 4) to GND, Track (pin 11) open
Over Vin and Io ranges
Capacitance value
non-ceramic
ceramic
Equiv. series resistance (non-ceramic)
Per Bellcore TR-332
50 % stress, Ta =40 °C, ground benign
Max
—
Units
(1)
(1)
(2)
A
V
%Vo
%Vo
mV
mV
%Vo
%
mVpp
A
(4)
µSec
mV
%
µA
µA
V/ms
V
(4)
(7)
V
µA
mA
kHz
µF
µF
mΩ
106 Hrs
Notes: (1) See SOA curves or consult factory for appropriate derating.
(2) The set-point voltage tolerlance is affected by the tolerance and stability of R SET . The stated limit is unconditionally met if RSET 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. 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 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.
(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.
(7) This is the calculated maximum. The minimum ESR limitation will often result in a lower value. Consult the application notes for further guidance.
(8) This is the typical ESR for all the electrolytic (non-ceramic) output capacitance. Use 7 mΩ 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
ATH30T05 Series —5-V Input
Typical Characteristics
30-A, 5-V Input Non-Isolated
Wide-Output Adjust Power Modules
Characteristic Data; Vin =5 V
REVISION 00 (30APR2004)
Safe Operating Area; Vin =5 V
(See Note A)
Efficiency vs Load Current
(See Note B)
All Output Voltages
100
90
Efficiency - %
VOUT
3.3
80
2.5
1.8
1.2
70
0.8
60
Ambient Temperature (°C)
80
90
Airflow
70
400LFM
60
200LFM
100LFM
50
Nat Conv
40
30
50
20
0
5
10
15
20
25
30
0
5
Iout - Amps
10
15
20
25
30
Iout (A)
Output Ripple vs Load Current
100
Ripple - mV
80
VOUT
2.5
60
1.8
3.3
1.2
40
0.8
20
0
0
5
10
15
20
25
30
Iout (A)
Power Dissipation vs Load Current
10
Pd - Watts
8
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
capacitors. Unlike polymer tantalum, conventional tantalum capacitors have a recommended minimum voltage
rating of 2 × (maximum DC voltage + AC ripple). This
is standard practice to ensure reliability.
For improved ripple reduction on the input bus, ceramic
capacitors may be used to complement electrolytic types
and achieve the minimum required capacitance.
Output Capacitors (Optional)
For applications with load transients (sudden changes in
load current), regulator response will benefit from an
external output capacitance. The recommended output
capacitance of 330 µF will allow the module to meet
its transient response specification (see product data sheet).
For most applications, a high quality computer-grade
aluminum electrolytic capacitor is most suitable. These
capacitors provide adequate decoupling over the frequency
range, 2 kHz to 150 kHz, and are suitable when ambient
temperatures are above 0 °C. For operation below 0 °C,
tantalum, ceramic or Os-Con type capacitors are recommended. When using one or more non-ceramic capacitors,
the calculated equivalent ESR should be no lower than
4 mΩ (7 mΩ using the manufacturer’s maximum ESR
for a single capacitor). A list of preferred low-ESR type
capacitors are identified in Table 1-1.
Ceramic Capacitors
Above 150 kHz the performance of aluminum electrolytic
capacitors becomes less effective. To further improve the
reflected input ripple current or the output transient
response, multilayer ceramic capacitors can also be added.
Ceramic capacitors have very low ESR and their resonant
frequency is higher than the bandwidth of the regulator.
When used on the output their combined ESR is not
critical as long as the total value of ceramic capacitance
does not exceed 300 µF. Also, to prevent the formation of
local resonances, do not place more than five identical ceramic capacitors in parallel with values of 10 µF or greater.
Tantalum Capacitors
Tantalum type capacitors can be used at both the input
and output, and are recommended for applications where
the ambient operating temperature can be less than 0 °C.
The AVX TPS, Sprague 593D/594/595 and Kemet T495/
T510 capacitor series are suggested over many other
tantalum types due to their higher rated surge, power
North America (USA): 1-888-41-ASTEC
dissipation, and ripple current capability. As a caution
many general purpose tantalum capacitors have considerably higher ESR, reduced power dissipation and lower
ripple current capability. These capacitors are also less
reliable when determining their power dissipation and
surge current capability. Tantalum capacitors that do
not have a stated ESR or surge current rating are not
recommended for power applications.
When specifying Os-Con and polymer tantalum capacitors
for the output, the minimum ESR limit will be encountered well before the maximum capacitance value is
reached.
Capacitor Table
Table 1-1 identifies the characteristics of capacitors from a
number of vendors with acceptable ESR and ripple current
(rms) ratings. The recommended number of capacitors
required at both the input and output buses is identified
for each capacitor type.
This is not an extensive capacitor list. Capacitors from other
vendors are available with comparable specifications. Those
listed are for guidance. The RMS ripple current rating and
ESR (at 100kHz) are critical parameters necessary to insure
both optimum regulator performance and long capacitor life.
Designing for Very Fast Load Transients
The transient response of the DC/DC converter has been
characterized using a load transient with a di/dt of 1 A/µs.
The typical voltage deviation for this load transient is
given in the data sheet specification table using the
optional value of output capacitance. As the di/dt of a
transient is increased, the response of a converter’s regulation circuit ultimately depends on its output capacitor
decoupling network. This is an inherent limitation with
any DC/DC converter once the speed of the transient
exceeds its bandwidth capability. If the target application
specifies a higher di/dt or lower voltage deviation, the
requirement can only be met with additional output
capacitor decoupling. In these cases special attention
must be paid to the type, value and ESR of the capacitors
selected.
If the transient performance requirements exceed that
specified in the data sheet, or the total amount of load
capacitance is above 3,000 µF, the selection of output
capacitors becomes more important. For further guidance
consult the separate application note, “Selecting Capacitors for PTH Products in High-Performance Applications.”
Europe (UK): 44(1384)842-211
Asia (HK): 852-2437-9662
Application Notes continued
ATH30T033 & ATH30T05 Series
Table 1-1: Input/Output Capacitors
Capacitor Vendor, Type:
Series (Style)
Capacitor Characteristics
Quantity
Working
Voltage
Value
(µF)
Max. ESR
at 100 kHz
Max. Ripple
Current @85 °C
(I rms)
Physical Size
(mm)
Input
Bus
Output
Bus
10 V
16 V
16 V
10 V
560
1500
1500
2200
0.090 Ω
0.043 Ω
0.060 Ω
0.060 Ω
>900 mA
1690 mA
1100 mA
1100 mA
10×12.5
16×15
12.5×13.5
12.5×13.5
3
1
1
1
1
1
1
1
6.3 V
6.3 V
10 V
10 V
1000
820
680
1000
0.013 Ω
0.010 Ω
0.090 Ω
0.068 Ω
4935 mA
5500 mA
>900 mA
1050 mA
10×10.5
10×12.2
10×12.5
10×16
2
2
3
2
≤2
≤2
1
1
Nichicon, Aluminum:
HD (Radial)
PM (Radial)
6.3 V
10 V
1000
1500
0.053 Ω
0.050 Ω
1030 mA
1060 mA
10×12.5
16×15
2
1
1
1
Sanyo, Os-con:
SP (Radial)
SVP (SMD)
10 V
6.3 V
470
820
0.015 Ω
0.012 Ω
>4500 mA
>5440 mA
10×10.5
10×12.7
3 [1]
2
Panasonic, Poly-Aluminum:
WA (SMD)
S/SE (SMD)
6.3 V
6.3 V
560
180
0.020 Ω
0.005 Ω
5100 mA
4000 mA
10×10.2
7.3×4.3×4.2
10 V
10 V
470
470
0.045 Ω
0.060 Ω
1723 mA
1826 mA
7.3L
×5.7W×4.1H
6.3 V
10 V
6.3 V
470
330
470
0.018 Ω
0.015 Ω
0.012 Ω
>1200 mA
>3800 mA
4200 mA
10 V
16 V
470
2200
0.100 Ω
0.015 Ω
1440 mA
9740 mA
Kemet, Ceramic X5R (SMD)
16 V
6.3 V
10
47
0.002 Ω
0.002 Ω
Murata, Ceramic X5R (SMD)
6.3 V
6.3 V
16 V
16 V
100
47
22
10
TDK, Ceramic X5R (SMD)
6.3 V
6.3 V
16 V
16 V
100
47
22
10
Panasonic:
FC (Radial)
FK (SMD)
United Chemi-con
FX, Oscon (Radial)
PXA, (Poly-Aluminum (SMD.)
LXZ, Aluminum (Radial)
AVX, Tantalum:
TPS (SMD)
Kemet (SMD):
T520, Poly-Tant
T530, Poly-Tant/Organic
Vishay-Sprague
595D, Tantalum (SMD)
94SA, Os-con (Radial)
Vendor Part Number
EEUFC1A561
EEUFC1C152S
EEVFK1C152Q
EEVFK1A222Q
6FX1000M
PXA6.3VC820MJ12TP
LXZ10VB681M10X12LL
LXZ10VB102M10X16LL
UHD0J102MPR
UPM1A152MHH6
≤3
≤2
10SP470M
6SVP820M
≤4
≤1
EEFWA0J561P
EEFSE0J181R
3 [ 1]
3 [ 1]
≤5
≤5
TPSE477M010R0045
TPSV477M010R0060
4.3W
×7.3L
×4.0H
3 [ 1]
5
3 [ 1]
≤5
≤3
≤2
T520X477M006SE018
T530X337M010AS
T530X477M006AS
7.2L×6W
×4.1H
16×25
3 [ 1]
1
≤5
≤3
595D477X0010R2T
94SA108X0016HBP
—
1210 case
3225 mm
1 [ 2]
1 [ 2]
≤5
≤5
C1210C106M4PAC
C1210C476K9PAC
0.002 Ω
—
1210 case
3225 mm
1 [ 2]
1 [ 2]
1 [ 2]
≤3
≤5
≤5
≤5
GRM32ER60J107M
GRM32ER60J476M
GRM32ER61C226K
GRM32DR61C106K
0.002 Ω
—
1210 case
3225 mm
1 [ 2]
1 [ 2]
1 [ 2]
≤3
≤5
≤5
≤5
C3225X5R0J107MT
C3225X5R0J476MT
C3225X5R1C226MT
C3225X5R1C106MT
3
N/ R
[1] The total capacitance is slightly lower than 1,500 µF, but is acceptable based on the combined ripple current rating.
[2] A ceramic capacitor may be used to complement electrolytic types at the input to further reduce high-frequency ripple current
North America (USA): 1-888-41-ASTEC
Europe (UK): 44(1384)842-211
Asia (HK): 852-2437-9662
Application Notes
ATH30T033 & ATH30T05 Series
Adjusting the Output Voltage of the ATH30T033
& ATH30T05 Wide-Output Adjust Power Modules
The Vo Adjust control (pin 4) sets the output voltage of the
ATH30T033 and ATH30T05 products to a value higher than
0.8 V. The adjustment range of the ATH30T033 (3.3-V
input) is from 0.8 V to 2.5 V 1, and the ATH30T05 (5-V input)
from 0.8 V to 3.6 V. For an output voltage other than
0.8 V a single external resistor, Rset, must be connected
directly between the Vo Adjust and GND pins 2. Table 2-1
gives the preferred value of 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 2-2.
Figure 2-1 shows the placement of the required resistor.
Rset
= 10 kΩ ·
0.8 V
Vout – 0.8 V
– 2.49 kΩ
Table 2-1; Preferred Values of Rset for Standard Output Voltages
Vout (Standard)
Rset (Pref’d Value)
3.3 V 1
2.5 V
2V
1.8 V
1.5 V
1.2 V
1V
0.8 V
698 Ω
2.21 kΩ
4.12 kΩ
5.49 kΩ
8.87 kΩ
17.4 kΩ
36.5 kΩ
Open
Vout (Actual)
3.309V
2.502 V
2.010 V
1.803 V
1.504 V
1.202 V
1.005 V
0.8 V
Figure 2-1; Vo Adjust Resistor Placement
Vo Sense
13
12
11
Table 2-2; Output Voltage Set-Point Resistor Values
Va Req’d
0.800
0.825
0.850
0.875
0.900
0.925
0.950
0.975
1.000
1.025
1.050
1.075
1.100
1.125
1.150
1.175
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
Rset
Va Req’d
Open
318 kΩ
158 kΩ
104 kΩ
77.5 kΩ
61.5 kΩ
50.8 kΩ
43.2 kΩ
37.5 kΩ
33.1 kΩ
29.5 kΩ
26.6 kΩ
24.2 kΩ
22.1 kΩ
20.4 kΩ
18.8 kΩ
17.5 kΩ
16.3 kΩ
15.3 kΩ
14.4 kΩ
13.5 kΩ
12.7 kΩ
12.1 kΩ
11.4 kΩ
10.8 kΩ
10.3 kΩ
9.82 kΩ
9.36 kΩ
8.94 kΩ
8.18 kΩ
7.51 kΩ
6.92 kΩ
6.4 kΩ
5.93 kΩ
5.51 kΩ
5.13 kΩ
4.78 kΩ
4.47 kΩ
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
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
3.60
Rset
4.18 kΩ
3.91 kΩ
3.66 kΩ
3.44 kΩ
3.22 kΩ
3.03 kΩ
2.84 kΩ
2.67 kΩ
2.51 kΩ
2.36 kΩ
2.22 kΩ
2.08 kΩ
1.95 kΩ
1.83 kΩ
1.72 kΩ
1.61 kΩ
1.51 kΩ
1.41 kΩ
1.32 kΩ
1.23 kΩ
1.15 kΩ
1.07 kΩ
988 Ω
914 Ω
843 Ω
775 Ω
710 Ω
647 Ω
587 Ω
529 Ω
473 Ω
419 Ω
367 Ω
6
Sense
ATH30T05-9S
PTH05030W
GND
1, 3, 7
VO
8, 9
VOUT
GND Adjust
10
5
R SET
1 %, 0.1 W
COUT
330 µF
(Optional)
Notes:
1. Modules that operate from a 3.3-V input bus should
not be adjusted higher than 2.5 V.
2. 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 5 and 10 using dedicated
PCB traces.
3. Never connect capacitors from Vo Adjust to either GND or
Vout. Any capacitance added to the Vo Adjust pin will affect
the stability of the regulator.
GND
GND
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Europe (UK): 44(1384)842-211
Asia (HK): 852-2437-9662
Application Notes
ATH Series of Wide-Output Adjust Power
Modules (3.3/5-V Input)
Point-of-Load Alliance
The ATH family of non-isolated, wide-output adjust
power modules are optimized for applications that require
a flexible, high performance module that is small in size.
These products are part of the “Point-of-Load Alliance”
(POLA), which ensures compatible footprint,
interoperability and true second sourcing for customer
design flexibility. The POLA is a collaboration between
Texas Instruments, Artesyn Technologies, and Astec
Power to offer customers advanced non-isolated modules
that provide the same functionality and form factor. Product series covered by the alliance includes the ATH06
(6 A), ATH10 (10 A), ATH12/15 (12/15 A), ATH18/22
(18/22 A), and the ATH26/30 (26/30 A).
From the basic, “Just Plug it In” functionality of the 6-A
modules, to the 30-A rated feature-rich ATH30, these
products were designed to be very flexible, yet simple to use.
The features vary with each product. Table 3-1 provides
a quick reference to the available features by product
and input bus voltage.
ATH18/22 and ATH26/30 products incorporate over-temperature shutdown protection. All of the products
referenced in Table 3-1 include Auto-Track™. This is a
feature unique to the ATH family, and was specifically
designed to simplify the task of sequencing the supply
voltage in a power system. These and other features are
described in the following sections.
Soft-Start Power Up
The Auto-Track™ feature allows the power-up of multiple
ATH modules to be directly controlled from the Track
pin. However in a stand-alone configuration, or when
the Auto-Track™ feature is not being used, the Track
pin should be directly connected to the input voltage,
Vin (see Figure 3-1).
Figure 3–1
10
5V
2
Table 3-1; Operating Features by Series and Input Bus Voltage
VIN
Inhibit
3.3 V / 5 V
15 A
12 V
12 A
3.3 V / 5 V
22 A
12 V
18 A
3.3 V / 5 V
30 A
12 V
26 A
Pre-Bias Startup
•
•
•
•
•
•
Thermal Shutdown
12 V
10
8 AA
•
•
•
•
•
•
•
•
•
•
Output Sense
10 A
•
•
•
•
•
•
•
•
•
•
Margin Up/Down
PTHxx030
ATH26/30
6A
3.3 V / 5 V
•
•
•
•
•
•
•
•
•
•
Auto-Track™
PTHxx020
ATH18/22
12 V
Over-Current
PTHxx010
ATH12/15
6A
On/Off Inhibit
PTHxx060
ATH10
I OUT
3.3 V / 5 V
Adjust (Trim)
+
PTHxx050
ATH06
Input Bus
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
8
5
Track
Sense
PTH05020W
ATH22T05-9S
3
Series
9
Up Dn
3.3 V
6
Adjust
GND
1
VO
7
CIN
1,000 µF
4
+
Features of the ATH Family of Non-Isolated
Wide Output Adjust Power Modules
RSET, 698
0.1 W, 1 %
COUT
330 µF
GND
GND
When the Track pin is connected to the input voltage the
Auto-Track™ function is permanently disengaged. This
allows the module to power up entirely under the control
of its internal soft-start circuitry. When power up is under
soft-start control, the output voltage rises to the set-point
at a quicker and more linear rate.
Figure 3–2
Vin (1 V/Div)
Vout (1 V/Div)
For simple point-of-use applications, the ATH06 provides
operating features such as an on/off inhibit, output voltage trim, pre-bias startup (3.3/5-V input only), and
over-current protection. The ATH10 (10 A), and ATH12/
15 (12/15 A) include an output voltage sense, and margin
up/down controls. Then the higher output current,
Iin (5 A/Div)
HORIZ SCALE: 5 ms/Div
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Asia (HK): 852-2437-9662
Application Notes
ATH Series of Wide-Output Adjust Power
Modules (3.3/5-V Input)
From the moment a valid input voltage is applied, the
soft-start control introduces a short time delay (typically
5 ms-10 ms) before allowing the output voltage to rise.
The output then progressively rises to the module’s setpoint voltage. Figure 3-2 shows the soft-start power-up
characteristic of the 22-A output product (ATH22T05-9S),
operating from a 5-V input bus and configured for a 3.3-V
output. The waveforms were measured with a 5-A resistive
load, with Auto-Track™ disabled. The initial rise in input
current when the input voltage first starts to rise is the
charge current drawn by the input capacitors. Power-up
is complete within 15 ms.
The power modules function normally when the Inhibit
pin is left open-circuit, providing a regulated output
whenever a valid source voltage is connected to Vin with
respect to GND.
Figure 3-3 shows the typical application of the inhibit
function. Note the discrete transistor (Q1). The Inhibit
control has its own internal pull-up to Vin potential. The
input is not compatible with TTL logic devices. An opencollector (or open-drain) discrete transistor is recommended
for control.
Figure 3–3
Vo Sense
Over-Current Protection
The ATH18/22 and ATH26/30 series of products have
over-temperature protection. These products have an
on-board temperature sensor that protects the module’s
internal circuitry against excessively high temperatures.
A rise in the internal temperature may be the result of a
drop in airflow, or a high ambient temperature. If the
internal temperature exceeds the OTP threshold, the
module’s Inhibit control is automatically pulled low. This
turns the output off. The output voltage will drop as the
external output capacitors are discharged by the load
circuit. The recovery is automatic, and begins with a
soft-start power up. It occurs when the the sensed temperature decreases by about 10 °C below the trip point.
VIN
2
9
5
8
1
7
4
RSET
Q1
BSS138
VOUT
6
PTH05020W
ATH22T05-9S
3
CIN
1,000 µF
+
Over-Temperature Protection
10
COUT
330 µF
+
For protection against load faults, all modules incorporate
output over-current protection. Applying a load that
exceeds the regulator’s over-current threshold will cause
the regulated output to shut down. Following shutdown
a module will periodically attempt to recover by initiating
a soft-start power-up. This is described as a “hiccup” mode
of operation, whereby the module continues in a cycle of
successive shutdown and power up until the load fault is
removed. During this period, the average current flowing
into the fault is significantly reduced. Once the fault is
removed, the module automatically recovers and returns
to normal operation.
L
O
A
D
1 =Inhibit
GND
GND
Turning Q1 on applies a low voltage to the Inhibit control
and disables the output of the module. If Q1 is then turned
off, the module will execute a soft-start power-up. A
regulated output voltage is produced within 20 msec.
Figure 3-4 shows the typical rise in both the output voltage and input current, following the turn-off of Q1. The
turn off of Q1 corresponds to the rise in the waveform,
Q1 Vds. The waveforms were measured with a 5-A load.
Figure 3–4
Note: The over-temperature protection is a last resort mechanism to prevent thermal stress to the regulator. Operation at
or close to the thermal shutdown temperature is not recommended and will reduce the long-term reliability of the module.
Always operate the regulator within the specified Safe Operating
Area (SOA) limits for the worst-case conditions of ambient
temperature and airflow.
Vo (2V/Div)
Iin (2A/Div)
Output On/Off Inhibit
Q1Vds (5V/Div)
For applications requiring output voltage on/off control,
each series of the ATH family incorporates an output
Inhibit control pin. The inhibit feature can be used wherever there is a requirement for the output voltage from
the regulator to be turned off.
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HORIZ SCALE: 10ms/Div
Europe (UK): 44(1384)842-211
Asia (HK): 852-2437-9662
Application Notes
ATH Series of Wide-Output Adjust Power
Modules (3.3/5-V Input)
Auto-Track™ Function
The Auto-Track™ function is unique to the ATH family,
and is available with the all “Point-of-Load Alliance”
(POLA) products. Auto-Track™ was designed to simplify
the amount of circuitry required to make the output
voltage from each module power up and power down in
sequence. The sequencing of two or more supply voltages
during power up is a common requirement for complex
mixed-signal applications, that use dual-voltage VLSI ICs
such as DSPs, micro-processors, and ASICs.
How Auto-Track™ Works
Auto-Track™ works by forcing the module’s output voltage
to follow a voltage presented at the Track control pin. This
control range is limited to between 0 V and the module’s
set-point voltage. Once the track-pin voltage is raised
above the set-point voltage, the module’s output remains
at its set-point 1. As an example, if the Track pin of a 2.5-V
regulator is at 1 V, the regulated output will be 1 V. But
if the voltage at the Track pin rises to 3 V, the regulated
output will not go higher than 2.5 V.
When under track control, the regulated output from
the module follows the voltage at its Track pin on a voltfor-volt basis. By connecting the Track pin of a number
of these modules together, the output voltages will follow a common signal during power-up and power-down.
The control signal can be an externally generated master
ramp waveform, or the output voltage from another power
supply circuit 3. For convenience the Track control incorporates an internal RC charge circuit. This operates off
the module’s input voltage to provide a suitable rising
voltage ramp waveform.
Typical Application
The basic implementation of Auto-Track™ allows for
simultaneous voltage sequencing of a number of AutoTrack™ compliant modules. Connecting the Track control
pins of two or more modules forces the Track control of
all modules to follow the same collective RC ramp waveform, and allows them to be controlled through a single
transistor or switch; Q1 in Figure 3-5.
To initiate a power-up sequence the Track control must
first pulled to ground potential. This should be done at
or before input power is applied to the modules, and then
held for at least 10 ms thereafter. This brief period gives
the modules time to complete their internal soft-start
initialization, which enables them to produce an output
voltage.
Applying a logic-level high signal to the circuit’s On/Off
Control turns Q1 on and applies a ground signal to the
Track control. After completing their internal soft-start
intialization, the output of all modules will remain at zero
volts while Q1 is on. 10 ms after a valid input voltage has
been applied to all modules, Q1 can be turned off. This
allows the track control voltage to automatically rise
toward to the modules' input voltage. During this period
the output voltage of each module will rise in unison with
other modules, to its respective set-point voltage.
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Figure 3-6 shows the output voltage waveforms from the
circuit of Figure 3-5 after the On/Off Control is set from a
high to a low-level voltage. The waveforms, Vo1 and Vo2
represent the output voltages from the two power modules, U1 (3.3 V) and U2 (1.8 V) respectively. Vo1 and Vo2
are shown rising together to produce the desired simultaneous power-up characteristic.
The same circuit also provides a power-down sequence.
Power down is the reverse of power up, and is accomplished by lowering the track control voltage back to zero
volts. The important constraint is that a valid input voltage
must be maintained until the power down is complete. It
also requires that Q1 be turned off relatively slowly. This
is so that the Track control voltage does not fall faster than
Auto-Track's slew rate capability, which is 1 V/ms. The
components R1 and C1 in Figure 3-5 limit the rate at
which Q1 can pull down the Track control voltage. The
values of 100 k-ohm and 0.1 µF correlate to a decay rate
of about 0.17 V/ms.
The power-down sequence is initiated with a low-to-high
transition at the On/Off Control input to the circuit.
Figure 3-7 shows the power-down waveforms. As the
Track control voltage falls below the nominal set-point
voltage of each power module, then its output voltage
decays with all the other modules under Auto-Track™
control.
Notes on Use of Auto-Track™
1. The Track pin voltage must be allowed to rise
above the module’s set-point voltage before the
module can regulate at its adjusted set-point
voltage.
2. The Auto-Track™ function will track almost any
voltage ramp during power up, and is compatible
with ramp speeds of up to 1 V/ms.
3. The absolute maximum voltage that may be applied
to the Track pin is Vin.
4. The module will not follow a voltage at its Track
control input until it has completed its soft-start
initialization. This takes about 10 ms from the
time that the module has sensed that a valid voltage
has been applied its input. During this period, it is
recommended that the Track pin be held at ground
potential.
5. The module is capable of both sinking and
sourcing current when following a voltage at
its Track pin. Therefore startup into an output
prebias is not supported during Auto-Track™
control. Note: A pre-bias holdoff is not necessary when
all supply voltages rise simultaneously under the control of
Auto-Track™.
6. The Auto-Track™ function can be disabled by
connecting the Track pin to the input voltage (Vin).
With Auto-Track™ disabled, the output voltage
will rise at a quicker and more linear rate after
**Auto-Track is a trademark of Texas Intruments, Inc.
Europe (UK): 44(1384)842-211
Asia (HK): 852-2437-9662
Application Notes
ATH Series of Wide-Output Adjust Power
Modules (3.3/5-V Input)
Figure 3–5; Sequenced Power Up & Power Down Using Auto-Track
U1
10
9
8
5
Track
Inhibit
+
CIN
PTH05020W
ATH22T05-9S
VIN
VO
Vo1 =3.3 V
6
GND
3
7
1
COUT
4
R2
698
+
2
+5 V
C1
0.1 µF
U2
9
8
5
Track
2
CIN
0V
Figure 3–6; Simultaneous Power Up with Auto-Track™ Control
+
R1
100 k
10
Q1
BSS138
ATH15T05-9S
PTH05010W
VIN
Inhibit
3
VO
Vo2 =1.8 V
6
GND
1
7
4
R3
5k49
COUT
+
On/Off Control
1 = Power Down
0 = Power Up
Figure 3–7; Simultaneous Power Down with Auto-Track™ Control
Vo1 (1 V/Div)
Vo1 (1 V/Div)
Vo2 (1 V/Div)
Vo2 (1 V/Div)
On/Off Input
(5 V/Div)
On/Off Input
(5 V/Div)
HORIZ SCALE: 10 ms/Div
HORIZ SCALE: 10 ms/Div
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Europe (UK): 44(1384)842-211
Asia (HK): 852-2437-9662
Application Notes
ATH Series of Wide-Output Adjust Power
Modules (3.3/5-V Input)
Margin Up/Down Controls
Notes:
The ATH10 (10A), ATH12/15 (12/15A), ATH18/22 (18/
22A) and ATH26/30 (26/30A) products incorporate Margin
Up and Margin Down control inputs. These controls allow
the output voltage to be momentarily adjusted 1, either up
or down, by a nominal 5 %. This provides a convenient
method for dynamically testing the operation of the load
circuit over its supply margin or range. It can also be used to
verify the function of supply voltage supervisors. The
±5 % change is applied to the adjusted output voltage, as set
by the external resistor, Rset at the Vo Adjust pin.
The 5 % adjustment is made by pulling the appropriate
margin control input directly to the GND terminal 2.
A low-leakage open-drain device, such as an n-channel
MOSFET or p-channel JFET is recommended for this
purpose 3. Adjustments of less than 5 % can also be accommodated by adding series resistors to the control inputs.
The value of the resistor can be selected from Table 3-2,
or calculated using the following formula.
Up/Down Adjust Resistance Calculation
1. The Margin Up* and Margin Dn* controls were not
intended to be activated simultaneously. If they are
their affects on the output voltage may not completely
cancel, resulting in the possibility of a slightly higher
error in the output voltage set point.
2. The ground reference should be a direct connection to
the module GND at pin 7 (pin 1 for the ATH06).
This will produce a more accurate adjustment at the
load circuit terminals. The transistors Q1 and Q2 should
be located close to the regulator.
3. The Margin Up and Margin Dn control inputs are not
compatible with devices that source voltage. This includes
TTL logic. These are analog inputs and should only be
controlled with a true open-drain device (preferably
a discrete MOSFET transistor). The device selected
should have low off-state leakage current. Each input
sources 8 µA when grounded, and has an open-circuit
voltage of 0.8 V.
To reduce the margin adjustment to something less than
5 %, series resistors are required (See RD and RU in
Figure 3-8). For the same amount of adjustment, the
resistor value calculated for RU and RD will be the same.
The formulas is as follows.
RU or RD =
499
∆%
– 99.8
Table 3-2; Margin Up/Down Resistor Values
% Adjust
5
4
3
2
1
kΩ
Where ∆% = The desired amount of margin adjust in
percent.
RU / RD
0.0 kΩ
24.9 kΩ
66.5 kΩ
150.0 kΩ
397.0 kΩ
Figure 3–8; Margin Up/Down Application Schematic
10
9
8
1
7
PTH05010W
ATH15T05-9S
(Top View)
VIN
0V
2
RD
4
MargUp
5
RU
RSET
0.1 W, 1 %
Cin
MargDn
+VOUT
6
3
+
+Vo
+
Cout
Q2
GND
North America (USA): 1-888-41-ASTEC
L
O
A
D
Q1
GND
Europe (UK): 44(1384)842-211
Asia (HK): 852-2437-9662
Application Notes
ATH Series of Wide-Output Adjust Power
Modules (3.3/5-V Input)
Pre-Bias Startup Capability
Notes
Only selected products in the ATH family incorporate this
capability. Consult Table 3-1 to identify which products
are compliant.
1. Startup includes the short delay (approx. 10 ms)
prior to the output voltage rising, followed by the
rise of the output voltage under the module’s
internal soft-start control. Startup is complete
when the output voltage has risen to either the setpoint voltage or the voltage at the Track pin,
whichever is lowest.
A pre-bias startup condition occurs as a result of an external
voltage being present at the output of a power module prior
to its output becoming active. This often occurs in complex digital systems when current from another power
source is backfed through a dual-supply logic component,
such as an FPGA or ASIC. Another path might be via
clamp diodes as part of a dual-supply power-up sequencing
arrangement. A prebias can cause problems with power
modules that incorporate synchronous rectifiers. This is
because under most operating conditions, these types of
modules can sink as well as source output current.
2. To ensure that the regulator does not sink current
when power is first applied (even with a ground
signal applied to the Inhibit control pin), the input
voltage must always be greater than the output
voltage throughout the power-up and power-down
sequence.
3. The Auto-Track™ function can be disabled at
power up by immediately applying a voltage to the
module’s Track pin that is greater than its set-point
voltage. This can be easily accomplished by
connecting the Track pin to Vin.
The ATH family of power modules incorporate synchronous rectifiers, but will not sink current during startup 1,
or whenever the Inhibit pin is held low. However, to ensure
satisfactory operation of this function, certain conditions
must be maintained. 2 Figure 3-9 shows an application
demonstrating the pre-bias startup capability. The startup waveforms are shown in Figure 3-10. Note that the
output current from the ATH15T033 (Io) shows negligible
current until its output voltage rises above that backfed
through diodes D1 and D2.
Figure 3–10; Pre-Bias Startup Waveforms
Vin (1 V/Div)
Note: The pre-bias start-up feature is not compatible with
Auto-Track™. When the module is under Auto-Track™
control, it will sink current if the output voltage is below
that of a back-feeding source. To ensure a pre-bias hold-off
one of two approaches must be followed when input power is
applied to the module. The Auto-Track™ function must either
be disabled 3, or the module’s output held off (for at least
50 ms) using the Inhibit pin. Either approach ensures that the
Track pin voltage is above the set-point voltage at start up.
Vo (1 V/Div)
Io (5 A/Div)
HORIZ SCALE: 5 ms/Div
Figure 3–9; Application Circuit Demonstrating Pre-Bias Startup
VIN = 3.3 V
10
9
5
8
Track
2
VIN
Sense
ATH15T033-9S
PTH03010W
Inhibit
3
GND
1
VO
Vo = 2.5 V
6
+
Vadj
7
Io
4
VCCIO
VCORE
+
CIN
330 µF
North America (USA): 1-888-41-ASTEC
R2
2k21
+
COUT
330 µF
Europe (UK): 44(1384)842-211
ASIC
Asia (HK): 852-2437-9662
Application Notes
ATH Series of Wide-Output Adjust Power
Modules (3.3/5-V Input)
Remote Sense
The ATH10, ATH12/15, ATH18/22, and ATH26/30
products incorporate an output voltage sense pin,
Vo Sense. The Vo Sense pin should be connected to Vout at the
load circuit (see data sheet standard application). A remote sense improves the load regulation performance of
the module by allowing it to compensate for any ‘IR’ voltage
drop between itself and the load. An IR drop is caused by
the high output current flowing through the small
amount of pin and trace resistance. Use of the remote
sense is optional. If not used, the V o Sense pin can be left
open-circuit. An internal low-value resistor (15-Ω or
less) is connected between the Vo Sense and Vout. This ensures the output voltage remains in regulation.
With the sense pin connected, the difference between
the voltage measured directly between the Vout and GND
pins, and that measured from V o Sense to GND, is the
amount of IR drop being compensated by the regulator.
This should be limited to a maximum of 0.3 V.
Note: The remote sense feature is not designed to compensate
for the forward drop of non-linear or frequency dependent
components that may be placed in series with the converter
output. Examples include OR-ing diodes, filter inductors,
ferrite beads, and fuses. When these components are enclosed
by the remote sense connection they are effectively placed
inside the regulation control loop, which can adversely affect
the stability of the regulator.
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Europe (UK): 44(1384)842-211
Asia (HK): 852-2437-9662
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