TEXAS INSTRUMENTS SLTS213C Technical data
Auto-Track™
Sequencing
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PTH05050W —5-V Input
6-A, 5-V Input Non-Isolated
Wide-Output Adjust Power Module
NOMINAL SIZE = 0.87 in x 0.5 in
(22,1 mm x 12,57 mm)
Description
The PTH05050 is one of the smallest
non-isolated power modules from Texas
Instruments that features Auto-Track™.
Auto-Track simplifies supply voltage
sequencing in power systems by enabling
modules to track each other, or any other
external voltage, during power up and
power down.
Although small in size (0.87 in × 0.5 in),
these modules are rated for up to 6 A of
output current, and are an ideal choice in
applications where space, performance,
and a power-up sequencing capability are
important attributes.
The product provides high-performance
step-down conversion from a 5-V input
bus voltage. The output voltage of the
PTH05050W can be set to any voltage
Features
• Up to 6-A Output Current
• 5-V Input Voltage
• Wide-Output Voltage Adjust
(0.8 V to 3.6 V)
• Efficiencies up to 95 %
• 135 W/in³ Power Density
• On/Off Inhibit
• Pre-Bias Startup
• Under-Voltage Lockout
• Operating Temp: –40 to +85 °C
over the range, 0.8 V to 3.6 V, using a
single resistor.
Other operating features include an
on/off inhibit, output voltage adjust (trim),
and output over-current protection. For
high efficiency these parts employ a
synchronous rectifier output stage, but a
pre-bias hold-off capability ensures that
the output will not sink current during
startup.
Target applications include telecom,
industrial, and general purpose circuits,
including low-power dual-voltage systems
that use a DSP, microprocessor, ASIC, or
FPGA.
Package options include both through-
hole and surface mount configurations.
• Auto-Track™ Sequencing
• Output Over-Current Protection
• IPC Lead Free 2
• Safety Agency Approvals:
• Point-of-Load Alliance (POLA)
SLTS213C – MAY 2003 – REVISED MAY 2004
(Non-Latching, Auto-Reset)
UL 1950, CSA 22.2 950, EN60950
VDE (Pending)
Compatible
Pin Configuration
Pin Function
1 GND
2 Track
3V
in
4 Inhibit *
5Vo Adjust
6V
out
* Denotes negative logic:
Open = Normal operation
Ground = Function active
Standard Application
Track
V
IN
C
IN
100 µF
(Required)
Inhibit
GND
For technical support and further information, visit http://power.ti.com
1
2
3
4
PTH05050W
(Top View)
R
SET
1 %, 0.1 W
(Required)
6
5
Co
1
100 µF
Electrolytic
(Optional)
R
= Required to set the output voltage to a value
set
higher than 0.8 V. (See spec. table for values)
Cin= Required 100 µF
Co1= Optional 100 µF capacitor
Co2= Optional 10 µF ceramic capacitor for reduced
output ripple.
V
OUT
Co
2
10 µF
Ceramic
(Optional)
GND
PTH05050W —5-V Input
6-A, 5-V Input Non-Isolated
Wide-Output Adjust Power Module
Ordering Information
Output Voltage
Code Voltage
W 0.8 V – 3.6 V (Adjust)
Notes: (1) Add “T” to end of part number for tape and reel on SMD packages only.
(2) Reference the applicable package reference drawing for the dimensions and PC board layout
(3) “Standard” option specifies 63/37, Sn/Pb pin solder material.
(PTH05050Hxx)
Package Options
Code Description Pkg Ref.
AH Horiz. T/H (EUU)
AS SMD, Standard
(PTH05050xHH)
Pin Descriptions
Vin: The positive input voltage power node to the mod-
ule, 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.
Vo Adjust: A 1 % 0.1 W resistor must be directly connected
between this pin and 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 this is pin is
left open circuit, the output voltage will default to its
lowest value. For further information on output voltage
adjustment consult the related application note.
R
set
= 10 kΩ ·
The specification table gives the preferred resistor values
for a number of standard output voltages.
0.8 V
V
– 0.8 V
out
– 2.49 kΩ
SLTS213C – MAY 2003 – REVISED MAY 2004
(1)
(2)
(3)
(EUV)
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.
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, the input should
be connected to V
. Note: Due to the under-voltage lockout
in
feature, the output of the module cannot follow its own input
voltage during power up. For more information, consult the
related application note.
For technical support and further information, visit http://power.ti.com
PTH05050W —5-V Input
6-A, 5-V Input Non-Isolated
Wide-Output Adjust Power Module
SLTS213C – MAY 2003 – REVISED MAY 2004
Environmental & Absolute Maximum Ratings (Voltages are with respect to GND)
Characteristics Symbols Conditions Min Typ Max Units
Track Input Voltage V
Operating Temperature Range T
Solder Reflow Temperature T
Storage Temperature T
Mechanical Shock Per Mil-STD-883D, Method 2002.3
Mechanical Vibration Mil-STD-883D, Method 2007.2
track
a
reflow
s
Over Vin Range –40
Surface temperature of module body or pins 235
— –40 — 125 °C
1 msec, ½ Sine, mounted
20-2000 Hz
Weight — — 2.9 — grams
Flammability — Meets UL 94V-O
Notes: (i) For operation below 0 °C the external capacitors m ust bave 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.
Specifications (Unless otherwise stated, T
=25 °C, Vin =5 V, Vo =3.3 V, Cin =100 µF, Co1 =0 µF, Co2 =0µF, and Io =Iomax)
a
Characteristics Symbols Conditions Min Typ Max Units
Output Current I
Input Voltage Range V
o
in
0.8 V ≤ Vo ≤ 3.6 V, 85°C, natural convection 0 — 6
Over Io range 4.5 — 5.5 V
Set-Point Voltage Tolerance Vo tol — — ±2
Temperature Variation ∆Reg
Line Regulation ∆Reg
Load Regulation ∆Reg
Total Output Variation ∆Reg
temp
line
load
tot
Efficiency η I
Vo Ripple (pk-pk) V
r
–40 °C <Ta < +85 °C — ±0.5 — %V
Over Vin range — ±10 — mV
Over Io range — ±12 — mV
Includes set-point, line, load,
–40 °C ≤ Ta ≤ +85 °C
=4 A R
o
= 698 Ω Vo = 3.3 V — 95 —
SET
= 2.21 kΩ Vo = 2.5 V — 93 —
R
SET
= 4.12 kΩ Vo = 2.0 V — 91 —
R
SET
= 5.49 kΩ Vo = 1.8 V — 90 —
R
SET
= 8.87 kΩ Vo = 1.5 V — 89 —
R
SET
= 17.4 kΩ Vo = 1.2 V — 87 —
R
SET
R
= 36.5 kΩ Vo = 1.0 V — 85 —
SET
20 MHz bandwidth, Co2 =10 µF ceramic — 20
Over-Current Threshold Io trip Reset, followed by auto-recovery — 12 — A
Transient Response 1 A/µs load step, 50 to 100 % I
t
tr
∆V
tr
Co
=100 µF
1
max,
o
Recovery Time — 70 — µSec
Vo over/undershoot — 100 — mV
Track Input Current (pin 2) IIL track Pin to GND — — –130
Track Slew Rate Capability dV
Under-Voltage Lockout UVLO V
Inhibit Control (pin4) Referenced to GND
Input High Voltage V
Input Low Voltage
Input Low Current
V
I
IL
track
IH
IL
inhibit
/dt C
≤ C
(max) — — 1 V/ms
out
out
increasing — 4.3 4.45
in
Vin decreasing 3.4 3.7 —
Pin to GND — –130 — µA
Input Standby Current Iin inh Inhibit (pin 4) to GND, Track (pin 2) open — 10 — mA
Switching Frequency ƒ
External Input Capacitance C
s
in
External Output Capacitance Co1, Co
Over Vin and Io ranges 550 600 650 kHz
Capacitance value non-ceramic 0 100
2
ceramic 0 — 300
Equiv. series resistance (non-ceramic) 4
Reliability MTBF Per Bellcore TR-332
Notes:
(1) No derating is required when the module is soldered directly to a 4-layer PCB with 1 oz. copper.
(2) The set-point voltage tolerance is affected by the tolerance and stability ofR
with 100 ppm/°C or better temperature stability.
(3) The pk-pk output ripple voltage is measured with an external 10 µF ceramic capacitor. See the standard application schematic.
(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 100 µF input capacitor is required for proper operation. The capacitor must be rated for a minimum of 300 mA rms of ripple current.
(6) An external output capacitor is not required for basic operation. Adding 100 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 typcial ESR for all the electrolytic (non-ceramic) output capacitance. Use 7 m
50 % stress, Ta =40 °C, ground benign
. The stated limit is unconditionally met if R
SET
Ω
as the minimum when using max-ESR values to calculate.
–0.3 — Vin + 0.3 V
(i)
— 85 °C
(ii)
— 500 — G’s
—20— G’s
PTH05050W
(1)
(2)
——±3
(3)
Vin –0.5 — Open
–0.2 — 0.6
(5)
100
——µF
(6)
(8)
——mΩ
(2)
— mVpp
(4)
(4)
(7)
3,300
6 ——10
has a tolerance of 1 %
SET
°C
A
%V
%V
%
µA
V
V
µF
6
o
o
o
Hrs
For technical support and further information, visit http://power.ti.com
PTH05050W —5-V Input
Typical Characteristics
6-A, 5-V Input Non-Isolated
Wide-Output Adjust Power Module
Characteristic Data; Vin =5 V (See Note A)
Efficiency vs Load Current
100
90
80
70
Efficiency - %
60
50
0123456
Output Ripple vs Load Current (See Note 3 to Table)
50
40
30
20
Ripple - mV
10
Iout - Amps
SLTS213C – MAY 2003 – REVISED MAY 2004
V
OUT
3.3 V
2.5 V
1.8 V
1.5 V
1.2 V
1.0 V
V
OUT
2.5 V
3.3 V
1.8 V
1.5 V
1.2 V
1.0 V
0
0123456
Power Dissipation vs Load Current
1.50
1.25
1.00
0.75
Pd - Watts
0.50
0.25
0.00
0123456
Iout - Amps
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.
For technical support and further information, visit http://power.ti.com
Application Notes
PTH03050W & PTH05050W
Capacitor Recommendations for the PTH03050 &
PTH05050 Series of Power Modules
Input Capacitor
The recommended input capacitor(s) is determined by
the 100 µF
minimum ripple current rating.
Ripple current, less than 100 mΩ equivalent series resis-
tance (ESR), and temperature are the major considerations
when selecting input capacitors. Unlike polymer tantalum,
regular tantalum capacitors have a recommended mini-
mum 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 100 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 adequate. These capacitors provide decoupling over the frequency range, 2 kHz
to 150 kHz, and are suitable when ambient temperatures
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 equiva-
lent 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/
[1]
minimum capacitance and 300 mArms
T510 capacitor series are suggested over many other
tantalum types due to their higher rated surge, power
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 as they have reduced power dissipation and surge
current ratings. 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 Output
Capacitors for PTH Products in High-Performance Applications.”
For technical support and further information, visit http://power.ti.com
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