For technical support and further information visit http://power.ti.com
Standard Application
Features
Up to 6-A Output Current
5-V Input Voltage
Wide-Output Voltage Adjust
(0.9 V to 3.6 V)
Efficiencies up to 94 %
160 W/in³ Power Density
On/Off Inhibit
Under-Voltage Lockout
6-A, 5-V Input Non-Isolated
Wide-Output Adjust Power Module
Rset = Required to set the output voltage to a value
higher than 0.9 V. See spec. table for values.
Cin = Required 330 µF capacitor
Cout = Optional 100 µF capacitor
Output Current Limit
Pre-Bias Startup Capability
Over-Temperature Protection
Surface Mountable
Operating Temp: –40 to +85 °C
Safety Agency Approvals (Pending):
UL 1950, CSA 22.2 950, EN60950
& VDE
V
IN
Inhibit
GND GND
V
OUT
R
SET
1 %, 0.1 W
(Required)
C
OUT
100 µF
Electrolytic
(Optional)
C
IN
330 µF
(Required)
PTH05000W
(Top View)
1
4
2
3
5
SLTS201C – MAY 2003 – REVISED DECEMBER 2003
Description
The PTH05000 series of non-isolated
power modules are small in size and high
on performance. Using double-sided sur-
face mount construction and synchronous
rectification technology, these regulators
deliver up to 6 A of output current while
occupying a PCB area of about half the
size of a standard postage stamp. They
are an ideal choice for applications where
space, performance and cost are impor-
tant design constraints.
The series operates from an input
voltage of 5 V to provide step-down
power conversion to any output voltage
over the range, 0.9 V to 3.6 V. The out-
put voltage of the PTH05000W is set
within this range using a single resistor.
Operating features include an on/off
inhibit, output voltage adjust (trim), an
output current limit, and over-tempera-
ture protection.
For high efficiency these parts employ
a synchronous rectifier output stage. An
output pre-bias holdoff capability ensures
that the output will not sink current dur-
ing startup.
Target applications include telecom,
industrial, and general purpose circuits,
including low-power dual-voltage systems
that use a DSP, microprocessor, or ASIC.
Package options include both through-
hole and surface mount configurations.
Pin Configuration
Pin Function
1 GND
2V
in
3 Inhibit *
4V
o Adjust
5V
out
* Denotes negative logic:
Open = Output On
Ground = Output Off
NOMINAL SIZE = 0.75 in x 0.5 in
(19,05 mm x 12,7 mm)
PTH05000W —5-V Input
For technical support and further information visit http://power.ti.com
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
‘Vinand ‘Vout’ power connections. It is also the 0 VDC
reference for the ‘Inhibit’ and ‘Vo Adjust’ control input.
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 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 the GND pin to set the output voltage
to a value higher than 0.9 V. The temperature stability
of the resistor should be 100 ppm/°C (or better). The set
point range for the output voltage is from 0.9 V to 3.6 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 application note.
Rset = 10 k · 0.891 V 3.24 k
Vout – 0.9 V
The specification table gives the preferred resistor values
for a number of standard output voltages.
Ordering Information
Package Options (PTH05000xHH)(1)
Code Description Pkg Ref.
(2)
AH Horiz. T/H (EUS)
AS SMD, Standard (3) (EUT)
Output Voltage (PTH05000Hxx)
Code Voltage
W 0.9 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.
6-A, 5-V Input Non-Isolated
Wide-Output Adjust Power Module
SLTS201C – MAY 2003 – REVISED DECEMBER 2003
PTH05000W —5-V Input
For technical support and further information visit http://power.ti.com
Environmental & Absolute Maximum Ratings
Characteristics Symbols Conditions Min Typ Max Units
Operating Temperature Range TaOver Vin Range –40 (i) +85 °C
Solder Reflow Temperature Treflow Surface temperature of module body or pins 235 (ii) °C
Storage Temperature Ts –40 +125 °C
Over Temperature Protection OTP IC junction temperature 150 °C
Mechanical Shock Per Mil-STD-883D, Method 2002.3 500 G’s
1 msec, ½ sine, mounted
Mechanical Vibration Mil-STD-883D, Method 2007.2 —20— Gs
20-2000 Hz
Weight 2 grams
Flammability 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.
6-A, 5-V Input Non-Isolated
Wide-Output Adjust Power Module
SLTS201C – MAY 2003 – REVISED DECEMBER 2003
PTH05000W —5-V Input
Electrical Specifications Unless otherwise stated, Ta =25 °C, Vin =5 V, Vo =3.3 V, Cin =330 µF, Cout =0 µF, and Io =Io(max)
PTH05000W
Characteristics Symbols Conditions Min Typ Max Units
Output Current Io0.9 V Vo 3.6 V, Ta =25 °C, natural convection 0 6 (1) A
Ta =60 °C, 200LFM 0 5.25 (1)
Input Voltage Range Vin Over Io range 4.5 5.5 V
Set-Point Voltage Tolerance Vo tol ±2 (2) %Vo
Temperature Variation Regtemp –40 °C <Ta < +85 °C ±0.5 %Vo
Line Regulation Regline Over Vin range ±5 mV
Load Regulation Regload Over Io range ±5 mV
Total Output Variation Regtot Includes set-point, line, load, ±3 (2) %Vo
–40 °C Ta +85 °C
Efficiency ηVin =5 V, Io =4 A RSET = 475 Vo = 3.3 V 92
RSET = 2.32 kVo = 2.5 V 90
RSET = 4.87 kVo = 2.0 V 88
RSET = 6.65 kVo = 1.8 V 87 %
RSET = 11.5 kVo = 1.5 V 84
RSET = 26.1 kVo = 1.2 V 82
RSET = 84.5 kVo = 1.0 V 79
Vo Ripple (pk-pk) Vr20 MHz bandwidth Vo 3.3 V 30 mVpp
Vo 2.5 V 25
Transient Response 1 A/µs load step, 50 to 100 % Iomax,
Vo =1.8 V, Cout =100 µF
ttr Recovery time 70 µSec
Vtr Vo over/undershoot 100 mV
Current Limit Ilim Vo = –50 mV 13 A
Under-Voltage Lockout UVLO Vin increasing 3.8 4.3 V
Vin decreasing 3.4 3.5
Inhibit Control (pin 3) Referenced to GND
Input High Voltage VIH Vin –0.5 Open (3) V
Input Low Voltage VIL –0.2 0.8
Input Low Current IIL Pin 3 to GND –10 µA
Standby Input Current Iin standby pins 1 & 3 connected 1 mA
Switching Frequency ƒsOver Vin and Io ranges 700 kHz
External Input Capacitance Cin 330 (4) ——µF
External Output Capacitance Cout Capacitance value non-ceramic 0 100 (5) 1,000 (6) µF
ceramic 0 300
Equiv. series resistance (non-ceramic) 4 (7) ——m
Reliability MTBF Per Bellcore TR-332 28——10
6 Hrs
50 % stress, Ta =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 ofRSET. The stated limit is unconditionally met if RSET has a tolerance of 1 %
with 100 ppm/°C or better temperature stability.
(3) The Inhibit control (pin 3) has an internal pull-up to Vin, and if left open-circuit the module will operate when input power is applied. A small low-
leakage (<100 nA) MOSFET is recommended to control this input. See application notes for more information.
(4) The regulator requires a minimum of 330 µF input capacitor with a minimum 300 mArms ripple current rating. For further information, consult the
related application note on Capacitor Recommendations.
(5) An external output capacitor is not required for basic operation. Adding 100 µF of distributed capacitance at the load will improve the transient response.
(6) This is the calculated maximum. The minimum ESR limitation will often result in a lower value. Consult the application notes for further guidance.
(7) This is the typical ESR for all the electrolytic (non-ceramic) output capacitance. Use 7 m
as the minimum when using max-ESR values to calculate.
For technical support and further information visit http://power.ti.com
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.
Typical Characteristics
Characteristic Data; Vin =5 V (See Note A)
Efficiency vs Output Current
Power Dissipation vs Output Current
Ripple vs Output Current
20
30
40
50
60
70
80
90
0123456
Iout
(
A
)
Ambient Temperature (°C)
400LFM
200LFM
100LFM
Nat Conv
Airflow
Safe Operating Area; Vin =5 V (See Note B)
All Output Voltages
50
60
70
80
90
100
0123456
Iout - Am
p
s
Efficiency - %
3.3 V
2.5 V
2.0 V
1.8 V
1.5 V
1.2 V
1.0 V
VOUT
0
10
20
30
40
50
0123456
Iout - Am
p
s
Ripple - mV
3.3 V
2.5 V
2.0 V
1.8 V
1.5 V
1.2 V
1.0 V
VOUT
0
0.5
1
1.5
2
2.5
3
0123456
Iout - Am
p
s
Pd - Watts
6-A, 5-V Input Non-Isolated
Wide-Output Adjust Power Module
SLTS201C – MAY 2003 – REVISED DECEMBER 2003
PTH05000W —5-V Input
Application Notes
For technical support and further information visit http://power.ti.com
PTH05000W
Capacitor Recommendations for the PTH05000W
Wide-Output Adjust Power Modules
Input Capacitor
The recommended input capacitor(s) is determined by
the 330 µF minimum capacitance and 300 mArms mini-
mum ripple current rating.
Ripple current, less than 300 m 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 [2] may 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 capaci-
tors provide decoupling over the frequency range, 2 kHz
to 150 kHz, and are suitable for 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 m (7 m 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 [2] 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 ce-
ramic 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
dissipation, and ripple current capability. As a caution
many general purpose tantalum capacitors have consid-
erably higher ESR, reduced power dissipation and lower
ripple current capability. These capacitors are also less
reliable as they have lower 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 encoun-
tered 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 100 kHz) 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 regu-
lation 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, the selection of output ca-
pacitors becomes more important. For further guidance
consult the separate application note, Selecting Output
Capacitors for PTH Products in High-Performance Applica-
tions.
Application Notes
continued
For technical support and further information visit http://power.ti.com
PTH05000 Series
Table 1-1: Input/Output Capacitors
[1] A total capacitance of 300 µF is acceptable based on the surge current capability of ceramic capacitors.
[2] A ceramic capacitor may be used to complement electrolytic types at the input to further reduce high-frequency ripple current.
/epyT,rodneVroticapaC
)elytS(seireS scitsiretcarahCroticapaCytitnauQ
gnikroW
egatloV)Fµ(eulaV RSE.xaM
zHk001ta
elppiR.xaM
C°58tatnerruC
)smrI(
eziSlacisyhP
)mm(
tupnI
suB
tuptuO
suB
rebmuNrodneV
cinosanaP )DMS(munimulA-yloP,AW )DMS(munimulA,CF )DMS(munimulA,KF )laidaR(munimulA,CF
V01 V61 V61 V01
Fµ033 Fµ033 Fµ033 Fµ033
.0530
051.0
061.0
711.0
Am0082 Am076 Am006 Am055
8×9.6
01 ×2.01
8×2.01
8×5.11
1
1
1
1
3
3
3
3
P121A1AWFEE P133C1CFVEE P133C1KFVEE 133A1CFUEE
noCimehCdetinU )DMS(mulA-yloP,AXP )laidaR(noc-sO,SF )laidaR(munimulA,ZXL )DMS(numimulA,ZVM )laidaR(munimulA-yloP,ASP
V01 V01 V61 V52 V3.6
033FµFµ033 Fµ033 033FµFµ093
420.0
520.0
021.0
071.0
800.0
Am0773 Am0053 Am555 Am054 Am0805
01 ×7.7
01 ×5.01
8×21
8×01
8×5.11
1
1
1
1
1
3
3
3
3
1
PT08JM133CV01AXP M033SF01 LL21x8M133BV61ZXL PT01HM133CV52ZVM 11HM093BV3.6ASP
munimulAnocihciN )DMS(GW )laidaR(MP V61 V01 033Fµ
033Fµ051.0
061.0 Am076 Am064 01 ×01
8×5.11 1
13
3SG1RNM133C1GWU HHM133A1MPU
oynaS )DMS(noc-sO,PVS )laidaR(noc-sO,PS )DMS(remyloPpacsoP,EPT
V01 V01 V3.6
033FµFµ074 Fµ033
520.0
510.0
520.0
Am0073 Am0054 Am0042
01 ×8
01 ×5.01
L3.7 ×W3.4
1
1
1
3
2
3
XM033PVS01 M074PS01 LM033EPT6
SPTmulatnaTXVA )DMS( V01 V01 Fµ033 Fµ033 01.00
060.0 Am0011 Am0002 L3.7
×W3.4 ×H1.4 1
13
30010R010M733VSPT 0600R010M733VSPT
)DMS(temeK ,025TmunimulAyloP .mulA-yloPcinagrO,035T
V01 V01 Fµ033 Fµ033 040.0
510.0 Am0021 Am0011 L3.7 ×W7.5
×H0.4 1
13
2SA010M733X025T SA010M733X035T
eugarpS-yahsiV )DMS(mulatnaT,D495 )DMS(mulatnaT,D595 )DMS(noc-sO,PVS49 )laidaR(noc-sO,AS49
V01 V01 V3.6 V3,6
Fµ033 Fµ033 Fµ033 Fµ033
540.0
041.0
520.0
520.0
Am0041 Am0001 Am0033 Am0053
L3.7
×W0.6 ×H1.4
01 ×8
01 ×5.01
1
1
1
1
3
3
3
3
T2R0100X733D495 T2D0100X733D595 8F3R60X733PVS49 PBF3R60X733AS49
)DMS(R5XcimareC,temeKV61 V3.6 0174 200.0
200.0 —esac0121 mm5223 1]2[
1]2[ 3
2CAP4M601C0121C CAP9K674C0121C
cimareC,ataruMR5X)DMS(V3.6 V3.6 V61 V61
001 742201
200.0 —esac0121 mm5223 3]1[
1]2[
1]2[
1]2[
1
2
3
3
M701J06RE23MRG M674J06RE23MRG K622C16RE23MRG K601C16RD23MRG
cimareC,KDTR5X)DMS(V3.6 V3.6 V61 V61
001 742201
200.0 —esac0121 mm5223 3]1[
1]2[
1]2[
1]2[
1
2
3
3
TM701J0R5X5223C TM674J0R5X5223C TM622C1R5X5223C TM601C1R5X5223C
Application Notes
For technical support and further information visit http://power.ti.com
Adjusting the Output Voltage of the PTH05000W
Wide-Output Adjust Power Modules
The Vo Adjust control (pin 4) sets the output voltage of
the PTH05000Wproduct. The adjustment range is
from 0.9 V to 3.6 V. The adjustment method requires
the addition of a single external resistor, Rset, that must
be connected directly between the Vo Adjust and GND
pins 1. 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 k · 0.891 V 3.24 k
Vout – 0.9 V
Figure 2-1; Vo Adjust Resistor Placement
Notes:
1. Use a 0.1 W resistor. The tolerance should be 1 %,
with a 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 1
using dedicated PCB traces.
2. 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.
0.900 Open
0.925 353 k
0.950 175 k
0.975 116 k
1.000 85.9 k
1.025 68.0 k
1.050 56.2 k
1.075 47.7 k
1.100 41.3 k
1.125 36.4 k
1.150 32.4 k
1.175 29.2 k
1.200 26.5 k
1.225 24.2 k
1.250 22.2 k
1.275 20.5 k
1.300 19.0 k
1.325 17.7 k
1.350 16.6 k
1.375 15.5 k
1.400 14.6 k
1.425 13.7 k
1.450 13.0 k
1.475 12.3 k
1.50 11.6 k
1.55 10.5 k
1.60 9.49 k
1.65 8.64 k
1.70 7.90 k
1.75 7.24 k
1.80 6.66 k
1.85 6.14 k
1.90 5.67 k
1.95 5.25 k
Vout (Standard) Rset (Prefd Value) Vout (Actual)
3.3 V 475 3.298V
2.5 V 2.32 k2.502 V
2 V 4.87 k1.999 V
1.8 V 6.65 k1.801 V
1.5 V 11.5 k1.504 V
1.2 V 26.1 k1.204 V
1 V 84.5 k1.001 V
0.9 V Open 0.9 V
Table 2-1; Preferred Values of Rset
for Standard Output Voltages
Table 2-2; Output Voltage Set-Point Resistor Values
Va ReqdR
set Va ReqdR
set
2.00 4.86 k
2.05 4.51 k
2.10 4.19 k
2.15 3.89 k
2.20 3.61 k
2.25 3.36 k
2.30 3.12 k
2.35 2.90 k
2.40 2.70 k
2.45 2.51 k
2.50 2.33 k
2.55 2.16 k
2.60 2.00 k
2.65 1.85 k
2.70 1.71 k
2.75 1.58 k
2.80 1.45 k
2.85 1.33 k
2.90 1.22 k
2.95 1.11 k
3.00 1.00 k
3.05 904
3.10 810
3.15 720
3.20 634
3.25 551
3.30 473
3.35 397
3.40 324
3.45 254
3.50 187
3.55 122
3.60 60
PTH05000W
V
IN
1
4
5
2
3
C
IN
330µF
(Required)
+
C
OUT
100µF
(Optional)
+
Inhibit
GND GND
V
OUT
R
SET
0.1 W, 1 %
V
O
Adj
GNDInhibit
V
IN
V
O
PTH05000W
Application Notes
For technical support and further information visit http://power.ti.com
Output On/Off Inhibit
For applications requiring output voltage on/off control,
the PTH03000W & PTH05000W power modules in-
corporate an output on/off Inhibit control (pin 3). The
inhibit feature can be used wherever there is a require-
ment for the output voltage from the regulator to be
turned off.
The power module functions 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 3-2 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. An
open-collector or open-drain device is recommended to
control this input.
Turning Q1 on applies a low voltage to the Inhibit control
pin and disables the output of the module. If Q1 is then
turned off, the module will execute a soft-start power-up
sequence. A regulated output voltage is produced within
20 msec. Figure 3-3 shows the typical rise in the out-
put voltage, following the turn-off of Q1. The turn off of
Q1 corresponds to the fall in the waveform, Q1 Vgs. The
waveforms were measured with a 5-A resistive load.
Figure 3-2
Figure 3-3
Power-Up Characteristics
When configured per their standard application, the
PTH03000 and PTH05000 series of power modules will
produce a regulated output voltage following the appli-
cation of a valid input source voltage. During power up,
internal soft-start circuitry slows the rate that the output
voltage rises, thereby limiting the amount of in-rush
current that can be drawn from the input source. The
soft-start circuitry introduces a short time delay (typi-
cally 10 ms) into the power-up characteristic. This is
from the point that a valid input source is recognized.
Figure 3-1 shows the power-up waveforms for a PTH05000W
(5-V input), with the output voltage set point adjusted for a
2-V output. The waveforms were measured with a 5-A
resistive load. The initial rise in input current when the
input voltage first starts to rise is the charge current drawn
by the input capacitors.
Figure 3-1
Current Limit Protection
The PTHxx000W modules protect against load faults
with a continuous current limit characteristic. Under a
load fault condition the output current cannot exceed
the current limit value. Attempting to draw current that
exceeds the current limit value causes the output voltage
to be progressively reduced. Current is continuously
supplied to the fault until it is removed. Upon removal of
the fault, the output voltage will promptly recover.
Thermal Shutdown
Thermal shutdown protects the module’s internal circuitry
against excessively high temperatures. A rise in tempera-
ture may be the result of a drop in airflow, a high ambient
temperature, or a sustained current limit condition. If
the junction temperature of the internal components
exceed 150 °C, the module will shutdown. This reduces
the output voltage to zero. The module will start up
automatically, by initiating a soft-start power up when
the sensed temperature decreases 10 °C below the thermal
shutdown trip point.
PTH03000 & PTH05000 Series
PTH05000W
V
IN
=5 V
1
4
5
2
3
C
IN
330 µF
(Required)
+
C
OUT
100 µF
(Optional)
+
Inhibit
GND
V
O
=2 V
4k87
0.1 W, 1 %
V
O
Adj
GNDInhibit
V
IN
V
O
L
O
A
D
GND
Q
1
BSS138
Vo (1 V/Div)
Q1 Vgs
(10 V/Div)
HORIZ SCALE: 5 ms/Div
Vin (2 V/Div)
Vo (1 V/Div)
Iin (2 A/Div)
HORIZ SCALE: 5 ms/Div
Application Notes
For technical support and further information visit http://power.ti.com
PTH05000W Startup with Output Pre-Bias
A pre-bias startup condition occurs as a result of an external
voltage being present at the output of the power module
prior to its output voltage rising. 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 (to a higher supply voltage) as part of a
sequential power-up arrangement.
An output prebias can cause problems with power modules
that incorporate synchronous rectifiers. This is because
under most operating conditions, they can sink as well as
source ouput current. Although the PTH05000W (5-V
input) power module can sink current under normal op-
eration, it will not do so during startup. 1 This is true as
long as certain conditions are maintained. 2 Figure 3-1
shows an application schematic that demonstrates this
capability. Figure 3-2 shows the waveforms of the circuit
after input power is applied. Note that the module’s out-
put current (Io) is never negative. Only positive current
is sourced. This occurs when the output voltage is raised
above that which is backfed from the 5-V input supply, via
the diodes D1 through D4. 3
Notes
1. Start up includes both the application of a valid input
source voltage, or the removal of a ground signal from
the Inhibit* control (pin 3) with a valid input source
applied. The output of the regulator is effectively off
(tri-state), during the period that the Inhibit* control is
held low.
Figure 3-2; Start-up with Output Pre-Bias
Figure 3-1; Schematic Demonstrating Startup with Output Pre-Bias
2. To ensure that the regulator does not sink current, the
input voltage must always be greater or equal to the
output voltage throughout the power-up and power-down
sequence.
3. If during power up, the backfeeding source is greater
than the module’s set-point voltage, the module’s
output voltage will remain higher than its set point.
The output will remain out of regulation until the back-
feeding source is either reduced in voltage or removed.
PTH05000W
Vin (1 V/Div)
Vo (1 V/Div)
Io (2 A/Div)
HORIZ SCALE: 5 ms/Div
PTH05000W
V
IN
=5 V
1
4
5
2
3
C
IN
330 µF
(Required)
+
C
OUT
100 µF
(Optional)
+
Inhibit
GND
V
O
=2.5 V
2k32
0.1 W, 1 %
V
O
Adj
GNDInhibit
V
IN
V
O
L
O
A
D
GND
D
1
- D
4
MUR460
0.55
Resistive
PACKAGE OPTION ADDENDUM
www.ti.com 5-May-2011
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) Samples
(Requires Login)
PTH05000WAD ACTIVE Through-
Hole Module EUS 5 56 Pb-Free (RoHS) SN N / A for Pkg Type
PTH05000WAH ACTIVE Through-
Hole Module EUS 5 56 Pb-Free (RoHS) SN N / A for Pkg Type
PTH05000WAS ACTIVE Surface
Mount Module EUT 5 49 TBD SNPB Level-1-235C-UNLIM/
Level-3-260C-168HRS
PTH05000WAST ACTIVE Surface
Mount Module EUT 5 250 TBD SNPB Level-1-235C-UNLIM/
Level-3-260C-168HRS
PTH05000WAZ ACTIVE Surface
Mount Module EUT 5 49 Pb-Free (RoHS) SNAGCU Level-3-260C-168 HR
PTH05000WAZT ACTIVE Surface
Mount Module EUT 5 250 Pb-Free (RoHS) SNAGCU Level-3-260C-168 HR
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
PACKAGE OPTION ADDENDUM
www.ti.com 5-May-2011
Addendum-Page 2
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements,
and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should
obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are
sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard
warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where
mandated by government requirements, testing of all parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and
applications using TI components. To minimize the risks associated with customer products and applications, customers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right,
or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information
published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a
warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual
property of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied
by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive
business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional
restrictions.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all
express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not
responsible or liable for any such statements.
TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably
be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing
such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products
and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be
provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in
such safety-critical applications.
TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are
specifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet military
specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at
the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.
TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are
designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated
products in automotive applications, TI will not be responsible for any failure to meet such requirements.
Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products Applications
Audio www.ti.com/audio Communications and Telecom www.ti.com/communications
Amplifiers amplifier.ti.com Computers and Peripherals www.ti.com/computers
Data Converters dataconverter.ti.com Consumer Electronics www.ti.com/consumer-apps
DLP® Products www.dlp.com Energy and Lighting www.ti.com/energy
DSP dsp.ti.com Industrial www.ti.com/industrial
Clocks and Timers www.ti.com/clocks Medical www.ti.com/medical
Interface interface.ti.com Security www.ti.com/security
Logic logic.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense
Power Mgmt power.ti.com Transportation and www.ti.com/automotive
Automotive
Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video
RFID www.ti-rfid.com Wireless www.ti.com/wireless-apps
RF/IF and ZigBee® Solutions www.ti.com/lprfTI E2E Community Home Page e2e.ti.com
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2011, Texas Instruments Incorporated