TEXAS INSTRUMENTS PTH08T210W Technical data

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PTH08T210W

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SLTS262B–OCTOBER 2005 – REVISED NOVEMBER 2005

30-A, 5.5-V to 14-V INPUT, NON-ISOLATED,

WIDE OUTPUT ADJUST, POWER MODULE w/TurboTrans™

FEATURES

• Up to 30-A Output Current • TurboTrans™ Technology

• 5.5-V to 14-V Input Voltage • Designed to meet Ultra-Fast Transient

• Wide-Output Voltage Adjust (0.7 V to 3.6 V)

• Efficiencies up to 96%

•±1.5% Total Output Voltage Variation

• On/Off Inhibit

• Differential Output Voltage Remote Sense

• Adjustable Undervoltage Lockout

• Output Overcurrent Protection

(Nonlatching, Auto-Reset)

• Operating Temperature: –40°Cto85°C

• Safety Agency Approvals:

– UL 1950, CSA 22.2 950, EN60950 VDE

(Pending)

Requirements up to 300 A/µs

• Auto-Track™ Sequencing

• Multi-Phase, Switch-Mode Topology

APPLICATIONS

• Complex Multi-Voltage Systems

• Microprocessors

• Bus Drivers

DESCRIPTION

The PTH08T210W is a high-performance 30-A rated, non-isolated power module which utilizes a multi-phase, switch-mode topology. This module represents the 2nd generation of the PTH series power modules which include a reduced footprint and improved features.

Operating from an input voltage range of 5.5 V to 14 V, the PTH08T210W requires a single resistor to set the output voltage to any value over the range, 0.7 V to 3.6 V. The wide input voltage range makes the PTH08T210W particularly suitable for advanced computing and server applications that uses a loosely regulated 8-V to 12-V intermediate distribution bus. The module uses double-sided surface mount construction to provide a low profile and compact footprint. Package options include both through-hole and surface mount configurations that are lead (Pb) – free and RoHS compatible.

A new feature included in this 2nd generation of PTH and PTV modules is TurboTrans™ technology (patent pending). TurboTrans allows the transient response of the regulator to be optimized externally, resulting in a reduction of output voltage deviation following a load transient and a reduction in required output capacitance. This feature also offers enhanced stability when used with ultra-low ESR output capacitors.

The PTH08T210W incorporates a comprehensive list of standard features. They include on/off inhibit, a differential remote output voltage sense which ensures tight load regulation, and an output overcurrent and overtemperature shutdown to protect against load faults. A programmable undervoltage lockout allows the turn-on voltage threshold to be customized. AutoTrack™ sequencing is a feature which simplifies the simultaneous power-up and power-down of multiple modules in a power system by allowing the outputs to track a common voltage.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

TurboTrans, AutoTrack, TMS320 are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

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PTH08T210W

SLTS262B–OCTOBER 2005 – REVISED NOVEMBER 2005

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.

Track

TurboTranst

R 1%

0.05 W

Inhibit

GND

A. R

2,6

Track

PTH08T210W

INH/UVLO

UVLO

0.05 W (Opional)

is required to set the output voltage higher than 0.7 V. See the Electrical Characteristics table.

SET

470 µF (Required)

GND

7,83,4

VOAdj

+Sense

−Sense

SET

0.05 W (Required)

5, 9

(Optional)

470 µF (Required)

+Sense

−Sense

GND

UDG−05097

L O A D

ORDERING INFORMATION

For the most current package and ordering information, see the Package Option Addendum at the end of this datasheet, or see the TI website at www.ti.com.

ENVIRONMENTAL AND ABSOLUTE MAXIMUM RATINGS

(Voltages are with respect to GND)

UNIT UNIT

Signal input voltage Track control (pin 14) –0.3 to VI+0.3 V

(1) During reflow of surface mount package version do not elevate peak temperature of the module, pins or internal components above the

Operating temperature range Over VIrange –40 to 85

Wave soldering temperature PTH08T210WAD 260

wave

Solder reflow temperature

reflow

Storage temperature –40 to 125

stg

Surface temperature of module body or pins (20 seconds)

PTH08T210WAS 235

PTH08T210WAZ 260

(1)

Mechanical shock Per Mil-STD-883D, Method 2002.3 1 msec, ½ sine, mounted 250

Mechanical vibration Mil-STD-883D, Method 2007.2 20-2000 Hz 15

Weight 8.5 grams

Flammability Meets UL94V-O

stated maximum.

°C

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PTH08T210W

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SLTS262B–OCTOBER 2005 – REVISED NOVEMBER 2005

ELECTRICAL CHARACTERISTICS

TA=25°C, VI=12V,VO= 3.3 V, CI= 470 µF, CO= 470 µF OS-CON, and IO=IOmax (unless otherwise stated)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Output current A

Input voltage range Over IOrange 5.5 14 V

Output adjust range Over I

range 0.7 3.6 V

Set-point voltage tolerance ±1

Temperature variation –40°C<TA<85°C ±0.3 %V

Line regulation Over VIrange ±4mV

Load regulation Over I

range ±7mV

Total output variation Includes set-point, line, load, –40°C ≤ T

=5.5Vto14V

η Efficiency R

Ripple (peak-to-peak) 20-MHz bandwidth 25 mV

LIM

∆V

trTT

∆V

UVLO

Overcurrent threshold Reset, followed by auto-recovery 55 A

Transient response

trTT

Track input current (pin 14) Pin to GND –130

/dt Track slew rate capability CO≤ CO(max) 1V/ms

track

Adjustable Undervoltage

ADJ

lockout (pin 1)

Inhibit control (pin 1) Input low voltage (V

Input standby current Inhibit (pin 1) to GND, Track (pin 14) open 3 mA

Switching frequency Over VIand IOranges 480 kHz

External input capacitance 470

=26A

w/o TurboTrans Recovery time 50 µs

=470 µF

1 A/µs load step 50 to 100% IOmax

w/o TurboTrans Recovery time 50 µs C

=940 µF, Type C

w/ TurboTrans Recovery time 50 µs

=940 µF, Type C

Pin 1 open V

Input high voltage (V

Input low current (I

)-0.20.6

)125µA

(1) The set-point voltage tolerance is affected by the tolerance and stability of R

tolerance of 1% with 100 ppm/°C or better temperature stability.

(2) A low-leakage (<100 nA), open-drain device, such as MOSFET or voltage supervisor IC, is recommended to control pin 14. The

open-circuit voltage is less than 8 Vdc.

(3) This control pin has an internal pullup to the input voltage VI. If it is left open-circuit, the module operates when input power is applied. A

small, low-leakage (<100 nA) MOSFET is recommended for control. For additional information, see the related application note.

(4) A 470 µF electrolytic input capacitor is required for proper operation. The capacitor must be rated for a minimum of 500 mA rms of ripple

current.

25°C, natural convection 0 25

60°C, 200 LFM 0 30

≤ 85°C ±1.5

=1.62kΩ,VO= 3.3 V 93%

SET

=5.23kΩ,VO= 2.5 V 91%

SET

= 12.7 kΩ,VO= 1.8 V 89%

SET

= 19.6 kΩ,VO= 1.5 V 89%

SET

= 35.7 kΩ,VO= 1.2 V 87%

SET

= 63.4 kΩ,VO= 1.0 V 84%

SET

Open, V

= 0.7 V 80%

VOover/undershoot 150 mV

VOover/undershoot 125 mV

VOover/undershoot 85 mV

increasing 5 5.5

decreasing 4.1

– 0.5 Open

(4)

. The stated limit is unconditionally met if R

SET

(1)

(2)

(3)

SET

has a

µA

µF

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PTH08T210W

SLTS262B–OCTOBER 2005 – REVISED NOVEMBER 2005

ELECTRICAL CHARACTERISTICS (continued)

TA=25°C, VI=12V,VO= 3.3 V, CI= 470 µF, CO= 470 µF OS-CON, and IO=IOmax (unless otherwise stated)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Capacitance (6)

w/out TurboTrans

MTBF Reliability Per Bellcore TR-332, 50% stress, TA=40°C, ground benign 3.6

External output Equivalent series resistance (nonceramic) 3 capacitance

w/ TurboTrans

Value

Capacitance Value µF

Capacitance × ESR product (C

Nonceramic 470

Ceramic 5000

× ESR) µF × mΩ

(5)

(7)

See TT 12,000

(8) (9)

chart

(5) A minimum value of external output capacitor is required for proper operation. Adding additional capacitance at the load further improves

transient response. See the Capacitor Application Information section for more guidance.

(6) This is the calculated maximum. This value includes both ceramic and non-ceramic capacitors. The minimum ESR requirement often

results in a lower value. See the related Application Information for more guidance.

(7) This is the minimum ESR for all the electrolytic (nonceramic) capacitance. Use 5 mΩ as the minimum when using manufacturer's

max-ESR values to calculate.

(8) Minimum capacitance will be determined by your transient deviation requirement. A corresponding resistor, RTTis required for proper

operation. See the TurboTrans Selection section for guidance in selecting the capacitance and RTTvalue. (9) This is the calculated maximum. This value includes both ceramic and non-ceramic capacitors. (10) When calculating the Capacitance × ESR product use the capacitance and ESR values of a single capacitor. For an output capacitor

bank of several capacitor types and values, calculate the C × ESR product using the values of the capacitor that makes up the majority

of the capacitance.

12,000

10,000

(10)

µF

mΩ

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PTH08T210W

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SLTS262B–OCTOBER 2005 – REVISED NOVEMBER 2005

PTH08T210W

(TOP VIEW)

432

5 6 7 8 9 10

TERMINAL FUNCTIONS

TERMINAL

NAME NO.

GND

(1)

Inhibit

UVLO adjust

VoAdjust 12 range for the output voltage is from 0.7 V to 3.6 V. If left open circuit, the output voltage will default to its lowest

+ Sense 10

– Sense 11

Track 14

TurboTrans™ 13

(1) Denotes negative logic: Open = Normal operation, Ground = Function active

DESCRIPTION

2, 6 The positive input voltage power node to the module, which is referenced to common GND.

5, 9 The regulated positive power output with respect to the GND.

3, 4 This is the common ground connection for the VIand VOpower connections. It is also the 0 Vdcreference for the 7, 8 control inputs.

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 produces an output whenever a valid input source is applied. This input is not compatible with TTL logic

devices and should not be tied to VIor any other voltage.

This pin is also used for input undervoltage lockout (UVLO) programming. Connecting a resistor from this pin to GND (pin 3) allows the ON threshold of the UVLO to be adjusted higher than the default value. For more information, see the Application Information section.

A 0.1 W 1% resistor must be directly connected between this pin and pin 8 (GND) to set the output voltage to a value higher than 0.7 V. The temperature stability of the resistor should be 100 ppm/°C (or better). The setpoint

value. For further information, on output voltage adjustment see the related application note. The specification table gives the preferred resistor values for a number of standard output voltages.

The sense input allows the regulation circuit to compensate for voltage drop between the module and the load. For optimal voltage accuracy, +Sense must be connected to VO, very close to the load.

The sense input allows the regulation circuit to compensate for voltage drop between the module and the load. For optimal voltage accuracy, –Sense must be connected to GND (pin 8), very close to the load.

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 module's output voltage follows 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 VI.

NOTE: Due to the undervoltage lockout feature, the output of the module cannot follow its own input voltage during power up. For more information, see the related application note.

This input pin adjusts the transient response of the regulator. To activate the TurboTrans™ feature, a 1%, 50 mW resistor must be connected between this pin and pin 10 (+Sense) very close to the module. For a given value of output capacitance, a reduction in peak output voltage deviation is achieved by using this feature. If unused, this pin must be left open-circuit. External capacitance must never be connected to this pin. The resistance requirement can be selected from the TurboTrans™ resistor table in the Application Information section.

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0 5 10 15 20 25 30

VO = 1.5 V

VO = 1.2 V

VO = 0.7 V

− Output Current − A

VO = 2.5 V

VO = 1.8 V

VO = 3.3 V

− Power Dissipation − W

0 5 10 15 20 25 30

− Ambient Temperature − C

IO− Output Current − A

VO= 1.2 V

400 LFM

200 LFM

100 LFM

Nat Conv

PTH08T210W

SLTS262B–OCTOBER 2005 – REVISED NOVEMBER 2005

TYPICAL CHARACTERISTICS

CHARACTERISTIC DATA ( VI=12V)

EFFICIENCY OUTPUT RIPPLE POWER DISSIPATION

vs vs vs

LOAD CURRENT LOAD CURRENT LOAD CURRENT

100

Efficiency − %

0 5 10 15 20 25 30

VO = 1.5 V

VO = 0.7 V

IO − Output Current − A

Figure 1. Figure 2. Figure 3.

VO = 1.8 V

VO = 2.5 V

VO = 3.3 V

VO = 1.2 V

− Output Voltage Ripple − V

VO = 3.3 V

VO = 1.5 V

VO = 1.2 V

0 5 10 15 20 25 30

IO − Output Current − A

VO = 2.5 V

VO = 1.8 V

VO = 0.7 V

(1)(2)

AMBIENT CURRENT AMBIENT TEMPERATURE

vs vs

OUTPUT CURRENT OUTPUT CURRENT

− Ambient Temperature − C A

Nat Conv

0 5 10 15 20 25 30

100 LFM

200 LFM

400 LFM

VO= 3.3 V

IO− Output Current − A

Figure 4. Figure 5.

(1) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the

converter. Applies to Figure 1, Figure 2, and Figure 3.

(2) The temperature derating 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 100 mm × 100 mm double-sided PCB with 2 oz. copper. Applies to Figure 5 and Figure 4.

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0 5 10 15 20 25 30

VO = 1.5 V

VO = 1.2 V

VO = 0.7 V

IO − Output Current − A

VO = 2.5 V

VO = 1.8 V

VO = 3.3 V

− Power Dissipation − W

0 5 10 15 20 25 30

400 LFM

200 LFM

Nat Conv

− Ambient Temperature − C

IO− Output Current − A

VO= 1.2 V

100 LFM

PTH08T210W

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TYPICAL CHARACTERISTICS

CHARACTERISTIC DATA ( VI=8V)

EFFICIENCY OUTPUT RIPPLE POWER DISSIPATION

vs vs vs

LOAD CURRENT LOAD CURRENT LOAD CURRENT

100

Efficiency − %

VO = 1.2 V

VO = 1.5 V

VO = 0.7 V

0 5 10 15 20 25 30

− Output Current − A

Figure 6. Figure 7. Figure 8.

VO = 3.3 V

VO = 2.5 V

VO = 1.8 V

AMBIENT TEMPERATURE AMBIENT TEMPERATURE

vs vs

OUTPUT CURRENT OUTPUT CURRENT

VO = 1.5 V

− Output Voltage Ripple − V O

0 5 10 15 20 25 30

VO = 1.8 V

VO = 0.7 V

IO − Output Current − A

VO = 3.3 V

VO = 2.5 V

VO = 1.2 V

SLTS262B–OCTOBER 2005 – REVISED NOVEMBER 2005

(1)(2)

(1) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the

converter. Applies to Figure 6, Figure 7, and Figure 8.

(2) The temperature derating 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 100 mm × 100 mm double-sided PCB with 2 oz. copper. Applies to Figure 9 and Figure 10.

− Ambient Temperature − C A

0 5 10 15 20 25 30

Nat Conv

100 LFM

200 LFM

400 LFM

VO= 3.3 V

IO− Output Current − A

Figure 9. Figure 10.

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PTH08T210W

SLTS262B–OCTOBER 2005 – REVISED NOVEMBER 2005

APPLICATION INFORMATION

CAPACITOR RECOMMENDATIONS FOR THE PTH08T210W POWER MODULE

Input Capacitor (Required)

The size and value of the input capacitor is determined by the converter’s transient performance capability. The minimum amount of required input capacitance is 470 µF, with an RMS ripple current rating of 500 mA. This minimum value assumes that the converter is supplied with a responsive, low inductance input source. This source should have ample capacitive decoupling, and be distributed to the converter via PCB power and ground planes.

For high-performance/transient applications, or wherever the input source performance is degraded, 1000 µF of input capacitance is recommended. The additional input capacitance above the minimum level insures an optimized performance.

Ripple current (rms) rating, less than 100 mΩ of equivalent series resistance (ESR), and temperature are the main considerations when selecting input capacitors. The ripple current reflected from the input of the PTH08T210W module is moderate to low. Therefore any good quality, computer-grade electrolytic capacitor will have an adequate ripple current rating.

Regular tantalum capacitors are not recommended for the input bus. These capacitors require a recommended minimum voltage rating of 2 × (maximum dc voltage + ac ripple). This is standard practice to ensure reliability. No tantalum capacitors were found with a sufficient voltage rating to meet this requirement. When the operating temperature is below 0°C, the ESR of aluminum electrolytic capacitors increases. For these applications, Os-Con, poly-aluminum, and polymer-tantalum types should be considered. Adding one or two ceramic capacitors to the input attenuates high-frequency reflected ripple current.

TurboTrans Output Capacitor

The PTH08T210W requires a minimum output capacitance of 470 µF. The required capacitance above 470µF will be determined by actual transient deviation requirements.

TurboTrans allows the designer to optimize the capacitance load according to the system transient design requirement. High quality, ultra-low ESR capacitors are required to maximize TurboTrans effectiveness. Capacitors with a capacitance (µF) × ESR (mΩ) product of ≤ 10,000 mΩ×µF are required.

Working Example:

A bank of 6 identical capacitors, each with a capacitance of 680 µF and 5 mΩ ESR, has a C × ESR product of 3400 µFxmΩ (680 µF × 5 mΩ).

Using TurboTrans in conjunction with the high quality capacitors (capacitance (µF) × ESR (mΩ)) reduces the overall capacitance requirement while meeting the minimum transient amplitude level.

Table 1 includes a preferred list of capacitors by type and vendor. See the Output Bus / TurboTrans column.

Note: See the TurboTrans Technology Application Notes within this document for selection of specific capacitance.

Non-TurboTrans Output Capacitor

The PTH08T210W requires a minimum output capacitance of 470 µF. Non-TurboTrans applications must observe minimum output capacitance ESR limits.

A combination of 200 µF of ceramic capacitors plus low ESR (15 mΩ to 30 mΩ) Os-Con electrolytic/tantalum type capacitors can be used. When using Polymer tantalum types, tantalum type, or Oscon types only, the capacitor ESR bank limit is 3 mΩ to 5 mΩ. (Note: no ceramic capacitors are required). This is necessary for the stable operation of the regulator. Additional capacitance can be added to improve the module's performance to load transients. High quality computer-grade electrolytic capacitors are recommended. Aluminum electrolytic capacitors provide adequate decoupling over the frequency range, 2 kHz to 150 kHz, and are suitable when ambient temperatures are above -20°C. For operation below -20°C, tantalum, ceramic, or Os-Con type capacitors are necessary.

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APPLICATION INFORMATION (continued)

When using a combination of one or more non-ceramic capacitors, the calculated equivalent ESR should be no lower than 2 mΩ (4 mΩ when calculating using the manufacturer’s maximum ESR values). A list of preferred low-ESR type capacitors, are identified in Table 1.

Ceramic Capacitors

Above 150 kHz the performance of aluminum electrolytic capacitors is less effective. Multilayer ceramic capacitors have very low ESR and a resonant frequency higher than the bandwidth of the regulator. They can be used to reduce the reflected ripple current at the input as well as improve the transient response of the output.

When used on the output their combined ESR is not critical as long as the total value of ceramic capacitors, with values between 10 µF and 100 µF, does not exceed 5000 µF (non-TurboTrans). In TurboTrans applications, when ceramic capacitors are used on the output bus, total capacitance including bulk and ceramic types is not to exceed 12,000 µF.

Tantalum, Polymer-Tantalum Capacitors

Tantalum type capacitors are only used on the output bus, and are recommended for applications where the ambient operating temperature is less than 0°C. The AVX TPS series and Kemet 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 higher ESR, reduced power dissipation, and lower ripple current capability. These capacitors are also less reliable due to their reduced power dissipation and surge current ratings. Tantalum capacitors that have no stated ESR or surge current rating are not recommended for power applications.

Capacitor Table

Table 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 ensure both optimum regulator performance and long capacitor life.

Designing for Fast Load Transients

The transient response of the dc/dc converter has been characterized using a load transient with a di/dt of

2.5 A/µs. The typical voltage deviation for this load transient is given in the Electrical Characteristics table using the minimum required 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 low ESR ceramic capacitor decoupling. Generally, with 50% load steps at > 100 A/µs, adding multiple 10 µF ceramic capacitors, 3225 case size, plus 10 × 1 µF, including numerous high frequency ceramics (≤ 0.1 µF) are all that is required to soften the transient higher frequency edges. Special attention is essential with regards to location, types, and position of higher frequency ceramic and lower ESR bulk capacitors. DSP, FPGA and ASIC vendors identify types, location and capacitance required for optimum performance of the high frequency devices. The details regarding the PCB layout and capacitor/component placement are important at these high frequencies. Low impedance buses and unbroken PCB copper planes with components located as close to the high frequency processor are essential for optimizing transient performance. In many instances additional capacitors may be required to insure and minimize transient aberrations.

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