TEXAS INSTRUMENTS PTV03020W Technical data

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18-A, 3.3-V INPUT NONISOLATED WIDE-OUTPUT ADJUST SIP MODULE

FEATURES APPLICATIONS

• Up to 18-A Output Current

• 3.3-V Input Bus

• Wide-Output Voltage Adjust

(0.8 V to 2.5 V)

• Efficiencies up to 96%

• On/Off Inhibit

• Output Voltage Sense

• Prebias Start-Up

• Undervoltage Lockout

• Auto-Track™ Sequencing

• Output Overcurrent Protection (Nonlatching,

Auto-Reset)

• Overtemperature Protection

• Operating Temperature: –40 ° C to 85 ° C

• Safety Agency Approvals: UL/cUL 60950,

EN60950 VDE (Pending)

• POLA™ Compatible

• Multivoltage Digital Systems

• High-Density Logic Circuits

• High-End Computers and Servers

• 3.3-V Intermediate Bus Architectures

PTV03020W

SLTS243 – FEBRUARY 2005

DESCRIPTION

The PTV03020W is a ready-to-use nonisolated power module, and part of a new class of complete dc/dc switching regulators from Texas Instruments. These regulators combine high performance with double-sided, surface-mount construction, to give designers the flexibility to power the most complex multiprocessor digital systems using off-the-shelf catalog parts.

The PTV03020W series is produced in a 12-pin, single in-line pin (SIP) package. The SIP footprint minimizes board space, and offers an alternate package option for space conscious applications. Operating from a 3.3-V input bus, the series provides step-down conversion to a wide range of output voltages, at up to 18 A of output current. The output voltage can be set to any value over the range, 0.8 V to 2.5 V, using a single external resistor.

This series includes Auto-Track™. Auto-Track simplifies the task of supply-voltage sequencing in a power system by enabling the output voltage of multiple modules to accurately track each other, or any external voltage, during power up and power down.

Other operating features include an on/off inhibit, and the ability to start up into an existing output voltage or prebias. For improved load regulation, an output voltage sense is provided. A nonlatching overcurrent trip and overtemperature shutdown protect against load faults.

Target applications include complex multivoltage, multiprocessor systems that incorporate the industry's high-speed microprocessors, bus drivers, and the TMS320™ DSP family.

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.

POLA, Auto-Track, 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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Track

GND

9 7

3, 4

81, 210, 11

5, 6

GND GNDInhibit

Track Sense

PTV03020W

Inhibit

V Adj

Sense

GND

C1*

680 Fm

(Required)

C2*

22 Fm

Ceramic

(Required)

C3*

330 Fm

(Optional)

SET

0.05 W

(Required)

See the Application Information section for capacitor recommendations.

SET

PTV03020W

SLTS243 – FEBRUARY 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.

STANDARD APPLICATION

ORDERING INFORMATION

PTV03020 (Basic Model)

Output Voltage Part Number DESCRIPTION Package

0.8 V – 2.5 V (Adjustable) PTV03020WAH Vertical T/H EVC

(1) See the applicable package drawing for dimensions and PC board layout.

(1)

ABSOLUTE MAXIMUM RATINGS

over operating free-air temperature range unless otherwise noted

(Track)

stg

(INH)

(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2) This product is NOT compatible with surface-mount reflow solder processes.

Track input voltage –0.3 V to VI+0.3 V Operating temperature range Over VIrange –40 ° C to 85 ° C Lead temperature 5 seconds 260 ° C Storage temperature –40 ° C to 125 ° C Inhibit input voltage –0.3 V to VI+ 0.3 V

(1)

PACKAGE SPECIFICATIONS

PTV03020W (Suffix AH)

Weight 5.5 grams Flammability Meets UL 94 V-O Mechanical shock Per Mil-STD-883D, Method 2002.3, 1 ms, 1/2 sine, mounted 500 Gs Mechanical vibration Mil-STD-883D, Method 2007.2, 20 Hz - 2000 Hz 10 Gs

(1) Qualification limit.

UNIT

(2)

(1)

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PTV03020W

SLTS243 – FEBRUARY 2005

ELECTRICAL CHARACTERISTICS

operating at 25 ° C free-air temperature, VI= 3.3 V, VO= 2.5 V, C1 = 680 µF, C2 = 22 µF, C3 = 0 µF, and IO= IOmax (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Output current Natural convection airflow 0 18 Input voltage range Over IOload range 2.95

(2)

Set-point voltage tolerance ± 2% Temperature variation –40 ° C < TA< 85 ° C ± 0.5%

Line regulation Over VIrange ± 5 mV Load regulation Over IOrange ± 5 mV Total output variation Includes set-point, line, load, –40 ° C ≤ TA≤ 85 ° C ± 3 Adjust range Over VIrange 0.8 2.5 V

= 2.21 k Ω , VO= 2.5 V 95%

SET

= 5.49 k Ω , VO= 1.8 V 92%

SET

= 8.87 k Ω , VO= 1.5 V 90%

η Efficiency IO= 12 A

Output voltage ripple (pk-pk)

20-MHz bandwidth 20 mV

SET

= 17.4 k Ω , VO= 1.2 V 88%

SET

= 36.5 k Ω , VO= 1 V 86%

SET

= Open, VO= 0.8 V 83%

SET

IO(trip) Overcurrent threshold Reset, followed by auto-recovery 35 A

1-A/µs load step, 50 to 100% IOmax, C3 = 330 µF

Transient response Recovery time 70 µs

Voover/undershoot 120 mV

Track control (pin 9)

UVLO Undervoltage lockout V

Inhibit control (pin 12) VILInput low voltage –0.2 0.6

IILInput low current Pin to GND –0.13 mA Control slew-rate limit C3 ≤ C3 (max) 1 V/ms VIincreasing 2.8 2.95 VIdecreasing 2.2 2.7 VIHInput high voltage VI– 0.5 Open

Referenced to GND V

IILInput low current Pin to GND –0.24 mA

II(stby) Input standby current Inhibit (pin 12) to GND, Track (pin 9) open 10 mA

MTBF Reliability 5 106Hr

Switching frequency Over VIand IOranges 250 300 340 kHz

External input capacitance µF

External output capacitance

Capacitance value µF

(C3)

Nonceramic (C1) 680

Ceramic (C2) 22

Nonceramic 0 330

Ceramic 0 300

Equivalent series resistance (nonceramic) 4

(5) (5)

(6)

(8)

Per Telcordia SR-332, 50% stress, TA= 40 ° C, ground benign

(1)

3.6 V

(3)

(4)

(7)

11,000

m Ω

(1) See thermal derating curves for safe operating area (SOA), or consult factory for appropriate derating. (2) The minimum input voltage is 2.95 V or VO+ 0.65 V, whichever is greater. (3) 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.

. The stated limit is unconditionally met if R

SET

(4) This control pin is pulled up to the input voltage, VI. If this input 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 22-µF high-frequency ceramic capacitor and 680-µF electrolytic input capacitor are required for proper operation. The electrolytic

capacitor must be rated for 750 mArms minimum ripple current. Consult the Application Information for further guidance on capacitor selection.

(6) An external output capacitor is not required for basic operation. Adding 330 µF of distributed capacitance at the load improves the

transient response.

(7) This is the calculated maximum. The minimum ESR limitation often results in a lower value. Consult the Application Information for

further guidance.

(8) This is the typical ESR for all the electrolytic (nonceramic) output capacitance. Use 7 m Ω as the minimum when using maximum-ESR

values to calculate.

has a

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100

0 3 6 9 12 15 18

Efficiency - %

I - Output Current - A

V = 2.5 V

V = 1.5 V

V = 0.8 V

V = 1 V

0 3 6 9 12 15 18

V - Output Ripple Voltage - mV

O PP

I - Output Current - A

V = 2.5 V

V = 1 V

V = 1.5 V

V = 0.8 V

2 0

3 0

4 0

6 0

8 0

9 0

0 3 6 9 12 15 18

Air Temperature - C

I - Output Current - A

400 LFM

200 LFM

100 LFM

Nat Conv

Air Flow

0 3 6 9 12 15 18

P - Power Dissipation - W

I - Output Current - A

V = 2.5 V

V = 0.8 V

PTV03020W

SLTS243 – FEBRUARY 2005

TYPICAL CHARACTERISTICS (3.3-V INPUT)

EFFICIENCY OUTPUT VOLTAGE RIPPLE

vs vs

OUTPUT CURRENT OUTPUT CURRENT

Figure 1. Figure 2.

POWER DISSIPATION TEMPERATURE DERATING

vs vs

OUTPUT CURRENT OUTPUT CURRENT

(9) (10)

(9) 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 .

(10) The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum

operating temperatures. The airflow direction is parallel to the long axis of the module. Derating limits apply to modules soldered directly to a 100 mm x 100 mm double-sided PCB with 2 oz. copper. Applies to Figure 4 .

Figure 3. Figure 4.

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PIN 1 PIN 5

PIN 12

TERMINAL

NAME NO.

GND 1, 2, 10, 11

Inhibit 12

VoAdjust 8

VoSense 7

Track 9

5, 6 The positive input voltage power node to the module, which is referenced to common GND. 3, 4 The regulated positive power output with respect to the GND node.

PTV03020W

SLTS243 – FEBRUARY 2005

DEVICE INFORMATION

TERMINAL FUNCTIONS

DESCRIPTION

This is the common ground connection for the VIand VOpower connections. It is also the 0-Vdc reference for the control inputs.

The Inhibit pin is an open-collector/drain, active-low 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 feature is not used, the control pin should be left open-circuit. The module then produces an output voltage whenever a valid input source is applied.

A 1% resistor must be connected directly between this pin and GND (pin 1 or 2) to set the output voltage of the module higher than its lowest value. The temperature stability of the resistor should be 100 ppm/ ° C (or better). The set-point range is 0.8 V to 3.6 V. The resistor value can be calculated using a formula. If this input is left open-circuit, the output voltage defaults to its lowest value. For further information, consult the related application note.

The specification table gives the standard resistor values for a number of common output voltages.

The sense input allows the regulation circuit to compensate for voltage drop between the module and the load. For optimal voltage accuracy VoSense should be connected to VO. It can also be left disconnected.

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 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. Consult the related Application Information for further guidance.

Front View of Module

Figure 5. Pin Terminal Locations

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PTV03020W

SLTS243 – FEBRUARY 2005

APPLICATION INFORMATION

Capacitor Recommendations for the PTV03020W Power Module

Input Capacitors

The required input capacitors are a 22-µF ceramic and a minimum of 680-µF electrolytic type. For V IO> 11 A , the 680-µF capacitance must be rated for 750 mArms ripple current capability. For all other conditions, the ripple current rating must be at least 500 mArms. Where applicable, Table 1 gives the maximum output voltage and current limits for a capacitor's rms ripple current rating.

The above ripple current requirements are conditional that the 22-µF ceramic capacitor is present. The 22-µF X5R/X7R ceramic capacitor is necessary to reduce both the magnitude of ripple current through the electroytic capacitor and the amount of ripple current reflected back to the input source. Ceramic capacitors should be located within 0.5 inch. (1,3 cm) of the module's input pins. Additional ceramic capacitors can be added to reduce the RMS ripple current requirement for the electrolytic capacitor.

Ripple current (Arms) rating, less than 100-m Ω equivalent series resistance (ESR), and temperature are the major considerations when selecting input capacitors. Unlike polymer-tantalum capacitors, regular tantalum capacitors have a recommended minimum voltage rating of 2 × (max. dc voltage + ac ripple). This is standard practice to ensure reliability. Only a few tantalum capacitors were found to have sufficient voltage rating to meet this requirement. At temperatures below 0 ° C, the ESR of aluminum electrolytic capacitors increases. For these applications, Os-Con, polymer-tantalum, and polymer-aluminum types should be considered.

Output Capacitor (Optional)

For applications with load transients (sudden changes in load current), regulator response benefits from external output capacitance. The recommended output capacitance of 330 µF allows the module to meet its transient response specification. 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 are above 0 ° C. For operation below 0 ° C, tantalum-, ceramic-, or Os-Con-type capacitors are recommended. When using one or more nonceramic capacitors, the calculated equivalent ESR should be no lower than 4 m Ω (7 m Ω using the manufacturer's maximum ESR for a single capacitor). A list of preferred low-ESR-type capacitors are identified in Table 1 .

> 1 V and

Ceramic Capacitors

Above 150 kHz, the performance of aluminum electrolytic capacitors is less effective. Multilayer ceramic capacitors have 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 capacitance does not exceed approximately 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 only be used on the output bus, 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 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 have no 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 is encountered before the maximum capacitance value is reached.

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.

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