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PT6721--12V
14 Amp Programmable Integrated Switching Regulator
SLTS101
(Revised 6/30/2000)
* +12V input * 5-bit Programmable: 1.3V to 3.5V@14A * High Efficiency * Input Voltage Range: 10.8V to 13.2V * Differential Remote Sense * 23-pin Space Saving Package * Solderable Copper Case * Short Circuit Protection * Over-Voltage Drive * Power Good Signal
Patent pending on package assembly
The PT6721 is a new high-performance, 14 Amp Integrated Switching Regulators (ISRs) housed in a unique, 23-pin space-saving package. The PT6721 operates from a standard 12V power bus to provide a high performance low-voltage power source for the industry's latest high-speed, low-voltage Ps and bus drivers. The output voltage of the PT6721 can be easily programmed from 1.3V to 3.5V with a 5-bit input compatible with Intel's Pentium(R) Processor family.
Standard Application
PROGRAMMING PINS
VID0 VID1 VID2 VID3 VID4 REMOTE SENSE (+)
76543 1 23
PT6700 Product Family
OVP DRV
Input Vout Voltage Adjust PT6701 5V 3.3V 5V 5V 12V 12V VID VID Resistor Resistor VID Resistor PT6702 PT6705
OVP/ PWRGD
Needs 12VBias
VIN
L1
10 - 12
1H R1 CIN PWR GOOD GND STBY* +
2
PT6721
14 - 18 8 13
19 - 22
VOUT

COUT
+
LOAD
PT6715 PT6721
GND
REMOTE SENSE (-)
PT6725
Cin Cout L1 R1
Specifications
Characteristics (Ta = 25C unless noted) Output Current Input Voltage Range Output Voltage T olerance Short-Circuit Threshold Line Regulation Load Regulation Vo Ripple/Noise Transient Response with Cout = 330F Efficiency
= Required 1000F electrolytic (See footnotes) = Required 330F electrolytic (See footnotes) = Optional 1H input choke (See footnotes) = Required 10k pull-up when using Pwr Good signal. Pwr good output is high when the output voltage is within specification.
PT6721 SERIES
Symbols Io Vin Vo Isc Regline Regload Vn ttr Vos Conditions Ta = +60C, 200 LFM, pkg N Ta = +25C, natural convection 0.1A I o 14A Vin = +12V, I o = 14A -40C Ta +85C Vin = +12V 10.8V Vin 13.2V, Io = 14A Vin = +12V, 0.1 Io 14A Vin = +12V, Io = 14A Io step between 7A and 14A Vo over/undershoot Vin = +12V, I o = 9A Vo Vo Vo Vo = 3.3V = 2.5V = 1.8V = 1.5V Min 0.1 (1) 0.1 (1) 10.8 Vo-0.03 -- -- -- -- -- -- -- -- -- -- 300 -40 (2) -40 -- -- -- Typ -- -- -- -- 20 5 10 35 50 70 90 88 83 81 350 -- -- 500 15 26 Max 14 14 13.2 Vo+0.03 30 -- -- -- -- -- -- -- -- -- 400 +85 (3) +125 -- -- -- Units A V V A mV mV mV Sec mV % kHz C C G's G's grams
Switching Frequency Absolute Maximum Operating T emperature Range Storage T emperature Mechanical Shock Mechanical Vibration Weight
o Ta Ts
10.8V Vin 13.2V 0.1A I o 14.0A -- -- Per Mil-STD-883D, Method 2002.3 1 msec, Half Sine, mounted to a fixture Per Mil-STD-883D, Method 2007.2, 20-2000 Hz, Soldered in a PC board
--
--
Notes: (1) (2) (3) (4)
ISR-will operate down to no load with reduced specifications. For operation below 0C, Cin and Cout must have stable characteristics. Use either low ESR tantalum or Oscon(R) capacitors. See Safe Operating Area curves, or contact the factory for appropriate derating. If the Remote Sense Ground is note used, pin 13 must be connected to pin 14 for optimum output voltage accuracy.
External Capacitors: The PT6721 requires a minimum output capacitance of 330F, with a maximum ESR of 50m @100kHz for proper operation. The maximum allowable output capacitance is 15,000F. The input capacitance must be rated for a minimum of 1.6Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required. For more information refer to the application note regarding capacitor selection for this product. Input Filter: An input filter inductor is optional for most applications. The inductor must be sized to handle 5ADC with a typical value of 1H.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT6721--12V
14 Amp Programmable Integrated Switching Regulator
Pin-Out Information
Pin Function
1 2 3 4 5 6 7 8 9 10 11 12 OVP Drive Pwr Good VID0 VID1 VID2 VID3 VID4 STBY#
Do not connect
Programming Information
Pin Function
13 14 15 16 17 18 19 20 21 22 23
#For
Ordering Information
PT6721J = 1.3 to 3.5 Volts J
(For dimensions and PC board layout, see Package Styles 1300 and 1310.)
1.30V 1.35V 1.40V 1.45V 1.50V 1.55V 1.60V 1.65V 1.70V 1.75V 1.80V 1.85V 1.90V 1.95V 2.00V 2.05V
VID3 VID2 VID1 VID0
(4)
VID4=1 VID4=0 Vout Vout
2.0V 2.1V 2.2V 2.3V 2.4V 2.5V 2.6V 2.7V 2.8V 2.9V 3.0V 3.1V 3.2V 3.3V 3.4V 3.5V
Remote Sense Gnd
GND GND GND GND GND Vout Vout Vout Vout
Remote Sense Vout
Vin Vin Vin
1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0
1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0
1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0
1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0
PT Series Suffix (PT1234X)
Case/Pin Configuration Vertical Through-Hole N Horizontal Through-Hole A Horizontal Surface Mount C
STBY pin:open =output enabled ground =output disabled.
Logic 0 = Pin 13 potential (remote sense gnd) Logic 1 = Open circuit (no pull-up resistors) VID3 and VID4 may not be changed while the unit is operating.
TYPICAL 12.0V Input Voltage
Efficiency vs Output Current
100
CHARACTERISTICS Safe Operating Area Curves (Note B)
Vout =3.3V, Pkg Suffix `N'
90.0 80.0
(Note A)
Ambient Temperature ( C)
90
70.0 60.0 50.0 40.0 30.0 20.0
Efficiency - %
80
VOUT 3.3V 2.5V 1.5V
Airflow 200LFM 120LFM 60LFM Nat conv
70
60
50
40 0 2 4 6 8 10 12 14
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
Iout (A)
Iout (A)
Ripple vs Output Current
25
20
Ripple - mV
VOUT
15
10
3.3V 2.5V 1.5V
5
0 0 2 4 6 8 10 12 14
Iout (A)
Power Dissipation vs Output Current
7 6 5
Pd - Watts
VOUT
4 3 2 1 0 0 2 4 6 8 10 12 14
3.3V 2.5V 1.5V
Iout (A)
Note: A All data listed in the above graphs has been developed from actual products tested at 25C. This data is considered typical data for the ISR. Note: B SOA Curves represent the conditions at which internal components are at or below manufacturer's maximum operating temperatures.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Application Notes
PT6721/6725 Series
Capacitor Recommendations for the PT6721 and PT6725 Series Regulators
Input Capacitors The recommended input capacitance is determined by 1.6 ampere minimum ripple current rating and 1000F minimum capacitance. T antalum capacitors listed below cannot be used on the input bus since they are not rated for 12V operation. Ripple current and Equivalent Series Resistance (ESR) values are the major considerations along with temperature when selecting the proper capacitor. Output Capacitors The minimum required output capacitance is 330F with a maximum ESR less than or equal to 50m. Failure to observe this requirement may lead to regulator instability or oscillation. Electrolytic capacitors have poor ripple performance at frequencies greater than 400kHz, but excellent low frequency transient response. Above the ripple frequency ceramic decoupling capacitors are necessary to improve the transient response and reduce any microprocessor high frequency noise components apparent during higher current excursions. Preferred low ESR type capacitor part numbers are identified in the T able 1 below. Tantalum Characteristics
Table 1 Capacitors Characteristic Data
T antalum capacitors are recommended on the output bus but only TPS Series, Sprague 593D/594/595 Series, or Kemet T495/T510 Series. The AVX TPS Series, Sprague Series or Kemet Series tantalum capacitors are recommended over other manufacturer's due to their higher surge current, excellent power dissipation and ripple current ratings. As an example, the TAJ Series by AVX is not recommended. This series exhibits considerably higher ESR, reduced power dissipation and lower ripple current capability. The TAJ Series is a less reliable compared to the TPS series when comparing power dissipation capability. Capacitor Table T able 1 identifies the characteristics of capacitors from a number of vendors with acceptable ESR and ripple current (rms) ratings. The suggested minimum quantities per regulator for both the input and output buses are identified. This is not an extensive capacitor list. The table below is a selection guide for input and output capacitors. Other capacitor vendors are available with comparable RMS ripple current rating and ESR (Equivalent Series Resistance at 100kHz). These critical parameters are necessary to insure both optimum regulator performance and long capacitor life.
Capac i t or Vendor/ Ser i es
Working Voltage Panasonic FC Series FA Series United Chemi -con LFVSeries Nichicon PL Series PM Series Panasonic FC Series Surface Mtg OsconSS/SV Series AVX Tantalum TPS Series Kemet Tantalum T510/T495 Series Sprague Tantalum 594D Series
35V 25V 25V
Capac i t or Char ac t e r i s t i c s
Qu a n t i t y
Value(F)
( ESR) Equi v al e nt Se r i e s Re s i s t anc e
0.043 0.038 0.038
1 0 5 C Ma x i m u m Ri ppl e C u r r e n t ( I r ms )
1655mA 1655mA 1690mA
Phy s i c al S i z e ( mm)
12.5x20 12.5x20 16x15
I nput Bu s
2 1 1
Ou t p u t Bu s
1 2 1
Ve n d o r N u m b e r
680 1000 1000
EEUFC1V681 EEUFC1E102 EEUFC1E102S
35V 35V 16V 35V 25V 35V 35V 25V 35V 10V 10V 10V 10V 10V 10V 10V
680 1000 470 680 1200 1000 1000 1000 470 330 330 330 330 330 220 330
0.034 0.038 0.084/2=042 0.036 0.039 0.034 0038 0.038 0.0430 0.025 0.020 0.100/2=0.050 0.060/2=0.030 0.033 0.070/2=0.035 0.045
1690mA 1630mA 825mA x2 1660mA 1600mA 1770mA 2000mA 2000mA 1690mA 3500mA 3800mA >2500mA >3000mA 1400mA >2000mA 2360mA
12.5x25 16x20 10x16 12.5x25 18x15 16x20 18x16.5 18x16.5 16x16.5 10x10.5 10.3x10.3 7.3L x 5.7W x 4.1H 4.3Wx7.3L x4.0H
2 1 N/R(1) 2 1 1 1 1 2 N/R(1) N/R(1) N/R(1) N/R(1) N/R(1) N/R(1) N/R(1)
1 1 2 1 1 1 1 1 1 1 1 2 2 1 2 1
LXV35VB680M12X25LL LXV35VB102M16X20LL LXV16VB471M10X16LL UPL1V681MHH UPL1E122MHH6 UPM1V102MHH6 EEVFC1V102N EEVFC1E102N EEVFC1V471N 10SS330M( If Output <5V) 10SV330( If Output <5V) Surface Mount(SV) TPSE337M010R0100 TPSV337M010R0060 Surface Mount 510X337M010AS T495X227M0100AS Surface Mount 594D337X0010R2T Surface Mount
7.2L x 6W x 4.1H
Note: (N/R) 10V tantalums are not recommend for the input bus.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
IMPORTANT NOTICE Te xas Instrume nts and its subsidiarie s (TI) re se rve the right to make change s to the ir products or to discontinue any product or se rvice without notice , and advise custome rs to obtain the late st ve rsion of re le vant information to ve rify, be fore placing orde rs, that information be ing re lie d on is curre nt and comple te . All products are sold subje ct to the te rms and conditions of sale supplie d at the time of orde r acknowle dgme nt, including those pe rtaining to warranty, pate nt infringe me nt, and limitation of liability. TI warrants pe rformance of its se miconductor products to the spe cifications applicable at the time of sale in accordance with TI's standard warranty. Te sting and othe r quality control te chnique s are utilize d to the e xte nt TI de e ms ne ce ssary to support this warranty. Spe cific te sting of all parame te rs of e ach de vice is not ne ce ssarily pe rforme d, e xce pt those mandate d by gove rnme nt re quire me nts. Custome rs are re sponsible for the ir applications using TI compone nts. In orde r to minimize risks associate d with the custome r's applications, ade quate de sign and ope rating safe guards must be provide d by the custome r to minimize inhe re nt or proce dural hazards. TI assume s no liability for applications assistance or custome r product de sign. TI doe s not warrant or re pre se nt that any lice nse , e ithe r e xpre ss or implie d, is grante d unde r any pate nt right, copyright, mask work right, or othe r inte lle ctual prope rty right of TI cove ring or re lating to any combination, machine , or proce ss in which such se miconductor products or se rvice s might be or are use d. TI's publication of information re garding any third party's products or se rvice s doe s not constitute TI's approval, warranty or e ndorse me nt the re of.
Copyright (c)
2000, Te xas Instrume nts Incorporate d

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