PT6727

SLTS102A TI | Alldatasheet

Document overview

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Technical content

Features

• Up to 14A Output Current
• +12V Input
• 93% Efficiency (PT6724)
• On/Off Standby Function
• Differential Remote Sense
• Adjustable Output Voltage
• Short Circuit Protection
• 17-pin Space-Saving Package
• Solderable Copper Case Pin-Out Information Pin Function 1V o Adjust

2 STBY*

3 Do Not Connect

8 GND

9 GND

10 GND

11 GND

12 GND

13 V out

14 V out

15 V out

16 V out

• For further information, see application notes.

Description

The PT6725 series of power modules are integrated switching regulators (ISRs), housed in a 17-pin space saving solderable copper package. These modules operate off a 12V input power bus to provide up to 14A of low-voltage power for the indus- try’s latest high-speed, DSPs, µPs, and bus drivers. The series includes the stan- dard output bus voltage options, ranging from 1.2V to 5.0V. The factory preset voltage can also be adjusted over a limit- ed range with a single external resistor. Features include a Standby function, output short circuit protection, and a differential Remote Sense to compensate for voltage drop between the ISR and load. The modules are available in both through-hole and surface mount configu- rations. PT Series Suffix (PT1234x) Case/Pin Order Package Configuration Suffix Code * Vertical N (EMD) Horizontal A (EMA) SMD C (EMC) * Previously known as package styles 1340/50. (Reference the applicable package code drawing for the dimensions and PC board layout)

Ordering Information

PT6724/G72= 5.0 Volts PT6725/G72= 3.3 Volts PT6726/G72= 2.5 Volts PT6727/G72= 1.8 Volts PT6728/G72= 1.5 Volts PT6729/G72= 1.2 Volts Cin = Required 1000µF electrolytic Cout= Required 330µF electrolytic L1 = Optional 1µH input choke PT6725 4 - 6 8 - 12 13 - 16 1µH C OUT +C IN + 7 LOAD REMOTE SENSE (+) REMOTE SENSE (-) GND VOUT Vout Adjust VIN GND STBY* PT6725 Series SLTS102A (Revised 1/14/2002) 14-A 12V-Input A djustable Integrated Switching Regulator

For technical support and more information, see inside back cover or visit www.ti.com PT6725 Series 14-A 12V-Input A djustable Integrated Switching Regulator Specifications (Unless otherwise stated, T a =25°C, Vin =12V, Cin =1,000µF, Cout =330µF, and Io =Iomax) PT6725 SERIES Characteristic Symbol Conditions Min Typ Max Units Output Current I o Ta =+60°C, 200LFM V o ≤2.5V 0.1 (1) —1 4 ATa =+25°C, natural convection V o >2.5V 0.1 (1) —1 3 Input Voltage Range V in Over Io Range 10.8 — 13.2 VDC Set Point Voltage Tolerance V o tol — ±1 ±1.5 (2) %Vo Temperature Variation Reg temp –40° ≤Ta ≤ +85°C, Io =Iomin — ±0.5 — %V o Line Regulation Reg line Over Vin range — ±5 ±10 mV Load Regulation Reg load Over Io range — ±5 ±10 mV Total Output Voltage Variation ∆Votot Includes set-point, line, load, —± 2± 3% V o–40° ≤Ta ≤ +85°C Efficiency η Io =9.0A V o =5.0V — 93 — Vo =3.3V — 90 — Vo =1.5V — 81 — Vo =1.2V — 78 — Vo Ripple (pk-pk) V r 20MHz bandwidth — 35 — mV pp Transient Response t tr 5A/µs load step, 50% to 100% Iomax — 70 — µs ∆Vtr Vo over/undershoot — ±100 — mV Short Circuit Threshold I sc threshold — 20 32 A Switching Frequency ƒ s Over Vin and Io range 300 350 400 kHz Remote On/Off (Pin 2) Referenced to –V in (pin 8) Input High Voltage V IH — — Open (3) V Input Low Voltage V IL –0.1 — +0.4 Input Low Current I IL — –0.5 – mA Standby Input Current I in standby pins 2 & 8 connected — 0.5 1.0 mA External Output Capacitance C out See application schematic 330 — 15,000 µF External Input Capacitance Cin See application schematic 1,000 — — µF Operating Temperature Range T a Over Vin range -40 (4) — +85 (5) °C Storage Temperature T s — -40 — +125 °C Reliability MTBF Per Bellcore TR-332 7.8 — — 10 6 Hrs50% stress, Ta =40°C, ground benign Mechanical Shock — Per Mil-Std-883D, method 2002.3, — 500 — G’s 1ms, half-sine, mounted to a fixture Mechanical Vibration — Mil-Std-883D, Method 2007.2, — 15 (6) —G ’ s20-2000Hz, soldered in PCB Weight — — 23 — grams Flammability — Materials meet UL 94V-0 Notes: (1) The ISR will operate at no load with reduced specifications. (2) If the remote sense feature is not being used, connect the Remote Sense Gnd (pin 7) to GND (pin 8) for optimum output voltag e accuracy. (3) The STBY* control (pin 2) has an internal pull-up and if it is left open circuit the module will operate when input power is applied. The open-circuit voltage is typically the input voltage, Vin. Refer to the application notes for other interface considerations. (4) For operation below 0°C, Cin and Cout must have stable characteristics. Use either low ESR tantalum or Oscon® capacitors. Se e application notes. (5) See Safe Operating Area curves or contact the factory for the appropriate derating. (6) The case pins on through-hole package types (suffixes N & A) must be soldered. For more information see the applicable packa ge outline drawing. Input/Output Capacitors: For proper operation in all applications, the PT6725 series requires a 1,000µF input capacitor (Cin) with a minimum 1.6Arms ripple current rating. And a 330µF output capacitor (Cout) with a maximum ESR of 50mΩ at 100kHz. For transient or dynamic load applications, additional output capacitance may be necessary. The maximum allowable output capacitance is 15,000µF. For more information consult the related application note on capacitor recommendations. Input Inductor: An input filter inductor is optioinal for most applications. The inductor must be sized to handle 6.5ADC with a typical value of 1µH.

For technical support and more information, see inside back cover or visit www.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 Typical Characteristics Characteristic Data; Vin =12V (See Note A) Efficiency vs Output Current Power Dissipation vs Output Current Safe Operating Area; V in =12V (See Note B) Output Ripple vs Output Current PT6725 Series 14-A 12V-Input A djustable Integrated Switching Regulator PT6724, Vo =5.0V PT6725, Vo =3.3V PT6726, Vo =2.5V 0 2 4 6 8 10 12 14 Iout (A ) Ambient Temperature (°C) 200LFM 120LFM 60LFM Nat Conv Airflow PT6729, Vo =1.2V 0 2 4 6 8 10 12 14 Iout (A ) Ambient Temperature (°C) 200LFM 120LFM 60LFM Nat Conv Airflow 0 2 4 6 8 10 12 14 Iout (A ) Ambient Temperature (°C) 200LFM 120LFM 60LFM Nat Conv Airflow 0 2 4 6 8 10 12 14 Iout (A ) Ambient Temperature (°C) 200LFM 120LFM 60LFM Nat Conv Airflow 100 02468 1 0 1 2 1 4 Iout (A ) Efficiency - % 5.0V 3.3V 2.5V 1.8V 1.5V 1.2V VOUT 0 2 4 6 8 10 12 14 Iout (A ) Ripple - mV 5.0V 3.3V 2.5V 1.8V 1.5V 1.2V VOUT 02468 1 0 1 2 1 4 Iout (A ) Pd - Watts 5.0V 3.3V 2.5V 1.8V 1.5V 1.2V VOUT

For technical support and more information, see inside back cover or visit www.ti.com PT6721/22 & PT6725 Series Capacitor Recommendations for the 12V-Input PT6721/22 and PT6725 Series of ISRs Input Capacitors The recommended input capacitor(s) is determined by 1.6Arms minimum ripple current rating and 1,000µF mini- mum capacitance. Ripple current and Equivalent Series Resistance (ESR) values are the major considerations along with temperature when selecting the proper capacitor. The tantalum capacitors listed below cannot be used on the input bus since they are not rated for 12V operation. Output Capacitors The minimum required output capacitance is 330µF with a maximum ESR less than or equal to 50m Ω . 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 nec- essary 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 Table 1 below. /rodneVroticapaC seireS scitsiretcarahCroticapaCy titnauQ gnikroW egatloV )Fµ(eulaVt nelaviuqE)RSE( ecnatsiseRseireS mumixaMC°501 elppiR )smrI(tnerruC lacisyhP )mm(eziS tupnI suB tuptuO suB rebmuNtraProdneV cinosanaP )laidaR(CF )tnuoMecafruS(KF/CF V53 V52 V52 V05 V52 V53 086 0001 0001 0001 0001 074 340.0 Ω 830.0 Ω 830.0 Ω 3700 Ω 830.0 Ω 340.0 Ω Am5561 Am5561 Am0961 Am0161 Am0002 Am0961 5.21 × 02 5.21 × 02 61 × 51 61 × 5.61 81 × 5.61 61 × 5.61 186V1CFUEE 201E1CFUEE S201E1CFUEE M201H1KFVEE N201E1CFVEE N174V1CFVEE noc-imehCdetinU seireSVXL V53 V53 V61 086 0001 074 430.0 Ω 830.0 Ω 480.0 ÷Ω 240.0=2 Ω Am0961 Am0361 (Am528 × )2 5.21 × 52 61 × 02 01 × 61 LL52X21M086BV53VXL LL02X61M201BV53VXL LL61X01M174BV61VXL nocihciN seireSLP seireSMP V53 V52 V53 086 0021 0001 630.0 Ω 930.0 Ω 430.0 Ω Am0661 Am0061 Am0771 5.21 × 52 81 × 51 61 × 02 HHM186V1LPU 6HHM221E1LPU 6HHM201V1MPU :noc-sO SS )tnuoMecafrus(VS V01 V01 033 033 520.0 Ω 020.0 Ω Am0053 Am0083 01 × 5.01 3.01 × 3.01 )1(R/N )1(R/N V(M033SS01 o )V5< V(033VS01 o )V5< mulatnaTXVA )tnuoMecafruS(SPT V01 V01 033 033 1.0 ÷Ω 50.0=2 Ω 60.0 ÷Ω 30.0=2 Ω Am0052> Am0003> L3.7 × W7.5 × H1.4 )1(R/N )1(R/N 0010R010M733ESPT 0600R010M733VSPT mulatnaTtemeK seireS594T/015T (t nuoMecafruS) V01 V01 033 022 330.0 Ω 70.0 ÷Ω 530.0=2 Ω Am0041 Am0002> W3.4 × L3.7 × H0.4 )1(R/N )1(R/N SA010M733X015 SA0010M722X594T mulatnaTeugarpS seireSD495 (t nuoMecafruS) V010 335 40.0 Ω Am0632L 2.7 × W6 × H1.4 )1(R/N1 T 2R0100X733D495 Note: (N/R -Not recommended) The 10V-rated tantalum capacitors cannot be used on the input bus. Table 1 Capacitors Characteristic Data Tantalum Characteristics Tantalum capacitors are recommended on the output bus but only AVX TPS Series, Sprague 593D/594/595 Series, or Kemet T495/T510 Series. These capacitors are recom- mended over other types due to their higher surge current, excellent power dissipation and ripple current ratings. As a caution, 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 also less reliable compared to the TPS series when determining power dissipation capability. Capacitor Table Table 1 identifies the characteristics of capacitors from a number of vendors with acceptable ESR and ripple cur- rent (rms) ratings. The suggested minimum quantities per regulator for both the input and output buses are identified. 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 (Equivalent Series Resistance at 100kHz) are the critical parameters are necessary to insure both optimum regulator performance and long capacitor life.

For technical support and more information, see inside back cover or visit www.ti.com Application Notes Using the Standby Function of the PT6725 Series of Integrated Switching Regulators The PT6725 series of power modules are high efficiency regulators that operate off a +12V input bus voltage. These regulators incorporate an on/off ‘ Standby’ func- tion, which may be used to disable the regulator output. The standby function is provided by the STBY* control, pin 2. If pin 2 is left open-circuit the regulator operates normally, and provides a regulated output when a valid supply voltage is applied to V in (pins 4–6) with respect to GND (pins 8–12). If a low voltage 3 is then applied to pin 2 the regulator output will be disabled and the input current drawn by the ISR will be reduced to 0.5mA The standby control may also be used to hold-off the regulator output during the period that input power is applied. Pin 2 is ideally controlled with an open-collector (or open-drain) discrete transistor (See Figure 1). The open- circuit voltage is typcially the input voltage V in. Table 1 gives the circuit parameters for this control input. Table 1 Standby Control Requirements (2, 3) Parameter Min Typ Max Input Low (VIL) –0.1V +0.4V Istby (pin 2 =ground) — –0.5mA — Vstby (open circuit) — V in — Notes: 1. When the regulator output is disabled the current drawn from the +Vin input source is typically reduced to 0.5mA.

2 The standby control input requires no external pull-up

resistor. The open-circuit voltage of the STBY* pin is approximately th input voltage V in (+12V). 3. The standby control input is Not compatible with TTL devices that incorporate a totem-pole output drive. Use only a true open-collector device, preferably a discrete bipolar transistor (or MOSFET). To ensure the regulator output is disabled, the control pin must be pulled to less than 0.4Vdc with a low-level 0.5mA sink to ground. 4. After Q 1 in Figure 1 is turned off and before the output begins to rise, the regulator output will assert a low impedance to ground. If an external voltage is applied to the output it will sink current and possibly over-stress the part. Figure 1 Turn-On Time: In the circuit of Figure 1, turning Q 1 on applies a low voltage to the STBY control (pin 2) and disables the regulator ouput. Correspondingly, turning Q 1 off removes the low-voltage signal and enables the output. Once enabled, the output will typically experience a 10–15ms delay followed by a predictable ramp-up of voltage. The regulator should provide a fully regulated output voltage within 30ms. Figure 2 shows the output voltage response, V o, of a PT6726 (2.5V) following the turn-off of Q 1. The turn-off of Q 1 corresponds to the rise in V stby. The waveform was measured with a 12Vdc input voltage, and 9.3ADC resistive load. Figure 2 PT6725 Sense(+) Sense(–) V OUT GND Vo(adj) V IN STBY* 13–16 718–12 4–6 C OUT C IN STBY +V in GND GND Vout BSS138 PT6725 Series Vo (1V/Div) Vstby (10V/Div) HORIZ SCALE: 5ms/Div

For technical support and more information, see inside back cover or visit www.ti.com PT6725 Series Adjusting the Output Voltage of the PT6725 Series of Integrated Switching Regulators The PT6725 series of ISRs are non-programmable versions of the PT6721/2 Excalibur™ regulators. The regulators have a fixed output voltage, which may be adjusted higher or lower than the factory pre-set voltage using a single external resistor. Table 1 gives the adjust- ment range for each model in the series as V a (min) and Va (max). Adjust Up: An increase in the output voltage is obtained by adding a resistor R2, between pin 1 (Vo Adjust) and pin 7 (Remote Sense GND). Adjust Down: Add a resistor (R1), between pin 1 (Vo Adjust) and pin 17 (Remote Sense Vout). Refer to Figure 1 and Table 2 for both the placement and value of the required resistor, either (R1) or R2 as appropriate. The values of (R1) [adjust down], and R 2 [adjust up], can also be calculated using the following formulas. Ro ( Va –Vr )(R1) = Vo – Va – Rs kΩ Ro ·Vr – Rs kΩR2 = Va – Vo Where: Vo = Original output voltage Va = Adjusted output voltage Vr = The reference voltage (Table 1) Ro = The multiplier resistance (Table 1) Rs = The internal s eries resistance (Table 1) Figure 1 Notes: 1. Use only a single 1% resistor in either the (R1) or R2 location. Place the resistor as close to the regulator as possible. 2. Never connect capacitors from Vo Adjust to either GND, Vout, or the Remote Sense pins. Adding capacitance to the Vo Adjust pin will affect the stability of the ISR. 3. If the Remote Sense feature is not being used, pin 7 must be connected to pin 8 for optimum output voltage accuracy. The resistors (R 1) and R2 may then be connected from ‘Vo Adjust’ to either Vout or GND respectively. L O A D (R1) Adj Down Adjust Up C out C in COM +5V Vo COM PT6725 Sns(+) Sns(-) Vout GND Vo(adj) Vin Stby* 13–16 718–12 4,5,6

For technical support and more information, see inside back cover or visit www.ti.com Application Notes continued PT6705/PT6715 Series Series Pt # PT6729 PT6728 PT6727 PT6726 Vo (nom) 1.2V 1.5V 1.8V 2.5V Va (req’d) 1.1 (5.1)kΩ 1.15 (45.1)kΩ 1.2 1.25 135.0k Ω 1.3 55.1k Ω 1.35 28.4k Ω 1.4 15.1k Ω 1.45 7.1k Ω 1.474.7 k Ω (18.1)kΩ 1.5 1.8k Ω 1.55 209.0k Ω 1.6 79.6k Ω 1.65 36.5k Ω 1.714.9k Ω 1.75 (46.1)kΩ 1.8 1.85 204.0k Ω 1.9 77.1k Ω 1.95 34.8k Ω 2.0 13.6k Ω 2.05 2.1 2.15 2.2 2.25 (6.0)kΩ 2.3 (18.3)kΩ 2.35 (38.8)kΩ 2.4 (79.8)kΩ 2.45 (203.0)kΩ 2.5 2.55 221.0k Ω 2.6 93.8k Ω 2.65 51.5k Ω 2.730.3k Ω 2.75 17.6k Ω 2.8 9.1k Ω 2.85 3.1k R1 = (Blue) R2 = Black Table 1 ADJUSTMENT AND FORMULA PARAMETERS Series Pt # PT6729 PT6728 PT6727 PT6726 PT6725 PT6724 Table 2 ADJUSTMENT RESISTOR VALUES Series Pt # PT6725 PT6724 Vo (nom) 3.3V 5.0 Va (req’d) 2.75 (2.0)kΩ 2.8 (5.7)kΩ 2.85 (10.2)kΩ 2.9 (15.9)kΩ 2.95 (23.1)kΩ 3.0 (32.8)kΩ 3.05 (46.3)kΩ 3.1 (66.6)kΩ 3.15 (100.0)kΩ 3.2 (168.0)kΩ 3.25 (371.0)kΩ 3.3 3.35 229.0k Ω 3.4 102.0k Ω 3.45 59.8k Ω 3.5 38.6k Ω 3.55 25.9k Ω 3.6 17.4k Ω 3.65 11.4k Ω 3.76.9k Ω 3.75 3.3k Ω 4.1 (3.7)kΩ 4.2 (8.4)kΩ 4.3 (14.4)kΩ 4.4 (22.5)kΩ 4.5 (33.8)kΩ 4.6 (50.8)kΩ 4.7 (79.0)kΩ 4.8 (136.0)kΩ 4.9 (305.0)kΩ 5.0 5.1 90.5k Ω 5.2 32.8k Ω 5.3 13.6k Ω 5.4 4.0k Ω

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