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| PT6920 Series 25 Watt 5V Input Dual Output Integrated Switching Regulator SLTS042A (Revised 6/30/2000) * Dual Outputs: +3.3V/6A +2.5V/2.2A or +1.8V/1.5A * * * * * * * Adjustable Output Voltage Remote Sense (both outputs) Standby Function Over-T emperature Protection Soft-Start Internal Sequencing 23-pin SIPPackage The PT6920 is a series of 25W dual output ISRs that were purposely designed to power the latest generation DSP chips. Both output voltages are independently adjustable, allowing either output voltages to be changed to accomodate a DSP upgrade. The internal power sequencing of both outputs meet the requirements of TI's `C6000 series DSPs. Patent Pending* Pin-Out Information Standard Application C 1 = Req'd 560F electrolytic (1) C 2 = Req'd 330F electrolytic (1) C 3 = Optional 100F electrolytic Ordering Information Pin 13 14 15 16 17 18 19 20 21 22 23 Pin Function 1 V2 Sense V1 Sense Function V 1out V 1out V 1out V 1 Adjust Do Not Connect V1 Remote Sense Do Not Connect 2 3 4 5 6 7 8 9 GND STBY Vin Vin Vin GND GND GND GND GND V1out PT6921J = +3.3 Volts J +2.5/+1.8 Volts PT6922J = +3.3 Volts J +1.5 Volts STBY 3 22 1 18-21 V2OUT V1OUT R1 VIN 4,5,6 PT6920 7-11 16 23 V 2out V 2out V 2out V 2out V 2 Remote Sense V 2 Adjust* PT Series Suffix (PT1234X) Case/Pin Configuration Vertical Through-Hole N Horizontal Through-Hole A Horizontal Surface Mount C 12-15 R3 C1 C2 R4 R2 + C3 + GND 10 11 12 Note: for PT6921 only: with pin 23 open, V2out=2.5V with pin 23 shorted to pin 22, V2out=1.8V (For dimensions and PC board layout, see Package Styles 1100 and 1110.) Specifications Characteristics (Ta= 25C unless noted) Output Current PT6920 SERIES Symbols Io Conditions Ta = +60C, 200 LFM, pkg N V1 = 3.3V V2 = 2.5V V2 = 1.8V V2 = 1.2V Min 0.1 0 0 0 0.1 0 0 0 4.5 Vo-0.1 -- -- -- -- -- -- -- -- -- -- 475 -40 -40 -- (4) (2) Typ -- -- -- -- -- -- -- -- -- -- 7 7 17 4 50 25 25 60 60 75 600 -- -- 29 Max 5.5 (3) 2.2 (3) 1.75(3) 1.2 (3) 6.0 2.2 1.75 1.2 5.5 Vo+0.1 17 13 33 10 -- -- -- -- -- -- 725 +85 (5) +125 -- Units A Ta = +25C, natural convection V1 = 3.3V V2 = 2.5V V2 = 1.8V V2 = 1.2V Input Voltage Range Output Voltage T olerance Line Regulation Load Regulation Vo Ripple/Noise Transient Response with C2 = 330F Efficiency Switching Frequency Absolute Maximum Operating T emperature Range Storage T emperature Weight Vin Vo Regline Regload Vn ttr Vos o Ta Ts -- 0.1A Io I max Vin = +5V, Io = Imax, both outputs 0C Ta +65C 4.5V Vin 5.5V, Io = Imax Vin = +5V, 0.1 Io Imax Vin = +5V, Io = Imax V1 = 3.3V V2 = 2.5V V1 = 3.3V V2 = 2.5V V1 = 3.3V V2 = 2.5V A V V mV mV mV Sec mV % kHz C C grams Io step between 0.5xImax and Imax Vo over/undershoot V1 = 3.3V V2 = 2.5V Vin = +5V, Io = 4A total 4.5V Vin 5.5V 0.1A Io I max Over Vin Range -- Vertical/Horizontal Notes: (1) (2) (3) (4) (5) The PT6920 series requires a 560F electrolytic capacitor on the input and a 330F electrolytic capacitor on the output for proper operation in all applications. Iomin current of 0.1A can be divided btween both outputs; V1, or V2. The ISR will operate down to no-load with reduced specifications. Iomax listed for each output assumes the maximum current drawn simultaneously on both outputs. Consult the factory for the absolute maximum. For operating temperatures below 0C, use tantalum type capacitors on both the input and output. See Safe Operating Area curves for appropriate derating. For technical support and more information, see inside back cover or visit www.ti.com/powertrends PT6920 Series 25 Watt 5V Input Dual Output Integrated Switching Regulator Typical Characteristics PT6921, V2out = 2.5V, I2out = 2.2A Total Efficiency vs I1out 100 90 (See Note A) Vin Efficiency (%) 80 4 .5 V 5 .0 V 70 5 .5 V 60 50 40 0 1 2 3 4 5 6 I1out (A) Total Power Dissipation vs I1out 10 8 Vin PD (Watts) 6 4 .5 V 5 .0 V 5 .5 V 4 2 0 0 1 2 3 4 5 6 I1out (A) V1out Ripple vs I1out 50 40 Vin Ripple (mV) 30 4 .5 V 5 .0 V 5 .5 V 20 10 0 0 1 2 3 4 5 6 I1out (A) Safe Operating Area vs I1out (See Note B) 90 80 70 N at co nv. 6 0 LF M 2 0 0L F M Ta (C) 60 50 40 30 0 1 2 3 4 5 6 I1out (A) Note A: All characteristic 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 operating conditions at which internal components are at or below manufacturer's maximum rated operating conditions. For technical support and more information, see inside back cover or visit www.ti.com/powertrends A pplication Notes PT6920/PT6930 Series Adjusting the Output Voltage of the PT6920 and PT6930 Dual Output Voltage ISRs Each output voltage from the PT6920 and PT6930 series of ISRs can be independantly adjusted higher or lower than the factory trimmed pre-set voltage. V1 (the voltage at V1out), or V2 (the voltage at V2out) may each be adjusted either up or down using a single external resistor 2. T able 1 gives the adjustment range for both V1 and V2 for each model in the series as Va(min) and Va(max). Note that V2 must always be lower than V1 3. V1 Adjust Up: T increase the output, add a resistor o R4 between pin 16 (V1 Adjust) and pins 7-11 (GND) 2. V1 Adjust Down: Add a resistor (R3), between pin 16 (V1 Adjust) and pin 1 (V1 Remote Sense) 2. V2 Adjust Up: Add a resistor R2 between pin 23 (V2 Adjust) and pins 7-11 (GND) 2. V2 Adjust Down: Add a resistor (R1) between pin 23 (V2 Adjust) and pin 22 (V2 Remote Sense) 2. Refer to Figure 1 and T able 2 for both the placement and value of the required resistor. Notes: 1. The output voltages, V1out and V2out, may be adjusted independantly. 2. Use only a single 1% resistor in either the (R3) or R4 location to adjust V1, and in the (R1) or R2 location to adjust V2. Place the resistor as close to the ISR as possible. 3. V2 must always be at least 0.2V lower than V1. 4. V2 on both the PT6921 and PT6931 models may be adjusted from 2.5V to 1.8V by simply connecting pin 22 (V2 Remote Sense) to pin 23 (V2 Adjust). For more details, consult the data sheet. 5. If V1 is increased above 3.3V, the minimum input voltage to the ISR must also be increased. The minimum required input voltage must be (V1 + 1.2)V or 4.5V, whichever is greater. Do not exceed 5.5V 6. Never connect capacitors to either the V1 Adjust or V2 Adjust pins. Any capacitance added to these control pins will affect the stability of the respective regulated output. 7. Adjusting either voltage (V1 or V2) may increase the power dissipation in the regulator, and correspondingly change the maximum current available at either output. Consult the factory for application assistance. The adjust up and adjust down resistor values can also be calculated using the following formulas. Be sure to select the correct formula parameter from T able 1 for the output and model being adjusted. Ro (Va - 1) - Rs k (R1) or (R3) = Vo - Va R2 or R4 Where: = Vo Va Ro Rs Ro Va - Vo - Rs k = Original output voltage, (V1 or V2) = Adjusted output voltage = The resistance value from T able 1 = The series resistance from T able 1 Table 1 PT6920 ADJUSTMENT RANGE AND FORMULA PARAMETERS Output Bus Ser ies Pt # Standar d Case Excalibur Case Adj. Resistor Vo(nom) Va(min) Va(max) Ro (k) Rs (k) V1 out PT6921/22 PT6931/32 (R3)/R4 3.3V 2.3V 3.6V 12.1 12.1 PT6921 PT6931 (R1)/R2 2.5V 1.8V 3.0V 10.0 11.5 V2 out PT6922 PT6932 (R1)/R2 1.5 1.2 3.0 9.76 6.49 Figur e 1 22 V 2 (sns) 4,5,6 Vin 1 V 1 (sns) V 2 out 18 - 21 V 2 out V 1 out (R1) + + L O A D L O A D Vin PT6920 V 1 out 12 - 15 GND 7 - 11 Vo 2 (adj) Vo 1 (adj) 23 16 STBY 3 + (R3) Adj Down C1 R4 Adjust Up COM Adjust V1out R2 C2 C3 COM Adjust V2out For technical suppor t and mor e infor mation, see inside back cover or visit www.ti.com/power tr ends A pplication Notes continued PT6920/PT6930 Series Table 2 PT6920/PT6930 ADJUSTMENT RESISTOR VALUES Output Bus V1 out Ser ies Pt# Standar d Case PT6921/6922 Excalibur Case PT6931/6932 Adj Resistor (R3)/R4 Vo(nom) 3.3Vdc Va(r eq'd) 1.2 1.25 1.3 1.35 1.4 1.45 1.5 1.55 1.6 1.65 1.7 1.75 1.8 1.85 1.9 1.95 2.0 2.05 2.1 2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 3.15 3.2 3.25 3.3 3.4 3.5 109.0k See Note 5 48.4k (3.6)k (5.1)k (6.7)k (8.5)k (10.6)k (12.9)k (15.6)k (18.6)k (22.2)k See Note 3 (26.4)k (31.5)k (37.6)k (45.4)k (55.3)k (68.6)k (87.1)k (115.0)k (161.0)k (254.0)k (532.0)k 189.0k 88.5k 55.2k 38.5k 28.5k 21.8k 17.1k 13.5k 10.7k 8.5k (0.0)k (1.6)k (3.5)k (5.8)k (8.5)k (11.8)k (16.0)k (21.4)k (28.5)k (38.5)k (53.5)k (78.5)k (129.0)k (279.0)k 189.0k 91.1k 58.6k 42.3k 32.6k 26.0k 21.4k 17.9k 15.2k 13.0k 11.3k 9.8k 8.5k 7.5k 6.5k 5.7k 5.0k 4.4k 3.8k 3.3k 2.8k 2.4k 2.0k 1.6k 1.3k 1.0k 0.7k 0.5k 0.2k 0.0k V2 out PT6921 PT6931 (R1)/R2 2.5Vdc PT6922 PT6932 (R1)/R2 1.5Vdc (0.0)k (3.3)k (8.2)k (16.3)k (32.6)k (81.4)k 3.6 28.2k R1/R3 = (Blue) R2/R4 = Black For technical suppor t and mor e infor mation, see inside back cover or visit www.ti.com/power tr ends A pplication Notes PT6920/PT6930 Series Using the Standby Function on the PT6920 and PT6930 Dual Output Voltage Conver ter s Both output voltages of the 23-pin PT6920/6930 dual output converter may be disabled using the regulator's standby function. This function may be used in applications that require power-up/shutdown sequencing, or wherever there is a requirement to control the output voltage On/Off status with external circuitry. The standby function is provided by the STBY* control, pin 3. If pin 3 is left open-circuit the regulator operates normally, and provides a regulated output at both V1out (pins 12-15) and V2out (pins 18-21) whenever a valid supply voltage is applied to Vin (pins 4, 5, & 6) with respect to GND (pins 7-11). If a low voltage2 is then applied to pin-3 both regulator outputs will be simultaneously disabled and the input current drawn by the ISR will typcially drop to less than 30mA (50mA max). The standby control may also be used to hold-off both regulator outputs during the period that input power is applied. The standby pin is ideally controlled using an open-collector (or open-drain) discrete transistor (See Figure 1). It may also be driven directly from a dedicated TTL3 compatible gate. Table 1 provides details of the threshold requirements. Table 1 Inhibit Contr ol Thr esholds 2,3 Par ameter Min Max Enable (VIH) Disable (VIL) 1.8V -0.1V Vin 0.8V Figur e 1 22 V 2 (sns) 4,5,6 Vin 1 V 1 (sns) V 2 out 18 - 21 V 2 out V 1 out V in PT6921 V 1 out 12 - 15 GND 7 - 11 Vo 2 (adj) 23 V 0 1 (adj) 16 STBY + C1 3 + C2 C3 + COM Q1 BSS138 COM Inhibit +5V V in Tur n-On Time: T urning Q1 in Figure 1 off removes the lowvoltage signal at pin 3 and enables both outputs from the PT6920/6930 regulator. Following a delay of about 5-10ms, V1out and V2out rise together until the lower voltage, V2out, reaches its set output. V1out then continues to rise until both outputs reach full regulation voltage. The total power-up time is less than 15ms, and is relatively independant of load, temperature, and output capacitance. Figure 2 shows waveforms of the input current Iin, and output voltages V1out and V2out, for a PT6921 (3.3V/2.5V). The turn-off of Q1 corresponds to t =0 secs. The waveforms were measured with a 5Vdc input voltage, and with resistive loads of 5.5A and 2.2A at the V1out and V2out outputs respectively. Notes: 1. The Standby/Inhibit control logic is similar for all Power Trends' modules, but the flexibility and threshold tolerances will be different. For specific information on this function for other regulator models, consult the applicable application note. 2. The Standby control pin is ideally controlled using an open-collector (or open-drain) discrete transistor and requires no external pull-up resistor. T disable the o regulator output, the control pin must be pulled to less than 0.8Vdc with a low-level 0.5mA sink to ground. 3. The Standby input on the PT6920/6930 series may be driven by a differential output device, making it directly compatible with TTL logic. The control input has an internal pull-up to the input voltage Vin. A voltage of 1.8V or greater ensures that the regulator is enabled. Do not use devices that can drive the Standby control input above 5.5V or Vin. Figur e 2 V1 (2V/Div) V2 (2V/Div) Iin (4A/Div) 0 2 4 6 8 10 12 14 t (milli - secs) For technical suppor t and mor e infor mation, see inside back cover or visit www.ti.com/power tr ends IMPORTA NT NOTICE Texas Instr uments and its subsidiar ies (TI) r eser ve the r ight to make changes to their pr oducts or to discontinue any pr oduct or ser vice without notice, and advise customer s to obtain the latest ver sion of r elevant infor mation to ver ify, befor e placing or der s, that infor mation being r elied on is cur r ent and complete. All pr oducts ar e sold subject to the ter ms and conditions of sale supplied at the time of or der acknowledgment, including those per taining to war r anty, patent infr ingement, and limitation of liability. TI war r ants per for mance of its semiconductor pr oducts to the specifications applicable at the time of sale in accor dance with TI's standar d war r anty. Testing and other quality contr ol techniques ar e utilized to the extent TI deems necessar y to suppor t this war r anty. Specific testing of all par ameter s of each device is not necessar ily per for med, except those mandated by gover nment r equir ements. Customer s ar e r esponsible for their applications using TI components. In or der to minimize r isks associated with the customer 's applications, adequate design and oper ating safeguar ds must be pr ovided by the customer to minimize inher ent or pr ocedur al hazar ds. TI assumes no liability for applications assistance or customer pr oduct design. TI does not war r ant or r epr esent that any license, either expr ess or implied, is gr anted under any patent r ight, copyr ight, mask wor k r ight, or other intellectual pr oper ty r ight of TI cover ing or r elating to any combination, machine, or pr ocess in which such semiconductor pr oducts or ser vices might be or ar e used. TI's publication of infor mation r egar ding any thir d par ty's pr oducts or ser vices does not constitute TI's appr oval, war r anty or endor sement ther eof. Copyr ight (c) 2000, Texas Instr uments Incor por ated |
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