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| PT6935 Series 11 Amp 5V/3.3V Input Dual Output Integrated Switching Regulator SLTS091 Revised (7/31/2000) Features * Dual Outputs (See Ordering Information) * 5.0V Input (3.3V for PT6935) * * * * * * * * Patent pending on package assembly Both Outputs Adjustable Remote Sense Standby Function Soft-Start Internal Sequencing Short Circuit Protection 23-pin Space-Saving Package Solderable Copper Case The PT6935/6/7 is a series of dual output ISRs designed to power the latest generation of mixed signal ICs. Both output voltages are independently adjustable with external resistors, and may also be set to at least one alternative bus voltage with a simple pin-strap. The PT6935 series has internal power sequencing to accommodate the requirements of the latest DSP chips, such as TI's `C6000 series. Pin-Out Information Standard Application C1 = Req'd 560F electrolytic (1) C2 = Req'd 330F electrolytic (1) C3 = Optional 100F electrolytic Ordering Information Function V 1out V 1out V 1out V 1 Adjust* Do Not Connect Pin Function 1 2 3 V2 Sense Pin 13 14 15 16 17 18 19 20 21 22 23 V1 Remote Sense Do Not Connect PT6935t = +2.5/1.8 Volts t PT6936t = +3.3/2.5 Volts t PT6937t = +3.3/1.8 Volts t STBY Vin Vin Vin GND GND GND GND GND V1out 4 5 6 7 8 9 10 GND PT Series Suffix (PT1234X) N A C (For dimensions and PC board layout, see Package Styles 1320 and 1330.) Case/Pin Configuration Vertical Through-Hole Horizontal Through-Hole Horizontal Surface Mount STBY 3 22 1 18-21 V1 Sense V2OUT V1OUT R1 R3 V 2out V 2out V 2out V 2out V 2 Remote Sense V 2 Adjust* VIN 4,5,6 PT6935 7-11 16 23 12-15 C1 C2 R4 R2 + C3 + GND 11 12 *Note: V1out and V2out can be pin-strapped to another voltage. See related application note on output voltage adjustment. Preliminary Specifications Characteristics (Ta= 25C unless noted) Output Current PT6935 SERIES Symbols Io Conditions Ta = +60C, 200 LFM, pkg N; Vin =5.0V V1 = 3.3V V2 = 2.5V V1 =3.3V V2 =1.8V V1 =2.5V V2 =1.8V Ta = +25C, natural convection V1 = 3.3V V2 =2.5V V1 =3.3V V2 =1.8V V1 = 2.5V V2 = 1.8V Min 0.1 0 0.1 0 0.1 0 0.1 0 0.1 0 0.1 0 3.1 4.5 Vo-0.03 V1 = 3.3V V2 = 2.5V V1 =2.5V V2 =1.8V -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- (2) (2) (2) (2) (2) (2) Typ 8.0 3.0 8.0 2.0 7.0 2.5 8.0 3.0 8.0 2.0 7.0 2.5 -- -- -- 5 2 5 2 5 5 5 5 35 35 35 35 60 60 60 (3) (3) (3) (3) (3) (3) (3) (3) (3) (3) (3) (3) Max 13.0 5.0 13.0 2.8 10.0 6.0 13.0 5.0 13.0 3.0 12.0 6.0 22.5 5.5 5.5 Vo+0.03 10 5 10 5 10 10 10 10 -- -- -- -- -- -- -- (4) (4) (4) (4) (4) (4) (4) (4) (4) (4) (4) (4) Units A A A A A A A V V mV mV mV mV mV mV Sec mV (Continued) Short Circuit Current Threshold Input Voltage Range Output Voltage Tolerance Line Regulation I sc Vin Vo Regline Vin =5V, I 1+I 2 combined 0.1A Io I max PT6935 PT6936/PT6937 12.0 Vin = +5V, I o =ITYP, both outputs -40C Ta +85C Over specifiedVin range, Io =I TYP Load Regulation Regload Vin = +5V, 0.1 I o I TYP V1 = 3.3V V2 = 2.5V V1 =2.5V V2 =1.8V Vo Ripple/Noise Vn Vin = +5V, Io =I TYP V1 = 3.3V V2 = 2.5V V1 =2.5V V2 =1.8V Transient Response with C2 = 330F ttr Vos Io step between 0.5xI TYP and I TYP Vo over/undershoot V1 = 3.3V V2 = 2.5V For technical support and more information, see inside back cover or visit www.ti.com/powertrends PT6935 Series 11 Amp 5V/3.3V Input Dual Output Integrated Switching Regulator Specifications (From previous page) Characteristics (Ta= 25C unless noted) Switching Frequency Absolute Maximum Operating Temperature Range Storage Temperature Weight PT6935 SERIES Symbols o Ta Ts -- -- Vertical/Horizontal Conditions 3.1V V in 5.5V 0.1A Io I TYP -- Min 300 -40 -40 -- (5) Typ 350 -- -- 29 Max 400 +85 (6) +125 -- Units kHz C C grams Notes: (1) (2) (3) (4) The PT6935 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 between both output, V1 or V2. The ISR will operate down to no-load with reduced specifications. The typical current is the load that can be simulataneously drawn from both outputs under the stated operating conditions. The maximum specified current is that which can be drawn from the applicable output with the other output unloaded. The total current on both outputs must never exceed the maximum load current specified for V1out. If either output voltage is adjusted, consult the factory for guidance. (5) For operating temperatures below 0, Cin and Cout must have stable characteristics. Use either tantalum or Oscon(R) capacitors. (6) See Safe Operating Area curves, or contact the factory for the appropriate derating. TYPICAL Performance, VIN =5V -Unless specified, Efficiency Vs I1out, (VIN =3.3V for PT6935) 90 85 80 CHARACTERISTICS Safe Operating Area @VIN=5.0V PT6935; I2out =2.5A Fixed 90.0 80.0 (See Note A) (See Note B) Ambient Temperature (C) 70.0 60.0 50.0 40.0 30.0 20.0 Airflow 200LFM 120LFM 60LFM Nat conv Efficiency - % 75 70 65 60 55 50 0 1 2 3 4 5 6 7 8 PT6935 PT6936 PT6937 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 I 1 out (A) [ I2 fixed at I2 TYP ] I1 out (A) V1out Ripple Vs I 1out 80 70 60 90.0 80.0 PT6936; I2out =3.0A Fixed Ambient Temperature (C) 70.0 60.0 50.0 40.0 30.0 20.0 Airflow 200LFM 120LFM 60LFM Nat conv Ripple - mV 50 40 30 20 10 0 0 1 2 3 4 5 6 7 8 PT6935 PT6936 PT6937 0.0 2.0 4.0 6.0 8.0 I1 out (A) [ I2 fixed at I2 TYP ] I1 out (A) Power Dissipation Vs I1out 9 8 7 6 90.0 80.0 PT6937; I2out =2.0A Fixed Ambient Temperature (C) 70.0 60.0 50.0 40.0 30.0 20.0 Airflow 200LFM 120LFM 60LFM Nat conv Pd - Watts 5 4 3 2 1 0 0 1 2 3 4 5 6 7 8 PT6935 PT6936 PT6937 0.0 2.0 4.0 6.0 8.0 I1 out (A) [ I2 fixed at I2 TYP ] I1 out (A) Note A: Performance graphs have 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 the manufacturer's maximum operating conditions For technical support and more information, see inside back cover or visit www.ti.com/powertrends Application Notes PT6935, PT6936, PT6937 Adjusting the Output Voltage of the PT6935 Dual Output Voltage ISRs Each output voltage from the PT6935 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 1. Table 1 gives the adjustment range for both V1 and V2 for each model in the series as Va(min) and V a(max). Note that V2 must always be lower than V1 2. V1 Adjust Up: To increase the output, add a resistor R4 between pin 16 (V1 Adjust) and pins 7-11 (GND) 1. V1 Adjust Down: Add a resistor (R3), between pin 16 (V1 Adjust) and pin 1 (V1 Remote Sense) 1. V2 Adjust Up: Add a resistor R2 between pin 23 (V2 Adjust) and pins 7-11 (GND) 1. V2 Adjust Down: Add a resistor (R1) between pin 23 (V2 Adjust) and pin 22 (V2 Remote Sense) 1. Refer to Figure 1 and Table 2 for both the placement and value of the required resistor. Notes: 1. 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. 2. V2 must always be at least 0.2V lower than V1. 3. Both the V1 and V2 may be adjusted down to an alternative bus voltage by making, (R3) or (R1) respectively, a zero ohm link. Refer to the Table 1 footnotes for guidance. 4. Adjusting the V1out output voltage of the PT6935 (2.5V/1.8V model) higher than the factory pretrimmed output voltage may increase the minimum input voltage specified for the part. This model must comply with the following requirements. PT6935: Vin(min) =(Va + 0.6)V or 3.1V, whichever is greater. 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 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 Table 1 for the output and model being adjusted. (R1) or (R3) = 10 (Va - Vr ) - Rs Vo - Va 10 * Vr V a - Vo - Rs k (R2) or (R4) = Where: Vo Va Vr Rs = = = = k Original output voltage, (V1 or V2) Adjusted output voltage The reference voltage from Table 1 The series resistance from Table 1 Table 1 PT6920 ADJUSTMENT RANGE AND FORMULA PARAMETERS Output Bus Series Pt # Adj. Resistor Vo(nom) Va(min) Va(max) Vr Rs (k ) V1 out PT6935 (R3)/R4 2.5V 1.8V * 3.6V (4) 1.27V 7.5 PT6936/37 (R3)/R4 3.3V 2.5V * 3.6V 1.27V 15.4 V2 out (2) PT6935/37 PT6936 (R1)/R2 (R1)/R2 1.8V 1.5V 2.4V 1.0V 16.9 2.5V 1.8V 3.0 1.0V 11.5 * (R3) =Zero-ohm link (3) (R1) =Zero-ohm link (3) Figure 1 22 V 2 (sns) 4,5,6 Vin 1 V 1 (sns) V2 out 18 - 21 V 2 out V 1 out (R1) + + L O A D L O A D Vin PT6935 V1 out 12 - 15 GND 7 - 11 Vo 2 (adj) 23 Vo 1 (adj) 16 STBY 3 + (R3) Adj Down C1 R4 Adjust Up COM A d j u s t V 1out R2 C2 C3 COM A d j u s t V 2out For technical support and more information, see inside back cover or visit www.ti.com/powertrends Application Notes continued PT6935, PT6936, PT6937 Table 2 PT6935 ADJUSTMENT RESISTOR VALUES Output Bus Series Pt # Adj. Resistor V o(nom) V a(req'd) 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 3.6 247.0k 120.0k 77.2k 56.0k 43.3k 34.8k 28.8k 24.3k 20.7k 17.9k 15.6k 13.7k 12.0k 10.6k 9.4k 8.4k 6.6k 5.2k 4.1k 112.0k 48.1k 26.9k R2/R4 = Black (0.0)k (1.4)k (3.0)k (4.9)k (7.1)k (9.8)k (13.3)k (17.6)k (23.5)k (31.7)k (44.0)k (64.5)k (106.0)k (229.0)k (0.0)k (1.7)k (3.6)k (5.8)k (8.4)k (11.5)k (15.2)k (19.7)k (25.4)k (32.6)k (42.3)k (55.8)k (76.1)k (110.0)k (178.0)k (381.0)k 189.0k 88.5k 55.2k 38.5k 28.5k 21.8k 17.1k 13.5k 10.7k 8.5k 183.0k 83.1k 49.8k 33.1k 23.1k 16.4k 11.7k 8.1k 5.3k 3.1k 1.3k 0.0k (0.0)k (5.1)k (13.1)k (26.4)k (53.1)k (133.0)k (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 PT6935 (R3)/R4 2.5V V1 out PT6936/37 (R3)/R4 3.3V V2 out PT6935/37 PT6936 (R1)/R2 (R1)/R2 1.8V 2.5V R1/R3 = (Blue) For technical support and more information, see inside back cover or visit www.ti.com/powertrends |
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