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| PT6670 Series 5V/3.3V Input 20W Boost Integrated Switching Regulator SLTS039A (Revised 6/30/2000) * Input Voltage Range: 3.1 to 3.6V 4.5 to 5.5V * Adjustable Output Voltage * 85% Efficiency * Remote Sense Capability * Soft Start The PT6670 is a series of high-output Integrated Switching Regulators (ISRs) designed to provide a voltage boost function. Housed in a 14-Pin SIP (Single In-line Package), the PT6670 series incorporates regulators for either a +3.3V or +5.0V input and provide output voltages from +5V to +12V. Applications include power for auxilliary circuits requiring up to 20W. Pin-Out Information Pin 1 2 3 4 5 6 7 Ordering Information Pin 8 9 10 11 12 13 14 Function Remote Sense Do not connect Do not connect Function GND GND GND Vout Vout Vout Vout Adjust +3.3V Input PT6671 PT6672 PT6673 +5V Input -- PT6675 PT6674 Vout +5.0 Volts +9.0 Volts +12.0 Volts Standard Application VOAdjust 14 1 REMOTE SENSE Vin Vin Vin GND V IN 4,5,6 PT6670 7,8,9,10 11,12,13 VOUT PT Series Suffix (PT1234X) Case/Pin Configuration Heat Spreader C1 GND + C2 + LOAD GND Pkg Style 400 PT6670 Note: Back surface is conducting metal. C1 = Required 560F electrolytic C2 = Required 560F electrolytic (1) (1) Vertical Through-Hole Horizontal Through-Hole Horizontal Surface Mount P D E Preliminary Specifications Characteristics (Ta = 25C unless noted) Output Current PT6670 SERIES Symbols Io Conditions Ta = 60C, 200 LFM, pkg P Ta = 25C, natural convection PT6671 PT6672 PT6673 PT6674 PT6675 PT6671/2/3 PT6674/5 Min 0.1 0.1 0.1 0.1 0.1 0.1 3.1 4.5 -- -- PT6671 PT6672/5 PT6673/4 3.8 8.2 9.6 -- -- -- -- -- PT6671 PT6672 PT6673 PT6675 PT6674 PT6671 PT6672 PT6673 PT6675 PT6674 -- -- -- -- -- -- -- -- -- -- Typ -- -- -- -- -- -- 3.3 5.0 -- 1.5 -- -- -- 0.25 0.25 3 500 5 85 84 83 88 87 82 80 82 87 86 Max TBD 4.0 1.67 1.25 2.0 3.0 3.6 5.5 TBD -- 5.5 9.2 12.8 0.5 0.5 -- -- -- -- -- -- -- -- -- -- -- -- -- Units A Input Voltage Range Inrush Current Output Voltage T olerance Output Voltage Adjust Range Vin Iir Vo Voadj Regline Regload Vn ttr Vos Over V o and Io range On start-up Vin =V in(TYP) , Io = Iomax Ta = 0C to 65C Pin 14 to Vo or ground Over Vin range, I o = Iomax Vin =V in(TYP), 0.1 Io I omax Vin =V in(TYP) , Io = Iomax Io step between 1/2Iomax and Iomax Vo over/undershoot Vin = V in(TYP), I o = 1/2I omax V A %Vo V %Vo %Vo %Vo Sec %Vo % Line Regulation Load Regulation Vo Ripple/Noise Transient Response with C1 = C2= 560F Efficiency Vin =V in(TYP) , Io = Iomax % (Continued) For technical support and more information, see inside back cover or visit www.ti.com/powertrends PT6670 Series 5V/3.3V Input 20W Boost Integrated Switching Regulator Preliminary Specifications (continued) Characteristics (Ta = 25C unless noted) Switching Frequency Absolute Maximum Operating T emperature Range Recommended Operating T emperature Range Storage T emperature Mechanical Shock Mechanical Vibration Weight PT6670 SERIES Symbols o Ta Ta Ts -- -- -- Free Air Convection (40-60 LFM) Over V in and Io ranges with heat tab -- Per Mil-STD-883D, Method 2002.3 Per Mil-STD-883D, Method 2007.2, 20-2000 Hz, soldered in a PC board -- Conditions Over Vin range 0.1A Io Iomax Min -- -40 -40 -40 -- -- -- Typ 300 -- -- -- 500 7.5 14 Max -- +85 +65 +125 -- -- -- Units kHz C C C G's G's grams Notes: (1) The PT6670 Series requires two 560F electrolytic capacitors (input and output) for proper operation in all applications. (2) This product does not include short circuit protection. TYPICAL PT6671/2/3 (@ Vin=+3.3V) Efficiency vs Output Current 90 85 CHARACTERISTICS PT6674/5 Series (@ Vin=+5.0V) Efficiency vs Output Current 100 (See Note A) (See Note A) 90 80 Efficiency - % 75 70 65 60 Efficiency - % PT6671 PT6672 PT6673 80 PT6675 PT6674 70 60 55 50 0 0.5 1 1.5 2 2.5 3 3.5 4 50 0 0.5 1 1.5 2 2.5 3 Iout (A) Iout (A) Ripple vs Output Current 180 160 140 120 200 250 Ripple vs Output Current Ripple - mV Ripple - mV 100 80 60 40 20 0 0 0.5 1 1.5 2 2.5 3 3.5 4 PT6673 PT6672 PT6671 150 PT6674 PT6675 100 50 0 0 0.5 1 1.5 2 2.5 3 Iout (A) Iout (A) Power Dissipation vs Output Current 5 4.5 4 3.5 4 5 Power Dissipation vs Output Current Pd - Watts 3 2.5 2 1.5 1 0.5 0 0 0.5 1 1.5 2 2.5 3 3.5 4 Pd - Watts PT6673 PT6672 PT6671 3 PT6674 PT6675 2 1 0 0 0.5 1 1.5 2 2.5 3 Iout (A) Iout (A) Note A: All characteristic data in the above graphs has been developed from actual products tested at 25C. This data is considered typical data for the ISR. For technical support and more information, see inside back cover or visit www.ti.com/powertrends Application Notes PT6670 Series Adjusting the Output Voltage of the PT6670 Series Boost Voltage ISR The Power Trends PT6670 ISRs are a series of converters that operate from a 3.3V or 5V input bus voltage. In each case, the output voltage can be adjusted higher or lower than the factory trimmed pre-set voltage. Adjustment requires the addition of a single external resistor. Table 1 gives the permissible adjustment range for each model in the series as Va(min) and Va(max) respectively. Adjust Up: T increase the output, add a resistor o R2 between pin 14 (Vo Adjust) and pins 7-10 (GND). Adjust Down: Add a resistor (R1), between pin 14 (Vo Adjust) and pin 1 (Remote Sense). Refer to Figure 1 and T able 2 for both the placement and value of the required resistor. Notes: 1. Use only a single 1% resistor in either the (R1) or R2 location. Place the resistor as close to the ISR as possible. 2. Do not exceed the maximum advised adjustment voltage. Doing so could over stress the part. 3. Never connect capacitors to the Vo Adjust control pin. Any capacitance added to this pin will affect the stability of the ISR. 4. In the case of the PT6671, when the output is adjusted lower than the pre-trimmed output, the maximum input voltage to the ISR should not exceed (V0 - 0.5)V. The adjust up and adjust down resistor values can also be calculated using the following formulas. Be sure to select the correct formula parameters from Table 1 for the model being adjusted. (R1) = Ko (Va - 2.5) 2.5 (Vo - Va) - Rs k Figure 1 1 Vsense 4,5,6 11,12,13 Vin Vin PT6670 GND 7,8,9,10 Vo Vo Vo(adj) 14 (R1) Adj Down + + C in R2 Adjust Up COM C out L O A D COM Table 1 PT6670 ADJUSTMENT RANGE AND FORMULA PARAMETERS Series Pt # 3.3V Bus 5.0V Bus Vo(nom) Va(min) Va(max) Ko (V*k) Rs (k) PT6671 5.0V 3.8V 5.5V 25.0 4.99 PT6672 PT6675 9.0V 8.2V 9.2V 48.75 80.6 PT6673 PT6674 12.0V 9.6V 12.8V 47.41 54.9 Table 2 PT6670 ADJUSTMENT RESISTOR VALUES Series Pt # 3.3V Bus 5.0V Bus Vo(nom) Va(req'd) 3.8 3.9 4.0 4.1 4.2 4.3 4.4 PT6671 5.0V Va(req'd) (5.8)k (7.7)k (10.0k (12.8)k (16.3)k (20.7)k (26.7)k (35.0)k (47.5)k (68.3)k (110.0)k (235.0)k 245.0k 120.0k 78.3k 57.5k 45.0k 8.2 8.4 8.6 8.8 9.0 9.2 9.4 9.6 9.8 10.0 10.2 10.4 10.6 10.8 11.0 11.2 11.4 11.6 11.8 12.0 12.2 12.4 12.6 12.8 R1 = (Blue) R2 = Black 182.0k 63.3k 24.1k 4.4k (1.2)k (8.0)k (16.2)k (26.2)k (38.7)k (54.8)k (76.3)k (106.0)k (151.0)k (226.0)k (376.0)k (827.0)k 163.0k (58.3)k (111.0)k (217.0)k (534.0)k PT6672 PT6675 9.0V PT6673 PT6674 12.0V R2 = Ko Va - Vo - Rs k 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 Where: Vo Va Ko Rs = Original output voltage = Adjusted output voltage = The multiplier constant in T able 1 = The series resistance from T able 1 For technical support and more information, see inside back cover or visit www.ti.com/powertrends IM PORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, eitherexpress orimplied, is granted underany patent right, copyright, mask work right, orother intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof. Copyright (c) 2000, Texas Instruments Incorporated |
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