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 Standard Application VOAdjust REMOTE SENSE 14 V IN 4,5,6 C1 1 PT6670 + VOUT 11,12,13 7,8,9,10 C2 + Function 1 2 3 4 5 6 7 Remote Sense Do not connect Do not connect Vin Vin Vin GND Ordering Information Pin 8 9 10 11 12 13 14 Function GND GND GND Vout Vout Vout Vout Adjust +3.3V Input +5V Input PT6671 PT6672 PT6673 — PT6675 PT6674 GND (1) Vout +5.0 Volts +9.0 Volts +12.0 Volts PT Series Suffix (PT1234X) Case/Pin Configuration LOAD GND C1 = Required 560µF electrolytic C2 = Required 560µF electrolytic Pin Vertical Through-Hole Horizontal Through-Hole Horizontal Surface Mount Pkg Style 400 PT6670 Heat Spreader Note: Back surface is conducting metal. P D E (1) Preliminary Specifications PT6670 SERIES Characteristics (Ta = 25°C unless noted) Symbols Output Current Io Conditions Min Typ Max PT6671 PT6672 PT6673 PT6674 PT6675 0.1 0.1 0.1 0.1 0.1 0.1 — — — — — — TBD 4.0 1.67 1.25 2.0 3.0 PT6671/2/3 PT6674/5 3.1 4.5 3.3 5.0 3.6 5.5 V Ta = 60°C, 200 LFM, pkg P Ta = 25°C, natural convection Units A Input Voltage Range Vin Over V o and Io range Inrush Current Iir On start-up — — TBD A Output Voltage Tolerance ∆Vo Vin =V in(TYP) , Io = Iomax Ta = 0°C to 65°C — 1.5 — %Vo Output Voltage Adjust Range Voadj Pin 14 to Vo or ground 3.8 8.2 9.6 — — — 5.5 9.2 12.8 V Line Regulation Regline Over Vin range, I o = Iomax — ±0.25 ±0.5 %Vo Load Regulation Regload Vin =V in(TYP), 0.1 ≤ Io ≤ I omax — ±0.25 ±0.5 %Vo Vo Ripple/Noise Vn Vin =V in(TYP) , Io = Iomax — 3 — %Vo Transient Response with C1 = C2= 560µF ttr Vos Io step between ½Iomax and Iomax Vo over/undershoot — — 500 5 — — µSec %Vo Efficiency η Vin = V in(TYP), I o = ½I omax PT6671 PT6672 PT6673 PT6675 PT6674 — — — — — 85 84 83 88 87 — — — — — % PT6671 PT6672 PT6673 PT6675 PT6674 — — — — — 82 80 82 87 86 — — — — — % Vin =V in(TYP) , Io = Iomax PT6671 PT6672/5 PT6673/4 (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) PT6670 SERIES Characteristics (Ta = 25°C unless noted) Symbols Conditions Min Typ Max Units Switching Frequency ƒo Over Vin range 0.1A ≤ Io ≤ Iomax — 300 — kHz Absolute Maximum Operating Temperature Range Ta -40 — +85 °C Recommended Operating Temperature Range Ta Free Air Convection (40-60 LFM) Over V in and Io ranges with heat tab -40 — +65 °C Storage Temperature Ts — -40 — +125 °C Mechanical Shock — Per Mil-STD-883D, Method 2002.3 — 500 — G’s Mechanical Vibration — Per Mil-STD-883D, Method 2007.2, 20-2000 Hz, soldered in a PC board — 7.5 — G’s Weight — — — 14 — grams Notes: (1) The PT6670 Series requires two 560µF electrolytic capacitors (input and output) for proper operation in all applications. (2) This product does not include short circuit protection. T Y P I C A L PT6671/2/3 (@ Vin=+3.3V) C H A R A C T E R I S T I C S (See Note A) PT6674/5 Series (@ Vin=+5.0V) Efficiency vs Output Current (See Note A) Efficiency vs Output Current 90 100 85 90 75 PT6671 PT6672 PT6673 70 65 Efficiency - % Efficiency - % 80 80 PT6675 PT6674 70 60 60 55 50 50 0 0.5 1 1.5 2 2.5 3 3.5 4 0 0.5 1 Iout (A) 1.5 2 2.5 3 Iout (A) Ripple vs Output Current Ripple vs Output Current 180 250 160 200 140 PT6673 PT6672 PT6671 100 80 Ripple - mV Ripple - mV 120 150 PT6674 PT6675 100 60 40 50 20 0 0 0 0.5 1 1.5 2 2.5 3 3.5 4 0 0.5 1 Iout (A) 1.5 2 2.5 3 Iout (A) Power Dissipation vs Output Current Power Dissipation vs Output Current 5 5 4.5 4 4 3 PT6673 PT6672 PT6671 2.5 2 Pd - Watts Pd - Watts 3.5 3 PT6674 PT6675 2 1.5 1 1 0.5 0 0 0 0.5 1 1.5 2 Iout (A) 2.5 3 3.5 4 0 0.5 1 1.5 2 2.5 3 Iout (A) Note A: All characteristic data in the above graphs has been developed from actual products tested at 25°C. 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. Figure 1 1 Vsense 4,5,6 Vin PT6670 Vin Vo GND 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 (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) R2 Where: = = Vo Va Ko Rs Ko (Va – 2.5) 2.5 (Vo – Va) Ko Va – Vo – Rs – Rs kΩ kΩ = Original output voltage = Adjusted output voltage = The multiplier constant in Table 1 = The series resistance from Table 1 Vo Vo(adj) 7,8,9,10 14 (R1) Adj Down + + C in C out R2 Adjust Up Adjust Up: To increase the output, add a resistor 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). 11,12,13 L O A D COM COM Table 1 PT6670 ADJUSTMENT RANGE AND FORMULA PARAMETERS Series Pt # 3.3V Bus 5.0V Bus PT6671 PT6672 PT6675 PT6673 PT6674 Vo(nom) Va(min) 5.0V 9.0V 12.0V 3.8V 8.2V 9.6V Va(max) 5.5V 9.2V 12.8V 48.75 47.41 80.6 54.9 Ko (V·kΩ Ω) 25.0 Ω) Rs (kΩ 4.99 Table 2 PT6670 ADJUSTMENT RESISTOR VALUES Series Pt # 3.3V Bus 5.0V Bus PT6671 PT6672 PT6675 PT6673 PT6674 9.0V 12.0V Vo(nom) Va(req’d) 5.0V 3.8 (5.8)kΩ 8.2 (58.3)kΩ 3.9 (7.7)kΩ 8.4 (111.0)kΩ 4.0 (10.0kΩ 8.6 (217.0)kΩ 4.1 (12.8)kΩ 8.8 (534.0)kΩ 4.2 (16.3)kΩ 9.0 4.3 (20.7)kΩ 9.2 4.4 (26.7)kΩ 9.4 4.5 (35.0)kΩ 9.6 4.6 (47.5)kΩ 9.8 (8.0)kΩ 4.7 (68.3)kΩ 10.0 (16.2)kΩ 4.8 (110.0)kΩ 10.2 (26.2)kΩ 4.9 (235.0)kΩ 10.4 (38.7)kΩ 10.6 (54.8)kΩ Va(req’d) 5.0 163.0kΩ (1.2)kΩ 5.1 245.0kΩ 10.8 (76.3)kΩ 5.2 120.0kΩ 11.0 (106.0)kΩ 5.3 78.3kΩ 11.2 (151.0)kΩ 5.4 57.5kΩ 11.4 (226.0)kΩ 5.5 45.0kΩ 11.6 (376.0)kΩ 11.8 (827.0)kΩ 12.0 R1 = (Blue) For technical support and more information, see inside back cover or visit www.ti.com/powertrends R2 = Black 12.2 182.0kΩ 12.4 63.3kΩ 12.6 24.1kΩ 12.8 4.4kΩ 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 2000, Texas Instruments Incorporated IMPORTANT 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, either express or implied, is granted under any patent right, copyright, mask work right, or other 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 2000, Texas Instruments Incorporated