For assistance or to order, call Application Notes Mechanical Outline Product Selector Guide (800) 531-5782 PT6420 Series 3 AMP ADJUSTABLE INTEGRATED SWITCHING REGULATOR • • • • • Adjustable Output Voltage 85% Efficiency Small SIP Footprint Input Voltage Range: 4.5V to 5.5V Remote Sense Capability Pin-Out Information Standard Application Remote Sense 1 VIN 4,5,6 PT6420 VOUT 11,12,13 R1 C1 100µF + 7,8,9,10 14 (VOUP) C2 100µF + R2 (VODOWN) COM COM C1 = Required 100µF electrolytic C2 = Required 100µF electrolytic Specifications Pin Function 1 Remote Sense 2 Do not connect 3 Do not connect 4 Vin 5 Vin 6 Vin 7 GND 8 GND 9 GND 10 11 GND Vout 12 Vout 13 Vout 14 Vout Adjust Revised 5/15/98 The PT6420 is a new addition to the Power Trends high performance +5V to +3.3V, 3Amp family of 14-Pin SIP (Single In-line Package) Integrated Switching Regulators (ISRs). Only two external capacitors are required for proper operation. Please note that this product does not include short circuit protection. Ordering Information PT Series Suffix (PT1234X) PT6424¨ PT6425¨ PT6426¨ PT6427¨ PT6428¨ PT6429¨ Case/Pin Configuration Vertical Through-Hole Horizontal Through-Hole Horizontal Surface Mount = +1.5 Volts = +3.3 Volts = +1.8 Volts = +2.1 Volts = +1.2 Volts = +2.5 Volts Pkg Style 310 Note: Back surface of product is conducting metal. PT6420 POWER TRENDS PT6420 SERIES Characteristics (Ta = 25°C unless noted) Symbols Conditions Min Typ Max Units Output Current Io 4.5V ≤ V in ≤ 5.5V 0 — 3.0 A Current Limit Icl Vin = +5V — 3.6 5.0 A Input Voltage Range Vin 0.1A ≤ Io ≤ 3.0A 4.5 — 5.5 V Output Voltage Tolerance ∆Vo Vin = +5V, Io = 3.0A 0°C ≤ Ta ≤ +70°C Vo-0.05 3.3 Vo+0.05 V Line Regulation Regline 4.5V ≤ V in ≤ 5.5V, Io = 3.0A — ±10 ±25 mV Load Regulation Regload Vin = +5V, 0.3 ≤ Io ≤ 3.0A — ±10* ±25* mV Vo Ripple/Noise Vn Vin = 5V, Io = 3.0A — 66 165 mVpp Transient Response with C2 = 100µF ttr Vos Io step between 1.5A and 3.0A Vo over/undershoot — — 200 200 — — µSec mV Efficiency η Vin = +5V, Io = 1.5A — — — — 85 74 77 63 — — — — % % % % Switching Frequency ƒo 4.5V ≤ V in ≤ 5.5V 0.3A ≤ Io ≤ 3.0A 500 650 800 kHz Absolute Maximum Operating Temperature Range Ta 0 — +85 °C Recommended Operating Temperature Range Ta 0 — +70** °C Vo= 3.3V Vo= 1.8V Vo= 2.1V Vo= 1.2V Free Air Convection (40-60 LFM) At Vin= 5V, Io=2.5A Thermal Resistance θja Free Air Convection (40-60 LFM) — 25 — °C/W Storage Temperature Ts — -40 — +125 °C Mechanical Shock Per Mil-STD-883D, Method 2002.3 , 1 msec, Half Sine, mounted to a fixture — 500 — G’s Mechanical Vibration Per Mil-STD-883D, Method 2007.2, 20-2000 Hz, Soldered in a PC board — 15 — G’s — — 6.5 — grams Weight — *When used with remote sense function. **See Thermal Derating chart. Note: The PT6420 Series requires two 100µF electrolytic or tantalum capacitors for proper operation in all applications. 26 P D E Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com For assistance or to order, call PT6420 CHARACTERISTIC Efficiency vs Output Current 100 90 4.5V 70 5.0V 5.5V 60 50 90 Vin 80 4.5 V 5.0 V 70 5.5 V 60 Efficiency - % Efficiency - % Vin 80 1.0 1.5 2.0 2.5 3.0 0 0.5 1 Iout-(Amps) 1.5 2 2.5 Ripple vs Output Current 80 60 V in 5 .5V 40 5 .0V Ripple-(mV) 100 0 1 2 2.5 2.5 3 80 5.5V 60 5.0V 40 4.5V Vin 60 5.5V 5.0V 4.5V 40 20 0 0 0.5 1 Iout-(Amps) Thermal Derating (Ta) 2 Ripple vs Output Current Vin 3 1.5 2 2.5 0 3 0.5 1 Iout-(Amps) Thermal Derating (Ta) (See Note 2) 1.5 2 2.5 3 Iout-(Amps) Thermal Derating (Ta) (See Note 2) 3 3 1.5 100 0 0 1.5 0.5 Iout-(Amps) 20 4 .5V 20 1 5.5V Ripple vs Output Current 80 0.5 5.0V 60 Iout-(Amps) 100 0 4.5V 3 Ripple-(mV) 0.5 Vin 70 40 40 0.0 80 50 50 40 (See Note 1) Efficiency vs Output Current 10 0 90 Ripple-(mV) PT6425, 3.3 VDC (See Note 1) (See Note 2) 3 85°C 85°C 2 2 1.5 1 2.5 2 Iout-(Amps) 2.5 Iout-(Amps) Iout-(Amps) 85°C 2.5 1.5 1 1.5 1 0.5 0.5 0.5 0 0 0 4.5 4 .7 5 5 5 .2 5 4.5 4.5 5.5 4.75 Vin-(Volts) 5.25 4.75 Power Dissipation vs Output Current 5 5.25 5.5 5.5 Vin-(Volts) Vin-(Volts) Power Dissipation vs Output Current 3.0 Power Dissipation vs Output Current 2.5 2 1.8 Vin 5.5V 1.5 5.0V 4.5V 1.0 PD-(Watts) 2.0 Vin 2 5 .5 V 1.5 5 .0 V 4 .5 V 1 0.0 0.5 1.0 1.5 2.0 Iout-(Amps) 2.5 3.0 1.2 5.5V 1 5.0V 0.8 4.5V 0.4 0.2 0 0.0 Vin 1.4 0.6 0.5 0.5 1.6 PD-(Watts) 2.5 PD-(Watts) 5 0 0.5 1 1.5 2 2.5 3 0 0 Iout-(Amps) 0.5 1 1.5 2 2.5 3 Iout-(Amps) Note 1: All data listed in the above graphs except for derating data has been developed from actual products tested at 25°C. This data is considered typical data for the ISR. Note 2: Thermal derating graphs are developed in free air convection cooling of 40-60 LFM. (See Thermal Application Notes.) Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http:// www.powertrends.com 27 DATA SHEETS Efficiency vs Output Current 10 0 Efficiency - % DATA PT6427, 2.1 VDC (See Note 1) Series 5V5V to Bus 3.x Converters Products PT6428 1.2 VDC (800) 531-5782 For assistance or to order, call Application Notes (800) 531-5782 PT6420 Series More Applcation Notes Adjusting the Output Voltage of the PT6420 Series 3AMP 5V Bus Converters Figure 1 The output voltage of the Power Trends PT6420 Series ISRs may be adjusted higher or lower than the factory trimmed preset voltage with the addition of a single external resistor. Table 1 accordingly gives the allowable adjustment range for each model in the series as Va (min) and Va (max). Adjust Up: (See note 1) An increase in the output voltage is obtained by adding a resistor R1, between pin 14 (Vo adjust) and pins 11-13 (Vout). 1 Vsense 4,5,6 Vin Vin PT6420 GND Vo 7,8,9,10 C1 100 µF 11,12,13 Vo Vo(adj) 14 R1 Adjust Up + + C2 100 µF L O A D (R2) Adj Down COM COM Adjust Down: (See note 1) Add a resistor (R2), between pin 14 (Vo adjust) and pins 7-10 (GND). The values of R1 [adjust up], and (R2) [adjust down], can also be calculated using the following formulae. Refer to Figure 1 and Table 2 for both the placement and value of the required resistor; either R1 or (R2) as appropriate. Notes: 1. The direction in which each resistor adjusts the output of the PT6420 series differs from many other Power Trends products. These output voltage adjustment notes are therefore specific only to the PT6420 models. 2. Use only a single 1% resistor in either the R1 or (R2) location. Place the resistor as close to the ISR as possible. 3. Never connect capacitors from Vo adjust to either GND, Vout, or the Remote Sense pin. Any capacitance added to the Vo adjust pin will affect the stability of the ISR. R1 = 12.45 Vo (Va – Vo) (R2) = 12.45 (2Va – Vo) Vo – Va Where: Vo = Original output voltage Va = Adjusted output voltage – 49.9 kΩ – 49.9 kΩ 4. The PT6420 incorporates a Remote Sense (See Figure 1). If this feature is being used, connecting the resistor R1 between pin 14 (Vo adjust) and pin 1 (Remote Sense) can benefit load regulation. 5. An increase in the output voltage may place additional limits on the input voltage range of the part. The revised minimum input voltage will be (Vout + 1.2) or 4.5V, whichever is higher. Do not exceed 5.5Vdc. Table 1 PT6420 ADJUSTMENT RANGE Series Pt # PT6428 PT6424 PT6426 PT6427 PT6429 PT6425 Vo (nom) 1.2 1.5 1.8 2.1 2.5 3.3 Va (min) 1.1 1.3 1.5 1.8 2.1 2.8 Va (max) 1.4 1.8 2.2 2.6 3.1 3.8 Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com 3 For assistance or to order, call (800) 531-5782 Application PT6420 Series Notes Table 2 PT6420 ADJUSTMENT RESISTOR VALUES Series Pt # Vo (nom) Va (req’d) PT6428 1.2 1.1 (74.6)kΩ 1.15 (224.0)kΩ PT6424 1.5 PT6426 1.8 PT6427 2.1 PT6429 2.5 PT6425 3.3 1.2 1.25 249.0kΩ 1.3 99.5kΩ 1.35 49.7kΩ (49.7)kΩ 1.4 24.8kΩ (112.0)kΩ 1.45 (18.6)kΩ (299.0)kΩ 1.5 (0.0)kΩ 1.55 324.0kΩ (14.8)kΩ 1.6 137.0kΩ (37.3)kΩ 1.65 74.6kΩ (74.6)kΩ 1.7 43.5kΩ (149.0)kΩ 1.75 24.8kΩ (373.0)kΩ 1.8 12.4kΩ (12.4)kΩ 1.85 398.0kΩ (29.8)kΩ 1.9 174.0kΩ (55.9)kΩ 1.95 99.5kΩ (99.5)kΩ 2.0 62.2kΩ (187.0)kΩ 2.05 39.7kΩ (448.0)kΩ 2.1 24.8kΩ 2.15 14.1kΩ 473.0kΩ (14.1)kΩ 2.2 6.1kΩ (3.0)kΩ 212.0kΩ (29.0)kΩ 2.25 124.0kΩ (49.7)kΩ 2.3 80.8kΩ (80.8)kΩ 2.35 54.7kΩ (133.0)kΩ 2.4 37.3kΩ (236.0)kΩ 2.45 24.8kΩ (548.0)kΩ 2.5 15.5kΩ 2.55 8.2kΩ 573.0kΩ 2.6 2.4kΩ 261.0kΩ 2.65 158.0kΩ 2.7 106.0kΩ 2.75 74.6kΩ 2.8 53.9kΩ (7.4)kΩ 2.85 39.0kΩ (16.5)kΩ 2.9 27.9kΩ (27.9)kΩ 2.95 19.3kΩ (42.6)kΩ 3.0 12.4kΩ (62.2)kΩ 3.1 2.0kΩ (131.0)kΩ 3.2 (336.0)kΩ 3.3 3.4 361.0kΩ 3.5 156.0kΩ 3.6 87.0kΩ 3.7 52.8kΩ 3.8 R1 = Black 4 32.3kΩ R2 = (Red) Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com 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. 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