PT6900 Series 12 Watt 5V/3.3V Input Plus to Minus Voltage Converter SLTS041A (Revised 6/30/2000) • • • • • +5V/+3.3V Input Voltage Negative Output Remote Sense Adjustable Output Voltage 23-pin SIP Package The PT6900 is designed to supply regulated negative voltages for powering the latest ECL (-5.2V) and GaAs (-2.0V) ICs used in high-speed fiber optic communications. A 330µF electrolytic capacitor is required on the input and output for proper operation. Please note that this product is not short-circuit protected. The PT6900 is a series of highperformance ISRs, that provide plus to minus voltage conversion, up to 12 watt in a 23-pin SIP package. Pin-Out Information Pin Function Standard Application V ADJ Remote Sense 2 3-7 +VIN 22 PT6900 + Cin 9-15 16-21 -V OUT 8 Cout + GND GND Remote Sense C in = Required 330µF electrolytic C out = Required 330µF electrolytic Ordering Information Pin Function +5V Input ❏ PT6904❑ ❑ = –2.0V PT6901❏ ❏ PT6905❑ ❑ = –5.2V PT6902❏ ❑ PT6903❑ = –1.5V 1 Do not connect 13 GND 2 Vout Adjust 14 GND 3 Vin 15 GND 4 Vin 16 Vout 5 Vin 17 Vout 6 Vin 18 Vout 7 Vin 19 Vout 8 Remote Sense GND 20 Vout +3.3V Input PT Series Suffix (PT1234X) 9 GND 21 Vout 10 GND 22 Remote Sense Vout 11 GND 23 Do not connect 12 GND Case/Pin Configuration Vertical Through-Hole Horizontal Through-Hole Horizontal Surface Mount N A C (For dimensions and PC board layout, see Package Styles 1100 and 1110.) Specifications PT6900 SERIES Characteristics (Ta= 25°C unless noted) Symbols Output Current Io Conditions Ta = +25°C, natural convection Vin =5.0V Vo = –2.0V / –1.5V Vo = –5.2V Vin =3.3V Vo = –2.0V Vo = –5.2V 0.1A ≤ Io ≤ I max Input Voltage Range Output Voltage Tolerance ∆Vo Output Adjust Range Vo PT6901 PT6902/PT6903 PT6904/PT6905 Nominal Vin, Io = I max 0°C ≤ Ta ≤ +60°C Pin 14 to Vo or GND Vo = –2.0V Vo = –5.2V Vo = –1.5V Min Typ Max Units 0.1 (1) 0.1 (1) 0.1 (1) 0.1 (1) — — — — 6.0 3.5 5.0 2.5 4.5 3.1 — — 5.5 3.6 V Vo – 0.05 — Vo + 0.05 V –1.4 –2.7 –1.2 — — — –4.4 –6.5 –3.4 V (2) (2) A (2) (2) A Line Regulation Regline Over Vin range, I o =I max — ±0.5 ±1.0 % Load Regulation Regload Vin =V nom, 0.1 ≤ Io ≤ Imax — ±0.5 ±1.0 % Vo Ripple/Noise Vn Vin = V nom, Io =I max Transient Response with Cout = 330µF ttr Vos Io step between 0.5xImax Vo over/undershoot Vo = –1.5V / –2.0V Vo = –5.2V and I max — — — — 40 50 200 200 — — — — Efficiency η Vin =+5V, Io =0.5xImax Vo = –1.5V Vo = –2.0V Vo = –5.2V — — — 65 70 77 — — — % Vo = –2.0V Vo = –5.2V — — 67 75 — — % Vin = +3.3V, Io =0.5xImax mV µSec mV Switching Frequency ƒo Over Vin and Io ranges 500 — 600 kHz Absolute Maximum Operating Temperature Range Ta Over Vin Range 0 — +85 (2) °C -40 — +125 °C Vertical/Horizontal — 28/33 — grams Storage Temperature Ts Weight — Notes: (1) ISR-will operate down to no load with reduced specifications. (2) See SOA curves or contact the factory for the approrpiate derating. For technical support and more information, see inside back cover or visit www.ti.com/powertrends Vout Typical Characteristics PT6900 Series 12 Watt 5V/3.3V Input Plus to Minus Voltage Converter 5.0V Input Voltage 3.3V Input Voltage (See Note A) Efficiency vs Output Current (See Note A) Efficiency vs Output Current 90 90 80 70 PT6902 PT6901 PT6903 60 Efficiency - % Efficiency - % 80 PT6905 PT6904 70 60 50 40 50 0 1 2 3 4 5 0 6 1 2 Iout (A) Power Dissipation vs Output Current 4 5 Power Dissipation vs Output Current 8 8 6 6 PT6902 PT6901 PT6903 4 Pd - Watts Pd - Watts 3 Iout (A) 2 PT6905 PT6904 4 2 0 0 0 1 2 3 4 5 6 0 1 2 Iout (A) 3 4 5 Iout (A) Ripple vs Output Current Ripple vs Output Current 50 40 40 PT6902 PT6901 PT6903 20 Ripple - mV Ripple - mV 30 30 PT6905 PT6904 20 10 10 0 0 0 1 2 3 4 5 6 0 1 2 Iout (A) Safe Operating Area, PT6901 (Vin =5.0V) (See Note B) 4 5 Safe Operating Area, PT6902 (Vin =5.0V) 90 90 80 80 70 Airflow 200LFM 120LFM 60LFM N at co nv 60 50 40 Ambient Temperature ( C) Ambient Temperature ( C) 3 Iout (A) 70 (See Note B) Airflow 200LFM 120LFM 60LFM Nat conv 60 50 40 30 30 20 20 0 1 2 3 Iout (A) 4 5 6 0 0.5 1 1.5 2 2.5 3 3.5 4 Iout (A) Note A: All data listed in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the DC-DC Converter. Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum operating temperatures For technical support and more information, see inside back cover or visit www.ti.com/powertrends Application Notes PT6900/6910 Series The negative output voltage of the Power Trends PT6900 Series ISRs may be adjusted higher or lower than the factory trimmed pre-set voltage with the addition of a single external resistor. Table 1 gives the allowable adjustment range for each model in the series as Va (min) and Va (max). Figure 1 22 Vo(sense) 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. Only a single 1% resistor is required in either the (R1) or R2 location. Do not use (R1) and R2 simultaneously. Place the resistor as close to the ISR as possible. 2. Never connect capacitors from Vo adjust to either GND, Vout, or the Sense pins. Any capacitance added to the Vo adjust pin will affect the stability of the ISR. 3. If the sense pins are not being used, the resistors (R1) and R2 can be connected to Vout and GND respectively. 4. An increase in the output voltage must be accompanied by a corresponding reduction in the maximum output current. The revised maximum output current must be reduced to the equivalent of 12Watts. i.e. Iout (max) = 12 Va PT6900 +Vin GND Vo(adj) 9 - 15 2 -Vo 16 - 21 Vout(-) GND(sense) 8 (R1) (Down) + Adjust Up: An increase in the output voltage is obtained by adding a resistor R2, between pin 2 (Vo adjust) and pin 8 (Remote Sense GND). Adjust Down: Add a resistor (R1), between pin 2 (Vo adjust) and pin 22 (Remote Sense Vo). 3-7 +Vin C in R2 (Up) + Adjusting the Output Voltage of the PT6900/PT6910 Positive to Negative Converter Series C out L O A D COM COM The respective values of (R1) [adjust down], and R2 [adjust up], can also be calculated using the following formulas. (R1) = R2 = 24.9 (Va – Vr) – Rs kΩ (Vo – Va) 24.9 Vr – Rs (Va – Vo) kΩ Where: Vo Va Vr Rs = Original output voltage = Adjusted output voltage = Reference voltage in Table 1 = The resistance given in Table 1 Adc, where Va is the adjusted output voltage. Table1 PT6900/PT6910 ADJUSTMENT RANGE AND FORMULA PARAMETERS Series Pt # 5.0V Bus 3.3V Bus PT6903/13 PT6901/11 PT6904/14 PT6902/12 PT6905/15 Vo (nom) Va (min) -1.5V -2.0V -5.2V -1.2V -1.4V -2.7V Va (max) Vr -3.4V -4.5V -6.5V -1.0V -1.0V -0.92V Ω) Rs (kΩ 12.7 10.0 17.4 For technical support and more information, see inside back cover or visit www.ti.com/powertrends Application Notes continued PT6900/6910 Series Table 2 PT6900/PT6910 ADJUSTMENT RESISTOR VALUES Series Pt # 5.0V Bus 3.3V Bus Vo (nom) Va (req’d) PT6903/13 PT6901/11 PT6904/14 –2.0Vdc –1.5Vdc PT6902/12 PT6905/15 –5.2Vdc Series Pt # 5.0V Bus 3.3V Bus Vo (nom) Va (req’d) PT6903/13 –1.5Vdc PT6901/11 PT6904/14 –2.0Vdc PT6902/12 PT6905/15 –5.2Vdc –1.2 (3.9)kΩ –3.9 3.1kΩ (39.7)kΩ –1.3 (24.7)kΩ –4.0 2.5kΩ (46.5)kΩ –1.4 (86.9)kΩ (6.6)kΩ –4.1 1.9kΩ (54.6)kΩ (14.9)kΩ –4.2 1.3kΩ (64.3)kΩ (76.1)kΩ –1.5 –1.6 236.0kΩ (27.4)kΩ –4.3 0.8kΩ –1.7 112.0kΩ (48.1)kΩ –4.4 0.4kΩ (90.9)kΩ –1.8 70.3kΩ (89.6)kΩ -4.5 0.0kΩ (106.0)kΩ –1.9 49.6kΩ (214.0)kΩ –4.6 (135.0)kΩ –2.0 37.1kΩ –4.7 (171.0)kΩ –2.1 28.8kΩ 239.0kΩ –4.8 (224.0)kΩ –2.2 22.9kΩ 115.0kΩ –4.9 (313.0)kΩ –2.3 18.4kΩ 73.0kΩ –5.0 (491.0)kΩ –2.4 15.0kΩ 52.3kΩ –5.1 (1020.0)kΩ –2.5 12.2kΩ 39.8kΩ –5.2 –2.6 9.9kΩ 31.5kΩ –5.3 212.0kΩ –2.7 8.1kΩ 25.6kΩ (0.3)kΩ –5.4 97.1kΩ –2.8 6.5kΩ 21.1kΩ (2.1)kΩ –5.5 59.0kΩ –2.9 5.1kΩ 17.7kΩ (4.0)kΩ –5.6 39.9kΩ –3.0 3.9kΩ 14.9kΩ (6.1)kΩ –5.7 28.4kΩ –3.1 2.9kΩ 12.6kΩ (8.5)kΩ –5.8 20.8kΩ –3.2 2.0kΩ 10.8kΩ (11.0)kΩ –5.9 15.3kΩ –3.3 1.1kΩ 9.2kΩ (13.8)kΩ –6.0 11.2kΩ –3.4 0.4kΩ 7.8kΩ (16.9)kΩ –6.1 8.1kΩ –3.5 6.6kΩ (20.4)kΩ –6.2 5.5kΩ –3.6 5.6kΩ (24.3)kΩ –6.3 3.4kΩ –3.7 4.7kΩ (28.7)kΩ –6.4 1.7kΩ –3.8 3.8kΩ (33.8)kΩ –6.5 0.2kΩ R1 = (Blue) R2 = Black For technical support and more information, see inside back cover or visit www.ti.com/powertrends 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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