LTC2920-2CMS8#TR Linear Technology, LTC2920-2CMS8#TR Datasheet
LTC2920-2CMS8#TR
Specifications of LTC2920-2CMS8#TR
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LTC2920-2CMS8#TR Summary of contents
Page 1
... Supply “Margining”). The LTC2920 uses a single resistor to set the voltage margining current. The margining current is adjustable over a 400:1 range. Precision margin currents can be supplied to within 0.6V of ground or V The LTC2920 single margining controller ...
Page 2
... Current— IMHIGH MARGIN Sourcing or Sinking Output Voltage Compliance Operating Temperature Range LTC2920-1C/LTC2920-2C ....................... 0°C to 70°C + 0.3V) LTC2920-1I/LTC2920-2I .................... – 40°C to 85° 0.3V) Storage Temperature Range ................. – 65°C to 150°C CC Lead Temperature (Soldering, 10 sec).................. 300° LTC2920-1CS5 TOP VIEW LTC2920-1IS5 IN2 2 ...
Page 3
... I less 0.2V. Note 5: Determined by design, not production tested ⏐ Note 6: 1 – (I > 4V: 0.58 ≤ and I are ⏐ Note 7: 1 – (I accuracy will vary within ≤ 20pF LTC2920-1/LTC2920-2 MIN TYP MAX ● 3 7.5 ● ● ● ● ● ● 3 7.5 ● ...
Page 4
... I Power Filtering in the pin is a high impedance output. Internally, the IN1 pin is connected to a 1.2V voltage source by an internal ~10k resistor. The LTC2920 has an internal RC circuit to sup- press noise entering from this pin. LTC2920-2 Only R ...
Page 5
... V (V) MARGIN 2920-1/2 G04 I Rise Time MARGIN HIGH RANGE V IN(DELAYON) ENDS 0% LOW RANGE HIGH RANGE 1μs/DIV LTC2920-1/LTC2920 Low Range CC MARGIN Sourcing Current 1800 1600 2 CHANNELS 1400 1200 1000 800 1 CHANNEL 600 400 200 100 120 140 160 180 I (μ ...
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... VOLTAGE MARGINING POWER SUPPLIES USING A FEEDBACK PIN One common power supply architecture supported by the LTC2920 is a power supply with a feedback pin and two feedback resistors. Even complicated switching power supplies can be typically modeled as a simple amplifier with a reference voltage and a two resistor feedback network (Figure 1) ...
Page 7
... Traditionally such power supply modules are margined by calculating the two resistors, and alternately connecting each Figure 3 shows how the LTC2920 can be used in these applications as well. Using the LTC2920 for these applica tions can save a significant amount of PCB real estate V and cost. ...
Page 8
... Containing a Feedback Pin and Two Feedback Resistors Calculating the value of the current setting resistor, R for a power supply with a feedback pin is straight forward. When the LTC2920 is being added to an existing power supply design, the power supply feedback resistors R R have already been selected. By knowing R ...
Page 9
... Type Power Supply Modules ‘Brick’ power supply modules often have a trim pin which can be used for voltage margining. Figure 7 shows a typical connection using the LTC2920 for voltage margin- ing a power supply module. The amount of current necessary to adjust the output voltage of the power supply module is not normally given directly by the manufacturer ...
Page 10
... The LTC2920 can source or sink current only when the voltage at the I In order to be sure that the LTC2920 will operate correctly in this application, ensure that the V these limits this, calculate the effective output resistance of the power supply module’s trim output pin, R (refer to Figure 10) ...
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... U U APPLICATIO S I FOR ATIO the I specification does not fall within this MACCURACY T range, the LTC2920 cannot be used for this application. + SENSE + + TRIM + R V TRIM – REF – V – – SENSE Figure 10. Power Module I Accuracy of Power Supply Voltages when Margining The accuracy of margined power supply voltages depends on several factors ...
Page 12
... V IN pin of the LTC2920 fault M and I pins Connecting V Supply Being Margined not practical to power the LTC2920-1 from the the power supply being margined, connect the OUT V pin of the LTC2920-1 using a Schottky diode (Fig the IN OUT ure 15). This solution works with power supply feedback voltages of less than 1 ...
Page 13
... IN occur. Connecting V Supplies Being Margined not practical to power the LTC2920-2 from the V and/or V connect the V diode (Figure 18). This solution works with power supply feedback voltages less that 1.5V and I >30μA. Be sure to account for the diode drop across all temperatures to ensure the LTC2920-2 V specifications are met ...
Page 14
... S must be known. Refer to the power supply manufacturer’s can be data sheet for this voltage. The voltage at the I BYP be within specified limits of the LTC2920, including the voltage drop across R supply feedback pin voltage is 1.21V, I and V is 3.3V. To maintain LTC2920 current accuracy, CC ...
Page 15
... TYP GAUGE PLANE 0.53 ± 0.152 (.021 ± .006) DETAIL “A” 0.18 (.007) SEATING PLANE LTC2920-1/LTC2920-2 2.90 BSC (NOTE 4) 0.30 – 0.45 TYP 5 PLCS (NOTE 3) 0.01 – 0.10 1.90 BSC S5 TSOT-23 0302 3.00 ± 0.102 (.118 ± .004) ...
Page 16
... SET 188.3k 2920-1/2 TA02 BYP B 0.1μF 500Ω 3.57k + OUT 100μF 6. × LTC2920 IN THREE-STATE GND 21.5k – 1.3V) Compliance CC LT/LT 0505 REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2003 V OUT 3.3V 4.5A SYSTEM CONTROLLER GND 2920-1/2 TA03 292012fa ...