LT1303 Linear Technology Corporation, LT1303 Datasheet
LT1303
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LT1303 Summary of contents
Page 1
... They are ideal for use in small, low-voltage battery- operated systems. The LT1303-5 accepts an input voltage between 1.8V and 5V and converts regulated 5V. The LT1303 is an adjustable version that can supply an output voltage up to 25V. Quiescent current is only 120 A from the battery and the shutdown pin further reduces current ...
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... W W ABSOLUTE MAXIMUM V Voltage .............................................................. 10V IN SW1 Voltage ............................................................ 25V Sense Voltage (LT1303-5) ....................................... 20V FB Voltage (LT1303) ................................................ 10V Shutdown Voltage ................................................... 10V LBO Voltage ............................................................. 10V LBI Voltage .............................................................. 10V Maximum Power Dissipation ............................. 500mW Operating Temperature Range ..................... Storage Temperature Range ................. – 150 C Lead Temperature (Soldering, 10 sec).................. 300 C ...
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... TEMPERATURE ( C) FB Pin Bias Current 100 –50 – TEMPERATURE ( C) LT1303/LT1303-5 LT1303-5 Sense Pin Resistance to Ground 1000 900 800 700 600 500 400 300 –50 25 – 100 TEMPERATURE (˚C) LT1303 G02 Low Battery Detect Trip Point 1.250 1.245 1.240 1.235 1.230 1 ...
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... TEMPERATURE ( C) LT1303 G11 Switch Current Limit 1200 1100 1000 900 800 700 INPUT VOLTAGE (V) LT1303 G14 Low Battery Detector Transient Response V LBO 2V/DIV +10mV V TRIP V LBI V –10mV TRIP 5 s/DIV R = 47k PULL-UP 75 100 LT1303 G12 8 10 LT1303 G15 LT1303 G18 ...
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... Can sink 100 A. Disabled when device is in shutdown. SHDN (Pin 3): Shutdown. Pull high to shut down the device. Ground for normal operation. FB/Sense (Pin 4): On 1303 (adjustable) this pin connects to the main comparator C1 input. On LT1303-5 this pin connects to the resistor string that sets output voltage at 5V. W BLOCK ...
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... GND 1 U OPERATION Operation of the LT1303 is best understood by referring to the Block Diagram in Figure 2. When C1’s negative input, related to the output voltage by the appropriate resistor- divider ratio, is higher than the 1.24V reference voltage, C1’s output is low. C2, A3 and the oscillator are turned off, drawing no current. Only the reference and C1 consume current, typically 140 A. When C1’ ...
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... U U APPLICATIONS INFORMATION Inductor Section Inductors suitable for use with the LT1303 usually fall in the range. The inductor must: (1) handle current of 1.25A without saturating, (2) have enough inductance to provide a di/dt lower than 400mA/ s, and (3) have low enough DC resistance to avoid excessive heating or efficiency losses. Higher value inductors will deliver more power but tend to be physically larger ...
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... capacitor. The V should be decoupled with 100 F capacitor at the pin. When driving a transformer, an additional decoupling network of 10 and 0.1 F ceramic is recommended as shown in Figure 10. V LT1303 F09 Figure 10 Network to LT1303 V Additional Decoupling. Recommended When Driving Transformers. Table 2. Recommended Capacitors VENDOR AVX Sanyo ...
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... U TYPICAL APPLICATIONS INPUT 1.8V TO 4.5V V OUTPUT REF 1.24V + * SUMIDA CD54-220MC Setting Output Voltage on LT1303 1N5817 LT1303 100 F FB GND PGND R1 = 1.24V OUT R1 5V Step-Up Converter with Reference Output 22 H* 100k V IN LBO 2N3906 + LT1303-5 100 F LBI GND 2.2 F 33k LT1303/LT1303-5 V OUT ...
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... LT1303 SHDN GND PGND SHUTDOWN * SUMIDA CD54-100MC ** AVX TPS 220 F/10V MBRS130T3 10 H* 100k SHDN LB0 LT1303 + 33 F LBI FB GND PGND † 1.96k † 121k ZTX788B V OUT 5V 100mA + 33 F 220 F** LT1303TA05 Si9433 100 † 200k V 3.3V/200mA OUT + 330 F** 2 LT1303 TA07 ...
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... EL Panel Driver T1** MUR160 1:15 • 4,5 6 • 1,2 1N5818 3. 3.3M IN 0.1 F 3.3M LT1303 CERAMIC 1N4148 FB SHDN GND PGND 51k SHUTDOWN † R1 25k TO 115V RMS RMS LT1303/LT1303-5 C1* 50pF 4.7 F 160V + 1k EL PANEL 1/2W 10k MPSA42 LT1303 TA06 11 ...
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... LT1303/LT1303-5 PACKAGE DESCRIPTION 0.300 – 0.325 (7.620 – 8.255) 0.065 (1.651) 0.009 – 0.015 TYP (0.229 – 0.381) 0.005 (0.127) +0.025 0.325 MIN –0.015 +0.635 8.255 –0.381 0.100 0.010 (2.540 0.254) *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) 0.010 – ...