LT1305 LINER [Linear Technology], LT1305 Datasheet
LT1305
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LT1305 Summary of contents
Page 1
... The LT 1305 is a micropower step-up DC/DC converter that uses Burst Mode the LT1305 features a 2A internal low-loss switch and can deliver up to four times the output power of the LT1303. Quiescent current is only 120 A and the Shutdown pin further reduces current low-battery detector provides an open-collector output that goes low when the input voltage drops below a preset level ...
Page 2
... LBI LBO SHDN SHDN SHDN Note 2: Low-battery detector comparator is inoperative when device is in shutdown ORDER PART TOP VIEW NUMBER 8 PGND LT1305CS8 LBI S8 PART MARKING S8 PACKAGE 1305 = MIN TYP MAX 120 200 ...
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... TEMPERATURE ( C) LT1305 • G08 LT1305 Maximum Duty Cycle 100 –50 – 100 0 TEMPERATURE ( C) LT1305 • G03 Current Limit 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 – 50 – 100 TEMPERATURE (˚C) LT1305 • G06 FB Voltage 1.250 1.245 1.240 1.235 1.230 1 ...
Page 4
... GND (Pin 1): Signal Ground. Tie to PGND under the package. LBO (Pin 2): Open-Collector Output of Comparator C3. Can sink 100 A. High impedance when device is in shut- down. SHDN (Pin 3): Shutdown. Pull high to shut down the LT1305. Ground for normal operation. FB (Pin 4): Feedback Input. Connects to main comparator C1 input. 4 Switch Saturation Voltage 400 ...
Page 5
... OPERATION Operation of the LT1305 is best understood by referring to the Block Diagram in Figure 1. 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 120 A. When C1’ ...
Page 6
... R4 47k times have ESR above 1 , even for relatively large values such as 100 F, 16V units. Since the LT1305 has a 2A current limit ripple voltage would result with such a capacitor at the output. Keep ESR below 0.05 to 0.1 for reasonable ripple voltage. Tantalum capacitors such as AVX TPS series or Sprague 593D have low ESR and are surface mount components ...
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... AVX TPS OR SANYO OS-CON MUST HAVE ESR 0.15 4-Cell-to-5V Converter L1* 100 F** MBRS130LT3 100 F LT1305 309k SHDN GND PGND 100k SHUTDOWN MBRS130LT3 5V 400mA 309k + FB 220 F 100k LT1305 • TA06 C1* 50pF 4.7 F 160V + EL PANEL 1k 1/2W 10k ZETEX FZT658 C 100nF PANEL LT1305 • TA04 LT1305 5V 400mA + 150 F** LT1305 • TA05 7 ...
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... LT1305 PACKAGE DESCRIPTION 0.010 – 0.020 45 (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 0.016 – 0.050 0.406 – 1.270 *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm). RELATED PARTS PART NUMBER ...