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LT1268B Datasheet(PDF) 1 Page - Linear Technology |
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LT1268B Datasheet(HTML) 1 Page - Linear Technology |
1 / 4 page ![]() 1 LT1268B/LT1268 7.5A, 150kHz Switching Regulators S FEATURE DESCRIPTIO s Wide Input Voltage Range: 3.5V to 30V s Low Quiescent Current: 7mA s Internal 7.5A Switch s Very Few External Parts Required s Self-Protected Against Overloads s Available in Standard and Surface Mount 5-Pin Packages s Can Be Externally Synchronized (See LT1072 Data Sheet) The LT1268B and LT1268 are monolithic high power switching regulators. Identical to the popular LT1070, except for switching frequency (150kHz) and higher switch current, they can be operated in all standard switching configurations including buck, boost, flyback, and inverting. A high current, high efficiency switch is included on the die along with all oscillator, control, and protection circuitry. Integration of all functions allows the LT1268 to be built in standard 5-pin power packages. This makes it extremely easy to use and provides “bust proof” operations similar to that obtained with 3-pin linear regulators. The LT1268 operate with supply voltages from 3.5V to 30V and draw only 7mA quiescent current. By utilizing current mode switching techniques, it provides excellent AC and DC load and line regulation. The LT1268 use an adaptive anti-sat switch drive to allow very wide ranging load currents with no loss in efficiency. An externally activated shutdown mode reduces total supply current to 100 µA typical for standby operation. USER NOTE: This data sheet is only intended to provide specifications, graphs, and a general functional description of the LT1268B/LT1268. Application circuits are included to show the capability of the LT1268B/LT1268. A complete design manual (AN19) should be obtained to assist in developing new designs. This manual contains a comprehensive discussion of both the LT1070 and the external components used with it, as well as complete formulas for calculating the values of these components. The manual can also be used for the LT1268B/LT1268 factoring in the higher switch current rating and higher operating frequency. APPLICATI TYPICAL Boost Regulator with 5.3V ±1% Output LOAD CURRENT (A) 0 80 90 4 LT1268 • TA02 70 60 1 2 3 100 VIN = 5.3V VIN = 4.7V VIN = 5V Efficiency of 5.3V Boost Converter VIN VSW LT1268B L1 8 µH, 5A* D1 MBR1035 D2, D3 † 1N4001 C2 0.068 C3 390 µF 16V R1 4.043k 0.1% R2 1.24k 0.1% R3 220 Ω FB GND VC CASE L2 2 µH, 5A** C1 220 µF 16V + + C4 390 µF 16V VOUT 5.3V ±1% 3.75A VIN 4.7V TO 5.3V LT1268 • TA01 COILTRONICS CTX8-5-52 COILTRONICS CTX2-5-52 OPTIONAL. D2 AND D3 ARE USED TO INCREASE UNDERVOLTAGE LOCKOUT FROM 2.7V TO ≈4V. * ** † + C5 0.02 S APPLICATI s High Efficiency Boost Converter s PC Power Supply with Multiple Outputs s Battery Upconverter s Negative-to-Positive Converter |
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