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LTC3402 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3402 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  LTC1871X 1 1871xf For more information www.linear.com/LTC1871X TYPICAL APPLICATION FEATURES DESCRIPTION Wide Input Range, No RSENSE™ Current Mode Boost, Flyback and SEPIC Controller LTC®1871X is a wide input range, current mode, boost, flybackorSEPICcontrollerthatdrivesanN-channelpower MOSFET. LTC1871X is rated to 175°C junction tempera- ture and is 100% tested at 175°C. Intended for low to medium power applications, it eliminates the need for a current sense resistor by utilizing the power MOSFET’s on-resistance, thereby maximizing efficiency. The IC’s operating frequency can be set with an external resistor over a 65kHz to 900kHz range, and can be syn- chronized to an external clock using the MODE/SYNC pin. Burst Mode operation at light loads, a low minimum operating supply voltage of 2.5V and a low shutdown quiescent current of 10μA make the LTC1871X ideally suited for battery-operated systems. For applications requiring constant frequency operation, Burst Mode operation can be defeated using the MODE/ SYNC pin. Higher output voltage boost, SEPIC and flyback applications are possible with the LTC1871X by connect- ing the SENSE pin to a resistor in the source of the power MOSFET. The LTC1871X is available in the 10-lead MSOP package. Figure 1. High Efficiency 5V Input, 12V Output Boost Converter (Bootstrapped) APPLICATIONS n High Efficiency (No Sense Resistor Required) n Wide Input Voltage Range: 2.5V to 36V n Current Mode Control Provides Excellent Transient Response n High Maximum Duty Cycle (92% Typ) n ±2% RUN Pin Threshold with 100mV Hysteresis n ±2% Internal Voltage Reference n Micropower Shutdown: IQ = 10μA n Programmable Operating Frequency (65kHz to 900kHz) with One External Resistor n Synchronizable to an External Clock Up to 1.3 × fOSC n User-Controlled Pulse Skip or Burst Mode® Operation n Internal 5.2V Low Dropout Voltage Regulator n Output Overvoltage Protection n Capable of Operating with a Sense Resistor for High Output Voltage Applications n Small 10-Lead MSOP Package n Telecom Power Supplies n Portable Electronic Equipment L , LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks and No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. 1871x F01 SENSE LTC1871X VIN FB GATE GND RUN ITH INTVCC FREQ 80.6k 4.7µF 10nF 10µH VIN 5V VOUT 12V 2A GND MODE/SYNC 33.2k 100µF 6.3V 47µF 25V ×8 110k 12.4k FB Voltage vs Temperature TEMPERATURE (°C) –50 –25 0 25 50 75 100 125 150 175 200 1.210 1.215 1.220 1.225 1.230 1.235 1.240 1.245 1.250 1871x F01b |
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