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LTC1871IMS Datasheet(PDF) 1 Page - Linear Technology |
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LTC1871IMS Datasheet(HTML) 1 Page - Linear Technology |
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1 / 36 page  LTC1871 1 1871fe TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Wide Input Range, No RSENSE™ Current Mode Boost, Flyback and SEPIC Controller The LTC®1871 is a wide input range, current mode, boost, flyback or SEPIC controller that drives an N-channel power MOSFET and requires very few external components. In- tended 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 50kHz to 1MHz 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 LTC1871 ideally suited for battery-operated systems. For applications requiring constant frequency opera- tion, Burst Mode operation can be defeated using the MODE/SYNC pin. Higher output voltage boost, SEPIC and flyback applications are possible with the LTC1871 by connecting the SENSE pin to a resistor in the source of the power MOSFET. The LTC1871 is available in the 10-lead MSOP package. Efficiency of Figure 1 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 ±1% Internal Voltage Reference n Micropower Shutdown: IQ = 10μA n Programmable Operating Frequency (50kHz to 1MHz) 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 and Burst Mode are registered trademarks of Linear Technology Corporation. No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Figure 1. High Efficiency 3.3V Input, 5V Output Boost Converter (Bootstrapped) + RUN ITH FB FREQ MODE/SYNC SENSE VIN INTVCC GATE GND LTC1871 RT 80.6k 1% R2 37.4k 1% R1 12.1k 1% CVCC 4.7μF X5R CIN 22μF 6.3V ×2 M1 D1 L1 1μH RC 22k CC1 6.8nF CC2 47pF COUT1 150μF 6.3V ×4 VIN 3.3V VOUT 5V 7A (10A PEAK) GND 1871 F01a + COUT2 22μF 6.3V X5R ×2 CIN: TAIYO YUDEN JMK325BJ226MM COUT1: PANASONIC EEFUEOJ151R COUT2: TAIYO YUDEN JMK325BJ226MM D1: MBRB2515L L1: SUMIDA CEP125-H 1R0MH M1: FAIRCHILD FDS7760A OUTPUT CURRENT (A) 30 90 100 80 50 70 60 40 0.001 0.1 1 10 1871 F01b 0.01 Burst Mode OPERATION PULSE-SKIP MODE |
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