MCP1650EV Microchip

MCP1650/51/52/53 M 750 kHz Boost Controller Features Description Output Power Capability Over 5 Watts The MCP1650/51/52/53 is a 750 kHz gated oscillator boost controller packaged in an 8 or 10-pin MSOP Output Voltage Capability From 3.3V to Over package. Developed for high-power, portable applica- 100V tions, the gated oscillator controller can deliver 5 watts 750 kHz Gated Oscillator Switching Frequency of power to the load while consuming only 120 A of Adaptable Duty Cycle for Battery or Wide-Input, quiescent current at no load. The MCP1650/51/52/53 Voltage-Range Applications can operate over a wide input voltage range (2.0V to Input Voltage Range: 2.0V to 5.5V 5.5V) to accommodate multiple primary-cell and single- Capable of SEPIC and Flyback Topologies cell Li-Ion battery-powered applications, in addition to 2.8V, 3.3V and 5.0V regulated input voltages. Shutdown Control with I < 0.1 A (Typical) Q = 120 A Low Operating Quiescent Current: I An internal 750kHz gated oscillator makes the Q MCP1650/51/52/53 ideal for space-limited designs. Voltage Feedback Tolerance (0.6%, Typical) The high switching frequency minimizes the size of the Popular MSOP-8 Package external inductor and capacitor, saving board space Peak Current Limit Feature and cost. The internal oscillator operates at two differ- Two Undervoltage Lockout (UVLO) Options: ent duty cycles depending on the level of the input volt- - 2.0V or 2.55V age. By changing duty cycle in this fashion, the peak input current is reduced at high input voltages, reducing Operating Temperature Range: -40C to +125C output ripple voltage and electrical stress on power train components. When the input voltage is low, the Applications duty cycle changes to a larger value in order to provide High-Power Boost Applications full-power capability at a wide input voltage range High-Voltage Bias Supplies typical of battery-powered, portable applications. White LED Drivers and Flashlights The MCP1650/51/52/53 was designed to drive external Local 3.3V to 5.0V Supplies switches directly using internal low-resistance MOSFETs. Local 3.3V to 12V Supplies Local 5.0V to 12V Supplies Additional features integrated on the MCP1650/51/52/ 53 family include peak input current limit, adjustable LCD Bias Supply output voltage/current, low battery detection and power-good indication. Package Types 8-Pin MSOP 8-Pin MSOP EXT 1 8 V EXT 1 8 V IN IN GND 2 GND 2 7 NC 7 LBO CS 3 CS 3 6 NC 6 LBI 4 4 FB 5 SHDN FB 5 SHDN 8-Pin MSOP 10-Pin MSOP EXT V 1 10 1 IN EXT 8 V IN GND PG 2 9 GND 2 7 PG CS LBO 3 3 8 CS 6 NC FB 4 LBI 7 FB 4 5 SHDN NC SHDN 5 6 2004 Microchip Technology Inc. DS21876A-page 1 MCP1650 MCP1652 MCP1653 MCP1651MCP1650/51/52/53 MCP1650 Block Diagram MCP1650 V IN + 1R 0.122V Internal Osc. with + - 2 fixed Duty Cycles 1.22V - 9R V HIGH ISNS V DUTY Ref Osc. V LOW Soft- DC = 80% V < 3.8V IN Start V HIGH DC = 56% V > 3.8V ON/ IN OFF V DUTY CS V IN OSC. OUT Current Limit + - V REF GND V LOW V SHDN IN ON/OFF Control DR S Pulse EXT Voltage Feedback FB Latch + Q R - V REF 1.22V DS21876A-page 2 2004 Microchip Technology Inc. - +