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ILC6377SO-ADJ Folha de dados(PDF) 1 Page - Impala Linear Corporation |
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ILC6377SO-ADJ Folha de dados(HTML) 1 Page - Impala Linear Corporation |
1 / 11 page Impala Linear Corporation 1 (408) 574-3939 www.impalalinear.com June 1999 ILC6377 1.3 The ILC6377 is a 95% efficient, 300kHz step-down DC-DC converter in an SO-8 package; capable of delivering 500mA output current. The device is also capable of driving an external FET for higher output current applications. The ILC6377 uses a unique p-channel architecture with built-in charge pump to maintain low on-resistance, even at low input voltages. At high or normal currents the ILC6377 operates in PWM mode with 300kHz operating frequency. When the load current drops and the device hits approxi- mately 17% duty cycle, it automatically switches over to PFM or pulse skipping mode. PFM (pulse frequency mod- ulation) mode of operation extends efficiency at light loads. Start-up is controlled via an external soft-start capacitor. The device will automatically re-enter start-up mode when an output current overload condition is sensed; thus providing automatic short-circuit protection. Voltage lockout prevents faulty operation below the minimum operating voltage level. In shutdown, the ILC6377 consumes only 1.5mA current. The ILC6377SO-XX offers fixed 3.3V or 5V ouput while ILC6377SO-Adj allows adjustable output. Both versions of ILC6377 are available in an SO-8 surface mount package. ! ±2.5% accurate output voltages ! Guaranteed 500mA output current ! 95% efficiency ! 55mA no load battery input current ! 1.5mA shutdown current ! Built in short circuit and overcurrent protection ! Undervoltage lockout and soft-start ! External transistor drive available for higher Iout ! 300kHz operation ! Automatic switchover to PFM mode at low currents for longest battery life ! Fixed 3.3V or 5V or adjustable output ! SO-8 package ! Cellular Phones ! Palmtops and PDAs ! Portable Instrumentation ! Buck Converter for Industrial / Networking Applications PWM /PFM P rotection LX GND EXT1 RAMP WAVE VIN VOUT P_BST GATE DRIV ER GENERATOR, OSCILLATOR CONTROLLER + - PWM Comp EXT2 + - Error Amp 1 5 4 6 3 2 7 8 S/ D, So ftstar t, Vref S/D, Vref with Soft- start ILC6377 (TOP VIE W) 3 45 1 2 6 7 8 L X FB EXT1 S/D, GND P_BST EXT2 V IN ILC6377SO- Adj C SS SO- 8 Package ILC6377 (TOP VIE W) 3 L X V OUT EXT1 45 S/D, GND 1 2 6 7 8 P_BST EXT2 V IN C SS SO-8 Package ILC6377SO- XX Ordering Information ILC6377SO-33 3.3V, 300 kHz step-down PWM/PFM converter ILC6377SO-50 5V, 300 kHz step-down PWM/PFM converter ILC6377SO-Adj Adjustable, 300 kHz step-down PWM/PFM converter Pin Symbol Function 1 VIN Power Supply 2 EXT2 External gate drive pin (low when P-Ch FET is ON) 3 P-BST P-Ch gate boost 4 S/D Softstart, Vref Shutdown, also soft-start capacitor pin and Vref output 5 VOUT/FB Output voltage sense pin for ILC6377SO-XX; 1V feedback for ILC6377SO adj 6 GND Ground connection 7 EXT1 External gate drive pin (low when P-Ch FET is on) 8 LX Inductor switch pin ILC6377 0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown Impala Linear Corporation General Description Features Applications Block Diagram Pin Package Configurations Pin Description |
Nº de peça semelhante - ILC6377SO-ADJ |
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Descrição semelhante - ILC6377SO-ADJ |
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