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LA8509 Dataheets PDF



Part Number LA8509
Manufacturers INNO-TECH
Logo INNO-TECH
Description 18V/3A Synchronous Step-Down DC-DC Converter
Datasheet LA8509 DatasheetLA8509 Datasheet (PDF)

LA8509 380KHz, 18V/3A Synchronous Step-Down DC-DC Converter General Description Features The LA8509 is a current mode, synchronous step-down DC-DC converter that is designed to meet 3A output current, and utilizes PWM control scheme that switches with 380KHz fixed frequency. The input voltage range of LA8509 is from 4.5V to 18V, and available in adjustable output voltage from 0.925V to 12V. The supply current is only 1.2mA during operation and under 1uA in shutdown. This device provides an e.

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LA8509 380KHz, 18V/3A Synchronous Step-Down DC-DC Converter General Description Features The LA8509 is a current mode, synchronous step-down DC-DC converter that is designed to meet 3A output current, and utilizes PWM control scheme that switches with 380KHz fixed frequency. The input voltage range of LA8509 is from 4.5V to 18V, and available in adjustable output voltage from 0.925V to 12V. The supply current is only 1.2mA during operation and under 1uA in shutdown. This device provides an enable function that can be controlled by external logic signal. It also provides excellent regulation during line or load transient due to the current mode operation. Other features of current limit, soft-start, thermal shutdown protection, and short circuit protection are also included. Due to the low RDS(ON) of the internal power MOSFET, this device provides high efficiency step-down applications. It is available in SOP-8 package. l Continuous 3A Output Capability l 0.925V Reference Voltage l 4.5V to 18V Input Voltage Range l Adjustable Output from 0.925V to 12V l 380KHz Oscillation Frequency l 1uA Low Shutdown Current l 1.2mA Low Supply Current l Current Mode for Excellent Response l Support Low ESR Output Ceramic Capacitors l Internal Current Limit l Soft-Start l Short Circuit Protection l Thermal Shutdown Protection l SOP-8 Package l Meet RoHS Standard Applications l Broadband Communication Device l LCD TV / Monitor l Storage Device l Wireless Application Ordering Information Marking Information LA8509 1 2 3 4 1 (Package Type) => P: ESOP 2 (Number of Pins) => G: 8pin 3 (Output Voltage) => Blank: Adjustable 4 (Special Feature) => Blank: N/A Available Part Number LA8509PG LA8509PG 1234 1 2 (Date Code) For date code rule, please contact our sales representative directly 3 4 (Internal Code) LA8509-A01 -1- May 29, 2011 www.linear-artwork.com Typical Application 10nF 7V~18V 10uF MLCC 0.1uF IN 2 EN 7 1 BS SW LA8509 SS 15uH 3 0.1uF 8 COMP 6 15K GND FB 5 44.2K NC 3.3nF 4 10K LA8509 5V 10uF 10uF MLCC MLCC 10nF 4.5V~18V 10uF MLCC 0.1uF IN 2 EN 7 1 BS SW LA8509 SS 4.7uH 3 0.1uF 8 3.3K COMP 6 GND FB 5 2K NC 6.8nF 4 6.8K 1.2V 10uF 10uF MLCC MLCC LA8509-A01 -2- May 29, 2011 www.linear-artwork.com LA8509 Quick Design Table (1). Voltage Divider and Inductor Selection Table (IOUT = 3A, △IL = 0.6A) L1: Recommended Inductor R1: Output Voltage Divider R2: Output Voltage Divider 1 10nF VIN IN 10uF 0.1uF 2 BS SW 3 EN LA8509 7 COMP FB CC2 6 RC1 GND 5 CC1 4 L1 R1 R2 VOUT COUT VIN VOUT 5V 9V 12V 1.2V 1.8V L1 : 4.7uH R1 : 2KOhm R2 : 6.8KOhm L1 : 4.7uH R1 : 3KOhm R2 : 3.2KOhm L1 : 4.7uH R1 : 2KOhm R2 : 6.8KOhm L1 : 6.8uH R1 : 3KOhm R2 : 3.2KOhm L1 : 4.7uH R1 : 2KOhm R2 : 6.8KOhm L1 : 6.8uH R1 : 3KOhm R2 : 3.2KOhm 2.5V 3.3V 5V 9V L1 : 6.8uH R1 : 5.1KOhm R2 : 3KOhm L1 : 6.8uH R1 : 5.1KOhm R2 : 3KOhm L1 : 10uH R1 : 5.1KOhm R2 : 3KOhm L1 : 4.7uH R1 : 10KOhm R2 : 3.9KOhm L1 : 10uH R1 : 10KOhm R2 : 3.9KOhm L1 : 10uH R1 : 10KOhm R2 : 3.9KOhm L1 : 10uH R1 : 44.2KOhm R2 : 10KOhm L1 : 15uH R1 : 44.2KOhm R2 : 10KOhm L1 : 15uH R1 : 59KOhm R2 : 6.8KOhm (2). Output Capacitor and Compensation Component Selection Table RC1: Compensation Resistor CC1: 1’st Compensation Capacitor CC2: 2’nd Compensation Capacitor COUT VOUT 1.2V 22uF ESR ≈ 5mΩ ( MLCC) RC1 : 1.8KOhm CC1 : 6.8nF CC2 : NC 47uF ESR ≈ 5mΩ ( MLCC) RC1 : 3.3KOhm CC1 : 6.8nF CC2 : NC 47uF ESR ≈ 15mΩ (SMD Polymer) RC1 : 3.3KOhm CC1 : 4.7nF CC2 : NC 330uF ESR ≈ 300mΩ (Std. AL. E-Cap) RC1 : 22KOhm CC1 : 2.2nF CC2 : 3.9nF 330uF RC1 : 27KOhm ESR ≈ 50mΩ CC1 : 2.2nF ( Low ESR E-Cap) CC2 : 680pF 1.8V RC1 : 2.5KOhm CC1 : 6.8nF CC2 : NC RC1 : 5.1KOhm CC1 : 4.7nF CC2 : NC RC1 : 5.1KOhm CC1 : 3.3nF CC2 : NC RC1 : 33KOhm CC1 : 2.2nF CC2 : 2.2nF RC1 : 39KOhm CC1 : 2.2nF CC2 : 470pF 2.5V RC1 : 3.3KOhm CC1 : 6.8nF CC2 : NC RC1 : 7.9KOhm CC1 : 3.3nF CC2 : NC RC1 : 6.8KOhm CC1 : 3.3nF CC2 : NC RC1 : 51KOhm CC1 : 2.2nF CC2 : 1.8nF RC1 : 51KOhm CC1 : 1nF CC2 : 330pF 3.3V RC1 : 4.7KOhm CC1 : 6.8nF CC2 : NC RC1 : 10KOhm CC1 : 3.3nF CC2 : NC RC1 : 10KOhm CC1 : 2.2nF CC2 : NC RC1 : 68KOhm CC1 : 2.2nF CC2 : 1.2nF RC1 : 68KOhm CC1 : 1nF CC2 : 220pF 5V 9V RC1 : 6.8KOhm CC1 : 6.8nF CC2 : NC RC1 : 12KOhm CC1 : 6.8nF CC2 : NC RC1 : 15KOhm CC1 : 3.3nF CC2 : NC RC1 : 25KOhm CC1 : 3.3nF CC2 : NC RC1 : 15KOhm CC1 : 2.2nF CC2 : NC RC1 : 27KOhm CC1 : 1nF CC2 : NC RC1 : 100KOhm CC1 : 2.2nF CC2 : 820pF RC1 : 180KOhm CC1 : 1nF CC2 : 390pF RC1 : 100KOhm CC1 : 470pF CC2 : 120pF RC1 : 180KOhm CC1 : 470pF CC2 : 82pF LA8509-A01 -3- May 29, 2011 www.linear-artwork.com Functional Block Diagram LA8509 1 .1 V FB 1 .3 V SS 0 .9 2 5 V COMP EN 7V Zener 2.5V 1.5V OVP RAMP OSC CLK ERROR AM PLIFIER 6uA EN OK LOCKOUT C OM PARATO R SHUTDOW N C OM PARATO R CURRENT SENSE A M P LIF IE R SQ RQ CURRENT COMPARATOR IN 5V BS SW 1.2V OVP IN<4.10V IN IN T E R N A L R EGU LATO R S GND Pin Configurations BS IN SW GND EXPOSED PAD TIE TO GROUND.


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