L6910G ADJUSTABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION Figure 1. Packages 1 FEATURES OPERATING SUPPLY VOLTAGE FROM 5V TO 12V BUSES UP TO 1.3A GATE CURRENT CAPABILITY ADJUSTABLE OUTPUT VOLTAGE SO-16 (Narrow) N-INVERTING E/A INPUT AVAILABLE 0.9V 1.5% VOLTAGE REFERENCE Table 1. Order Codes VOLTAGE MODE PWM CONTROL Part Number Package VERY FAST LOAD TRANSIENT RESPONSE L6910G SO-16 0% TO 100% DUTY CYCLE POWER GOOD OUTPUT L6910GTR SO-16 in Tape & Reel OVERVOLTAGE PROTECTION HICCUP OVERCURRENT PROTECTION dc-dc conversion from 3.3V, 5V and 12V buses. 200kHz INTERNAL OSCILLATOR The output voltage is adjustable down to 0.9V OSCILLATOR EXTERNALLY ADJUSTABLE higher voltages can be obtained with an external FROM 50kHz TO 1MHz voltage divider. SOFT START AND INHIBIT PACKAGE: SO-16 High peak current gate drivers provide for fast switch- ing to the external power section, and the output current can be in excess of 20A. 2 APPLICATIONS The device assures protections against load overcur- SUPPLY FOR MEMORIES AND TERMI- rent and overvoltage. NATIONS COMPUTER ADD-ON CARDS An internal crowbar is also provided turning on the LOW VOLTAGE DISTRIBUTED DC-DC low side mosfet as long as the over-voltage is detect- MAG-AMP REPLACEMENT ed. In case of over-current detection, the soft start ca- pacitor is discharged and the system works in HICCUP mode. 3 DESCRIPTION The device is a pwm controller for high performance Figure 2. Block Diagram V 5V to 12V in VCC OCSET PGOOD MONITOR PROTECTION BOOT VREF & REF SS UGATE V OSC PHASE O OSC R T PWM E/A - LGATE EAREF + + - PGND GND VFB COMP D03IN1509 Rev. 1 May 2005 1/26 300KL6910G Table 2. Absolute Maximum Ratings Symbol Parameter Value Unit Vcc Vcc to GND, PGND 15 V V -V Boot Voltage 15 V BOOT PHASE V -V 15 V HGATE PHASE OCSET, LGATE, PHASE -0.3 to Vcc+0.3 V SS, FB, PGOOD, VREF, EAREF, RT 7 V COMP 6.5 V T Junction Temperature Range -40 to 150 C j T Storage temperature range -40 to 150 C stg P Maximum power dissipation at Tamb = 25C1 W tot OCSET PIN Maximum Withstanding Voltage Range 1000 V Test Condition: CDF-AEC-Q100-002Human Body Model OTHER PINS 2000 V Acceptance Criteria: Normal Performance Table 3. Thermal Data Symbol Parameter Value Unit R Thermal Resistance Junction to Ambient 120 C/W th j-amb (*) Device soldered on 1 S2P PC board Figure 3. Pins Connection (Top view) VREF 1 16 N.C. OSC 2 15 VCC OCSET 3 14 LGATE SS/INH 4 13 PGND COMP 5 12 BOOT FB 6 11 HGATE GND 7 10 PHASE EAREF 8 9 PGOOD D03IN1510 2/26