Datasheet LTC3119 (Analog Devices) - 11

LTC3119
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Maximum Output Current Burst Mode Operation Load Step Burst Mode Operation VOUT = 12V 400mA to 4A, VIN = 9V IN VOUT Ripple OUT
8.0 PULSED LOAD FRONT PAGE APPLICATION FRONT PAGE APPLICATION 7.0 CONTINUOUS LOAD I V LOAD = 50mA, VIN = 9V OUT 200mV/DIV OUTPUT 6.0 VOLTAGE 5.0 20mV/DIV INDUCTOR CURRENT 4.0 5A/DIV INDUCTOR 3.0 LOAD CURRENT CURRENT 250mA/DIV DC2129A DEMO BOARD OUTPUT CURRENT (A) 2.0 5A/DIV fSW = 750kHz 100Hz PULSE LOAD 200µs/DIV 3119 G46 20µs/DIV 3119 G47 1.0 20% DUTY CYCLE STANDBY LOAD = 0.25A 0 2 4 6 8 10 12 14 16 18 INPUT VOLTAGE (V) 3119 G52
PWM Mode Load Step 400mA to Switching Waveforms, Buck Switching Waveforms, Boost 4A, VIN = 9V IN Mode Operation Mode Operation
FRONT PAGE APPLICATION FRONT PAGE APPLICATION FRONT PAGE APPLICATION ILOAD = 2A, VIN = 9V ILOAD = 2A, VIN = 3V VOUT SW1 SW1 200mV/DIV 10V/DIV 5V/DIV INDUCTOR SW2 SW2 CURRENT 5V/DIV 5V/DIV 5A/DIV INDUCTOR INDUCTOR LOAD CURRENT CURRENT CURRENT 1A/DIV 400mA/DIV 5A/DIV 200µs/DIV 3119 G48 500ns/DIV 3119 G49 500ns/DIV 3119 G50
pin FuncTions (QFN/TSSOP) PGND (Pins 1, 6, 17, 22, Exposed Pad Pin 29/Pins 4, 9, PVOUT (Pins 3, 4/Pins 6, 7):
Output Voltage Power
20, 25, Exposed Pad Pin 29):
Power Ground Connection. Connection. These pins is connected to switch D of the These pins should be connected to the power ground buck-boost converter. Connect a low ESR 10µF or larger using the shortest and widest connections possible. The capacitor between this pin and ground using the lowest exposed pad must be soldered to the PCB and electrically impedance path possible. connected to ground through the shortest and lowest
PGOOD (Pin 7/Pin 10):
Open drain output that pulls to impedance path possible and to the PCB ground plane ground when FB drops too far below its regulated volt- for rated thermal performance. age. Connect a pull-up resistor from this pin to a positive
SW2 (Pins 2, 5/Pins 5, 8):
Buck-Boost Converter Power supply. Refer to the Operation section of the data sheet Switch Pin. These pins should be connected to one side for more detail. of the Buck-Boost inductor.
SVCC (Pin 8/Pin 11):
Supplies voltage to internal circuits used for production test. This pin must be tied to VCC. 3119fb For more information www.linear.com/LTC3119 11 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Introduction PWM Mode Operation VCC Regulator Current Mode Control Error Amplifiers Current Limit and Zero Current Detection Soft-Start Maximum Power Point Control (MPPC) Burst Mode Operation Power Good Indicator Thermal Considerations Applications Information Typical Applications Package Description Revision History Typical Application Related Parts