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TPS54386-TPS54386PWPR-TPS54386PWPRG4
4.5V to 28V Input, Dual 3A Outputs, 600kHz Step-Down Converter with Internal Compensation
PVDD2
BOOT2
SW2
PVDD1
BOOT1
SW1
GND
TPS54383
ILIM2
EN2
FB1
OUTPUT1 OUTPUT2
VIN
UDG-07123
GND
Features 3 DescriptionThe TPS54383 and TPS54386 4.5-Vto 28-V Input Range synchronous buck converters• Output Voltage Range 0.8Vto 90%of Input 3-A output applications that operateVoltage 28-V input supply voltage, Output Current Upto3A voltages between 0.8V and 90% Two Fixed Switching Frequency Versions: With an internally-determined
soft-start time, and control loop– TPS54383: 300 kHz
converters provide many features– TPS54386: 600 kHz external components. Channel• Three Selectable Levelsof Overcurrent Protection protectionis setat 4.5A, while(Output2) protection levelis selected by 0.8-V 1.5% Voltage Reference ground,to BP,or left floating.
usedto allow for scalingof external for• 2.1-ms Internal Soft-Start applications thatdo not need theof• Dual PWM Outputs 180° Out-of-Phase both outputs.• Ratiometricor Sequential Startup Modes The outputs may be enabledSelectablebya Single Pin be configuredto allow either ratio-metric• 85-mΩ Internal High-Side MOSFETs startup sequencing. Additionally, Current Mode Control Internal Compensation (See Page 16) Pulse-by-Pulse Overcurrent Protection• Thermal Shutdown Protectionat +148°C• 14-Pin PowerPAD™ HTSSOP package
2 Applications Set Top Box Digital TV Powerfor DSP Consumer Electronics
Simplified Schematic
