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Single-Phase Synchronous Buck PWM Controller

RT8120

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The RT8120 is a single-phase synchronous buck PWM DC/DC controller designed to drive two N-MOSFET. It provides a highly accurate, programmable output voltage precisely regulated to low voltage requirements with an internal 0.8V ±1% ( option for 0.6V ±1.5%) reference. The RT8120 uses a single feedback loop voltage mode PWM control for fast transient response. An oscillator with fixed frequency 300kHz reduces the external inductor and capacitor component size for saving PCB board area. The RT8120 provides fast transient response to satisfy high current output applications while minimizing external components. It is suitable for high performance graphic processors, DDR and VTT power. The RT8120 incorporates an externally compensated error amplifier and an internal soft-start and output enable. The RT8120 comes in SOP-8 and SOP-8 (Exposed Pad) packages.

Applications

  • System (Graphic, MB) with 5V or 12V Power
  • Graphic Cards (AGP 8X, 4X, PCI Express*16)
  • 3.3V to 12V Input DC/DC Regulators
  • Low Voltage Distributed Power Supplies
  • Motherboard
Key Spec.
RT8120A RT8120B RT8120C RT8120D
Status NRND NRND NRND NRND
Recommended Alternative  RT8120E/RT8120F,RT8120E/RT8120F,RT8120E/RT8120F,RT8120E/RT8120F RT8120E/RT8120F,RT8120E/RT8120F,RT8120E/RT8120F,RT8120E/RT8120F RT8120E/RT8120F,RT8120E/RT8120F,RT8120E/RT8120F,RT8120E/RT8120F RT8120E/RT8120F,RT8120E/RT8120F,RT8120E/RT8120F,RT8120E/RT8120F
Vs (typ) (V) 12;5 12;5 12;5 12;5
Vin (min) (V) 3 3 3 3
Vin (max) (V) 13.2 13.2 13.2 13.2
Vout (min) (V) 0.6 0.6 0.6 0.6
Vout (max) (V) 5 5 5 5
Preset Vout (V)
Output Adj. Method Resistor Resistor Resistor Resistor
Accuracy (+/- %) 1 1 1 1
Freq (typ) (kHz) 300 300 300 300
Freq (min) (kHz)
Freq (max) (kHz)
Iq (typ) (mA) 1.5 1.5 1.5 1.5
Ext Sync No No No No
Features Built-in Bootstrap Switch;Force PWM;OCP;SCP;UVP;Voltage Mode Control Built-in Bootstrap Switch;Force PWM;OCP;SCP;UVP;Voltage Mode Control Built-in Bootstrap Switch;Force PWM;OCP;SCP;UVP;Voltage Mode Control Built-in Bootstrap Switch;Force PWM;OCP;SCP;UVP;Voltage Mode Control
Package Type SOP-8;PSOP-8 SOP-8;PSOP-8 SOP-8;PSOP-8 SOP-8;PSOP-8
Features
  • Wide Input Voltage Range : 3V to 13.2V
  • Embedded Switching Boot Diode
  • 0.8V ±1%, 0.6V ±1.5% Internal Reference
  • Shoot-Through Protection and Short Pulse Free Technology for Gate Drivers
  • Fixed Frequency 300kHz
  • Internal Soft-Start
  • Over Current Protection by Sensing MOSFET RDS(ON)
  • Enable/Shutdown Control
  • Drives Two N-MOSFETs
  • Full Duty Cycle : 0% to 85%
  • Fast Transient Response
  • Voltage Mode PWM Control with External Feedback Loop Compensation
  • Pinless LGATE Over Current Setting (LGOCS)
  • Under Voltage Protection
  • SOP-8 and SOP-8 (Exposed Pad) Packages
  • RoHS Compliant and Halogen Free
Reliability
Title Last Update ShareDownload
Single-Phase Synchronous Buck PWM Controller 2015/05/19
Technical Documents
TitleLast UpdateShareDownload
Analysis of Buck Converter Efficiency2016/06/21
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT8120AGSPPSOP-82500 Not available Buy from Distributor
RT8120BGSPPSOP-82500 Not available Buy from Distributor
RT8120DGSPPSOP-82500 Not available Buy from Distributor
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