Dual 1A/1.5A-1.2MHz Synchronous Step-Down Converters


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The RT8012A is a dual PWM, current mode, stepdown converter. Its input voltage range is from 2.6V to 5.5V and has a constant 1.2MHz switching frequency, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. Each output voltage is adjustable from 0.8V to 5V. Internal power switches with low on-resistance of the dual step-down regulators increase efficiency and eliminate the need for external Schottky diodes. The RT8012A can run at 100% duty cycle for low dropout operation that extends battery life in portable systems. With independent Enable and Power-Good pins, it is easy to control the power up sequence of the two converters, which is important in some applications.


  • Portable Instruments
  • Microprocessors and DSP Core Supplies
  • Cellular Phones
  • Wireless and DSL Modems
  • PC Cards
  • Digital Cameras
Key Spec.
Status Active
Vin (min) (V) 2.6
Vin (max) (V) 5.5
Number of Outputs 2
Vout (min) (V) 0.8
Vout (max) (V) 5
Output Adj. Method Resistor
Iout (max) (A) 1;1.5
Current Limit (typ) (A) 1.6;2.2
Freq (typ) (kHz) 1200
Ext Sync No
Ron_HS (typ) (mOhm) 180;300
Ron_LS (typ) (mOhm) 260;90
Iq (typ) (mA) 0.83
Features 100% Duty Cycle;Current Mode Control;Enable Input;Force PWM;Internal Compensation;OCP;Power Good;Stable with Ceramic Capacitor;UVP
Package Type WQFN4x4-16
  • High Efficiency : Up to 95%
  • 1.2MHZ Constant Switching Frequency
  • 1A and 1.5A Load Current on Each Channel Respectively
  • Low RDS(ON) Internal Switches
  • No Schottky Diode Required
  • 0.8V Reference Allows Low Output Voltage
  • Low Dropout Operation : 100% Duty Cycle
  • Internally Compensated
  • < 2μA Shutdown Current
  • Power Good Output Voltage Monitor
  • Internal Soft-Start
  • Easy Power Sequence Control
  • Over temperature Protection
  • Short Circuit Protection
  • Thermally Enhanced 16-Lead WQFN Package
  • RoHS Compliant and 100% Lead (Pb)-Free
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