PWM Controller. RP6104 Datasheet
Wide Input Range Synchronous Buck DC/DC PWM
The RP6104 is a fixed-frequency PWM controller with
integrated MOSFET drivers for single power rail
synchronous single-phase buck converter. This part
features an internal regulator that allows wide input voltage
range operation. The RP6104 utilizes voltage-mode control
with internal compensation to simplify the converter
design. An internal 0.8V reference voltage allows low
output voltage application. The switching frequency is fixed
at 600kHz to reduce the external passive component size
to save board space. The RP6104 provides under voltage
protection, current limit, over current protection and over
temperature protection. The low-side MOSFET RDS(ON) is
used to sense the inductor current for over current
SP : SOP-8 (Exposed Pad-Option 1)
Operating Temperature Range
G : Green (Halogen Free with Commer-
10V to 23V Wide Input Voltage Range
0.8V Internal Reference
Internal Soft Start
High DC Gain Voltage Mode PWM Control
Fixed 600kHz Switching Frequency
Fast Transient Response
Fully Dynamic 0 to 80% Duty Cycle
Over Current Protection
Under Voltage Protection
Over Temperature Protection
Set-top Box Power Supplies
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Cable Modems, DSL Modems
DSP and Core Communication Processor Power
Memory Power Supplies
Personal Computer Peripherals
Industrial Power Supplies
Low Voltage Distributed Power Supplies
Richpower Green products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
SOP-8 (Exposed Pad)
RP6104-01P Jan 2010
Typical Application Circuit
C1 UGATE 2
GND 3, Exposed Pad (9)
Functional Pin Description
Switching Node of the Buck Converter. This pin is also used to monitor the voltage
drop across the low-side MOSFET for over current protection.
UGATE Gate Drive Pin for High-Side MOSFET.
9 (Exposed Pad)
Signal and Power Ground of the IC. All voltage levels are referenced with respect
to this pin. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
4 LGATE Gate Drive Pin for Low-Side MOSFET.
Internal Regulator Output Pin, typically 5.5V. VIN is regulated to VCC by the
internal regulator. VCC is the main bias supply of the IC. This pin also provides
power for the low-side MOSFET gate driver. Connect a ceramic capacitor to this
pin. The voltage at this pin is monitored for power on reset (POR).
Inverting Input of the Error Amplifier. This pin is connected to the joint of output
6 FB voltage divider resistors to set the output voltage. The voltage at this pin is also
monitored for under voltage protection.
This pin is internally connected to the collector of integrated BJT, which is designed
to withstand 23V to provide a regulated 5.5V voltage to VCC pin.
This pin provides power to the high-side MOSFET gate driver. A bootstrap circuit is
used to drive the high-side MOSFET.
2 RP6104-01P Jan 2010
Function Block Diagram
RP6104-01P Jan 2010