DC-DC Controller. RP6101 Datasheet

RP6101 Controller. Datasheet pdf. Equivalent

RP6101 Datasheet
Recommendation RP6101 Datasheet
Part RP6101
Description 5V/12V Synchronous Buck PWM DC-DC Controller
Feature RP6101; Preliminary RP6101 5V/12V Synchronous Buck PWM DC-DC Controller General Description The RP6101 is.
Manufacture RICHPOWER
Datasheet
Download RP6101 Datasheet




RICHPOWER RP6101
Preliminary
RP6101
5V/12V Synchronous Buck PWM DC-DC Controller
General Description
The RP6101 is a high efficiency synchronous buck PWM
controllers that generate logic-supply voltages in PC based
systems. These high performance , single output devices
include internal soft-start, frequency compensation
networks and integrates all of the control, output
adjustment, monitoring and protection functions into a
single package.
The device operating at fixed 300kHz frequency provides
an optimum compromise between efficiency, external
component size, and cost.
Adjustable over-current protection (OCP) monitors the
voltage drop across the RDS(ON) of the lower MOSFET for
synchronous buck PWM DC-DC controller. The over-
current function cycles the soft-start in 4-times hiccup
mode to provide fault protection, and in an always hiccup
mode for under-voltage protection.
Ordering Information
RP6101
Package Type
S : SOP-8
Operating Temperature Range
G : Green (Halogen Free with Commer-
cial Standard)
Features
z Operating with 5V or 12V Supply Voltage
z Drives All Low Cost N-MOSFETs
z Voltage Mode PWM Control
z 300kHz Fixed Frequency Oscillator
z Fast Transient Response :
` High-Speed GM Amplifier
` Full 0 to 100% Duty Ratio
z Internal Soft-Start
z Adaptive Non-Overlapping Gate Driver
z Over-Current Fault Monitor on MOSFET, No Current
Sense Resistor Required
z Full-Time Over Voltage Protection
z RoHS Compliant and Halogen Free
Applications
z Graphic Card
z Motherboard, Desktop Servers
z IA Equipments
z Telecomm Equipments
z High Power DC-DC Regulators
Pin Configurations
(TOP VIEW)
Note :
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.
BOOT
UGATE
GND
LGATE
2
3
4
8 PHASE
7 OPS
6 FB
5 VCC
SOP-8
RP6101-00P May 2009
1



RICHPOWER RP6101
RP6101
Preliminary
Typical Application Circuit
+5V to +12V D1
BAT54
RBOOT
0
R1
10
C1
1uF
1 BOOT
5 VCC
UGATE 2
PHASE 8
6 FB
RP6101
OPS
7
3 GND
LGATE 4
C2
0.1uF
RUGATE
0
ROCSET
Disable >
Q3
3904
R2 R3
32 68
VIN
+3.3V/+5V/+12V
C3 C4
1uF 470uF
Q1
MU
L1
3uH
VOUT
Q2 R
ML C
C6 to C8
1000uFx3
VOUT
=
VREF
× (1+
R3
R2
)
VREF : Internal reference voltage
(0.8V ± 2%)
R4 C5
200 to 1k 0.1 to 0.33uF
Functional Pin Description
BOOT (Pin 1)
Bootstrap supply pin for the upper gate driver. Connect
the bootstrap capacitor between BOOT pin and the PHASE
pin. The bootstrap capacitor provides the charge to turn
on the upper MOSFET.
UGATE (Pin 2)
Upper gate driver output. Connect to the gate of high-
side power N-Channel MOSFET. This pin is monitored by
the adaptive shoot-through protection circuitry to
determine when the upper MOSFET has turned off.
GND (Pin 3)
Both signal and power ground for the IC. All voltage levels
are measured with respect to this pin. Ties the pin directly
to the low-side MOSFET source and ground plane with
the lowest impedance.
LGATE (Pin 4)
Lower gate drive output. Connect to the gate of low-side
power N-Channel MOSFET. This pin is monitored by the
adaptive shoot-through protection circuitry to determine
when the lower MOSFET has turned off.
2
VCC (Pin 5)
Connect this pin to a well-decoupled 5V or 12V bias
supply. It is also the positive supply for the lower gate
driver, LGATE.
FB (Pin 6)
Switcher feedback voltage. This pin is the inverting input
of the error amplifier. FB senses the switcher output
through an external resistor divider network.
OPS (OCSET, POR and Shut-Down) (Pin 7)
This pin provides multi-function of the over-current setting,
UGATE turn-on POR sensing, and shut-down features.
Connecting a resistor (ROCSET) between OPS and PHASE
pins sets the over-current trip point.
Pulling the pin to ground resets the device and all external
MOSFETs are turned off allowing the output voltage power
rails to float.
This pin is also used to detect VIN in power on stage and
issues an internal POR signal.
PHASE (Pin 8)
Connect this pin to the source of the upper MOSFET and
the drain of the lower MOSFET.
RP6101-00P May 2009



RICHPOWER RP6101
Function Block Diagram
Preliminary
VCC
Bias & Regulators
(3V_Logic & 3VDD_Analog)
Reference
0.8VREF
Power On
Reset
0.6V
UV_S
Soft-Start
&
Fault Logic
1V
1.3V
OVP
GM EO
FB
Oscillator
(300kHz)
RP6101
EN
PH_M
0.1V
1.5V
3V
IOC 40uA
OC - 0.4V
+
+
-
VOC
Gate
Control
Logic
VCC
OPS
BOOT
UGATE
PHASE
LGATE
GND
RP6101-00P May 2009
3







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