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  Richtek Technology Electronic Components Datasheet  

RT8101 Datasheet

12V Synchronous Buck PWM DC-DC

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RT8101 pdf
Preliminary
RT8101/A
12V Synchronous Buck PWM DC-DC
General Description
The RT8101/A are DC/DC synchronous buck PWM
controllers with embedded driver support up to 12V+12V
boot-strapped voltage for high efficiency power driving. The
parts are with full functions of voltage regulation, power
monitoring and protection into a single small footprint
www.DataShpeaect4kUa.gceoms SOP-8 and SOP-8 (Exposed Pad).
The RT8101/Aapply a high-gain voltage mode PWM control
for simple application design. An internal 0.8V reference
allows the output voltage to be precisely regulated to low
voltage requirement. The parts are proposed with two type
including RT8101 and RT8101A with fixed operating
frequency of 300kHz and 600kHz respectively. Based on
the features that RT8101/A offered, the parts provide an
optimum solution between efficiency, total B.O.M. count,
and cost.
Ordering Information
RT8101/A
Package Type
S : SOP-8
SP : SOP-8 (Exposed Pad)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
600kHz
300kHz
Note :
RichTek Pb-free and 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.
`100% matte tin (Sn) plating.
Features
z Single 12V Bias Supply
z Drives All Low Cost N-MOSFETs
z High-Gain Voltage Model PWM Control
z 300kHz/600kHz Fixed Frequency Oscillator
z Fast Transient Response :
`High-Speed GM Amplifier
`Full 0 to 100% Duty Ratio
`External Compensation in the Control Loop
z Internal Soft-Start
z Adaptive Non-Overlapping Gate Driver
z Over-Current Fault Monitor on MOSFET, No
Current Sense Resistor Required
z RoHS Compliant and 100% Lead (Pb)-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)
BOOT
UGATE
GND
LGATE
2
3
4
8 PHASE
7 COMP
6 FB
5 VCC
SOP-8
BOOT
UGATE
GND
LGATE
8
27
GND
36
45
PHASE
COMP
FB
VCC
SOP-8(Exposed Pad)
DS8101/A-01 March 2007
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8101 Datasheet

12V Synchronous Buck PWM DC-DC

No Preview Available !

RT8101 pdf
RT8101/A
Typical Application Circuit
Preliminary
12V
RBOOT
VIN(+3.3V/+5V/+12V)
www.DataSheet4U.com
RT8101/A
1 BOOT UGATE 2
5 VCC
8
PHASE
6 FB
LGATE 4
3 GND
COMP 7
RUGATE
Q1
CIN
LOUT
Q2 R
C
VOUT
COUT
PSC
Functional Pin Description
BOOT (Pin 1)
Bootstrap supply 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 gate of the high-
side power N-Channel MOSFET. This pin is monitored by
the adaptive shoot-through protection circuitry to
determine when the upper MOSFET is turned off.
GND (Pin 3)
Signal ground for the IC.
LGATE (Pin 4)
Lower gate driver output. Connect to the gate of the low-
side power N-Channel MOSFET. This pin is monitored by
the adaptive shoot-through protection circuitry to determine
when the lower MOSFET is turned off.
VCC (Pin 5)
Connect this pin to a well-decoupled 12V bias supply. It
is also the positive supply for the lower gate driver, LGATE.
FB (Pin 6)
Buck converter feedback voltage. This pin is the inverting
input of the error amplifier. FB senses the switcher output
through an external resistor divider network.
COMP (Pin 7)
Buck converter external compensation. This pin is used
to compensate the control loop of the buck converter.
PHASE (Pin 8)
Connect this pin to the source of the upper MOSFET and
the drain of the lower MOSFET. This pin is monitored by
the adaptive shoot-through protection circuitry to
determine when the upper MOSFET is turned off.
Exposed Pad
Exposed pad should be soldered to PCB board and
connected to GND.
www.richtek.com
2
DS8101/A-01 March 2007


Part Number RT8101
Description 12V Synchronous Buck PWM DC-DC
Maker Richtek Technology Corporation
Total Page 15 Pages
PDF Download
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