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PWM Controller. RT8110 Datasheet

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PWM Controller. RT8110 Datasheet






RT8110 Controller. Datasheet pdf. Equivalent




RT8110 Controller. Datasheet pdf. Equivalent





Part

RT8110

Description

Compact Synchronous Buck DC/DC PWM Controller



Feature


RT8110 Compact Synchronous Buck DC/DC PW M Controller General Description The RT 8110 is a compact fixed-frequency PWM c ontroller with integrated MOSFET driver s for single-phase synchronous buck con verter. This part features wide input v oltage range operation and tiny package . An internal preregulator drives an ex ternal BJT to provide regulated output voltage from the i.
Manufacture

RICHTEK

Datasheet
Download RT8110 Datasheet


RICHTEK RT8110

RT8110; nput voltage to support VCC. Therefore, the controller can operate with wide in put voltage range. The RT8110 utilizes voltage-mode control with internal comp ensation to simplify the converter desi gn. An internal 0.8V reference voltage allows low output voltage application. The switching frequency is fixed at 400 kHz to reduce the external passive comp onent size to save.


RICHTEK RT8110

board space. Low-side MOSFET RDS(ON) is used for inductor current sensing. The RT8110 provides under voltage protecti on, current limit, over current protect ion and over temperature protection. F eatures z z z z z z z z z z z z 8V to 23V Wide Range Operation 0.8V Internal Reference Internal Soft Start High DC G ain Voltage Mode PWM Control Fixed 400k Hz Switching Frequ.


RICHTEK RT8110

ency Fast Transient Response Fully Dynam ic 0 to 80% Duty Cycle Over Current Pro tection Under Voltage Protection Over T emperature Protection Tiny Package TSOT -23-8 RoHS Compliant and 100% Lead (Pb) -Free Applications z z z Ordering Inf ormation RT8110 Package Type J8 : TSOT- 23-8 Operating Temperature Range P : Pb Free with Commercial Standard G : Gree n (Halogen Free wi.

Part

RT8110

Description

Compact Synchronous Buck DC/DC PWM Controller



Feature


RT8110 Compact Synchronous Buck DC/DC PW M Controller General Description The RT 8110 is a compact fixed-frequency PWM c ontroller with integrated MOSFET driver s for single-phase synchronous buck con verter. This part features wide input v oltage range operation and tiny package . An internal preregulator drives an ex ternal BJT to provide regulated output voltage from the i.
Manufacture

RICHTEK

Datasheet
Download RT8110 Datasheet




 RT8110
RT8110
Compact Synchronous Buck DC/DC PWM Controller
General Description
The RT8110 is a compact fixed-frequency PWM controller
with integrated MOSFET drivers for single-phase
synchronous buck converter. This part features wide input
voltage range operation and tiny package. An internal pre-
regulator drives an external BJT to provide regulated output
voltage from the input voltage to support VCC. Therefore,
the controller can operate with wide input voltage range.
The RT8110 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 400kHz
to reduce the external passive component size to save
board space. Low-side MOSFET RDS(ON) is used for
inductor current sensing. The RT8110 provides under
voltage protection, current limit, over current protection
and over temperature protection.
Ordering Information
RT8110
Package Type
J8 : TSOT-23-8
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
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.
Features
z 8V to 23V Wide Range Operation
z 0.8V Internal Reference
z Internal Soft Start
z High DC Gain Voltage Mode PWM Control
z Fixed 400kHz Switching Frequency
z Fast Transient Response
z Fully Dynamic 0 to 80% Duty Cycle
z Over Current Protection
z Under Voltage Protection
z Over Temperature Protection
z Tiny Package TSOT-23-8
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Set-top Box Power Supplies
z PC Subsystem Power Supplies
z Cable Modems, DSL Modems
z DSP and Core Communication Processor Power
Supplies
z Memory Power Supplies
z Personal Computer Peripherals
z Industrial Power Supplies
z Low Voltage Distributed Power Supplies
Pin Configurations
(TOP VIEW)
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area, otherwise visit our website for detail.
87 6 5
2 34
TSOT-23-8
DS8110-00 May 2009
www.richtek.com
1
Free Datasheet http://www.datasheet4u.com/




 RT8110
RT8110
Typical Application Circuit
VIN
8V to 23V
DBOOT
R
CVCC
Shutdown
Q2
RT8110
2 DRIVE BOOT 1
4 VCC
UGATE 7
PHASE 8
3 FB
LGATE 5
GND 6
R1
R2
C3 R3
CBOOT
CIN
MU
L1
ML
COUT
Figure 1. Single Input Power Rail Application
DBOOT
RX
5V
CVCC
Shutdown
Q1
RT8110
2 DRIVE BOOT 1
UGATE 7
4 VCC
PHASE 8
3 FB
LGATE 5
GND 6
R1
VIN
5V to 23V
CBOOT
CIN
MU
L1
ML
COUT
R2
C3 R3
Figure 2. Split Input Power Rail Application
www.richtek.com
2
DS8110-00 May 2009
Free Datasheet http://www.datasheet4u.com/




 RT8110
RT8110
Functional Pin Description
Pin No. Pin Name
Pin Function
1 BOOT
This pin provides power to the high-side MOSFET gate driver. Use bootstrap circuit to drive
the high-side MOSFET.
Pre-regulator Control Pin. Connect this pin to the base of external BJT, and connect the
collector to VIN to obtain a regulated output voltage to support VCC. If VCC is directly
2 DRIVE supplied, the BJT is not required, and this pin should be pulled high to VCC through a
resistor. DRIVE pin can also be used for enable control. Pull low this pin to GND can
shutdown the controller.
3 FB
Inverting Input of the Error Amplifier. This pin is connected to the joint of output voltage
divider resistors to set the output voltage. The voltage at this pin is also monitored for under
voltage protection.
4 VCC
Main Bias Supply of the IC. VCC can be directly supplied or by VIN through external BJT
driven by DRIVE pin. This pin also provides power for the low-side MOSFET gate driver.
Connect ceramic capacitor to this pin. The voltage at this pin is monitored for power on
reset (POR).
5 LGATE Gate Drive Pin for Low-Side MOSFET.
6 GND
Signal and Power Ground of the IC. All voltage levels are referenced with respect to this pin.
7 UGATE Gate Drive Pin for High-Side MOSFET.
8
PHASE
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.
Function Block Diagram
DRIVE VCC
VCC
0.8VREF
SS
VCC
Pre-Regulator
Power-
On Reset
POR
0.5V
UVP
-
+
Soft-Start
and Fault
Logic
S1L
IOC
OC
+
-
-
+
PH_M
ROC
1.5V
FB
++Gm EO
-
+
Gate
Control
-
PWM
Logic
VCC
Oscillator
PHASE
UGATE
BOOT
LGATE
GND
DS8110-00 May 2009
www.richtek.com
3
Free Datasheet http://www.datasheet4u.com/






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