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TD6811B 데이터시트 PDF




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부품번호 TD6811B 기능
기능 1.5MHz 1.2A Synchronous Step-Down Regulator Dropout
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TD6811B 데이터시트, 핀배열, 회로
T  echcode®
DATASHEET
 
 
 
1.5MHz 1.2A Synchronous Step-Down Regulator Dropout TD6811B
General Description 
Features   
The TD6811B is a high efficiency monolithic
synchronous buck regulator using a constant frequency,
current mode architecture. The device is available in an
adjustable version and fixed output voltages of 1.5V and
1.8V. Supply current during operation is only 20mA and
drops to 1mA in shutdown. The 2.5V to 5.5V input
voltage range makes the TD6811B ideally suited for
single Li-Ion battery-powered applications. 100% duty
cycle provides low dropout operation, extending battery
life in portable systems.Automatic Burst Mode operation
increases efficiency at light loads, further extending
battery life.
Switching frequency is internally set at 1.5MHz, allowing
the use of small surface mount inductors and capacitors.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. Low
output voltages are easily supported with the 0.6V
feedback reference voltage. The TD6811B is available in
TSOT23-5 package.
z High Efficiency: Up to 96%
z High Efficiency at light
loads(Vin=5V,Vout=3.3V,Ilod=3mA η>82%)
z Very Low Quiescent Current: Only 20uA During
Operation
z 1.2A Output Current
z 2.5V to 5.5V Input Voltage Range
z 1.5MHz Constant Frequency Operation
z No Schottky Diode Required
z Low Dropout Operation: 100% Duty Cycle
z 0.6V Reference Allows Low Output Voltages
z Shutdown Mode Draws 1uA Supply Current
z Current Mode Operation for Excellent Line and Load
Transient Response
z Overtemperature Protected
z TSOT23-5   Package is Available
Applications 
  z Cellular Telephones
z Personal Information Appliances
z Wireless and DSL Modems
z Digital Still Cameras
z MP3 Players
z Portable Instruments
Package Types 
 
 
 
  
  TSOT235 
 
Figure 1. Package Types of TD6811B 
December,  20,  2009                                                        Techcode  Semiconductor  Limited                                                  www.techcodesemi.com 
1 




TD6811B pdf, 반도체, 판매, 대치품
T  echcode®
 
 
 
1.5MHz 1.2A Synchronous Step-Down Regulator Dropout
Absolute Maximum Ratings 
DATASHEET
TD6811B
Note1: Stresses greater than those listed under Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation
of the device at these or any other conditions above those indicated in the operation is not implied. Exposure to absolute maximum rating conditions for extended
periods may affect reliability.
Parameter
Value
Unit
Input Supply Voltage
-0.3 ~6
V
RUN, VFB Voltages
-0.3 ~ VIN
V
SW Voltage
-0.3V ~(VIN+0.3)
V
P-Channel Switch Source Current (DC)
1500
mA
N-Channel Switch Sink Current (DC)
1500
mA
Peak SW Sink and Source Current
1.8 A
Operating Temperature Range
-40~+85
ºC
Junction Temperature
125 ºC
Lead Temperature (Soldering, 10 sec) 300 ºC
Storage Temperature Range
-65~150
ºC
Electrical Characteristics 
Unless otherwise specified, VIN= 3.6V TA=25 ºC. 
Symbol
IVFB
VFB
 VFB
VOUT
 VOUT
Parameter
Conditions
Feedback Current
Regulated Feedback
Voltage
Reference Voltage Line
Regulation
Regulated Output
Voltage
Output Voltage Line
Regulation
TA = 25°C
0°C TA 85°C
–40°C TA 85°C
VIN = 2.5V to 5.5V
TD6811B-1.5,
100mA
TD6811B-1.8,
100mA
IOUT
IOUT
VIN = 2.5V to 5.5V
Min.
0.5880
0.5865
0.5850
= 1.455
= 1.746
Typ.
0.6000
0.6000
0.6000
0.04
1.500
1.800
0.04
Max.
 30
0.6120
0.6135
0.6150
0.4
1.545
1.854
0.4
Unit
nA
V
%/ V
V
%/ V
December,  20,  2009                                                        Techcode  Semiconductor  Limited                                                  www.techcodesemi.com 
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TD6811B 전자부품, 판매, 대치품
T  echcode®
 
 
 
1.5MHz 1.2A Synchronous Step-Down Regulator Dropout
Typical Operating Characteristics(Cont.) 
DATASHEET
TD6811B
RDS(ON) vs Input Voltage
 
Efficiency vs Output Current 
Efficiency vs Output Current
 
Efficiency vs Output Current 
 
December,  20,  2009                                                        Techcode  Semiconductor  Limited                                                  www.techcodesemi.com 
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