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TD6811 Dataheets PDF



Part Number TD6811
Manufacturers Techcode
Logo Techcode
Description 1.5MHz 1.2A Synchronous Step-Down Regulator Dropout
Datasheet TD6811 DatasheetTD6811 Datasheet (PDF)

T  echcode® DATASHEET       1.5MHz 1.2A Synchronous Step-Down Regulator Dropout TD6811 General Description  Features    The TD6811 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 TD6811 ideally suited for singl.

  TD6811   TD6811



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T  echcode® DATASHEET       1.5MHz 1.2A Synchronous Step-Down Regulator Dropout TD6811 General Description  Features    The TD6811 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 TD6811 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 TD6811 is available in TSOT23-5 package. z High Efficiency: Up to 96% z High Efficiency at light loads 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 TD6811  http://www.junyi-ic.com TEL:0755-29955070 FAX:0755-27858707 T  echcode® DATASHEET       1.5MHz 1.2A Synchronous Step-Down Regulator Dropout TD6811 Pin Assignments                                              TSOT23‐5  Pin Name Description 1 RUN Run Control Input. Forcing this pin above 1.5V enables the part. Forcing this pin below 0.3V shuts down the device. In shutdown, all functions are disabled drawing <1μA supply current. Do not leave RUN floating. 2 GND Ground Pin. 3 SW Switch Node Connection to Inductor. This pin connects to the   drains of the internal main and synchronous power MOSFET switches. 4 VIN Main Supply Pin. Must be closely decoupled to GND, Pin 2, with a 2.2μF or greater ceramic capacitor. 5 VFB Feedback Pin. Receives the feedback voltage from an external resistive divider across the output. 5 VOUT Output Voltage Feedback Pin. An internal resistive divider divides the output voltage down for comparison to the internal reference voltage. Ordering Information  TD6811    □ □    Circuit Type                                                                                                                            Output Versions Blank:Adj 12:1.2V Package 15:1.5V T:TSOT23-5 18:1.8V   http://www.junyi-ic.com TEL:0755-29955070 FAX:0755-27858707 T  echcode®       1.5MHz 1.2A Synchronous Step-Down Regulator Dropout Functional Block Diagram  DATASHEET TD6811 Figure2:Functional Block Diagram of TD6811  Type Application Circuit      Figure 3. Type Application Circuit of TD6811  http://www.junyi-ic.com TEL:0755-29955070 FAX:0755-27858707     T  echcode®       1.5MHz 1.2A Synchronous Step-Down Regulator Dropout Absolute Maximum Ratings  DATASHEET TD6811 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 Input Supply Voltage RUN, VFB Voltages SW Voltage P-Channel Switch Source Current (DC) N-Channel Switch Sink Current (DC) Peak SW Sink and Source Current Operating Temperature Range Junction Temperature Lead Temperature (Soldering, 10 sec) Storage Temperature Range Value -0.3 ~6 -0.3 ~ VIN -0.3V ~(VIN+0.3) 1500 1500 1.5 -40~+85 125 300 -65~150 Unit V V V mA mA A ºC ºC ºC ºC Electrical Characteristics  Unless otherwise specified, VIN= 3.6V TA=25 ºC.  Symbol IVFB VFB  VFB VOUT  VOUT Parameter Conditions Min. Feedback Current Regulated Feedback Voltage TA = 25°C 0°C TA ≤ 85°C –40°C ≤ TA ≤ 85°C 0.5880 0.5865 0.5850 Reference Voltage Line Regulation VIN = 2.5V to 5.5V Regulated Output Voltage TD6811-1.5, IOUT = 100mA 1.455 TD6811-1.8, IOUT = 100mA 1.746 Output Voltage Line Regulation VIN = 2.5V to 5.5V 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/% http://www.junyi-ic.com TEL:0755-29955070 FAX:0755-27858707 T  echcode® DATASHEET       1.5MHz 1.2A Synchronous Step-Dow.


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