td1529设计指导书.pdf

October, 20, 2010. Techcode Semiconductor Limited 1 T Techcodeechcode® 1.6A 32V Synchronous Rectified Step-Down Converte TD1529 DATASHEET General Description The TD1529 is a monolithic synchronous buck regulator. The device integrates two 130mΩ MOSFETs, and provides 1.6A of continuous load current over a wide input voltage of 4.75V to 32V. Current mode control provides fast transient response and cycle-by-cycle current limit. An adjustable soft-start prevents inrush current at turn-on, and in shutdown mode the supply current drops to 1µA. This device, available in an SOP8 package, provides a very compact solution with minimal external components. Features • 1.6A Output Current • Wide 4.75V to 32V Operating Input Range • Integrated 130mΩ Power MOSFET Switches • Output Adjustable from 0.923V to 30V • Up to 93% Efficiency • Programmable Soft-Start • Stable with Low ESR Ceramic Output Capacitors • Fixed 340KHz Frequency • Cycle-by-Cycle Over Current Protection • Input Under Voltage Lockout Applications • Distributed Power Systems • Networking Systems • FPGA, DSP, ASIC Power Supplies • Green Electronics/ Appliances •Notebook Computers Package Types Figure 1. Package Types of TD1529 泰德半导体--同创微电子 13418601901 409545144 October, 20, 2010. Techcode Semiconductor Limited 2 T Techcodeechcode® 1.6A 32V Synchronous Rectified Step-Down Converte TD1529 DATASHEET Pin Configurations Figure 2 Pin Configuration of TD1529(Top View) Pin Description Pin Number Pin Name Description 1 BS High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel MOSFET switch. Connect a 0.01µF or greater capacitor from SW to BS to power the high side switch. 2 IN Power Input. IN supplies the power to the IC, as well as the step-down converter switches. Drive IN with a 4.75V to 32V power source. Bypass IN to GND with a suitably large capacitor to eliminate noise on the input to the IC. See Input Capacitor. 3 SW Power Switching Output. SW is the switching node that supplies power to the output. Connect the output LC filter from SW to the output load. Note that a capacitor is required from SW to BS to power the high-side switch. 4 GND Ground. 5 FB Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a resistive voltage divider from the output voltage. The feedback threshold is 0.923V. See Setting the Output Voltage. 6 COMP Compensation Node. COMP is used to compensate the regulation control loop. Connect a series RC network from COMP to GND to compensate the regulation control loop. In some cases, an additional capacitor from COMP to GND is required. See Compensation Components. 7 EN Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the regulator, drive it low to turn it off. Pull up with 100kΩ resistor for automatic startup. 8 SS Soft-Start Control Input. SS controls the soft start period. Connect a capacitor from SS to GND to set the soft-start period. A 0.1µF capacitor sets the soft-start period to 15ms. To disable the soft-start feature, leave SS unconnected. October, 20, 2010. Techcode Semiconductor Limited 3 T Techcodeechcode® 1.6A 32V Synchronous Rectified Step-Down Converte TD1529 DATASHEET Ordering Information TD1529 □ □□ □ Circuit Type Packing: Blank：Tube R:Type and Reel Package P:SOP8 Function Block Figure 3 Function Block Diagram of TD1529 October, 20, 2010. Techcode Semiconductor Limited 4 T Techcodeechcode® 1.6A 32V Synchronous Rectified Step-Down Converte TD1529 DATASHEET Absolute Maximum Ratings Parameter Symbol Value Unit Supply Voltage VIN -0.3 to 32 V Switch Node Voltage VSW 30 V Boost Voltage VBS VSW – 0.3V to VSW+6VV Output Voltage VOUT 0.923V to 30 V All Other Pins –0.3V to +6V V Operating Junction Temperature TJ 150 ºC Storage Temperature TSTG -65 to 150 ºC Lead Temperature (Soldering, 10 sec) TLEAD 260 ºC ESD (HBM) 2000 V MSL Level3 Thermal Resistance-Junction to Ambient RθJA 90 ºC / W Thermal Resistance-Junction to Case RθJC 45 ºC / W October, 20, 2010. Techcode Semiconductor Limited 5 T Techcodeechcode® 1.6A 32V Synchronous Rectified Step-Down Converte TD1529 DATASHEET Electrical Characteristics VIN = 12V, Ta = 25℃ unless otherwise specified. Parameters Symbol Test Condition Min. Typ. Max. Unit Shutdown Supply Current VEN = 0V 1 3.0 µA Supply Current VEN = 2.0V; VFB = 1.0V 1.3 1.5 mA Feedback Voltage VFB 4.75V ≤ VIN ≤ 23V 0.9000.923 0.946V Feedback Overvoltage Threshold 1.1 V Error Amplifier Voltage Gain * AEA 400 V/V。