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AT1529 Dataheets PDF



Part Number AT1529
Manufacturers Global Mixed-mode Technology
Logo Global Mixed-mode Technology
Description 3.2A PWM Buck DC/DC Converter
Datasheet AT1529 DatasheetAT1529 Datasheet (PDF)

Global Mixed-mode Technology Inc. AT1529 1MHz, All-Ceramic, 3.2A PWM Buck DC/DC Converter Features „ Ceramic Input and Output Capacitors „ Efficiency Up to 94% „ Operate from 2.5V to 6V supply „ Adjustable Output from 0.8V to VIN „ Internal Soft-Start „ Short-Circuit and Thermal-Overload Protection „ Input Over Voltage Protection „ RoHS Compliant Applications „ ASIC/DSP/µP/FPGA Core and I/O Voltages „ Set-Top Boxes „ Cellular Base Stations „ Networking and Telecommunications General Descript.

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Global Mixed-mode Technology Inc. AT1529 1MHz, All-Ceramic, 3.2A PWM Buck DC/DC Converter Features „ Ceramic Input and Output Capacitors „ Efficiency Up to 94% „ Operate from 2.5V to 6V supply „ Adjustable Output from 0.8V to VIN „ Internal Soft-Start „ Short-Circuit and Thermal-Overload Protection „ Input Over Voltage Protection „ RoHS Compliant Applications „ ASIC/DSP/µP/FPGA Core and I/O Voltages „ Set-Top Boxes „ Cellular Base Stations „ Networking and Telecommunications General Description The AT1529 high-efficiency, DC/DC buck converter delivers up to 3.2A of output current. The device operates from an input voltage of 2.5V to 6V and provides an output voltage from 0.8V to VIN, making the AT1529 ideal for on-board post-regulation applications. The AT1529 operate at a fixed frequency of 1MHz with an efficiency of up to 94%. The high operating frequency minimizes the size of external components. Internal soft-start control circuitry reduces inrush current. Short-circuit and thermal-overload protections improve design reliability. The AT1529 are available in a space-saving SOP-8 and TDFN3X3-8 package. Ordering Information ORDER NUMBER MARKING AT1529F11U A1529 AT1529RD1U A1529 Note: F1:SOP-8 (FD) RD: TDFN3X3-8 1: Bonding Code U: Tape & Reel TEMP. RANGE -40°C to +85°C -40°C to +85°C PACKAGE (Green) SOP-8 (FD) TDFN3X3-8 Pin Configuration Typical Application Circuit VCC 1 REF 2 GND 3 FB 4 AT1529 Thermal Pad 8 VIN 7 LX 6 PGND 5 EN VCC 1 REF GND FB 2 3 4 AT1529 Thermal Pad 8 VIN 7 LX 6 PGND 5 EN SOP-8 (FD) TDFN3X3-8 Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. VIN 5V 10µF AT1529 8 VIN LX 7 10Ω 0.1µF 1 VCC 5 EN ON OFF PGND 6 4 FB REF 2 GND 0.1µF 3 VOUT = 0.8V × (1+ R1 R2 ) 2.2µH CFB* (option) R1 R2 50k 16k VOUT 3.3V 22µF Ver: 0.3 Nov 29, 2010 TEL: 886-3-5788833 http://www.gmt.com.tw 1 Global Mixed-mode Technology Inc. AT1529 Absolute Maximum Ratings VIN, VCC, REF to GND . . . . . . . . . . . . . . . -0.3V to +7V LX to PGND . . . . . . . . . . . . . . . . . . . .-1V to (VIN+1V) EN, FB to GND. . . . . . . . . . . . . . -0.3V to (VCC + 0.3V) VIN to VCC . . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V PGND to GND . . . . . . . . . . . . . . . . . . . .-0.3V to +0.3V Thermal Resistance Junction to Ambient, (θJA) * SOP-8 (FD) . . . . . . . . . . . . . . . . . . . . . . . . . .108°C/W TDFN3X3-8 . . . . . . . . . . . . . . . . . . . . . . . . . . .98°C/W Continuous Power Dissipation (TA = +25°C) * SOP-8 (FD). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2W TDFN3X3-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.4W Thermal Resistance Junction to Case, (θJC) SOP-8 (FD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12°C/W TDFN3X3-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . .30°C/W Operating Temperature Range . . . . . . . .-40°C to 85°C Maximum Junction Temperature. . . . . . . . . . . . .150°C Storage Temperature Range. . . . . . . . .-65°C to 165°C Reflow Temperature (soldeing,10 sec) . . . . . . . .260°C * Please refer to 1in2 of 1oz PCB Layout Section. Stress beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. Electrical Characteristics (VIN= VCC= 3.3V, PGND = GND, FB in regulation, CREF= 10nF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) PARAMETER IN Voltage Range Supply Current VCC Undervoltage Lockout Threshold REF Voltage EN Enable Threshold Output Voltage Range Output Voltage Line Regulation Output Voltage Load Regulation FB Regulation Voltage (Error Amp Only) FB Input Bias Current LX On-Resistance, PMOS LX On-Resistance, NMOS LX Current-Limit Threshold LX Leakage Current LX Switching Frequency LX Maximum Duty Cycle LX Minimum Duty Cycle Thermal-Shutdown Threshold Maximum Duty Cycle Minimum On Time CONDITION No switching (EN=VCC) Shutdown (EN=0V) VIN = 5V When LX starts/stops switching IREF = 0, VIN = 2.5V to 5V Logic High Logic Low When using external feedback resistors to drive FB VIN = 3V to 5V 0A


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